茶渣修饰磁性Fe_3O_4纳米粒子协同吸附铜铅离子的研究  

Study on synergistic adsorption of copper and lead ions by magnetic Fe_3O_4 nanoparticles decorated by tea leaf

作　　者：唐跃武 江勇 杨英 苏光辰[1] 施海珊 张惠 TANG Yuewu;JIANG Yong;YANG Ying;SU Guangchen;SHI Haishan;ZHANG Hui(School of Environment and Energy Engineering,Anhui Jianzhu University,Hefei Anhui 230601;Key Laboratory of Anhui Province of Water Pollution Control and Wastewater Reuse,Anhui Jianzhu University,Hefei Anhui 230601)

机构地区：[1]安徽建筑大学环境与能源工程学院,安徽合肥230601 [2]安徽建筑大学水污染控制与废水资源化安徽省重点实验室,安徽合肥230601

出　　处：《环境污染与防治》2019年第1期60-66,共7页Environmental Pollution & Control

基　　金：安徽省教育厅自然科学研究重大项目(No.kj2015ZD12);国家水体污染控制与治理科技重大专项(No.2012ZX07103-001);安徽省科技重大项目(No.17030801028);安徽省重点研发计划项目(No.1704a0902009)

摘　　要：在茶渣上通过化学共沉淀制备环境友好、价格低廉的磁性纳米粒子Fe_3O_4-茶复合物。结果显示,茶渣修饰提高了磁性Fe_3O_4纳米粒子(Fe_3O_4MNPs)在水中的分散性和稳定性,促进了Fe_3O_4MNPs对水中重金属的去除能力;Cu(Ⅱ)和Pb(Ⅱ)的吸附归因于Fe_3O_4-茶复合物中丰富的结合位点(如—OH,—COOH和—NH—)与Cu(Ⅱ)和Pb(Ⅱ)形成稳定的络合物。在pH为7.0,Cu(Ⅱ)、Pb(Ⅱ)初始质量浓度为100mg/L,吸附时间为2h时,Fe_3O_4-茶复合物对Cu(Ⅱ)、Pb(Ⅱ)的吸附率分别为94.58%、94.28%;Cu(Ⅱ)、Pb(Ⅱ)的吸附过程符合准二级动力学方程,Fe_3O_4-茶复合物在连续4次循环再生后,仍表现出较好的吸附能力。利用柱吸附法考察了进液流速对穿透曲线的影响,结果表明:随进液流速增加,穿透点前移,且Cu(Ⅱ)的吸附能力低于Pb(Ⅱ)的吸附能力。An environmentally friendly and inexpensive magnetic nanoparticle Fe3O4-tea composite was prepared by chemical co-precipitation on tea leaf.The results showed that the tea modification improved the dispersibility and stability of magnetic Fe3O4 nanoparticles(Fe3O4 MNPs)in water,and promoted the removal of heavy metals from water by Fe3O4 MNPs.The adsorption of Cu(Ⅱ)and Pb(Ⅱ)was attributed to the abundant binding sites(such as-OH,-COOH and-NH-)in the Fe3O4-tea composite which could form stable complexes with Cu(Ⅱ)and Pb(Ⅱ).When the initial mass concentration of Cu(Ⅱ)and Pb(Ⅱ)was 100 mg/L at pH 7.0 and the adsorption time was 2 h,the adsorption rates of Fe3O4-tea composite on Cu(Ⅱ)and Pb(Ⅱ)were 94.58%and 94.28%,respectively.The adsorption process of Cu(Ⅱ)and Pb(Ⅱ)accorded with the quasi-second-order kinetics equation,and Fe3O4-tea composite still exhibited high adsorption capacity after 4 cycles of regeneration.The effect of the inlet flow rate on the breakthrough curve was investigated by column adsorption method.The results showed that the penetration point advanced with the increase of the inlet flow rate,and the adsorption capacity of Cu(Ⅱ)was lower than that of Pb(Ⅱ).

关 键 词：磁性FE3O4纳米粒子 Fe3O4-茶复合物 磁性材料 吸附 

分 类 号：X703[环境科学与工程—环境工程]