混合金属氧化物/碳复合材料的制备及其对Pb(Ⅱ)的吸附性能  

Preparation of Mixed Metal Oxide/Carbon Composites and Its Adsorption Performance for Pb(Ⅱ)

作　　者：卢予沈 宗莉[1] 于惠 牟斌[1] 王爱勤[1,2] LU Yu-shen;ZONG Li;YU Hui;MU Bin;WANG Ai-qin(Key Laboratory of Clay Mineral Applied Research of Gansu Province,Center of Eco-Materials and Green Chemistry,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院兰州化学物理研究所甘肃省黏土矿物应用研究重点实验室,环境材料与生态化学研究发展中心,兰州730000 [2]中国科学院大学材料与光电研究中心,北京100049

出　　处：《环境科学》2021年第11期5450-5459,共10页Environmental Science

基　　金：国家自然科学基金项目(41601303);甘肃省自然科学基金重大项目(18JR4RA001)。

摘　　要：由金属离子及其类似物可控合成的层状双金属氢氧化物具有丰富的层间离子和表面官能团,因而在吸附方面得到了广泛研究,但吸附-脱附应用方式会对环境造成二次污染.将吸附刚果红的层状双金属氢氧化物通过煅烧碳化制备混合金属氧化物/碳复合材料,详细研究了对水溶液中重金属离子Pb(Ⅱ)的吸附性能.结果表明,混合金属氧化物/碳复合材料对Pb(Ⅱ)具有较快的吸附速率和较高的吸附容量.30 min内吸附量即可达到150 mg·g^(-1)以上,同时,其吸附量随层状双金属氢氧化物中引入Mg^(2+)含量的增加而增加,最大达到368 mg·g^(-1).混合金属氧化物/碳复合材料对Pb(Ⅱ)的去除机制主要是表面诱导生成难溶物Pb_(3)(CO_(3))_(2)(OH)_(2).研究结果为混合金属氧化物/碳复合材料对含铅土壤的修复奠定了应用基础.Layered double hydroxides,which can be synthesized from metal ions and their analogs,have abundant interlayer ions,surface functional groups,and adsorption characteristics that have been extensively studied.But the adsorption-desorption process may cause secondary pollution of the environment.In this study,the layered double hydroxides that adsorbed Congo red were converted into mixed metal oxide/carbon composites by a calcining carbonization method,and its adsorption performance for heavy metal ions Pb(Ⅱ)in aqueous solution was studied in detail.The results show that the prepared mixed metal oxide/carbon composites have a faster adsorption rate and higher adsorption capacity for Pb(Ⅱ).The adsorption capacity reached more than 150 mg·g^(-1)in 30 min,and increased with the content of Mg^(2+)introduced into the layered double metal hydroxide,reaching a maximum of 368 mg·g^(-1).The removal mechanism of Pb(Ⅱ)by mixed metal oxide/carbon composites was caused by the formation of insoluble Pb_(3)(CO_(3))_(2)(OH)_(2) on the surface.This research lays the foundation for the application of mixed metal oxide/carbon composites in the remediation of lead-containing soils.

关 键 词：混合金属氧化物 复合材料 吸附 Pb(Ⅱ) 吸附机制 

分 类 号：X703.1[环境科学与工程—环境工程]