期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 24, 期 15, 页码 13837-13844出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-017-8974-9
关键词
Zeolite-supported microscale zero-valent iron (Z-mZVI); Heavy metal removal; Adsorption capacity; Thomas model
资金
- Hebei Provincial Natural Science Foundation, China [D2016504014]
- Fundamental Research Funds of Chinese Academy of Geological Sciences (CAGS) [SK201613, SK201502]
A new composite adsorbent, zeolite-supported microscale zero-valent iron (Z-mZVI) was evaluated as a potential adsorbent for the removal of Cd2+ and Pb2+ from aqueous solution using batch and column experiments. Adsorption isotherms were well fitted by Langmuir model, and the maximum adsorption capacity was 63.14 mg/g for Cd2+ and 154.61 mg/g for Pb2+, respectively. Both adsorption processes followed the pseudo-second-order model which indicated that the rate-limiting step for different initial concentration was dominated by chemical adsorption process. The coexistence of Cd2+ and Pb2+ caused the reduction of Cd2+ removal efficiency, but not for Pb2+. Z-mZVI has a high removal capacity for Cd2+ and Pb2+ over a wide pH range (3.0-6.8) as well as in the presence of competitive Ca2+ or Mg2+ ions (< 2 mmol/L). Moreover, Z-mZVI shows a high immobilization capacity for the adsorbed Cd2+ and Pb2+ products, even at the acid solution (pH = 3.95). Column experiment confirmed that Z-mZVI could simultaneously remove Cd2+ and Pb2+ from solution efficiently. Thomas model can simulate the equilibrium adsorption capacity of Cd2+ and Pb2+ of the Z-mZVI column well. This study demonstrates that Z-mZVI is an efficient and promising reactive material in permeable reactive barriers for Cd2+ and Pb2+ removal from aqueous solution.
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