Removal of molybdenum(VI) from aqueous solutions using nano zero-valent iron supported on biochar enhanced by cetyl-trimethyl ammonium bromide: adsorption kinetic, isotherm and mechanism studies

被引：21

作者：

Lian, J. J. ^{[1
]}

Huang, Y. G. ^{[2
]}

Chen, B. ^{[1
]}

Wang, S. S. ^{[1
]}

Wang, P. ^{[1
]}

Niu, S. P. ^{[1
]}

Liu, Z. L. ^{[1
]}

机构：

[1] Anhui Univ Technol, Coll Energy & Environm, Maanshan 243002, Anhui, Peoples R China

[2] Hubei Polytech univ, Sch Environm Sci & Engn, Huangshi 435003, Peoples R China

来源：

WATER SCIENCE AND TECHNOLOGY | 2018年 / 77卷

基金：

中国国家自然科学基金;

关键词：

adsorption; biochar; molybdenum; nano zero-valent iron; pomelo peel; WASTE-WATER; RECOVERY; MO(VI); THERMODYNAMICS; OXIDES; MEDIA; PEEL; VI; RE;

D O I：

10.2166/wst.2018.258

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A new carbonized pomelo peel biosorbent (MCPP) modified with nanoscale zero-valent iron (NZVI) and cetyl-trimethyl ammonium bromide was prepared and employed for the adsorption of molybdate (Mo(VI)) from aqueous solution. We investigated the effects of various conditions on Mo(VI) adsorption and evaluated the results based on adsorption kinetics models and isotherm equations. The kinetic data fitted to the pseudo-second-order model. The Langmuir model best described the adsorption of Mo(VI) on MCPP. The values of changes in Gibbs free energy, standard enthalpy, and standard entropy revealed that the adsorption process was feasible, spontaneous and endothermal. X-ray diffraction, Fourier transform infrared and X-ray photoelectron spectroscopy measurements suggested that Mo(VI) adsorption occurred via both the reduction and surface adsorption. Thus, biochar, prepared from fruit residue, can be applied to remove Mo(VI) from aqueous solutions. More importantly, our results provide a sustainable approach for Mo(VI) removal from wastewater by means of functional modification.

引用

页码：859 / 868

页数：10

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