MoS_2-PAN吸附膜对铜离子的吸附性能影响规律
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摘要
利用聚丙烯腈(PAN)为基膜、硫化钼(MoS_2)为改性剂制备MoS_2-PAN有机-无机复合膜。利用PAN基膜对重金属离子进行选择性、PAN固含量以及温度因素进行吸附性能实验,并通过SEM、FTIR进行表征。在此条件下,通过添加MoS_2提高吸附膜材料对Cu~(2+)的吸附能力,分别改变MoS_2固含量、p H值、温度、反应时间得到最优吸附量,并通过动力学拟合曲线、等温吸附模型以及热力学模型确定反应机理,并通过解吸实验考察吸附膜解吸再生效应。结果表明:在温度为30℃,p H=6的条件下添加MoS_21wt%对Cu~(2+)吸附180 min吸附性能达到最优,Langmuir等温吸附模型更符合该吸附过程,准二级动力学模型更符合该吸附的动力学过程。吸附是一个自发的吸热过程。
MoS_2-PAN organic-inorganic composite membrane was prepared by using polyacrylonitrile( PAN) as base membrane and molybdenum sulfide( MoS_2) as modifier. The selectivity of heavy metal ions,the solid content of PAN and the temperature factors were studied by using PAN-based membrane,and characterized by SEM and FTIR. The optimum adsorption capacity was obtained by changing the solid content,p H value,temperature and reaction time of MoS_2. The mechanism was determined by kinetic fitting curve,isothermal adsorption model and thermodynamic model. The desorption and regeneration efficiency of adsorption membrane was investigated by desorption experiment. The adsorption mechanism should be discussed. The results show that MoS_21 wt% has the best adsorption performance for Cu~(2+) for 180 min at 30 ℃and pH = 6. Langmuir isothermal adsorption model is more in line with the adsorption process,and quasi-second-order kinetic model is more in line with the adsorption kinetic process. Adsorption is a spontaneous endothermic process.
MoS_2-PAN organic-inorganic composite membrane was prepared by using polyacrylonitrile( PAN) as base membrane and molybdenum sulfide( MoS_2) as modifier. The selectivity of heavy metal ions,the solid content of PAN and the temperature factors were studied by using PAN-based membrane,and characterized by SEM and FTIR. The optimum adsorption capacity was obtained by changing the solid content,p H value,temperature and reaction time of MoS_2. The mechanism was determined by kinetic fitting curve,isothermal adsorption model and thermodynamic model. The desorption and regeneration efficiency of adsorption membrane was investigated by desorption experiment. The adsorption mechanism should be discussed. The results show that MoS_21 wt% has the best adsorption performance for Cu~(2+) for 180 min at 30 ℃and pH = 6. Langmuir isothermal adsorption model is more in line with the adsorption process,and quasi-second-order kinetic model is more in line with the adsorption kinetic process. Adsorption is a spontaneous endothermic process.
引文
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[3] Salman M,Athar M,Farooq U. Biosorption of heavy metals from aqueous solutions using indigenous and modified lignocellulosic materials[J].Reviews in Environmental Science and Bio/Technology,2015,14(2):211-228.
[4] Cao D,Song X,Fang X,et al. Membrane filtration-based recovery of extracellular polymer substances from excess sludge and analysis of their heavy metal ion adsorption properties[J]. Chemical Engineering Journal,2018,15(354):866-874.
[5] Vesna K,Tamara U,Branka P,et al. A review on adsorbents for treatment of water and wastewaters containing copper ions[J]. Chemical Engineering Science,2018,31(192):273-287.
[6] Ali A N,Mohammad A,Majid R. Highly efficient removal of cd(ii)ions by composite of go and layered double hydroxide composite[J].Materuals Research Express,2018,6(1):1-27.
[7] Wang X Y,Wang T,Ma J,et al. Synthesis and characterization of a new hydrophilic boehmite-pvb/pvdf blended membrane supported nano zerovalent iron for remov[J]. Separation and Purification Technology,2018,31(205):74-83.
[8] Ong D C,Pingul-Ong S M B,Kan C C,et al. Removal of nickel ions from aqueous solutions by manganese dioxide derived from groundwater treatment sludge[J]. Journal of Cleaner Production,2018,190(C):443-451.
[9]康勇,余纪成,鲁佳,等.纳滤膜深度处理火电厂脱硫废水实验[J].热力发电,2017(7):12-19.
[10] Yin N,Zhong Z,Xing W. Ceramic membrane fouling and cleaning in ultrafiltration of desulfurization wastewater[J]. Desalination,2013,319(10):92-98.
[11]鲍宇姣.武安电厂全膜法水处理工艺的应用及设计优化[D].北京:华北电力大学,2016.
[12] Zhang M,Jia F,Dai M,et al. