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| 1 | Pb(Ⅱ) biosorption using chitosan and chitosan derivatives beads: Equilibrium, ion exchange and mechanism studies显示文摘The study examined the adsorption of Pb(II) ions from aqueous solution onto chitosan, chitosan-GLA and chitosan-alginate beads. Several important parameters influencing the adsorption of Pb(II) ions such as initial pH, adsorbent dosage and different initial concentration of Pb(II) ions were evaluated. The mechanism involved during the adsorption process was explored based on ion exchange study and using spectroscopic techniques. The adsorption capacities obtained based on non-linear Langmuir isotherm for chitosan, chitosan-GLA and chitosan-alginate beads in single metal system were 34.98, 14.24 and 60.27 mg/g, respectively. However, the adsorption capacity of Pb(II) ions were reduced in the binary metal system due to the competitive adsorption between Pb(II) and Cu(II) ions. Based on the ion exchange study, the release of Ca2+, Mg2+, K+ and Na+ ions played an important role in the adsorption of Pb(II) ions by all three adsorbents but only at lower concentrations of Pb(II) ions. Infrared spectra showed that the binding between Pb(II) ions and the adsorbents involved mostly the nitrogen and oxygen atoms. All three adsorbents showed satisfactory adsorption capacities and can be considered as an efficient adsorbent for the removal of Pb(II) ions from aqueous solutions. | W. S. Wan Ngah S. Fatinathan | 2010 | Journal of Environmental Sciences2010，22，3： | 19 |
| 2 | Chitosan and chemically modified chitosan beads for acid dyes sorption显示文摘The capabilities of chitosan and chitosan-EGDE(ethylene glycol diglycidyl ether) beads for removing Acid Red 37(AR 37) and Acid Blue 25(AB 25) from aqueous solution were examined.Chitosan beads were cross-linked with EGDE to enhance its chemical resistance and mechanical strength.Experiments were performed as a function of pH,agitation period and concentration of AR 37 and AB 25.It was shown that the adsorption capacities of chitosan for both acid dyes were comparatively higher than those of chitosan-EGDE.This is mainly because cross-linking using EGDE reduces the major adsorption sites-NH3+ on chitosan.Langmuir isotherm model showed the best conformity compared to Freundlich and BET.The kinetic experimental data agreed very well to the pseudo second-order kinetic model.The desorption study revealed that after three cycles of adsorption and desorption by NaOH and HCl,both adsorbents retained their promising adsorption abilities.FT-IR analysis proved that the adsorption of acid dyes onto chitosan-based adsorbents was a physical adsorption.Results also showed that chitosan and chitosan-EGDE beads were favourable adsorbers and could be employed as low-cost alternatives for the removal of acid dyes in wastewater treatment. | AZLAN Kamari WAN SAIME Wan Ngah LAI KEN Liew | 2009 | Journal of Environmental Sciences2009，21，3： | 18 |
| 3 | Biosorption of copper ions from dilute aqueous solutions on base treated rubber (Hevea brasiliensis) leaves powder: kinetics, isotherm, and biosorption mechanisms显示文摘The effciency of sodium hydroxide treated rubber (Hevea brasiliensis) leaves powder (NHBL) for removing copper ions from aqueous solutions has been investigated. The e?ects of physicochemical parameters on biosorption capacities such as stirring speed, pH, biosorbent dose, initial concentrations of copper, and ionic strength were studied. The biosorption capacities of NHBL increased with increase in pH, stirring speed and copper concentration but decreased with increase in biosorbent dose and ionic strength... | W.S.Wan Ngah M.A.K.M.Hanafiah | 2008 | Journal of Environmental Sciences2008，20，10： | 12 |
