期刊
ENVIRONMENTAL POLLUTION
卷 255, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2019.113043
关键词
Nanoscale zerovalent iron (nZVI); Activated carbon; Straw biomass; Coordination adsorption; Reductive precipitation
资金
- Science and Technology Project from Ministry of Housing and Urban-Rural Development of the People's Republic of China [2014-K7-007]
- Engineering Center for Straw Ecological Building Materials of Jiangsu Province [2015-XCL-034]
- Innovative Service Platform for Ecological Building Materials of Jiangsu Province [2015-XCL-034]
- Six Top Talents Program of Jiangsu Province [2015-XCL-034]
High performance activated carbon (HPAC) supported nanoscale zerovalent iron (nZVI) was prepared and used for recovery of silver. This composite material was characterized by Fourier transform infrared spectroscopy (MR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The removal amount of Ag+ increased with pH values and temperature. The removal process achieved equilibrium within 40 min and the maximum removal capacity was 986.5 mg/g at 298 K. The composite material showed fast adsorption rate and high adsorption capacity because the presence of high surface area activated carbon could effectively inhibit aggregation of nanoscale zerovalent iron, thus enhancing its reactivity. The Ag+ removal followed pseudo-second -order kinetic model and Langmuir isotherm model. XPS and XRD characterizations were performed to elucidate removal mechanism. It could be concluded that both coordination adsorption and reductive precipitation contributed to removal of Ag+ on the nZVI/HPAC. (C) 2019 Elsevier Ltd. All rights reserved.
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