摘要
为处理实际环境中常以复合形式存在的重金属废水,本研究以荔枝壳(LS)为原料、CS_(2)为改性剂,制备得到二硫化碳改性荔枝壳(CLS)。探讨了CLS对单一及复合污染体系中Cu(Ⅱ)、Pb(Ⅱ)和Zn(Ⅱ)的吸附性能及机制。结果表明,CLS对Cu(Ⅱ)、Pb(Ⅱ)和Zn(Ⅱ)的最高去除率分别达到了99.94%、92.65%和93.35%。不同的污染体系,CLS的最佳投加量不相同,在单一金属污染体系中,对于Cu(Ⅱ)、Pb(Ⅱ)和Zn(Ⅱ),CLS的最佳投加量分别为3、1和5 g·L^(-1);在复合污染体系中,CLS的最佳投加量为10 g·L^(-1)。3种金属之间存在竞争作用,CLS对3种金属的亲和力呈现出Cu(Ⅱ)>Zn(Ⅱ)>Pb(Ⅱ)的规律。在单一和复合污染体系中CLS对3种金属的吸附均以单分子层和多分子层同时存在的化学吸附为主,吸附过程为非均匀的物理-化学多相作用过程,吸附过程是一个系统的固-液界面有序程度增加的放热过程,升高温度阻碍CLS对3种金属的吸附过程的正向进行。研究成果为荔枝壳的资源化利用和水中重金属废水处理提供了新的思路。
To address the treatment of heavy metal wastewater,which often exists in composite forms in realworld 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.
作者
贺懿琛
张翠玲
尚志栋
蔺禧丹
贾慧玲
安国凤
HE Yichen;ZHANG Cuiling;SHANG Zhidong;LIN Xidan;JIA Huiling;AN Guofeng(School of Environment and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Gansu Provincial Key Laboratory of Yellow River Water Environment,Lanzhou 730070,China)
出处
《环境工程学报》
北大核心
2025年第4期851-861,共11页
Chinese Journal of Environmental Engineering
基金
甘肃省科技计划项目(22CX3GA076)
甘肃省教育厅产业支撑计划项目(2021CYZC-31)
宁夏回族自治区自然科学基金项目(2023AAC03336)。
关键词
铜
铅
锌
复合污染体系
竞争吸附
二硫化碳
copper
lead
zinc
composite pollution system
competitive adsorption
carbon disulfide
