Concurrent adsorption and micro-electrolysis of Cr(VI) by nanoscale zerovalent iron/biochar/Ca-alginate composite.

Adsorption Alginates Calcium / chemistry Charcoal / chemistry Chromium / chemistry Electrolysis Iron / chemistry Kinetics Models, Chemical Water Pollutants, Chemical / analysis
Engineered biochar Green/sustainable remediation Hexavalent chromium Metal-biochar composite Solid-supported nZVI

Journal

Environmental pollution (Barking, Essex : 1987)
ISSN: 1873-6424
Titre abrégé: Environ Pollut
Pays: England
ID NLM: 8804476

Informations de publication

Date de publication:
Apr 2019
Historique:
received: 19 09 2018
revised: 22 11 2018
accepted: 11 01 2019
pubmed: 29 1 2019
medline: 29 3 2019
entrez: 29 1 2019
Statut: ppublish

Résumé

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.

Identifiants

DOI: 10.1016/j.envpol.2019.01.047 PMID: 30690237
pubmed: 30690237
pii: S0269-7491(18)34266-0
doi: 10.1016/j.envpol.2019.01.047
pii:
doi:

Substances chimiques

Alginates 0
Water Pollutants, Chemical 0
biochar 0
Chromium 0R0008Q3JB
Charcoal 16291-96-6
chromium hexavalent ion 18540-29-9
Iron E1UOL152H7
Calcium SY7Q814VUP

Types de publication

Journal Article

Langues

eng

Sous-ensembles de citation

IM

Pagination

410-420

Informations de copyright

Copyright © 2019 Elsevier Ltd. All rights reserved.

Auteurs

Zhonghao Wan (Z)

Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.

Dong-Wan Cho (DW)

Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.

Daniel C W Tsang (DCW)

Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China. Electronic address: dan.tsang@polyu.edu.hk.

Meng Li (M)

School of Civil Engineering & Architecture, Wuhan University of Technology, China.

Tan Sun (T)

College of Environmental Science and Engineering, Tongji University, China.

Francis Verpoort (F)

Laboratory of Organometallics, Catalysis and Ordered Materials, State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, China; Department of Inorganic and Physical Chemistry, Ghent University, Krijgslaan 281-S3, 9000, Ghent, Belgium.

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Classifications MeSH

questionsmedicales.fr › Phénomènes chimiques › Adsorption › Concurrent adsorption and micro-electrolysis...
questionsmedicales.fr › Glucides › Polyosides › Alginates › Concurrent adsorption and micro-electrolysis...
questionsmedicales.fr › Facteurs biologiques › Facteurs de la coagulation sanguine › Calcium › Concurrent adsorption and micro-electrolysis...
questionsmedicales.fr › Produits chimiques inorganiques › Éléments › Carbone › Charbon de bois › Concurrent adsorption and micro-electrolysis...
questionsmedicales.fr › Produits chimiques inorganiques › Métaux › Métaux lourds › Chrome › Concurrent adsorption and micro-electrolysis...
questionsmedicales.fr › Techniques d'investigation › Techniques électrochimiques › Électrolyse › Concurrent adsorption and micro-electrolysis...
questionsmedicales.fr › Produits chimiques inorganiques › Métaux › Métaux lourds › Fer › Concurrent adsorption and micro-electrolysis...
questionsmedicales.fr › Phénomènes chimiques › Phénomènes biochimiques › Cinétique › Concurrent adsorption and micro-electrolysis...
questionsmedicales.fr › Techniques d'investigation › Modèles théoriques › Modèles chimiques › Concurrent adsorption and micro-electrolysis...
questionsmedicales.fr › Actions chimiques et utilisations › Actions toxiques › Polluants environnementaux › Polluants de l'eau › Polluants chimiques de l'eau › Concurrent adsorption and micro-electrolysis...