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| 1 | Research progress of novel adsorption processes in water purification: A review显示文摘作为为水纯化的一条有效、有效、经济的途径,吸附物和吸附过程广泛地很长时间在不同方面被学习了并且适用。在最近的年里,很多新奇吸附过程为提高把器官、无机的沾染物从水移开的效率被开发了。这篇文章考察一些新吸附物和专攻他们在水处理使用的作文,结构,功能,和特征的先进吸附方法。评论强调 adsorption/catalytic 氧化过程, adsorption/catalytic 减小过程,吸附结合了氧化还原过程,简历模仿的吸着剂和他们的水纯化效率。 | QU Jiuhui | 2008 | Journal of Environmental Sciences2008，20，1： | 31 |
| 2 | Removal characteristics of microplastics by Fe-based coagulants during drinking water treatment显示文摘Microplastics have caused great concern worldwide recently due to their ubiquitous presence within the marine environment. Up to now, most attention has been paid to their sources,distributions, measurement methods, and especially their eco-toxicological effects. With microplastics being increasingly detected in freshwater, it is urgently necessary to evaluate their behaviors during coagulation and ultrafiltration(UF) processes. Herein, the removal behavior of polyethylene(PE), which is easily suspended in water and is the main component of microplastics, was investigated with commonly used Fe-based salts. Results showed that although higher removal efficiency was induced for smaller PE particles, low PE removal efficiency(below 15%) was observed using the traditional coagulation process, and was little influenced by water characteristics. In comparison to solution pH, PAM addition played a more important role in increasing the removal efficiency, especially anionic PAM at high dosage(with efficiency up to 90.9%). The main reason was ascribed to the dense floc formation and high adsorption ability because of the positively charged Fe-based flocs under neutral conditions. For ultrafiltration, although PE particles could be completely rejected,slight membrane fouling was caused owing to their large particle size. The membrane flux decreased after coagulation; however, the membrane fouling was less severe than that induced by flocs alone due to the heterogeneous nature of the cake layer caused by PE, even at high dosages of Fe-based salts. Based on the behavior exhibited during coagulation and ultrafiltration, we believe these findings will have potential application in drinking water treatment. | Baiwen Ma Wenjing Xue Yanyan Ding Chengzhi Hu Huijuan Liu Jiuhui Qu | 2019 | Journal of Environmental Sciences2019，31，4： | 29 |
| 3 | The progress of catalytic technologies in water purification:A review显示文摘Catalytic technologies have been paid increasing attention in refractory pollutants abatement due to its practical and potential values in water purification.As effective and effcient approaches for water purification,Fenton's reagent,ozonation,electrochemical and photocatalytic methods have been widely studied and applied in different aspects and have been reviewed by several articles.In recent years,some novel catalytic processes based on above processes have been developed for enhancing the effciency of removing the organics from water.This review emphasized on the recent development of heterogeneous catalytic ozonation,electrocatalysis in respect of novel electrodes and electro-Fenton method,photoelectrocatalysis process and photoelectron-Fenton in water purification.It was also an attempt to propose general ideas about mechanism and principle enhancing the catalytic effciency for the degradation and the mineralization of organics in water. | LI Dapeng QU Jiuhui | 2009 | Journal of Environmental Sciences2009，21，6： | 22 |
| 4 | Shear wave velocity structure of the crust and upper mantle underneath the Tianshan orogenic belt显示文摘From April, 2003 to September, 2004, a passive broadband seismic array consisting of 60 stations was deployed over the Tianshan orogenic belt by State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration. Among them, 51 stations make up an about 500-km-long profile across the Tianshan Mountains from Kuytun to Kuqa. The receiver function profile and S-wave velocity structure of the crust and upper mantle down to 100 km deep are obtained by using the re-ceiver function method (Liu et al. 1996, 2000). The main results can be summarized as follows: (1) A clear mountain