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环境化学  2015 

响应面法优化腐殖酸去除水中重金属铬的吸附条件及热力学研究

Keywords: 腐殖酸,吸附,六价铬,响应曲面法,热力学

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Abstract:

采用Box-Behnken响应面优化实验设计对腐殖酸吸附去除水中重金属六价铬的影响因素(如温度、pH、铬酸钾初始浓度、吸附剂用量)进行研究,建立了去除率与上述因素之间的二次多项式模型,得到腐殖酸去除六价铬的最佳条件为温度51℃、pH=2.34、铬酸钾初始浓度14.30mg·L-1和吸附剂用量0.58g,此条件下六价铬的最大去除率可达到73.17%(预测值为73.26%).用Langmuir、Freundlich和Redlich-Peterson方程对吸附等温线进行拟合,Langmuir方程拟合结果最好,其最大吸附量为60.241mg·g-1.计算得到了腐殖酸吸附水中六价铬的热力学状态函数ΔH、ΔG及ΔS分别为14.18kJ·mol-1、-3.609kJ·mol-1和0.053kJ·(mol·)k-1,对六价铬在腐殖酸上的吸附机理进行了探讨.

References

[1]  Kim C, Zhou Q H, Deng B L, et al. Chromium(VI) reduction by hydrogen sulfide in aqueous media[J]. Environmental Science Technology, 2001, 35(11): 2219-2225
[2]  Onstott E I, Gregory W S. Removal of chromate from cooling tower blowdown by reaction with electrochemically generated ferrous hydroxide[J]. Environmental Science Technology, 1973, 7(4): 333-337
[3]  Pettine M, Campanella L, Millero F J. Reduction of hexavalent chromium by H2O2 in acidic solutions[J]. Environmental Science Technology, 2002, 36(5): 901-907
[4]  Buerge I J, Hug S J. Influence of organic ligands on chromium(VI) reduction by iron(Ⅱ)[J]. Environmental Science Technology, 1998, 32(14): 2092-2099
[5]  Yurkow E J, Hong J, Min S. Photochemical reduction of hexavalent chromium in glycerol-containing solutions[J]. Environmental Pollution, 2002, 117: 1-3
[6]  Smith D S, Wu F C. Preface: Metal interactions with natural organic matter[J].Applied Geochemistry, 2007, 22: 1567
[7]  王亚军, 马军. 水体环境中天然有机质腐殖酸研究进展[J]. 生态环境学报, 2012, 21(6):1155-1165
[8]  Artola A, Martin M and Balaguer M D. Isotherm model analysis for the adsorption of Cd(Ⅱ), Cu(Ⅱ), Ni(Ⅱ), and Zn(Ⅱ) on anaerobically digested sludge[J]. Journal of Colloid and Interface Science, 2000, 232(1): 64-70
[9]  Aksu Z, Donmez G. Binary biosorption of cadmium (Ⅱ) and nickel (Ⅱ) onto dried Chlorella vulgaris: Co ion effect on monocomponent[J]. Process Biochemistry, 2006, 41: 860-868
[10]  Ko?uh N, ?tupar J, Gorenc B. Reduction and oxidation processes of chromium in soils[J]. Environmental Science Technology, 2000, 34(1): 112-119
[11]  Wu F C, Tanoue E. Isolation and partial characterization of dissolved copper-complexing ligands in streamwaters[J]. Environmental Science Technology, 2001, 35(18): 3646-3652
[12]  Ohlenbusch G, Kumke M U, Frimmel F H. Sorption of phenols to dissolved organic mater investigated by solid phase microextraction[J]. Science of the Total Environment, 2000, 253: 63-74
[13]  Wang J P, Chen Y Z, Wang Y, et al. Optimization of the coagulation-flocculation process for pulp mill wastewater treatment using a combination of uniform design and response surface methodology[J]. Water Research, 2011, 17(45): 5633-5640
[14]  Ahmad A L, Ismail S, Bhatia S. Optimization of coagulation-flocculation process for palm oil mill effluent using response surface methodology[J]. Environmental Science Technology, 2005, 39(8): 2828-2834
[15]  国家环境保护总局. 水和废水检测分析方法(第四版)[M]. 北京: 中国环境科学出版社, 2002
[16]  Poyet S, Charles S. Temperature dependence of the sorption isotherms of cement-based materials: Heat of sorption and Clausius-Clapeyron formula[J].Cement and Concrete Research, 2009, 39(11):1060-1067
[17]  Trapnell B M W.ⅤAdsorption Isotherms. Chemisorption[M]. Lecture in Chemistry. Liverpool University, 1995: 109-124

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