Mechanistic investigation on Hg^(0) capture over MnO_(x) adsorbents:effects of the synthesis methods

作     者：Dong YE Yongjin HU Zhichang JIANG Xin LIU Haining WANG Dong YE;Yongjin HU;Zhichang JIANG;Xin LIU;Haining WANG

作者机构：College of Quality&Safety EngineeringChina Jiliang UniversityHangzhou 310018China 

出 版 物：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 (浙江大学学报（英文版）A辑（应用物理与工程）)

年 卷 期：2023年第24卷第1期

页      面：80-90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：This work is supported by the Fundamental Research Funds of China Jiliang University and the Zhejiang Provincial Natural Science Foundation of China(No.LQ22E060003) 

主　　题：Synthesis methods Hg^(0)capture MnO_(x) Acidity O_(x)idative ability 

摘      要：This study demonstrated the impacts of the synthesis methods on the textural structures,chemical properties,and Hg^(0)capture capability of the MnO_(x)*** with the samples synthesized using the precipitation(PR)and hydrothermal(HT)methods,the adsorbent prepared via the sol-gel(SG)technique gave the best *** 150℃,ca.90%Hg^(0)removal efficiency was reached after 7.5 h for MnO_(x)prepared by the SG method,ca.40%higher than that of the other two *** specific surface area of the adsorbent synthesized via the SG technique(23 m^(2)/g)was almost double that of the adsorbent prepared by the HT method(12 m^(2)/g)and three times that of the one prepared by the PR method(7 m^(2)/g).The presence of plentiful acid sites from the SG method facilitated the physisorption of Hg^(0),making more Hg^(0)available to be oxidized to HgO by the redox sites and thus giving the adsorbent prepared by the SG method the highest Hg^(0)removal *** strong oxidative ability accelerated the oxidation of the physically adsorbed Hg^(0)to HgO,which explained the higher Hg^(0)removal efficiency of the sample prepared using the HT method than that of the one synthesized by the PR *** the whole Hg^(0)removal cycles,chemisorption dominated,with the initial adsorption stage and the external mass-transfer process playing important roles.