Fe Mn二元氧化物强化活性铝硅酸盐矿物对Tl(Ⅰ)的去除及其机制  

Removal of Tl(Ⅰ)by Active Aluminosilicate Mineral Enhanced by Fe-Mn Binary Oxide and Its Mechanism

作　　者：邹友琴[1,2] 李群 李卓悦 刘耀驰[3] 李勇丽 章萍[1,2] Zou Youqin;Li Qun;Li Zhuoyue;Liu Yaochi;Li Yongli;Zhang Ping(School of Resources,Environmental and Chemical Engineering,Nanchang University,Nanchang 330031,China;Key Laboratory of Poyang Lake Ecology and Bio-Resource Utilization(Nanchang University),Ministry of Education,Nanchang 330031,China;College of Chemistry and Chemical Engineering,Central South University,Changsha410083,China)

机构地区：[1]南昌大学资源环境与化学工程学院,南昌330031 [2]鄱阳湖生态与生物资源利用教育部重点实验室(南昌大学),南昌330031 [3]中南大学化学化工学院,长沙410083

出　　处：《吉林大学学报（地球科学版）》2022年第3期992-1003,共12页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(21767018);江西省学术带头人培养计划项目(20194BCJ22002);湖南省重点领域研发计划项目(2019WK_(2)031)。

摘　　要：铊(Tl)对哺乳动物具有高毒性,Tl(Ⅰ)是其在水中常见稳定易迁移形态,难于处理.本研究采用共沉淀法将Fe、Mn氧化物负载于活性铝硅酸盐矿物(AAM)制得Fe Mn二元氧化物复合活性铝硅酸盐(FMAAM),并将其应用于水中Tl(Ⅰ)的去除.通过批量试验,研究了FMAAM吸附剂用量、初始pH、离子浓度等因素对Tl(Ⅰ)去除的影响,并阐述了去除机制.结果表明:在120min时,FMAAM对Tl(Ⅰ)的吸附达到平衡,且在pH为3~9的条件下,FMAAM对Tl(Ⅰ)有较好的吸附效果,去除率都高于89.0%;FMAAM对Tl(Ⅰ)的吸附过程更符合Langmuir模型,其在293K(pH=7,1.00g/L)条件下,对Tl(Ⅰ)的最大吸附量为61.50mg/g.同时测定了FMAAM的比表面积(S_(BET))、平均孔径和总孔体积,其中,FMAAM的S_(BET)(36.830m^(2)/g)高于AAM的S_(BET)(0.165m^(2)/g),且相差200倍以上.根据X射线能谱(EDX)、傅里叶变换红外光谱(FTIR)和X射线光电子能谱(XPS)分析,FMAAM对Tl(Ⅰ)的吸附机理为离子交换、络合反应和氧化沉淀.Thallium is highly toxic to mammals.Tl(Ⅰ)is a common stable and migratory form in water,and hard to remove.In this study,Fe-Mn binary oxide composite active aluminosilicate mineral(FMAAM)was prepared via coprecipitation method by loading Fe and Mn oxides on active aluminosilicate mineral(AAM)and applied to Tl(Ⅰ)removal in water.The effects of the initial pH,ionic strength and FMAAM dosage as well as the removal mechanism of Tl(Ⅰ)were studied.The results showed that the adsorption of Tl(Ⅰ)by FMAAM reached its equilibrium at 120 min,and the removal rate was more than 89.0%at the solution pH range of 3-9.The adsorption process of Tl(Ⅰ)by FMAAM was more consistent with Langmuir model.The maximum adsorption capacity of Tl(Ⅰ)by FMAAM was 61.50 mg/g at 293 K(pH=7,a dosage of 1.00 g/L).The specific surface area(S_(BET)),average pore size and total pore volume of FMAAM were tested,which showed that the S_(BET) of FMAAM(36.830 m^(2)/g)was significantly higher than that of AMM(0.165 m^(2)/g),with a difference of more than 200 times.According to the analyses of energy-dispersive X-ray spectroscope(EDX),Fourier transform infrared spectroscopy(FTIR)and X-ray photoelectron spectroscopy(XPS),the adsorption mechanism of Tl(Ⅰ)by FMAAM is related to ion exchange,complexation reaction,and oxidation precipitation.

关 键 词：Fe Mn二元氧化物 铝硅酸盐矿物 铊 复合物 

分 类 号：X703[环境科学与工程—环境工程]