root does not exist beneath the Tianshan Mountains, and the crust-mantle boundaries underneath the stations mostly have transitional structures. This implies that the material differentia-tion between the crust and mantle is not yet accomplished and the orogenic process is still going on. (2) The crust beneath the Tianshan Mountains has laterally blocked structures in direction perpendicular to the mountain strike, and the crust-mantle boundary has a clear dislocation structure. Both of them correspond to each other. (3) The offsets of the Moho discontinuity are highly correlated to the tectonic borders on the surface and that corresponding to the frontal southern Tianshan fault reaches to 14 km. This manifests that large vertical divergent movement took place between different blocks. This sup-ports the discontinuous model of the Tianshan orogeny, and the Tarim block subduction is restricted only to the southern side of the South Tianshan. (4) Inside the upper and middle crust of the Tianshan Mountains exist several low-velocity bodies correlated with high seismicity located on the moun-tain-basin jointures on both sides of the mountain and between different blocks, and the low-velocity bodies on the mountain-basin jointures are inclined obviously to the mountain. This implies that the low-velocity bodies may be correlated closely to the thrust and subduction of the basins on both sides of the mountain, the splicing of adjacent blocks and the fast uplift of the Tianshan Mountains. | LI Yu LIU QiYuan CHEN JiuHui LI ShunCheng GUO Biao LAI YuanGen | 2007 | Science China Earth Sciences2007，50，3： | 16 |
| 5 | Municipal wastewater treatment in China:Development history and future perspectives显示文摘China has the world's largest and still growing wastewater sector and water market,thus its future development will have profound influence on the world.The high-speed development of China's wastewater sector over the past 40 years has forged its global leading treatment capacity and innovation ability.However,many problems were left behind,including underdeveloped sewers and sludge disposal facilities,low sustainability of the treatment processes,questionable wastewater treatment plant(WWTP)effluent discharge standards,and lacking global thinking on harmonious development between wastewater management,human society and the nature.Addressing these challenges calls for fundamental changes in target design,policy and technologies.In this mini-review,we revisit the development history of China's municipal wastewater management and identify the remaining challenges.Also,we highlight the future needs of sustainable development and exploring China's own wastewater management path,and outlook the future from several aspects including targets of wastewater management,policies and technologies,especially the new concept WWTP.Furthermore,we envisage the establishment of new-generation WWTPs with the vision of turning WWTP from a site of pollutant removal into a plant of energy,water and fertilizer recovery and an integrated part urban ecology in China. | Jiuhui Qu Hongchen Wang Kaijun Wang Gang Yu Bing Ke Han-Qing Yu Hongqiang Ren Xingcan Zheng Ji Li Wen-Wei Li Song Gao Hui Gong | 2019 | Frontiers of Environmental Science & Engineering2019，13，6： | 13 |
| 6 | Removal of tetracycline from water by Fe-Mn binary oxide显示文摘Significant concerns have been raised over the presence of antibiotics including tetracyclines in aquatic environments.A series of FeMn binary oxide with different Fe:Mn molar ratios was synthesized by a simultaneous oxidation and coprecipitation process for TC removal.Results showed that Fe-Mn binary oxide had higher removal efficiency than that of hydrous iron oxide and hydrous manganese oxide,and that the oxide with a Fe:Mn molar ratio of 5:1 was the best in removal than other molar ratios.The tetracycline removal was highly pH dependent.The removal of tetracycline decreased with the increase of initial concentration,but the absolute removal quantity was more at high concentration.The presence of cations and anions such as Ca2+,Mg2+,CO32-and SO42-had no significant effect on the tetracycline removal in our experimental conditions,while SiO32-and PO43-had hindered the adsorption of tetracycline.The mechanism investigation found that tetracycline removal was mainly achieved by the replacement of surface hydroxyl groups by the tetracycline species and formation of surface complexes at the water/oxide interface.This primary study suggests that Fe-Mn binary oxide with a proper Fe:Mn molar ratio will be a very promising material for the removal of tetracycline from aqueous solutions. | Huijuan Liu Yang Yang Jin Kang Maohong Fan Jiuhui Qu | 2012 | Journal of Environmental Sciences2012，24，2： | 13 |
