Controlled synthesis of Zeolite adsorbent from lowgrade diatomite:A case study of self-assembled sodalite microspheres  

作　　者：Lingmin Sun Junshu Wu Jinshu Wang Gong Yu Jingchao Liu Yucheng Du Yongli Li Hongyi Li 

机构地区：[1]The Key Lab of Advanced Functional Materials,Ministry of Education China,School of Materials Science and Engineering,Beijing University of Technology,Beijing 100022,China [2]Baishan Institute of Science and Technology,Baishan,Jilin 134300,China

出　　处：《Journal of Environmental Sciences》2020年第5期92-104,共13页环境科学学报（英文版）

基　　金：supported by the National Key R&D Program of China(No.2017YFB0310804);the Scientific and Technological Developing Scheme of Jilin Province(No.20190303119SF);the National Natural Science Foundation of China(No.51974011);the Key R&D Program of Ningxia Hui Autonomous Region(No.2019BFG02032)

摘　　要：Highly efficient and sustainable conversion technologies to generate uniform sodalite(Na8(AlSiO4)6(OH)2)zeolite micro spheres with low-grade waste natural diatomite as raw materials via a solution-mediated crystallization route were developed in the present study.The synthesis process can be considered as an in-situ zeolitization of diatomite precursor without involving any me so scale template and any post-synthetic modification.The mass ratios of diatomite and AlCl3·6 H2 O have remarkable effect on the morphology,crystal structure and porosity of sodalite zeolite product.The preferred sodalite microspheres with uniform mesoporous of size 3.5-5.5 nm and large surface area of 162.5 m2/g exhibit well removal performance for heavy metal ions(Pb(II),Cd(II),Zn(II),and Cu(II)),with the highest adsorption abilities for Pb(II)ions of 365 mg/g.In addition,the effect of contact time,initial ion concentration,competitive adsorption and solution pH were evaluated.The removal performance results from synergistic effects of dominating cation-exchange and additional surface chemisorption.The study may broadly help unveil chemical control reactions of the zeolitization processes of diatomite,and thus facilitates the development of promising zeolite materials for the use in natural and engineered aquatic environments by recvcling waste diatomite resources.

关 键 词：DIATOMITE ZEOLITE Ion exchange 

分 类 号：X703[环境科学与工程—环境工程] TQ424[化学工程]