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

Zhonghao Wan; Dong Wan Cho; Daniel C.W. Tsang; Meng Li; Tan Sun; Francis Verpoort

doi:10.1016/j.envpol.2019.01.047

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

Zhonghao Wan, Dong Wan Cho, Daniel C.W. Tsang, Meng Li, Tan Sun, Francis Verpoort

Research output: Journal article publication › Journal article › Academic research › peer-review

132 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	410-420
Number of pages	11
Journal	Environmental Pollution
Volume	247
DOIs	https://doi.org/10.1016/j.envpol.2019.01.047
Publication status	Published - Apr 2019

Keywords

Engineered biochar
Green/sustainable remediation
Hexavalent chromium
Metal-biochar composite
Solid-supported nZVI

ASJC Scopus subject areas

Toxicology
Pollution
Health, Toxicology and Mutagenesis

More information

10.1016/j.envpol.2019.01.047

Cite this

@article{c2faf245f27f4938b44410287fde37f8,

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

abstract = "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.",

keywords = "Engineered biochar, Green/sustainable remediation, Hexavalent chromium, Metal-biochar composite, Solid-supported nZVI",

author = "Zhonghao Wan and Cho, {Dong Wan} and Tsang, {Daniel C.W.} and Meng Li and Tan Sun and Francis Verpoort",

year = "2019",

month = apr,

doi = "10.1016/j.envpol.2019.01.047",

language = "English",

volume = "247",

pages = "410--420",

journal = "Environmental Pollution",

issn = "0269-7491",

publisher = "Elsevier Ltd",

}

TY - JOUR

T1 - Concurrent adsorption and micro-electrolysis of Cr(VI) by nanoscale zerovalent iron/biochar/Ca-alginate composite

AU - Wan, Zhonghao

AU - Cho, Dong Wan

AU - Tsang, Daniel C.W.

AU - Li, Meng

AU - Sun, Tan

AU - Verpoort, Francis

PY - 2019/4

Y1 - 2019/4

N2 - 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.

AB - 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.

KW - Engineered biochar

KW - Green/sustainable remediation

KW - Hexavalent chromium

KW - Metal-biochar composite

KW - Solid-supported nZVI

UR - http://www.scopus.com/inward/record.url?scp=85060933102&partnerID=8YFLogxK

U2 - 10.1016/j.envpol.2019.01.047

DO - 10.1016/j.envpol.2019.01.047

M3 - Journal article

C2 - 30690237

AN - SCOPUS:85060933102

SN - 0269-7491

VL - 247

SP - 410

EP - 420

JO - Environmental Pollution

JF - Environmental Pollution

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

More information

Other files and links

Fingerprint

Cite this