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  • 史琳,叶倩玲,杨琦,刘兆香.UiO-66/氧化石墨烯的制备及对水中四氯化碳的吸附[J].环境工程学报,2019,13(5):1063-1072.DOI:10.12030/j.cjee.201810060    [点击复制]
  • SHI Lin,YE Qianling,YANG Qi,LIU Zhaoxiang.Absorption of carbon tetrachloride from aqueous solution by synthesized UiO-66/graphene oxide[J].,2019,13(5):1063-1072.DOI:10.12030/j.cjee.201810060   [点击复制]
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UiO-66/氧化石墨烯的制备及对水中四氯化碳的吸附
史琳1,2,叶倩玲1,2,杨琦1,2,刘兆香3
0
(1.中国地质大学(北京),水资源与环境工程北京市重点实验室,北京 100083;2.中国地质大学(北京),地下水循环与环境演化教育部重点实验室,北京 100083;3.环境保护部,环境保护对外合作中心,北京 100035)
摘要:
采用溶剂热法制备了UiO-66和UiO-66/氧化石墨烯复合材料;以水中四氯化碳为处理对象,研究了吸附时间、污染物浓度及温度等因素对吸附过程的影响,并对吸附过程进行动力学和热力学模拟探讨。结果表明,当四氯化碳浓度为10 mg·L-1、30 ℃时,吸附反应在6 h达到平衡,四氯化碳的去除率为87.5%。UiO-66/氧化石墨烯材料对四氯化碳的吸附过程符合拟二级动力学模型。热力学结果显示ΔG<0、ΔH>0、ΔS>0,由此判断吸附过程是自发、吸热和熵增加的过程。UiO-66/氧化石墨烯材料中比表面积、表面分散力和晶体缺陷的增加使其对四氯化碳具有更好的吸附性能。
关键词:  四氯化碳  UiO-66/氧化石墨烯  吸附
DOI:10.12030/j.cjee.201810060
投稿时间:2018-10-12
基金项目:北京市产学研项目51900265005;国家科技重大专项2009ZX07207-008,2009ZX07419-002,2009ZX07207-001,2015ZX07406005-001;中央高校基本科研业务费专项资金2652013101,2652013086,2652013087;国家重大科学仪器设备开发专项2012YQ060115北京市产学研项目(51900265005);国家科技重大专项(2009ZX07207-008,2009ZX07419-002,2009ZX07207-001,2015ZX07406005-001);中央高校基本科研业务费专项资金(2652013101,2652013086,2652013087);国家重大科学仪器设备开发专项(2012YQ060115)
Absorption of carbon tetrachloride from aqueous solution by synthesized UiO-66/graphene oxide
SHI Lin1,2,YE Qianling1,2,YANG Qi1,2,LIU Zhaoxiang3
(1.Beijing Key Laboratory of Water Resource & Environmental Engineering, China University of Geoscience (Beijing), Beijing 100083, China;2.Key Laboratory of Groundwater Circulation and Environmental Evolution, Ministry of Education, China University of Geoscience (Beijing), Beijing 100083, China;3.Foreign Economic Cooperation Office, Ministry of Environmental Protection, Beijing 100035, China)
Abstract:
Nano-sized metal organic framework UiO-66 and UiO-66/graphene oxide composites were prepared using a microwave-assisted solvothermal method. Influences of several parameters, such as time, carbon tetrachloride concentration, and temperature, on the carbon tetrachloride adsorption by UiO-66/graphene oxide composites were investigated. Meanwhile, adsorption kinetics and thermodynamics were also explored. Results showed that the adsorption equilibrium occurred within 6 hours and the removal efficiency of carbon tetrachloride was 87.5% at its initial concentration of 10 mg·L-1 and 30 ℃. A pseudo-second order kinetic model fitted well with the adsorption kinetic process. The negative value of ΔG and positive values of ΔH and ΔS determined through thermodynamics of adsorption indicated that the adsorption was a spontaneous, endothermic and entropy increase process. The adsorption effect of carbon tetrachloride on the UiO-66/GrO was better than UiO-66 owing to the increasing of specific area, dispersion forces and defects on the crystal surface.
Key words:  carbon tetrachloride  UiO-66/graphene oxide  adsorption