Adsorption and mechanistic study of the invasive plant-derived biochar functionalized with CaAl-LDH for Eu(Ⅲ) in water

作     者：Shengbo Li Lijia Dong Zuofu Wei Guodong Sheng Kui Du Baowei Hu Shengbo Li;Lijia Dong;Zuofu Wei;Guodong Sheng;Kui Du;Baowei Hu

作者机构：School of Life ScienceSchool of Chernistry and Chemical EngineeringShaoxing UniversityShaoxing 312000China School of Life ScienceShanxi Normal UniuersityLinfen 041004China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2020年第32卷第10期

页      面：127-137页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：supported by the National Nature Science Foundation of China (Nos.31700476 21777102)。 

主　　题：Invasive plants Biochar LDH Europium sorption 

摘      要：Herein,we developed the invasive plant-derived biochar (IPB) functionalized with CaAl-LDH at five mass ratios using a physical mixture method,assessed their adsorption perform for Eu(Ⅲ),and explored the relative mechanisms.Results show that the IPB successfully loaded CaAl-LDH in five composites and their Eu(Ⅲ) sorption affinities were strongly affected by solution p H,contact time,temperature,and the mass ratio of LDH and IPB.All the sorpiton process for Eu(Ⅲ) occurred on the heterogeneous surface of five composites and the boundary layer diffusion limited the chemical sorption rate.Interestingly,the CaAl-LDH/IPB composite with high ratio of IPB had higher sorption capacity than the one with high ratio of LDH due to larger porosity of the former.Three mechanisms containing ion exchange between Al and Eu ions,surface complexation with carboxyl-and oxygen-containing functional groups,and precipitation were involved in the Eu(Ⅲ) sorption,but the dominant sorption mechanism for each CaAl-LDH/IPB composite differed with different mass ratio of CaAl-LDH and IPB.In composite with more IPB (e.g.,CaAl-LDH/IPB-13),both ion exchange and surface complexes dominated the sorption process and the intensity of Eu^3+ was identified with the one of Eu2O3.Whereas in composites with high LDH,ion exchange dominated the sorption and the intensity of Eu^3+ was obviously higher than the one of Eu_2O_3.This research will provide a new perspective for the application of the LDH/biochar materials.