环境工程学报2025，Vol.19Issue(4)：851-861,11.DOI:10.12030/j.cjee.202410119
二硫化碳改性荔枝壳对重金属离子的吸附性能及机理
Adsorption performance and mechanism of carbon disulfide-modified lychee shells for heavy metal ions
摘要
Abstract
To address the treatment of heavy metal wastewater,which often exists in composite forms in real-world environments,carbon disulfide-modified lychee shell(CLS)was prepared using lychee shell(LS)as the raw material and CS2 as the modifier.This study investigated the adsorption performance and mechanism of CLS for Cu(Ⅱ),Pb(Ⅱ),and Zn(Ⅱ)in both single-metal and composite pollution systems.The results showed that the maximum removal efficiencies of Cu(Ⅱ),Pb(Ⅱ),and Zn(Ⅱ)by CLS reached 99.94％,92.65％,and 93.35％,respectively.The optimal CLS dosage varied depending on the pollution system.In the single-metal system,the optimal dosages for Cu(Ⅱ),Pb(Ⅱ),and Zn(Ⅱ)were 3,1,and 5 g·L-1,respectively,whereas in the composite system,the optimal dosage was 10 g·L-1.A competitive adsorption effect was observed among the three metals,with CLS exhibiting the highest affinity for Cu(Ⅱ),followed by Zn(Ⅱ)and Pb(Ⅱ)(Cu(Ⅱ)＞Zn(Ⅱ)＞Pb(Ⅱ)).In both single and composite systems,adsorption was predominantly chemisorption,involving both monolayer and multilayer adsorption.The process was a non-uniform physico-chemical multiphase interaction,characterized as an exothermic reaction that increased the order of the solid-liquid interface.Additionally,higher temperatures inhibited the adsorption of the three metals onto CLS.These findings provide new insights into the valorization of lychee shell waste and its potential application in heavy metal wastewater treatment.关键词
铜/铅/锌/复合污染体系/竞争吸附/二硫化碳Key words
copper/lead/zinc/composite pollution system/competitive adsorption/carbon disulfide分类
环境科学引用本文复制引用
贺懿琛,张翠玲,尚志栋,蔺禧丹,贾慧玲,安国凤..二硫化碳改性荔枝壳对重金属离子的吸附性能及机理[J].环境工程学报,2025,19(4):851-861,11.基金项目
甘肃省科技计划项目(22CX3GA076) （22CX3GA076）
甘肃省教育厅产业支撑计划项目(2021CYZC-31) （2021CYZC-31）
宁夏回族自治区自然科学基金项目(2023AAC03336) （2023AAC03336）
