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| 1 | Fractal analysis of polyferric chloride-humic acid(PFC-HA) flocs in different topological spaces显示文摘The fractal dimensions in different topological spaces of polyferric chloride-humic acid(PFC-HA) flocs,formed in flocculating different kinds of humic acids(HA) water at different initial pH(9.0,7.0,5.0) and PFC dosages,were calculated by effective densitymaximum diameter,image analysis,and N2 absorption-desorption methods,respectively. The mass fractal dimensions(Df) of PFC-HA flocs were calculated by bi-logarithm relation of effective density with maximum diameter and Logan empirical equation. The Df value was more than 2.0 at initial pH of 7.0,which was 11% and 13% higher than those at pH 9.0 and 5.0,respecively,indicating the most compact flocs formed in flocculated HA water at initial pH of 7.0. The image analysis for those flocs indicates that after flocculating the HA water at initial pH greater than 7.0 with PFC flocculant,the fractal dimensions of D2(logA vs. logdL) and D3(logVsphere vs. logdL) of PFC-HA flocs decreased with the increase of PFC dosages,and PFC-HA flocs showed a gradually looser structure. At the optimum dosage of PFC,the D2(logA vs. logdL) values of the flocs show 14%-43% difference with their corresponding Df,and they even had different tendency with the change of initial pH values. However,the D2 values of the flocs formed at three different initial pH in HA solution had a same tendency with the corresponding Df. Based on fractal Frenkel-Halsey-Hill(FHH) adsorption and desorption equations,the pore surface fractal dimensions(Ds) for dried powders of PFC-HA flocs formed in HA water with initial pH 9.0 and 7.0 were all close to 2.9421,and the Ds values of flocs formed at initial pH 5.0 were less than 2.3746. It indicated that the pore surface fractal dimensions of PFC-HA flocs dried powder mainly show the irregularity from the mesopore-size distribution and marcopore-size distribution. | WANG Yili LU Jia DU Baiyu SHI Baoyou WANG Dongsheng | 2009 | Journal of Environmental Sciences2009，21，1： | 9 |
| 2 | Adsorption of atrazine by natural organic matter and surfactant dispersed carbon nanotubes显示文摘The aggregation and dispersion behaviors of carbon nanotubes (CNTs) can regulate the environmental spread and fate of CNTs, as well as the organic pollutants adsorbed onto them. In this study, multi-walled carbon nanotubes (MWNTs) and single-walled carbon nanotubes (SWNTs) were surface modified with humic acids from different sources and with surfactants of different ionic types. The dispersion stability of surface modified CNTs was observed by UV-Vis spectrophotometry. The effect of humic acid and surfactant dispersion on the adsorption of atrazine by CNTs was investigated by batch equilibrium experiments. Both humic acid and surfactant could effectively disperse MWNTs, but not SWNTs, into stable suspensions under the studied conditions. Surface modified CNTs had a greatly reduced capacity for adsorption of atrazine. The inhibitory effect of peat humic acid was relatively stronger than that of soil humic acid, but the two surfactants had a similar inhibitory effect on atrazine adsorption by the two CNT types. Increases in surfactant concentration resulted in rapid decreases in the adsorption of atrazine by CNTs when the surfactant concentration was less than 0.5 critical micelle concentration. | Baoyou Shi, Xiaoyan Zhuang, Xiaomin Yan, Jiajuan Lu, Hongxiao Tang State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. | 2010 | Journal of Environmental Sciences2010，22，8： | 7 |
| 3 | In vivo toxicity of nano-C_60 aggregates complex with atrazine to aquatic organisms显示文摘The present study aims at investigating the potential impacts of the nC60 complex with atrazine on the development of Japanese medaka (Oryzias latipes) embryos and chronic toxicity to D. magna. Although exposure to nC60 below 8 mg/L had no effects on the hatching rate of medaka embryos, it increased the deformity of hatched larvae. Moreover, the presence of nC60 significantly increased the hatching time of the embryos exposed to atrazine. 14-day exposure of D. magna to nC60 significantly reduced offspring production even at a concentration as low as 0.5 mg/L. This indicates that nC60 is able to reduce the ability of D. magna to produce offspring, and therefore would have an impact on population. For atrazine, no significant difference in offspring production was observed. The nC60 complex with atrazine was also found to significantly decrease the reproduction of D. magna, which was similar to the result of exposure to nC60. These results suggest that nC60 would have potential risks to aquatic organisms. Therefore, much attention should be paid to their associations with other contaminants for fullerene's risk assessment. | YAN XiaoMin ZHA JinMiao SHI BaoYou WANG DongSheng WANG ZiJian TANG HongXiao | 2010 | Chinese Science Bulletin2010，55，4： | 5 |
