期刊
ENVIRONMENTAL POLLUTION
卷 247, 期 -, 页码 410-420出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2019.01.047
关键词
Engineered biochar; Metal-biochar composite; Solid-supported nZVI; Hexavalent chromium; Green/sustainable remediation
资金
- National Natural Science Foundation of China [51208397]
- Fundamental Research Funds for the Central Universities [20171129GX]
- Key Technology R&D Program of Hubei Province [2015BCA304]
- Hong Kong Research Grants Council [PolyU 15217818, E-PolyU503/17]
This study introduced a new approach for simultaneously enhancing Cr(VI) removal performance and mitigating release of dissolved Fe during nanoscale zero-valent iron (nZVI)-mediated reactions. After entrapping nZVI-impregnated biochar (BC) in the matrix of calcium-alginate (CA) bead, the physicochemical characterization of nZVI/BC/CA composites revealed that nZVI/BC particles were embedded inside CA having a spherical shape and several cracks on its outer layer. The multi-functionality of nZVI/BC/CA composites consisting of reductant (nZVI), porous adsorbent (BC), and external screening layer (CA) enhanced the removal of Cr(VI) with the maximum adsorption capacity of 86.4 mg/g (based on the Langmuir isotherm) and little release of dissolved Fe. With the XPS analysis and fitting results of kinetics (pseudo second order) and isotherms (Redlich-Peterson model), plausible removal mechanisms of Cr(VI) were simultaneous adsorption and micro-electrolysis reactions by nZVI/BC/CA composites. The practical applicability of nZVI/BC/CA composites was further demonstrated through the fixed-bed column experiments. These results provide new insights into the design of high-performance engineered biochar for wastewater treatment. (C) 2019 Elsevier Ltd. All rights reserved.
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