Influence of pyrolysis temperature on the cadmium and lead removal behavior of biochar derived from oyster shell waste

被引：31

作者：

Lian W. ^{[1
,2
]}

Li H. ^{[1
,2
]}

Yang J. ^{[1
,2
]}

Joseph S. ^{[1
,4
]}

Bian R. ^{[1
,2
]}

Liu X. ^{[1
,2
]}

Zheng J. ^{[1
,2
]}

Drosos M. ^{[1
,2
]}

Zhang X. ^{[1
,2
]}

Li L. ^{[1
,2
]}

Shan S. ^{[3
]}

Pan G. ^{[1
,2
]}

机构：

[1] Institute of Resources, Ecosystem and Environment of Agriculture, and Center of Biochar and Green Agriculture, Nanjing Agricultural University, 1 Weigang, Nanjing

[2] Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing Agricultural University, 1 Weigang, Nanjing

[3] Key Laboratory of Recycling and Eco-treatment of Waste Biomass of Zhejiang Province, Zhejiang University of Science & Technology, Hangzhou

[4] School of Materials Science and Engineering, University of New South Wales, Sydney, 2052, NSW

来源：

Bioresource Technology Reports | 2021年 / 15卷

基金：

中国国家自然科学基金;

关键词：

Cadmium; Lead; Mitigation; Oyster shell biochar; Pyrolysis temperature;

D O I：

10.1016/j.biteb.2021.100709

中图分类号：

学科分类号：

摘要：

Oyster shells (OSs) were pyrolyzed at 300 °C, 600 °C, and 900 °C to produce oyster shell biochars (OSB300, OSB600, and OSB900, respectively). The physicochemical properties and adsorption mechanisms for the removal of Cd and Pb by the biochars were then investigated. The results indicated that the calcite in OS decomposed into CaO at 900 °C, which may further influence its adsorption capacity. OSBs had a higher affinity for Pb than Cd as they could hydrolyze Pb more easily. OSB900 exhibited superior adsorption performance for Cd (153.8 mg·g−1) in batch adsorption, but the lowest adsorption performance for Pb (923.3 mg·g−1). Furthermore, the Pb adsorbed on OSB900 mainly presented as stable carbonate precipitation (Pb3(CO3)2·Pb(OH)2). Soil amendment with OSB900 at a 0.5% dosage most effectively decreased the CaCl2-extractable Cd and Pb by up to 98% and 88%, respectively. These findings suggest that OSBs are suitable for Cd and Pb immobilization in both wastewater and contaminated soil. © 2021 Elsevier Ltd

引用

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