| 7 | Characterization of dissolved organic matter fractions and its relationship with the disinfection by-product formation显示文摘Dissolved organic matter(DOM) has been identified as precursor for disinfection by-products(DBPs) formation during chlorination. Recently,it has been demonstrated that the characteristics of DOM influence the DBPs formation mechanism. A study was,therefore,initiated to investigate the effects of DOM fractions on DBPs formation mechanism. In the chlorination process,organic acids are dominant precursors of total thihalomethanes(TTHM) because of the νC-O and unsaturated structures. Furthermore,the TTHM formation of organic acids was affected by pH more greatly. Based on the fluorescence spectroscopy analysis,DOM fractions contained several fluorescence substances. During chlorination,humic acid-like substances were found to exhibit high chlorine reactivity and hydrophobic organics decomposed to smaller molecules faster than hydrophilic organics even at lower chlorine dosages. Unlike hydrophobic fractions,hydrophilic organics showed no toxicity following chlorination,suggesting that the toxic structures in hydrophilic organics showed high chlorine reactivity during chlorination. | ZHANG Hua QU Jiuhui LIU Huijuan WEI Dongbin | 2009 | Journal of Environmental Sciences2009，21，1： | 12 |
| 8 | Antimony oxidation and adsorption by in-situ formed biogenic Mn oxide and Fe–Mn oxides显示文摘Antimony(Sb), which can be toxic at relatively low concentrations, may co-exist with Mn(Ⅱ)and/or Fe(Ⅱ) in some groundwater and surface water bodies. Here we investigated the potential oxidation and adsorption pathways of Sb(Ⅲ and V) species in the presence of Mn(Ⅱ) and Mn-oxidizing bacteria, with or without Fe(Ⅱ). Batch experiments were conducted to determine the oxidation and adsorption characteristics of Sb species in the presence of biogenic Mn oxides(BMOs), which were formed in-situ via the oxidation of Mn(Ⅱ) by a Mn-oxidizing bacterium(Pseudomonas sp. QJX-1). Results indicated that Sb(Ⅲ) ions could be oxidized to Sb(V) ions by BMO, but only Sb(V) originating from Sb(Ⅲ) oxidation was adsorbed effectively by BMO. Introduced Fe(Ⅱ) was chemically oxidized to Fe OOH, the precipitates of which mixed with BMO to form a new compound, biogenic Fe–Mn oxides(BFMO). The BMO part of the BFMO mainly oxidized and the Fe OOH of the BFMO mainly adsorbed the Sb species. In aquatic solutions containing both As(Ⅲ) and Sb(Ⅲ), the BFMO that formed in-situ preferentially oxidized Sb over As but adsorbed As more efficiently. Chemical analysis and reverse transcription real-time polymerase chain reaction revealed that the presence of Fe(Ⅱ), As(Ⅲ) and Sb(Ⅲ) accelerated the oxidation of Mn(Ⅱ) but inhibited the activity of Mn-oxidizing bacteria. These results provide significant insights into the biogeochemical pathways of Sb, Mn(Ⅱ) in aquatic ecosystems, with or without Fe(Ⅱ). | Yaohui Bai William A.Jefferson Jinsong Liang Tingting Yang Jiuhui Qu | 2017 | Journal of Environmental Sciences2017，29，4： | 12 |
