NaOH–ball-milled co-modified magnetic biochar and its oil adsorption properties

作     者：Zehua Wei Haihong Li Miaomiao Jia Ting Lin Zehua Wei;Haihong Li;Miaomiao Jia;Ting Lin

作者机构：School of Environmental and Chemical EngineeringXi'an Polytechnic UniversityXi'an710048China 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2023年第83卷第12期

页      面：40-49页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：This work was financially supported by the National Natural Science Fund of China(No.42007415) the Natural Science Foundation of Shaanxi Province(No.2020SF-435) 

主　　题：Biochar Oil pollution Adsorptionproperties Modificationmechanism 

摘      要：A magnetic biochar adsorbent(BM–OH–BC)was prepared through NaOH–ball milling co-modification with walnut shells as the raw material,and its oil adsorption characteristics were *** adsorption properties of oil pollutants were compared before and after the NaOH-ball-milling co-modification,and the mechanism of NaOH-ball-milling on oil pollutants was investigated by scanning electron microscope-energy dispersive X-ray spectroscopy,BET,X-ray photoelectron spectroscopy and Fourier transform infrared *** experimental results showed that the oil adsorption capacity of BM–OH–BC can reach 2.75 g/g,which is 129%higher than that of unmodified ***,after five adsorption and desorption cycles,the adsorption rate of BM–OH–BC only decreased by 5.9%,which was because the oil adsorption of BM–OH–BC is mainly chemical *** adsorption processes involving single layer,heterogeneous phase and multilayer made BM–OH–BC have excellent adsorption *** biochar co-modification,the specific surface area of BM–OH–BC increased to 466 m^(2)/g,the total pore volume increased to 0.245 cm^(3)/g,the average pore size decreased to1.90 nm,and the number of hydrophobic non-polar functional groups increased,leading to the enhancement of its oil absorption *** study provides a reference for the treatment of oil-contaminated water bodies.