Thiamethoxam adsorption by ZnCl2 modified cow manure biochar: Mechanism and quantitative prediction

Qiao Zhou; Wenjie Mai; Zhenguo Chen; Xinzhi Wang; Mengjie Pu; Jun Tu; Chao Zhang; Xiaohui Yi; Mingzhi Huang

doi:10.1016/j.envres.2023.117004

Thiamethoxam adsorption by ZnCl₂ modified cow manure biochar: Mechanism and quantitative prediction

Environ Res. 2023 Nov 15;237(Pt 2):117004. doi: 10.1016/j.envres.2023.117004. Epub 2023 Aug 27.

Authors

Qiao Zhou¹, Wenjie Mai¹, Zhenguo Chen², Xinzhi Wang¹, Mengjie Pu¹, Jun Tu¹, Chao Zhang³, Xiaohui Yi¹, Mingzhi Huang⁴

Affiliations

¹ SCNU (NAN'AN) Green and Low-carbon Innovation Center, Guangdong Provincial Engineering Research Center of Intelligent Low-carbon Pollution Prevention and Digital Technology & Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, School of Environment, South China Normal University, Guangzhou, 510006, PR China.
² SCNU (NAN'AN) Green and Low-carbon Innovation Center, Guangdong Provincial Engineering Research Center of Intelligent Low-carbon Pollution Prevention and Digital Technology & Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, School of Environment, South China Normal University, Guangzhou, 510006, PR China; SCNU Qingyuan Institute of Science and Technology Innovation Co, Ltd, Qingyuan 511517, PR China. Electronic address: zhenguo.chen@m.scnu.edu.cn.
³ SCNU (NAN'AN) Green and Low-carbon Innovation Center, Guangdong Provincial Engineering Research Center of Intelligent Low-carbon Pollution Prevention and Digital Technology & Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, School of Environment, South China Normal University, Guangzhou, 510006, PR China; School of Civil Engineering & Transportation, South China University of Technology, Guangzhou, 510640, PR China.
⁴ SCNU (NAN'AN) Green and Low-carbon Innovation Center, Guangdong Provincial Engineering Research Center of Intelligent Low-carbon Pollution Prevention and Digital Technology & Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, School of Environment, South China Normal University, Guangzhou, 510006, PR China; Huashi(Fujian) Environment Technology Co.,Ltd, Quanzhou, 362001, PR China; SCNU Qingyuan Institute of Science and Technology Innovation Co, Ltd, Qingyuan 511517, PR China; Econ Technology Co, Ltd, Yantai 265503, PR China. Electronic address: mingzhi.huang@m.scnu.edu.cn.

PMID: 37643684
DOI: 10.1016/j.envres.2023.117004

Abstract

The overuse of thiamethoxam (THM) has threatened the survival of living organisms and it is necessary to find an environmentally friendly material to remove THM frequently detected in water. Biochar prepared from cow manure modified with ZnCl₂ (Zn-CBC) was used to remove THM. Compared to the unmodified cow manure biochar (CBC), the removal ratio of THM by Zn-CBC was enhanced 35 times. In the mechanistic analysis, SEM and BET showed that Zn-CBC had a good pore structure and its specific surface area (166.502 m² g^-1) increased to 17 times that of CBC, indicating that Zn-CBC had good pore adsorption properties. The adsorption kinetic and isotherm implied that the main mechanism was chemisorption including π-π interaction and H-bonding. Furthermore, the stable graphitized structure of Zn-CBC allowed for efficient adsorption and reusability. In addition, this study constructed an intelligent prediction model using batch experiment data, and the high R² (0.978) and low RMSE (0.057) implied that the model could accurately and quantitatively predict the adsorption efficiency. This paper provides a novel perspective to simultaneously remove the neonicotinoid insecticides and realize the resource utilization of cow manure.

Keywords: Adsorption; Cow manure biochar; Intelligent prediction; Mechanism; Resource utilization; Thiamethoxam.