| 9 | Practical performance and its efficiency of arsenic removal from groundwater using Fe-Mn binary oxide显示文摘A treatment unit packed by granular adsorbent of Fe-Mn binary oxide incorporated into diatomite (FMBO(1:1)-diatomite) was studied to remove arsenic from anaerobic groundwater without any pre-treatment or post-treatment. The raw anaerobic groundwater containing 35-45 μg/L of arsenic was collected from suburb of Beijing. Arsenic(III) constituted roughly 60%-80% of the total arsenic content. Approximately 7,000 bed volumes (ratio of efluent volume to adsorbent volume) treated water with arsenic concentration below 10 μg/L were produced in the operation period of four months. The regeneration of FMBO(1:1)-diatomite had been operated for 15 times. In the first stage, the regeneration process significantly improved the adsorption capacity of FMBO(1:1)-diatomite. With increased loading amount of Fe-Mn binary oxide, the adsorption capacity for arsenic decreased 20%-40%. Iron and manganese in anaerobic groundwater were oxidized and adsorptive filtrated by FMBO(1:1)-diatomite efficiently. The final concentrations of iron and manganese in efluents were nearly zero. The continued safe performance of the treatment units proved that adsorbent FMBO(1:1)-diatomite had high oxidation ability and exhibited strong adsorptive filtration. | Fangfang Chang Jiuhui Qu Ruiping Liu Xu Zhao Pengju Lei | 2010 | Journal of Environmental Sciences2010，22，1： | 11 |
| 10 | Preparation of organically functionalized silica gel as adsorbent for copper ion adsorption显示文摘A novel adsorbent (AMPS-silica) was synthesized by bounding AMPS (2-acrylamido-2-methylpropanesulfonic acid) onto silica surface, which functioned with γ-methacryloxypropyltrimethoxysilane reagent. The adsorbent was characterized by nitrogen adsorption/desorption measurement, thermogravimetric analysis (TGA) and potentiometric titration analysis. The TGA result indicated that the surface modification reactions introduced some organic functional groups onto the surface of silica. The surface area of AMPSsilica was 389.7 m2/g. The adsorbent was examined for copper ion removal in series of batch adsorption experiments. Results showed that the adsorption of Cu2+ onto AMPS-silica was pH dependent, and the adsorption capacity increased with increasing pH from 2 to 6. The adsorption kinetics showed that Cu2+ adsorption was fast and the data fitted well with a pseudo secondorder kinetic model. The adsorption of Cu2+ onto AMPS-silica obeyed both Freundlich and Langmuir isotherms, with r2 = 0.993 and r2 = 0.984, respectively. The maximum Cu2+ adsorption capacity was 19.9 mg/g. The involved mechanism might be the adsorption through metal binding with organic functional groups such as carboxyl, amino and sulfonic groups. Cu2+ loaded on AMPS-silica could be desorbed in HNO3 solution, and the adsorption properties remain stable after three adsorption-desorption cycles. | WANG Hongjie KANG Jin LIU Huijuan QU Jiuhui | 2009 | Journal of Environmental Sciences2009，21，11： | 9 |
| 11 | Effects of protein properties on ultrafiltration membrane fouling performance in water treatment显示文摘Protein-like substances always induce severe ultrafiltration(UF) membrane fouling. To systematically understand the effect of proteins, regenerated cellulose UF membrane(commonly used for protein separation) performance was investigated in the presence of bovine serum albumin(BSA) under various water conditions. Results showed that although trypsin enhanced the membrane flux via proteolysis, catalysis took a long time. Membrane fouling was alleviated at high solution p H and low water temperature owing to the strong electrostatic repulsion force among BSA molecules. Both Na^+ and Ca^(2+)could increase membrane flux. However, Ca^(2+)played a bridging role between adjacent BSA molecules,whereas membrane fouling was alleviated via a hydration repulsion force with Na+. The order of influence on membrane fouling was as follows: Ca^(2+)concentration > Na+concentration > pH > temperature > trypsin concentration. Furthermore, a polyvinylidene fluoride UF membrane experiment showed that Ca^(2+)could reduce the fouling induced by BSA. Thus, the differences in UF membrane performance will have application potential for alleviating UF membrane fouling induced by proteins during water treatment. | Yanyan Ding Baiwen Ma Huijuan Liu Jiuhui Qu | 2019 | Journal of Environmental Sciences2019，31，3： | 9 |
