期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 438, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2022.129467
关键词
Alkaline hydrogen peroxide; Engineered biochar; Cd(2+)removal; Adsorption mechanism; Density Functional Theory
资金
- National Natural Science Foundation of China [41977297]
- Anhui Provincial Natural Science Foundation [1808085MD104]
- Postdoctoral Science Foundation of China [2017M622020]
The alkaline hydrogen peroxide pretreatment greatly enhanced the Cd2+ adsorption performance of sesame straw-derived biochar, mainly affected by the surface functional groups. The dominant adsorption mechanisms for Cd2+ were identified as ion exchange, co-precipitation, surface complexation, and Cd2+-pi interaction, with experimental results fitting well with the BJP model.
The sesame straw-derived biochar was successfully prepared via alkaline hydrogen peroxide (AHP) pretreatment in this study. Systematic experimental characterizations, 15 relevant batch and column adsorption models, combined with density functional theory (DFT) calculation were used to investigate the performances and micro-mechanisms of Cd2+ adsorption onto biochar. We found AHP-pretreatment could greatly improve the adsorption performance of biochar for Cd2+. The maximum Cd2+ adsorption capacity of AHP-pretreated biochar (87.13 mg g(-1)) was much larger than that of unpretreated biochar. Cd2+ adsorption was mainly dominated by the chemisorption of the homogeneous surface monolayer. The hydroxyl and carboxyl groups on the surface of biochar provided preferential adsorption sites, and liquid film diffusion and intra-particle diffusion were two dominant rate-controlling steps. Our results showed that ion exchange, co-precipitation, surface complexation, and Cd2+-pi interaction were the dominant adsorption mechanisms. Especially, DFT calculations well-identified that lone-pair electrons during complexation and pi electrons during coordination were provided by oxygen-containing functional groups and aromatic rings, respectively. The experimental breakthrough curves fitted better with the theoretical value of the BJP model, compared to Thomas, Yoon-Nelson, and EXY models. Overall, our study provides a promising method for Cd2+ removal from wastewater and resource utilization of agricultural wastes.
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