期刊
JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 211, 期 -, 页码 73-82出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2018.01.049
关键词
Bismuth; Impregnation; Aluminum oxide; Arsenic removal; Adsorption mechanism; Practical application
资金
- National Natural Science Foundation of China [41171236]
- National Key Technology R&D Program of China [2012BAD15B03]
- National S&T Major Project of China [2012ZX07204-003]
High mobility and toxicity of arsenic [As (III)] limit its removal from an aquatic environment and pose a threat to human health. In this work, batch adsorption experiments were conducted to investigate the adsorption capacity of bismuth-impregnated aluminum oxide (BiAl). Continuous application of As (III) removal was achieved via a lab-scale column reactor. Bismuth impregnation decreased the specific surface area of aluminum oxide and affected its pore size distribution. However, because of its abundant and well-proportioned mesoporous character, it also enhanced its adsorption capacity through the surface complexation of As (III). Batch adsorption experiments demonstrated a suitable Freundlich model and a fitted pseudo-second-kinetic model for As (III) adsorption. The main mechanism was chemisorption with both bismuth and aluminum atoms; however, physisorption also contributed to arsenic adsorption at the initial stage of the reaction. The Adams-Bohart model better described the breakthrough curves than the Thomas model. BiAl exhibited efficient As (III) adsorption over a wide pH range and could be applied to As (III) removal from wastewater. A high As (III) removal efficiency (91.6%) was obtained at an initial As (III) concentration of 5 mg L-1 at a flow rate of 1 mL min(-1). This study indicates the potential for the practical application of BiAl in As (III) removal. (C) 2018 Elsevier Ltd. All rights reserved.
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