原位沉淀法制备氢氧化镁/硅藻土复合材料及其对甲基橙的吸附  

Preparation of magnesium hydroxide/diatomite composites by in-situ precipitation method and adsorption of methyl orange

作　　者：白晶 李刚 赵美 任海芳 贾莹光 吴浛 朱纪璇 BAI Jing;LI Gang;ZHAO Mei;REN Haifang;JIA Yingguang;WU Han;ZHU Jixuan(Liaoning Provincial Engineering Research Center for High-Value Utilization of Magnesite,Yingkou Institute of Technology,Yingkou 115004,Liaoning,China;Sheng Fujin(Yingkou)Material Science and Technology Co.,Ltd.,Yingkou 115004,Liaoning,China)

机构地区：[1]营口理工学院辽宁省菱镁矿高值利用工程研究中心,辽宁营口115004 [2]盛绂锦(营口)材料科技有限公司,辽宁营口115004

出　　处：《材料工程》2025年第4期187-193,共7页Journal of Materials Engineering

基　　金：辽宁省菱镁矿高值利用工程研究中心课题(LMNKY202308);辽宁省教育厅面上项目(JYTMS20230069);2024年度产教融合(产业学院)项目(110201013);辽宁省大学生创新创业项目(S202414435006);2023年营口理工学院校级一流本科课程(YL202311)。

摘　　要：针对经济发展过程中有机染料废水导致的环境污染问题,采用原位沉淀法制备氢氧化镁/硅藻土复合材料,以甲基橙为目标污染物研究其吸附性能,通过XRD,SEM,FT-IR和BET等检测方法对氢氧化镁/硅藻土复合材料进行表征,探索复合材料的投加量、初始pH值、目标污染物的初始浓度对甲基橙的吸附效果。结果表明,当氢氧化镁/硅藻土投加量为0.5 g,pH值为8,甲基橙浓度为8 mg/L时吸附效果最好,复合材料的吸附率达到93.34%,相比改性硅藻土的吸附率提升了41.34%。以吸附动力学模型、等温吸附模型、吸附热力学模型来分析吸附过程,结果表明,吸附过程是自发吸热且熵变增加,符合Freundlich等温吸附模型和准二级动力学模型,以化学吸附为主。该复合材料在循环验证实验中显示出良好的重复利用性。In view of the environmental pollution caused by organic dye wastewater in the process of economic development,magnesium hydroxide/diatomite composites are prepared by the in-situ precipitation method,and their adsorption performance is studied with methyl orange as the target pollutant.The magnesium hydroxide/diatomite composites are characterized by XRD,SEM,FT-IR and BET.The adsorption effects of the dosage,initial pH value,and initial concentration of the target pollutant on methyl orange are explored.The results show that the adsorption effect is the best when the dosage of magnesium hydroxide/diatomite is 0.5 g,the pH value is 8,and the concentration of methyl orange is 8 mg/L,and the adsorption rate of the composite reaches 93.34%.Compared with modified diatomite,the adsorption rate increases by 41.34%.The adsorption kinetics model,isothermal adsorption model,and adsorption thermodynamic model are used to analyze the adsorption process.The results show that the adsorption process is spontaneous endothermic and entropy-increasing,which conforms to the Freundlich isothermal adsorption model and quasi-second-order kinetic model,with chemical adsorption as the main mechanism.The composite material shows good reusability in cyclic verification experiments.

关 键 词：氢氧化镁/硅藻土复合材料 改性 吸附 甲基橙 

分 类 号：TQ424.2[化学工程] X754[环境科学与工程—环境工程] TB33[一般工业技术—材料科学与工程]