| 4 | Deposition behavior of residual aluminum in drinking water distribution system:Effect of aluminum speciation显示文摘Finished drinking water usually contains some residual aluminum.The deposition of residual aluminum in distribution systems and potential release back to the drinking water could significantly influence the water quality at consumer taps.A preliminary analysis of aluminum content in cast iron pipe corrosion scales and loose deposits demonstrated that aluminum deposition on distribution pipe surfaces could be excessive for water treated by aluminum coagulants including polyaluminum chloride(PACl).In this work,the deposition features of different aluminum species in PACl were investigated by simulated coil-pipe test,batch reactor test and quartz crystal microbalance with dissipation monitoring.The deposition amount of non-polymeric aluminum species was the least,and its deposition layer was soft and hydrated,which indicated the possible formation of amorphous Al(OH)_3.Al_(13) had the highest deposition tendency,and the deposition layer was rigid and much less hydrated,which indicated that the deposited aluminum might possess regular structure and self-aggregation of Al_(13)could be the main deposition mechanism.While for Al_(30),its deposition was relatively slower and deposited aluminum amount was relatively less compared with Al_(13).However,the total deposited mass of Al_(30) was much higher than that of Al_(13),which was attributed to the deposition of particulate aluminum matters with much higher hydration state.Compared with stationary condition,stirring could significantly enhance the deposition process,while the effect of pH on deposition was relatively weak in the near neutral range of 6.7 to 8.7. | Yue Zhang Baoyou Shi Yuanyuan Zhao Mingquan Yan Darren A.Lytle Dongsheng Wang | 2016 | Journal of Environmental Sciences2016，28，4： | 5 |
| 5 | Dye removal by eco-friendly physically cross-linked double network polymer hydrogel beads and their functionalized composites显示文摘Hydrogels have attracted large attention in wastewater treatment fields due to their low-cost and good interaction with pollutants,among which novel double network hydrogel is an outstanding class.To expand the application of double network hydrogel in water treatment,in this study,eco-friendly physically cross-linked double network polymer hydrogel beads(DAP)are prepared and studied in depth on the mechanism of Methylene Blue(MB)adsorption;and then the polymer hydrogels are further functionalized by inorganic materials.MB adsorption on DAP favors alkaline condition which is due to the increase of electrostatic attraction and adsorption site,and it reaches equilibrium within 10 hr,which is faster than that of the single network hydrogel beads(SAP).Through thermodynamics study,the process shows to be an exothermic and spontaneous process.The adsorption isotherms are well fitted by Langmuir model,with a maximum monolayer adsorption capacity of 1437.48 mg/g,which is larger than SAP(1255.75 mg/g).After being functionalized with common inorganic materials including activated carbon,Fe_3O_4and graphene oxide(GO),the composites show to have larger pore sizes and have obvious increases in adsorption capacity especially the one contains GO.Then the composites contains Fe_3O_4are used as heterogeneous Fenton catalyst which shows to have excellent performance in MB degradation.The results indicate the potential of polymer double network to be functionalized in environmental areas. | Yan Kong Yuan Zhuang Zhiyong Han Jianwei Yu Baoyou Shi Kun Han Haotian Hao | 2019 | Journal of Environmental Sciences2019，31，4： | 5 |
| 6 | Strong enhancement of methylene blue removal from binary wastewater by in-situ ferrite process显示文摘Dye wastewater containing heavy metal ions is a common industrial effluent with complex physicochemical properties.The treatment of metal–dye binary wastewater is difficult.In this work,a novel in-situ ferrite process(IFP) was applied to treat Methylene Blue(MB)–Cu(II)binary wastewater,and the operational parameters were optimized for MB removal.Results showed that the optimum operating conditions were OH/M of 1.72,Cu^(2+)/Fe^(2+)ratio of 1/2.5,reaction time of 90 min,aeration intensity of 320 mL/min,and reaction temperature of40°C.Moreover,the presence of Ca^(2+)and Mg^(2+)moderately influenced the MB removal.Physical characterization results indicated that the precipitates yielded in IFP presented high surface area(232.50 m2/g) and a multi-porous structure.Based on the Langmuir model,the maximum adsorption capacity toward MB was 347.82 mg/g for the precipitates produced in IFP,which outperformed most other adsorbents.Furthermore,IFP rapidly sequestered MB with removal efficiency 5 to 10 times greater than that by general ferrite adsorption,which suggested a strong enhancement of MB removal by IFP.The MB removal process by IFP showed two different high removal stages,each with a corresponding removal mechanism.In the first brief stage(<5 min),the initial high MB removal(~95%)was achieved by predominantly electrostatic interactions.Then the sweep effect and encapsulation were dominant in the second longer stage. | Haotian Hao Yili Wang Baoyou Shi Kun Han Yuan Zhuang Yan Kong Xin Huang | 2018 | Journal of Environmental Sciences2018，30，11： | 3 |
