摘要
先采用化学沉淀/煅烧法制备Mn_(3)O_(4),再采用水解法制备Mn_(3)O_(4)/SiO_(2)磁性复合材料,并用于对亚甲基蓝(MB)的吸附。Mn_(3)O_(4)/SiO_(2)的表征结果表明,Mn_(3)O_(4)/SiO_(2)为多孔的核壳结构,BET比表面积达到184.3 m^(2)/g。Mn_(3)O_(4)/SiO_(2)对MB的吸附过程符合Langmuir吸附等温方程和准二级动力学方程,符合单分子层化学吸附理论,且为吸热、自发过程。在25℃、300 r/min、MB的初始质量浓度为50 mg/L、初始pH为7、Mn_(3)O_(4)/SiO_(2)添加量为2.00 g/L的条件下,MB脱除率可以达到90.23%。Mn_(3)O_(4)/SiO_(2)经过6次回收与循环利用后,其平衡吸附量仍能达到首次平衡吸附量的87.53%,具有较好的可再生性,在印染废水处理方面具有潜在应用前景。
Mn_(3)O_(4) was prepared by chemical precipitation-calcination method,and then Mn_(3)O_(4)/SiO_(2) magnetic composite was prepared by hydrolysis method.The prepared Mn_(3)O_(4)/SiO_(2) was applied for methylene blue(MB)adsorption.Mn_(3)O_(4)/SiO_(2) was characterized and found that Mn_(3)O_(4)/SiO_(2) was of core-shell structure and porous structure.The BET specific surface area of Mn_(3)O_(4)/SiO_(2) reached 184.3 m^(2)/g.The adsorption process fit Langmuir isothermal equation and pseudo-second-order kinetics equation,which implied monomolecular-layer chemical adsorption with a spontaneous endothermic process.Under 25℃,300 r/min,MB initial mass concentration of 50 mg/L,initial pH of 7 and Mn_(3)O_(4)/SiO_(2) dosage of 2.00 g/L,MB removal rate could reach 90.23%.The equilibrium adsorption amount of Mn_(3)O_(4)/SiO_(2) kept 87.53%of the original equilibrium adsorption amount after using for 6 times,which indicated a good renewability and a potential application prospect in printing and dyeing wastewater treatment.
作者
罗忆婷
陈锦华
向延鸿
刘嘉琪
刘志雄
刘雯
王力宏
LUO Yiting;CHEN Jinhua;XIANG Yanhong;LIU Jiaqi;LIU Zhixiong;LIU Wen;WANG Lihong(College of Physics and Mechanical&Electrical Engineering,Jishou University,Xiangxi Hunan 416000;Collaborative Innovation Center of Manganese-Zinc-Vanadium Industrial Technology(the 2011 Plan of Hunan Province),Jishou University,Xiangxi Hunan 416000;College of Biology and Environmental Sciences,Jishou University,Xiangxi Hunan 416000;Hunan Province Key Laboratory of Mineral Cleaner Production and Green Functional Materials,Xiangxi Hunan 416000)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2022年第3期317-323,共7页
Environmental Pollution & Control
基金
湖南省自然科学基金资助项目(No.2020JJ4507、No.2020JJ5456)
国家级大学生创新创业训练计划项目(No.S202010531026)
湖南省大学生创新创业训练计划项目(No.20202986)
吉首大学湖南省2011计划锰锌钒产业技术协同创新中心开放基金资助项目(No.MXF201934)
矿物清洁生产与绿色功能材料开发湖南省重点实验室开放基金资助项目(No.KWCL202001)。