| 4 | Acid Blue 25 adsorption on base treated Shorea dasyphylla sawdust:Kinetic,isotherm,thermodynamic and spectroscopic analysis显示文摘The potential of base treated Shorea dasyphylla(BTSD) sawdust for Acid Blue 25(AB 25) adsorption was investigated in a batch adsorption process.Various physiochemical parameters such as pH,stirring rate,dosage,concentration,contact time and temperature were studied.The adsorbent was characterized with Fourier transform infrared spectrophotometer,scanning electron microscope and Brunauer,Emmett and Teller analysis.The optimum conditions for AB 25 adsorption were pH 2,stirring rate 500 r/min,adsorbent dosage 0.10 g and contact time 60 min.The pseudo second-order model showed the best conformity to the kinetic data.The equilibrium adsorption of AB 25 was described by Freundlich and Langmuir,with the latter found to agree well with the isotherm model.The maximum monolayer adsorption capacity of BTSD was 24.39 mg/g at 300 K,estimated from the Langmuir model.Thermodynamic parameters such as Gibbs free energy,enthalpy and entropy were determined.It was found that AB 25 adsorption was spontaneous and exothermic. | Megat Ahmad Kamal Megat Hanafiah Wan Saime Wan Ngah Shahira Hilwani Zolkafly Lee Ching Teong Zafri Azran Abdul Majid | 2012 | Journal of Environmental Sciences2012，24，2： | 3 |
| 5 | Removal of heavy metal ions from wastewater by chemically modified plant wastes as adsorbents: A review显示文摘 | W.S. Wan Ngah M.A.K.M. Hanafiah | 2007 | Bioresource Technology2007，，10： | 3 |
| 6 | Sequestration of toxic Pb(Ⅱ) ions by chemically treated rubber(Hevea brasiliensis) leaf powder显示文摘Rubber leaf powder(an agricultural waste) was treated with potassium permanganate followed by sodium carbonate and its performance in the removal of Pb(Ⅱ) ions from aqueous solution was evaluated.The interactions between Pb(Ⅱ) ions and functional groups on the adsorbent surface were confirmed by Fourier transform infrared(FT-IR) spectroscopy,scanning electron microscopy(SEM) coupled with X-ray energy dispersive spectroscopy(EDX).The effects of several important parameters which can affect adsorption capacity such as pH,adsorbent dosage,initial lead concentration and contact time were studied.The optimum pH range for lead adsorption was 4-5.Even at very low adsorbent dosage of 0.02 g,almost 100% of Pb(Ⅱ) ions(23 mg/L) could be removed.The adsorption capacity was also dependent on lead concentration and contact time,and relatively a short period of time(60-90 min) was required to reach equilibrium.The equilibrium data were analyzed with Langmuir,Freundlich and Dubinin-Radushkevich isotherms.Based on Langmuir model,the maximum adsorption capacity of lead was 95.3 mg/g.Three kinetic models including pseudo first-order,pseudo second-order and Boyd were used to analyze the lead adsorption process,and the results showed that the pseudo second-order fitted well with correlation coefficients greater than 0.99. | Megat Hanafiah Megat Ahmad Kamal Wan Mat Khalir Wan Khaima Azira Mohamed Kasmawati Zakaria Haslizaidi Wan Ngah Wan Saime | 2010 | Journal of Environmental Sciences2010，22，2： | 3 |
| 7 | Adsorption of dyes and heavy metal ions by chitosan composites: A review显示文摘 | W.S. Wan Ngah L.C. Teong M.A.K.M. Hanafiah | 2010 | Carbohydrate Polymers2010，，4： | 2 |
| 8 | Adsorption of humic acid from aqueous solutions on crosslinked chi- tosan-epichlorohydrin beads: kinetics and isotherm stud- ies显示文摘 | Wan Ngah W S Hanafiah M A Yong S S | 2008 | Colloids and Surfaces B: Biointerfaces2008，65，： | 1 |
