期刊
CHEMICAL ENGINEERING JOURNAL
卷 288, 期 -, 页码 739-744出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2015.12.070
关键词
Nanoscale zero-valent iron; Pumice; Chitosan; Arsenic(III); Wastewater
资金
- Innovation Team Training Plan of the Tianjin Education Committee [TD12-5037]
- National Natural Science Foundation of China [21307090]
- Tianjin Municipal Natural Science Foundation of China [14JCZDJC41000]
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. (C) 2015 Elsevier B.V. All rights reserved.
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