Adsorption kinetic and species variation of arsenic for As(V) removal by biologically mackinawite (FeS)
Adsorption kinetic and species variation of arsenic for As(V) removal by biologically mackinawite (FeS)
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DOI：
10.1016/j.cej.2018.08.004
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发表时间：
2018-12
影响因子：
15.1
通讯作者：
Jimei Zhou;Shu Chen;Jing Liu-;R. Frost
中科院分区：
文献类型：
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作者：
Jimei Zhou;Shu Chen;Jing Liu-;R. Frost
以FRB和SRB两种培养液为原料合成生物麦基纳维，在厌氧环境下对砷的去除具有重要作用。为了研究As(V)吸附在生物流化床上对水溶液中砷种类的影响，采用高效液相色谱-原子荧光法（HPLC-AFS）检测了水溶液中As（III/V）的含量。并用XRD、XPS、BET等手段对其固相进行了表征。As(T)的吸附包膜显示，在pH为5时，As(T)的吸收率较高。不同固液比的吸附动力学符合准二级模型，等温线符合Langmuir平衡。最大吸附量分别为237.45 mg/g（0.05 g/L FeS）、160.45 mg/g（0.1 g/L FeS）和56.71 mg/g（0.2 g/L FeS）。结果表明：随着固液比的增大，FeS对As(V)的吸附量减小；结果表明，在As(V)吸附实验中，As(V)被还原为As（III）或更低的价态。结果表明，As（others）在批处理实验中占主导地位，As(V)在柱状实验中占主导地位。XPS数据表明，FeS颗粒对还原As(V)有效，其他As可能是As- s和As-As络合物。
Biologically mackinawite was synthesized by FRB and SRB culture solutions, which had been shown a crucial role in removal arsenic under anaerobic environment. To investigate the changes of arsenic species in aqueous by As(V) sorption onto biologically FeS, As(III/V) in aqueous were detected by HPLC-AFS. And the solid phase was characterized by XRD, XPS, and BET. The adsorption envelope of As(T) shown the high uptake occurred at pH 5. The adsorption kinetics followed the pseudo- second- order model and the isotherm followed by Langmuir equilibrium for different solid/solution ratios. The maximum sorption capacities were 237.45 mg/g (0.05 g/L FeS), 160.45 mg/g (0.1 g/L FeS), and 56.71 mg/g (0.2 g/L FeS), respectively. The results showed that sorption for As(V) sorption by FeS decreased with increased in solid/solution ratios. Our results showed that As(V) was reduced to As(III) or lower valences in As(V) sorption experiments. The results showed that the As(others) dominated in the batch experiments and the As(V) was the main state in the column experiments. The XPS date suggested that the FeS particles were effective for reduce As(V) and the As(others) were possibly As-S and As-As complexes.