| 9 | Instructional strategy in the teaching of computer programming:a need assessment analyses显示文摘 | Ismail M N Ngah N A Umar I N | 2010 | The Turkish Online Journal of Educational Technology2010，9，2： | 1 |
| 10 | Adaptive fuzzy moving k-means clustering algorithm for image segmentation 显示文摘 | Isa N A M Salamah S A Ngah U K | 2009 | IEEE Transactions on Consumer Electronics2009，55，4： | 1 |
| 11 | Equilibrium and ki- netics studies of adsorption of copper(Ⅱ) on chitosan and chitosan/PVA beads 显示文摘 | Wan Ngah W S Kamari A Koay Y J | 2004 | International Journal of Biologi- cal Macromolecules2004，34，3： | 1 |
| 12 | Adsorption ofdyes and heavy metal ions by chitosan composites:A review显示文摘 | Wan Ngah Teong L C Hanafiah M A K M | 2011 | Carbohydr Polym2011，83，4： | 1 |
| 13 | Removal of heavy metal ions from wastewater by chemically modified plant wastes as adsorbents: Areview 显示文摘 | Wan Ngah W S Hanafiah M A K M | 2008 | Bioresource Technology2008，99，10： | 1 |
| 14 | Adsorption of chromium from aqueous solution using chitosan beads 显示文摘 | Wan W S Ngah A Kamari S | 2006 | Adsorption2006，12，： | 1 |
| 15 | Chitosan flakes and chitosan-GLA beads for adsorption of p-nitrophenol in aqueous solution显示文摘 | WAN NGAH W S FATINATHAN S | 2006 | Colloids and Surfaces A:Physicochemical and Engineering Aspects2006，277，5： | 1 |
| 16 | Adsorption characterization of Pb ( Ⅱ ) and Cu( Ⅱ) ions onto chitosan-tripolyphosphate beads: Kinetic, equilibrium and thermodynamic studies 显示文摘 | Ngah W S Fatinathan S | 2010 | Journal of Environmental Management2010，91，： | 1 |
| 17 | Composition and source apportionment of dust fall around a natural lake显示文摘The aim of this study was to determine the source apportionment of dust fall around Lake Chini, Malaysia. Samples were collected monthly between December 2012 and March2013 at seven sampling stations located around Lake Chini. The samples were filtered to separate the dissolved and undissolved solids. The ionic compositions(NO-3, SO2-4, Cl-and NH+4) were determined using ion chromatography(IC) while major elements(K, Na, Ca and Mg) and trace metals(Zn, Fe, Al, Ni, Mn, Cr, Pb and Cd) were determined using inductively coupled plasma mass spectrometry(ICP-MS). The results showed that the average concentration of total solids around Lake Chini was 93.49 ± 16.16 mg/(m2·day). SO2-4, Na and Zn dominated the dissolved portion of the dust fall. The enrichment factors(EF) revealed that the source of the trace metals and major elements in the rain water was anthropogenic, except for Fe. Hierarchical agglomerative cluster analysis(HACA) classified the seven monitoring stations and 16 variables into five groups and three groups respectively. A coupled receptor model, principal component analysis multiple linear regression(PCA-MLR), revealed that the sources of dust fall in Lake Chini were dominated by agricultural and biomass burning(42%),followed by the earth's crust(28%), sea spray(16%) and a mixture of soil dust and vehicle emissions(14%). | Mohd Talib Latif Sofia Aida Ngah Doreena Dominick Intan Suraya Razak Xinxin Guo Thunwadee Srithawirat Idris Mushrifah | 2015 | Journal of Environmental Sciences2015，27，7： | 1 |
| 18 | The effects of ingratiation on employee career success显示文摘 | Zin SM Ngah NE Ismail R | | 0，，： | 1 |
| 19 | Adsorption characterization of Pb ( I1 ) and Cu ( ]I ) ions onto chitosan- tripolyphosphate beads: Kinetic, equilibrium and thermodynamic studies显示文摘 | Ngah W Fatinathan S | 2010 | Journal of environmental management2010，91，4： | 1 |
| 20 | Removal of heavy metal ions from wastewater by chemically modified plant wastes as adsorbents: A review显示文摘 | WAN NGAH WS HANAFIAH MAKM | 2008 | Bioresource Technology2008，99，10： | 1 |
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