Remediation of arsenic(III) from aqueous solutions using improved nanoscale zero-valent iron on pumice

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	Remediation of arsenic(III) from aqueous solutions using improved nanoscale zero-valent iron on pumice
	Zhong-Liang Wang; Tingyi Liu; Yilin Yang; Yanqiu Sun
刊名	Chemical Engineering Journal
	2016
卷号	288 期号:6 页码:739-744
英文摘要	The removal of arsenic(III), one of the most poisonous wastewater pollutants, was investigated using nanoscale zero-valent iron supported onto pumice and modified by chitosan (CS-P-NZVI). Scanning electron microscopy (SEM) analysis revealed that NZVI was distributed dispersedly on CS-P-NZVI without being oxidized. As(III) could be removed by adsorption on CS-P-NZVI in a very short time (minute scale) with high removal rates (more than 99.5%) over a wide range of pH (2.01-12.54) and concentration (20100 mg/L). The removal of As(III) by CS-P-NZVI agreed well with the pseudo-first-order reaction kinetics and pseudo-second-order reaction kinetics. Reaction rate constants (K-obs) ranged from 0.27 to 0.96 min(-1) at varied NZVI dosage. Freundlich isotherm provided a good model of the sorption system, indicating that CS-P-NZVI was heterogeneous in the surface properties. The thermodynamic parameters suggested that As(III) adsorption by CS-P-NZVI was a spontaneous and exothermic process. X-ray photoelectron spectroscopy (XPS) and atomic fluorescence spectrophotometer (AFS) analyses indicated that As(III) was only physically adsorbed on the surface of CS-P-NZVI within 60 min. Our results indicated that CS-P-NZVI might be an effective material for both in situ and ex situ remediation.
学科主题	环境地球化学
语种	英语
公开日期	2017-05-22
内容类型	期刊论文
源URL	[http://ir.gyig.ac.cn:8080/handle/352002/6096]
专题	地球化学研究所_环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
推荐引用方式 GB/T 7714	Zhong-Liang Wang,Tingyi Liu,Yilin Yang,et al. Remediation of arsenic(III) from aqueous solutions using improved nanoscale zero-valent iron on pumice[J]. Chemical Engineering Journal,2016,288(6):739-744.
APA	Zhong-Liang Wang,Tingyi Liu,Yilin Yang,&Yanqiu Sun.(2016).Remediation of arsenic(III) from aqueous solutions using improved nanoscale zero-valent iron on pumice.Chemical Engineering Journal,288(6),739-744.
MLA	Zhong-Liang Wang,et al."Remediation of arsenic(III) from aqueous solutions using improved nanoscale zero-valent iron on pumice".Chemical Engineering Journal 288.6(2016):739-744.