| 12 | Adsorption behavior of sulfamethazine in an activated sludge process treating swine wastewater显示文摘Swine wastewater is an important pollution source of antibiotics entering the aquatic environment. In this work,the adsorption behavior of sulfamethazine(SMN),a commonlyused sulfonamide antibiotic,on activated sludge from a sequencing batch reactor treating swine wastewater was investigated. The results show that the adsorption of SMN on activated sludge was an initially rapid process and reached equilibrium after 6 hr. The removal efficiency of SMN from the water phase increased with an increasing concentration of mixed liquor suspended solids,while the adsorbed concentration of SMN decreased. Solution pH influenced both the speciation of SMN and the surface properties of activated sludge,thus significantly impacting the adsorption process. A linear partition model could give a good fit for the equilibrium concentrations of SMN at the test temperatures(i.e.,10,20 and 30°C). The partition coefficient(Kd) was determined to be 100.5 L/kg at 20°C,indicating a quite high adsorption capacity for SMN. Thermodynamic analysis revealed that SMN adsorption on activated sludge was an exothermic process. This study could help to clarify the fate and behavior of sulfonamide antibiotics in the activated sludge process and assess consequent environmental risks arising from sludge disposal as well. | Weiwei Ben Zhimin Qiang Xiaowei Yin Jiuhui Qu Xun Pan | 2014 | Journal of Environmental Sciences2014，26，8： | 9 |
| 13 | Comparison of the effects of aluminum and iron(Ⅲ)salts on ultrafiltration membrane biofouling in drinking water treatment显示文摘Coagulation plays an important role in alleviating membrane fouling, and a noticeable problem is the development of microorganisms after long-time operation, which gradually secrete extracellular polymeric substances(EPS). To date, few studies have paid attention to the behavior of microorganisms in drinking water treatment with ultrafiltration(UF)membranes. Herein, the membrane biofouling was investigated with different aluminum and iron salts. We found that Al_2(SO_4)_3·18 H_2O performed better in reducing membrane fouling due to the slower growth rate of microorganisms. In comparison to Al_2(SO_4)_3·18H_2O,more EPS were induced with Fe_2(SO_4)_3·x18H_2O, both in the membrane tank and the sludge on the cake layer. We also found that bacteria were the major microorganisms, of which the concentration was much higher than those of fungi and archaea. Further analyses showed that Proteobacteria was dominant in bacterial communities, which caused severe membrane fouling by forming a biofilm, especially for Fe_2(SO_4)_3·x18H_2O. Additionally, the abundances of Bacteroidetes and Verrucomicrobia were relatively higher in the presence of Al_2(SO_4)_3·18 H_2O,resulting in less severe biofouling by effectively degrading the protein and polysaccharide in EPS. As a result, in terms of microorganism behaviors, Al-based salts should be given preference as coagulants during actual operations. | Xing Wang Baiwen Ma Yaohui Bai Huachun Lan Huijuan Liu Jiuhui Qu | 2018 | Journal of Environmental Sciences2018，30，1： | 8 |
| 14 | Synthesis, nematicidal activity and docking study of novel chromone derivatives containing substituted pyrazole显示文摘A series of chromone derivatives containing substituted pyrazole were designed and synthesized.Preliminary bioassays showed that most of the synthesized compounds exhibited good nematicidal activity in vivo against Meloidogyne incognita at 10 mg/L. Among the tested compounds, A10 and A11 exhibited 100% inhibition rates. In addition, the molecular docking results indicated that both compound A10 and A11 interacts with amino acid residue Tyr121, Trp279, Tyr70, Trp84 and Phe330 of ACh E via hydrogen bond and p–p stacking. This investigation suggested that the chromone containing substituted pyrazole scaffold could be further optimized to explore novel, high-bioactivity nematicidal leads. | Wei Li Jiuhui Li Hongfeng Shen Jiagao Cheng Zhong Li Xiaoyong Xu | 2018 | Chinese Chemical Letters2018，29，6： | 7 |
