高锰酸钾改性球形中孔炭的甲醛吸附性能  

Formaldehyde adsorption performance of KMnO_4 modified mesoporous carbon spheres

作　　者：蒋昕楠 孔振凯 王际童[1] 乔文明[1,2] 凌立成[1] JIANG Xinnan;KONG Zhenkai;WANG Jitong;QIAO Wenming;LING Licheng(State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;Key Laboratory of Specially Functional Polymeric Materials and Related Technology, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China)

机构地区：[1]华东理工大学化学工程联合国家重点实验室,上海200237 [2]华东理工大学特种功能高分子材料及相关技术教育部重点实验室,上海200237

出　　处：《环境工程学报》2018年第6期1676-1682,共7页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(U1710252;21506061);中国科协青年人才托举工程和上海市青年科技启明星计划(17QB1401700)

摘　　要：采用球形中孔炭为载体,通过浸渍法担载高锰酸钾(KMnO_4)制备高容量甲醛吸附剂。通过低温氮气吸附法、扫描电镜(SEM)、X射线光电子能谱(XPS)表征了球形中孔炭的孔结构及表面化学,并采用固定床测试了相应的球形中孔炭的动态甲醛吸附性能。实验结果表明:经过KMnO_4浸渍改性后,球形中孔炭保持良好的球形度,并保留一定的比表面积和孔容,有利于甲醛的扩散以及甲醛与吸附活性位的接触;同时,表面C—O、C=O等含氧官能团数量增加,有效提高了甲醛的吸附性能。在KMnO_4浓度为30%时性能最佳,吸附穿透容量和饱和容量分别为30.55 mg·g-1和66.04 mg·g-1,是未改性球形中孔炭的5.2倍和3.4倍。因此,KMnO_4改性是提升球形中孔炭甲醛吸附性能的有效手段。Mesoporous carbon spheres（MCS） was prepared and modified with potassium permanganate（KMnO4）solution by impregnation to achieve formaldehyde（HCHO） adsorbent with high adsorption capacity. The porous structure, morphology and surface chemistry of the samples were characterized by N2 adsorption（77 K）, scanning electron microscope（SEM）, and X-ray photoelectron spectroscopy（XPS）, respectively. And the performance of HCHO adsorption was tested in a fixed-bed reactor. Results indicated that modified MCS still provided a good sphericity and maintained the considerable porosity and the accessibility of interfacial area, being favorable for HCHO diffusion and adsorption. Meanwhile, the number of functional groups such as C—O and C=O on the surface of modified MCS increased, which effectively enhanced the adsorption performance to HCHO. The modified MCS with 30% KMnO4 gave the highest adsorption capacity with the breakthrough capacity of 30.55 mg·g^-1 and the saturation capacity of 66.04 mg·g^-1, which are 4.2 and 2.4 times higher than those of MCS without KMnO4 treatment.So, KMnO4 modification is a promising method to promote the adsorption performance of MCS to HCHO.

关 键 词：球形中孔炭 甲醛 吸附 改性 

分 类 号：X511[环境科学与工程—环境工程]