Removal of Cd and Pb with biochar made from dairy manure at low temperature

Zhi-liang CHEN; Jian-qiang ZHANG; Ling HUANG; Zhi-hui YUAN; Zhao-jun LI; Min-chao LIU

Journal of Integrative Agriculture (Jan 2019)

Removal of Cd and Pb with biochar made from dairy manure at low temperature

Zhi-liang CHEN,
Jian-qiang ZHANG,
Ling HUANG,
Zhi-hui YUAN,
Zhao-jun LI,
Min-chao LIU

Affiliations

Zhi-liang CHEN: Guangdong Engineering Technology Research Center of Heavy Metal Pollution Control and Restoration in Farmland Soil, South China Institute of Environmental Sciences, Guangzhou 510635, P.R.China; Correspondence CHEN Zhi-liang, Mobile: +86-18902269985
Jian-qiang ZHANG: Guangdong Engineering Technology Research Center of Heavy Metal Pollution Control and Restoration in Farmland Soil, South China Institute of Environmental Sciences, Guangzhou 510635, P.R.China
Ling HUANG: Guangdong Engineering Technology Research Center of Heavy Metal Pollution Control and Restoration in Farmland Soil, South China Institute of Environmental Sciences, Guangzhou 510635, P.R.China
Zhi-hui YUAN: School of Environment and Chemistry, Wuyi University, Jiangmen 529020, P.R.China
Zhao-jun LI: Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture/China-New Zealand Joint Laboratory for Soil Molecular Ecology, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China; Correspondence LI Zhao-jun, Tel: +86-10-82108657
Min-chao LIU: School of Environment and Chemistry, Wuyi University, Jiangmen 529020, P.R.China

Journal volume & issue: Vol. 18, no. 1
pp. 201 – 210

Abstract

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Biochar (BC) derived from waste products is a cost-effective sorbent for remediation of metal-contaminated soils. We studied the kinetics and adsorption mechanisms for removal of metal ions, such as lead (Pb2+) and cadmium (Cd2+) with biochar. The adsorption capacities of BC for Pb2+ and Cd2+ increased after alkaline treatment. The highest sorption capacities were 175.53 and 68.08 mg g–1, for Pb and Cd, respectively. The Langmuir adsorption isotherm and pseudo second kinetic equation could well fit the adsorption processes, revealing that the sorption mechanisms of Pb2+ and Cd2+ by BC are complex and predominantly controlled by chemisorption. BC has a higher affinity for Pb than Cd, due to easy hydrolysis of Pb at low pH. Furthermore, precipitation as carbonate minerals (2PbCO3·Pb(OH)2 and CdCO3) and complexation with functional groups (carboxyl and hydroxyl) were also important for adsorption of Pb and Cd by BC.

Published in Journal of Integrative Agriculture

ISSN: 2095-3119 (Print); 2352-3425 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Agriculture: Agriculture (General)
Website: https://www.journals.elsevier.com/journal-of-integrative-agriculture

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