| 15 | Characterization and reactivity of biogenic manganese oxides for ciprofloxacin oxidation显示文摘Biogenic manganese oxides(BioMnOx) were synthesized by the oxidation of Mn(II) with Mnoxidizing bacteria Pseudomonas sp. G7 under different initial pH values and Mn(II) dosages, and were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and UV-Vis absorption spectroscopy. The crystal structure and Mn oxidation states of BioMnOx depended on the initial pH and Mn(II) dosages of the medium. The superoxide radical(O.-2) was observed in Mn-containing(III/IV) BioMnOxsuspensions by electron spin resonance measurements. BioMnOx(0.4)-7, with mixed valence of Mn(II/III/IV) and the strongest O.-2signals, was prepared in the initial pH 7 and Mn(II) dosage of 0.4 mmol/L condition, and exhibited the highest activity for ciprofloxacin degradation and no Mn(II) release. During the degradation of ciprofloxacin, the oxidation of the Mn(II) formed came from biotic and abiotic reactions in BioMnOx suspensions on the basis of the Mn(II) release and O.-2formation from different BioMnOx. The degradation process of ciprofloxacin was shown to involve the cleavage of the hexatomic ring having a secondary amine and carbon-carbon double bond connected to a carboxyl group, producing several compounds containing amine groups as well as small organic acids. | Jinjun Tu Zhendong Yang Chun Hu Jiuhui Qu | 2014 | Journal of Environmental Sciences2014，26，5： | 7 |
| 16 | Hydrotalcite-supported Pd-Cu catalyst for nitrate adsorption and reduction from water显示文摘Hydrotalcite-supported Pd-Cu catalyst for nitrate adsorption and catalytic reduction from water is prepared by co-impregnation method and characterized by surface area (BET), X-ray diffraction (XRD), scanning electron microscope (SEM), trans- mission electron microscope (TEM) and X-ray pho- toelectron spectrum (XPS). The performance of ad- sorption and hydrogenation of nitrate was evaluated and compared with Al2O3, TiO2, and HZSM-supported Pd-Cu catalysts. The experimental results demon- strated that hydrotalcite-supported Pd-Cu catalyst exhibited a high surface area (185.3 m2/g) and mesopore structure (average pore diameter of 52.2 ?). The active metal clusters were homogeneously dispersed on the support, and the size of the most was less than 10 nm. Excellent adsorption for nitrate resulted from that nitrate ions were forced to enter the interlayer space when the calcined hydrotalcite re- generated layer structure in nitrate solution. The ad- sorption isotherm could be well described by the Langmuir model. The comparison between the ad- sorption and catalytic hydrogenation for nitrate using hydrogen indicated that nitrate reduction on hydro- talcite-supported Pd-Cu catalysts was a consecutive and dynamic adsorption and catalytic hydrogenation process. Compared with the Al2O3, TiO2, and HZSM- supported catalysts, hydrotalcite-supported Pd-Cu catalyst possessed higher catalytic activity and se- lectivity. The analysis on the dissolving of metals in the solution demonstrated that there was hydrolyza-tion on the surface of the hydrotalcite-supported Pd-Cu catalyst. However, the concentrations of dis- solved metals in the solution were lower than the standard executed in China. The activity of the hy- drotalcite-supported Pd-Cu catalyst for nitrate reduc- tion kept steady after repeated use. | WANG Ying QU Jiuhui LIU Huijuan WU Rongcheng | 2006 | Chinese Science Bulletin2006，51，12： | 7 |
| 17 | Proportion of bromo-DBPs in total DBPs during reclaimed-water chlorination and its related influencing factors显示文摘During the chlorine disinfection of reclaimed-water, the proportion of bromo-disinfection by-products (bromo-DBPs) in total DBPs is affected by chlorine dosage, reaction time, pH, ammonia nitrogen (NH3-N) and preozonation. Results show that bromo-trihalomethanes (bromo-THMs) form more easily than bromo-haloacetic acids (bromo-HAAs) and bromine incorporation in DBPs decreases with the increase of chlorine dosage. Within 5 h, bromine incorporation in THMs (n(Br)) increases but bromine incorpo-ration in HAAs (n′(Br)) decreases with the extension of reaction time; however, n(Br) decreases and n′(Br) keeps relatively constant at a longer reaction time. Furthermore, bromine incorporation in DBPs is low under acidic and alkaline conditions. The increase of NH3-N concentration inhibits the formation of chloro-DBPs, resulting in the increase of n(Br) and n′(Br) to some extent. Preozonation enhances the formation of HOBr and the increase of bromine incorporation in DBPs; however, ozone of a high con-centration oxidizes HOBr to its salt form, leading to the decrease of bromine incorporation in DBPs. | Hua Zhang JiuHui Qu HuiJuan Liu Xu Zhao | 2008 | Science China Chemistry2008，51，10： | 7 |
