文献类型：期刊文献

英文题名：Smart construction of mesoporous carbon templated hierarchical Mg-Al and Ni-Al layered double hydroxides for remarkably enhanced U(VI) management

作者：Yin, Ling[1,2];Hu, Yezi[1];Ma, Ran[1];Wen, Tao[1];Wang, Xiangxue[1];Hu, Baowei[2];Yu, Zhimin[3];Hayat, Tasawar[4];Alsaedi, Ahmed[4];Wang, Xiangke[1]

机构：[1]North China Elect Power Univ, Coll Environm Sci & Engn, MOE Key Lab Resources & Environm Syst Optimizat, Beijing 102206, Peoples R China;[2]Shaoxing Univ, Sch Life Sci, Huancheng West Rd 508, Shaoxing 312000, Peoples R China;[3]Hefei Univ, Dept Biol & Environm Engn, Hefei 230000, Anhui, Peoples R China;[4]King Abdulaziz Univ, NAAM Res Grp, Fac Sci, Jeddah 21589, Saudi Arabia

年份：2019

卷号：359

起止页码：1550

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：SCI-EXPANDED(收录号：WOS:000454137400149)、、EI(收录号：20184506043992)、Scopus(收录号：2-s2.0-85055969644)、WOS

基金：Supporting from the National Key Research and Development Program of China (2017YFA0207002), the Fundamental Research Funding of Central Universities (2018MS114, 2017MS045, 2018ZD11), NSFC (21607042, 21707033, 21577032) was acknowledged.

语种：英文

外文关键词：Layered double hydroxides; CMK-3; SBA-15; U(VI); Hierarchical structure; Adsorption

外文摘要：Designing and fabricating environmental friendly adsorbents with more accessible active sites and higher specific surface area for achieving rapid kinetics and high efficiency have become an impending challenge in radionuclides' pollution remediation. To overcome these issues, we rationally designed the hierarchical structured layered double hydroxides with mesoporous carbon template (CMK-3@LDHs) by in situ hydrothermal method. The adsorption data could be well simulated with pseudo-second-order and Langmuir model, and the results indicated that the CMK-3@LDHs exhibited higher adsorption capacities (171 mg . g(-1) for CMK-3@Mg-Al LDHs and 301 mg . g(-1) for CMK-3@ Ni-Al LDHs at pH = 5.0) and more rapid kinetics (achieved equilibrium within 30 min) than SBA-15@LDHs towards U(VI). The kinetic model simulation demonstrated that the adsorption rate was dominated by intra-particle and film diffusion models simultaneously. In addition, the interaction between U(VI) and LDHs was pH-dependent and weakly related with ionic strength at pH < 5, suggesting that the process was mainly driven by the combined mechanism of electrostatic interaction and innersphere surface complexation. The characterization indicated that U(VI) removal was predominately controlled by isomorphic substitution and complexation with surface hydroxyl groups. In the further simulation experiments, the CMK-3@LDHs exhibited relative high adsorption efficiency in many water systems even in seawater, which confirmed the potential application of CMK-3@LDHs in efficient extraction and remediation of radio-nuclides from different kinds of wastewater systems.