| 7 | Polymer hydrogels with enhanced stability and heterogeneous Fenton activity in organic pollutant removal显示文摘Polymer hydrogel-based materials have been shown to act as novel Fenton catalysts for water treatment,but the rational design of hydrogel-based catalysts with good stability has been a great challenge.To increase the stability and activity of polymer-based Fenton catalysts,uniform urchin-like α-Fe2O3 was grown in situ in a PVA carrier matrix here.PVA molecules promoted the growth of urchin-like α-Fe2O3,and then the PVA hydrogel acted as a barrier and carrier to reduce agglomeration.Through coordination by hydroxyl groups,PVA had good combination with Fe ions and α-Fe2O3.The formation of Fe-O-C bonds between iron oxides and polymers was reported for the first time,enhancing the material stability during catalysis.Under higher PVA concentrations,the resulting composite hydrogel could generate more OH due to the increase in the number of active sites because of the hairy urchin-like structure.In tetracycline degradation through a heterogeneous Fenton reaction,the resulting material had good catalytic activity from pH 2 to pH 10 with low iron leaching,good reusability and remained at a level of nearly 90% after five consecutive cycles.Density functional theory calculations were used to further prove the mechanism of structural change of the iron oxides.The HOMO and LUMO energies of the iron oxides changed from 5.428 and 4.899 eV to 5.926 and 5.310 eV,indicating that the presence of PVA could influence the charge of the iron atom.The results provide new insights into the preparation of polymer hydrogel-based heterogeneous Fenton catalysts with enhanced stability for water treatment. | Yuan Zhuang Baoyou Shi | 2019 | Journal of Environmental Sciences2019，31，11： | 2 |
| 8 | Bacterial community of biofilms developed under different water supply conditions in a distribution system 显示文摘 | SUN Huifang SHI Baoyou BAI Yaohui | 2013 | Science of the Total Environment2013，472，： | 1 |
| 9 | Effect of pre-ozonation on optimized coagulation of a typical North China source water显示文摘 | YAN Mingquan WANG Dongsheng SHI Baoyou | 2007 | Chemosphere2007，69，11： | 1 |
| 10 | Alkalinity effect of coagulation with poly aluminum chlorides: role of electrostatic patch 显示文摘 | Ye Changqing Dongsheng Wang Baoyou Shi et ol | 2007 | Colloids and Surfaces A: Physicochemical and Engineering Aspects2007，294，13： | 1 |
| 11 | Removal of direct dyes by coagulation: the performance of preformed polymeric aluminum species显示文摘 | SHI Baoyou LI Guohong WANG Dongsheng | 2007 | Journal of Hazardous Materials2007，43，56： | 1 |
| 12 | Potential impact of enhanced coagu-lation on corrosion by-product release in a distribution system显示文摘 | Shi Baoyou Taylor S James | 2007 | Elsevier B V2007，37，8： | 1 |
| 13 | Removal of direct dyes by coagulation : The performance of preformed polymeric aluminum species显示文摘 | Shi Baoyou Li Guohong Wang Dongsheng | 2007 | Journal of Hazardous Materials2007，143，12： | 1 |
| 14 | Effect of Pre-ozonation on Optimized Coagulation of a Typical North-China Source Water显示文摘 | Mingquan Yan Dongsheng Wang Baoyou Shi Min Wang You Yan | 2007 | Chemosphere2007，，11： | 1 |
| 15 | Characteristics of simplified ferron colorimetric solution and its application in hydroxy-aluminum speciation显示文摘 | Feng Chenghong Shi Baoyou Wang Dongsheng | | 0，，： | 1 |
| 16 | Removal of direct dyes by coagulation: The performance of preformed polymeric aluminum species显示文摘 | Baoyou Shi Guohong Li Dongsheng Wang Chenghong Feng Hongxiao Tang | 2006 | Journal of Hazardous Materials2006，，1： | 1 |
| 17 | Alkalinity effect of coagulation with polyaluminum chlorides: role of electrostatic patch 显示文摘 | YE Changqing WANG Dongsheng SHI Baoyou | 2007 | Colloids and Surfaces A : Physicochemical and Engineering Aspects2007，294，1： | 1 |
| 18 | Separation of Al13 from polyaluminum chloride by sulfate precipitation and nitrate metathesis显示文摘 | Baoyou Shi Guohong Li Dongsheng Wang | 2007 | Separation and Purification Technology2007，54，： | 1 |
| 19 | Formation and transformation of Al13 from freshly formed precipitate in partially neutralized Al(III) solution显示文摘 | Changqing Ye Dongsheng Wang Baoyou Shi Xiaopeng Ge Jiuhui Qu | 2007 | Journal of Sol - Gel Science and Technology2007，，3： | 1 |
| 20 | Separa tion of Al13 from polyaluminum chloride by sulfate precipitation and nitrate metathesis显示文摘 | Baoyou Shi Guohong Li Dongsheng Wang | 2007 | Separation and Purification Technology2007，54，1： | 1 |
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