期刊
JOURNAL OF CLEANER PRODUCTION
卷 314, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2021.128074
关键词
Poplar saw dust; Biochar; Pb2+/Cd2+; Adsorption; Wastewater treatment
资金
- National Natural Science Foundation of China [21567013]
- PHD Fund of the Henan Polytechnic University [B2020-19, B2021-25]
- Research Fund of Henan Key Laboratory of Coal Green Conversion (Henan Polytechnic University)
- Postdoctoral Fund of the Henan Polytechnic University [712108/218]
- Yunan Ten Thousand Talents Plan Young & Elite Talents Project [2018-73]
Biochar produced from pyrolysis of poplar saw dust is used as a sustainable adsorbent for investigating the adsorption of Pb2+/Cd2+ from wastewater. The adsorption of Cd2+ is inhibited in different water systems, while the uptake of Pb2+ remains unaffected. Mineral precipitation and coordination with 7C electrons are identified as the main mechanisms for Pb2+ and Cd2+ adsorption, respectively.
Biochar is produced at 400-800 degrees C by pyrolysis of poplar saw dust, which is used as the sustainable adsorbent to investigate the adsorption performance of Pb2+/Cd2+ from wastewater. The adsorption kinetics and isotherms of Pb2+/Cd2+ on biochar were determined. The maximum adsorption amount of Pb2+ is 62.68 mg/g, while that of Cd2+ is 49.32 mg/g at pH of 5 based on Langmuir equation. The Cd2+ adsorption was seriously inhibited, while the uptake of Pb(II) was not significantly affected in the multimetal system. The adsorption performance of Pb2+/Cd2+ was also investigated in different water systems. Mineral precipitation with Pb2+ is predominant mechanism for Pb2+ removal with the contribution proportion of 51.76%. Coordination with 7C electrons is the primary mechanism for Cd2+ adsorption, at 59.36% of the total adsorption capacity. Our findings provide a successful example of poplar saw dust converting into the sustainable adsorbent for Pb2+/Cd2+ removal from wastewater to implement the concept of clean production, which is worthy of further study.
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