| 18 | Development and application of innovative technologies for drinking water quality assurance in China显示文摘The continuously deteriorating quality of source water is threatening the safety of drinking water in China.Various efforts have been made to update water treatment processes to decrease the pollution problems of drinking water,such as protection of drinking water sources,enhance-ment of conventional treatment processes,and development of new or advanced treatment technologies.This paper reviews a variety of protection and remediation methods for drinking water sources,development and application of drinking water treatment technologies,new technologies for special pollutants removal from groundwater,and the latest research progress on water distribution systems in China. | QU Jiuhui YIN Chengqing YANG Min LIU Huijuan | 2007 | Frontiers of Environmental Science & Engineering2007，1，3： | 7 |
| 19 | Formation and distribution of disinfection by-products during chlorine disinfection in the presence of bromide ion显示文摘The influences of contact time and pH value on the formation and distribution of four species of trihalomethanes and five species of haloacetic acids during chlorination in the presence of bromine were investigated. Results showed that the distribution of molar fraction of trihalomethanes varied with contact time due to the change of bromide ion concentration during chlorination. Most of the trihalomethanes comprising bromine-containing species and the favored products of the haloacetic acids were chlorine-containing species after 24 h of chlorination. The extent of bromine incorporation in trihalomethanes and haloacetic acids both decreased with time. The contact time also had influence on the formation rate of different species of haloacetic acids. The formation and distribution of trihalomethanes and haloacetic acids strongly depended on the chlorination pH value. All of the trihalomethanes species formation increased with the increase of pH value except the bromoform that had not been detected. The molar fraction of bromodichloromethane and dibromochloromethane containing bromine increased with pH value while chloroform without bromine decreased. Under the pH range studied in this experiment, the predominant haloacetic acids species were trichloroacetic acid and dichloroacetic acid which all decreased with the increase of pH value and the level of TCAA was higher than that of DCAA. | LI Bo QU JiuHui LIU HuiJuan ZHAO Xu | 2008 | Chinese Science Bulletin2008，53，17： | 7 |
| 20 | Removal of bentazone from micro-polluted water using MIEX resin:Kinetics,equilibrium,and mechanism显示文摘The contamination of surface and ground water by bentazone has attracted increasing global concern in recent years.We conducted a detailed investigation using MIEX resin to eliminate bentazone from waters.Batch experiments were carried out to evaluate the effect of process parameters,such as retention time,resin amount,and initial pesticide concentration,on removal efficiency of bentazone.Results showed the sorption process was fast and bentazone could be efficiently removed in 30 minutes.The kinetic process of bentazone sorption on MIEX resin was well described by pseudo second-order model and intraparticle diffusion was the rate controlling step.The MIEX resin possessed the highest sorption capacity of 0.2656 mmol/mL for bentazone according to Langmuir fitting.Bentazone is a hydrophobic ionizable organic compound,and both ionic charge and hydrophobic aromatic structure governed the sorption characteristics on MIEX resin.The different removal efficiencies of ionic and non-ionic pesticides,combined with the charge balance equations of bentazone,SO 4 2,NO 3 and Cl,indicated that removal of bentazone using MIEX resin occurred primarily via ion exchange. | Zequn Liu Xiaomin Yan Mary Drikas Danong Zhou DongshengWang Min Yang Jiuhui Qu | 2011 | Journal of Environmental Sciences2011，23，3： | 6 |
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