Mg(NO_(3))_(2)·6H_(2O)-Assisted insitu-Fabrication of Tea Residual Biochar for Ultra-Fast and High Adsorption of Rhodamine B

作     者：HU Dandan XUE Yangfan LIU Bo WU Yongjuan LI Zichen HU Dandan;XUE Yangfan;LIU Bo;WU Yongjuan;LI Zichen

作者机构：School of Chemistry&Chemical EngineeringShaanxi Xueqian Normal UniversityXi'an 710100ShaanxiChina Safe CollegeXi􀆳an University of Science and TechnologyXi'an 710054ShaanxiChina 

出 版 物：《Wuhan University Journal of Natural Sciences》 (武汉大学学报（自然科学英文版）)

年 卷 期：2024年第29卷第2期

页      面：165-176页

核心收录：

学科分类：08[工学] 0815[工学-水利工程] 

基　　金：Supported by the Innovation and Entrepreneurship Plan Project of Shaanxi Province and Shaanxi Xueqian Normal University for College Students(S202314390048 2023DC048)。 

主　　题：Mg(NO_(3))_(2)·6H_(2)O porous biochar mechanism rhodamine B adsorption 

摘      要：In this work,porous biochar(MN-TRB_(750))was fabricated via direct pyrolysis of tea residue(TR)and Mg(NO_(3))_(2)·6H_(2)O(MN).The as-synthesized MN-TRB_(750) reached a specific surface area of 839.54 m^(2)·g^(-1)and an average pore size of 3.75 nm with multi-level pore architecture.MN decreased TR s carbonization temperature and promoted the aromatics extent,pore structure for the frizzly flake-like biochar.Rhodamine B(RhB)was chosen as the adsorbate to explore the removal performance of organic dyes in this study.The results indicated that the maximum adsorption capacity of RhB on MN-TRB_(750) at 20℃ is up to 809.0 mg·g^(-1)with isotherms fitted well to Freundlich and Dubinin-Radushkevic models.The adsorption kinetics followed pseudo-second-order and Elovich models with an equilibrium adsorption capacity of 757.6 mg·g^(-1)as the initial concentration of RhB is 260 mg·L^(-1).High pore filling,hydrogen bond,π-πinteraction determined the adsorption of RhB onto MN-TRB850 through a multi-active center and exothermic chemical sorption process.