adsorption of cr(vi) and speciation of cr(vi) and cr(iii) in aqueous solutions using chemically modified chitosan吸附铬(vi)和物种形成的铬(vi)和铬(iii)使用化学改性壳聚糖水溶液.pdfVIP

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adsorption of cr(vi) and speciation of cr(vi) and cr(iii) in aqueous solutions using chemically modified chitosan吸附铬(vi)和物种形成的铬(vi)和铬(iii)使用化学改性壳聚糖水溶液.pdf

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adsorption of cr(vi) and speciation of cr(vi) and cr(iii) in aqueous solutions using chemically modified chitosan吸附铬(vi)和物种形成的铬(vi)和铬(iii)使用化学改性壳聚糖水溶液

Int. J. Environ. Res. Public Health 2012, 9, 1757-1770; doi:10.3390/ijerph9051757 OPEN ACCESS International Journal of Environmental Research and Public Health ISSN 1660-4601 /journal/ijerph Article Adsorption of Cr(VI) and Speciation of Cr(VI) and Cr(III) in Aqueous Solutions Using Chemically Modified Chitosan Jun Dai 1,2, FengLian Ren 1,* and ChunYuan Tao 2 1 College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Hunan, China; E-Mail: deardaijun@ 2 College of Chemistry and Chemical Engineering, JiuJiang University, Jiujiang 332005, Jiangxi, China; E-Mail: taochunyuan@ * Author to whom correspondence should be addressed; E-Mail: renfl2008@163.com; Tel: +86-731-8887-9758. Received: 6 March 2012; in revised form: 1 April 2012 / Accepted: 23 April 2012 / Published: 7 May 2012 Abstract: A new type of grafting chitosan (CTS) was synthesized using 2-hydroxyethyl- trimethyl ammonium chloride (HGCTS). The adsorption of Cr(VI) on HGCTS was studied. The effect factors on adsorption and the adsorption mechanism were considered. The results indicated that the HGCTS could concentrate and separate Cr(VI) at pH 4.0; the adsorption equilibrium time was 80 min; the maximum adsorption capacity was 205 mg/g. The adsorption isotherm and kinetics were investigated, equilibrium data agreed very well with