环境工程学报2025，Vol.19Issue(11)：2779-2793,15.DOI:10.12030/j.cjee.202501088
干湿和氧化老化生物炭吸附溶液中Cd2+机制的定量分析
Quantitative analysis on Cd2+adsorption mechanism by dry-wet and oxidative aged biochars in aqueous solutions
摘要
Abstract
To clarify the changes of biochar characteristics and its Cd2+adsorption mechanisms under two common aging processes(dry-wet alternating and oxidative aging),pristine biochar(BC),dry-wet alternating aging biochar(DWBC)and oxidative aging biochar(OBC)from Pennisetum giganteum straw were prepared in this study.The Cd2+adsorption mechanisms by biochars were analyzed qualitatively and quantitatively through batch experiments,DFT calculations and biochar characterization.It showed that the Cd2+adsorption by DWBC and OBC decreased to 50.87%and 53.89%compared with that of BC,and the aging process had reduced the Cd2+adsorption capacity of biochars.The mineral precipitation(Qpre)of DWBC and OBC decreased by 12.49%and 26.95%,respectively,and the mineral loss from biochars was the main reason for the Cd2+adsorption decrease.However,mineral precipitation was still the main mechanism for the adsorption of Cd2+by DWBC.In contrast,the ion exchange(Q exc)was the dominant Cd2+adsorption mechanism on OBC and its contribution was 6.41%and 9.44%higher than that of BC and DWBC,respectively.In addition,the ether group and phenolic hydroxyl group were the key functional groups that affected the Cd2+adsorption on biochars.This study revealed the influence of dry-wet alternation and oxidative aging on the Cd2+adsorption on biochars,which had provided theoretical support for the application of biochars in Cd2+pollution wastewater treatment.关键词
生物炭/老化/Cd吸附/吸附机制/定量分析Key words
biochar/aging/cadmium adsorption/adsorption mechanism/quantitative analysis分类
资源环境引用本文复制引用
周海怡,邵嘉庆,曹镕楷,杨旭彬,杨宇豪,尹光彩..干湿和氧化老化生物炭吸附溶液中Cd2+机制的定量分析[J].环境工程学报,2025,19(11):2779-2793,15.基金项目
广州市科技计划资助项目(202206010057) （202206010057）
