低温干馏椰壳活性炭对苯气体的吸附研究  

Study on adsorption of benzene gas on activatedcarbon prepared by low temperature carbonization

作　　者：闫高俊 宋志伟 杨治广 刘雪平[2] 白志辉 YAN Gao-jun;SONG Zhi-wei;YANG Zhi-guang;LIU Xue-ping;BAI Zhi-hui(School of Environment and Chemical Engineering,Heilongjiang University of Science and Technology,Harbin 150027,China;Henan Province Key Laboratory of Water Pollution Control and Rehabilitation Technology,Henan University of Urban Construction,Pingdingshan 467036,China;Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China)

机构地区：[1]黑龙江科技大学环境与化工学院,黑龙江哈尔滨150027 [2]河南城建学院河南省水体污染防治与修复重点实验室,河南平顶山467036 [3]中国科学院生态环境研究中心,北京100085

出　　处：《应用化工》2021年第9期2432-2434,2439,共4页Applied Chemical Industry

基　　金：中国科学院前沿科学重点研究项目(QYZDB-SSW-DQC026)。

摘　　要：以椰壳为原料,经过低温干馏、活化,制备了椰壳活性炭。以苯作为吸附质,对制备的椰壳活性炭进行了吸附实验,探索温度对椰壳活性炭吸附性能的影响以及活性炭微观吸附机制,采用比表面积及孔径对椰壳活性炭进行了表征。结果表明,30℃时所制备的活性炭对苯的饱和吸附量为437.0 mg/g,合适的再生温度为150℃。所制备的椰壳活性炭最大比表面积为1860 m^(2)/g,BJH孔径为48 nm。吸附曲线表明,椰壳活性炭吸附属于BDDT分类中的Ⅱ型;在温度(T)<40℃或压力(P/P_(0))>0.5时,椰壳活性炭对非极性苯分子的吸附类型由初始的单分子层吸附转变为多分子层与毛细管凝聚相结合的物理吸附,有利于提高活性炭对苯的吸附效果。Coconut shell activated carbon was prepared from coconut shell by low temperature carbonization and activation.Coconut shell activated carbon was selected as adsorbent,and benzene as adsorbate.The effect of temperature on the adsorption performance and the micro adsorption mechanism of activated carbon were explored.Coconut shell activated carbon was characterized by specific surface area and pore size.The result showed that the saturated adsorption capacity of the prepared activated carbon for benzene at 30℃was 437.0 mg/g,and the appropriate regeneration temperature was 150℃.The maximum specific surface area of the prepared coconut shell activated carbon was 1860 m^(2)/g,and the pore size of BJH was 48 nm.The adsorption curve indicated that the adsorption of coconut shell activated carbon belongs to typeⅡin BDDT classification.When the temperature is less than 40℃or the pressure P/P_(0) is more than 0.5,the adsorption capacity of coconut shell activated carbon for non-polar benzene molecules increases rapidly with the adsorption amount.In addition,the adsorption type changes from the initial single molecular layer adsorption to the physical adsorption which combines the multi molecular layer with the capillary condensation,it is benefical to improve to the adsorption effect of activated carbon on benzene.

关 键 词：活性炭 吸附 苯 比表面积 

分 类 号：TQ424.1[化学工程] X701.1[环境科学与工程—环境工程]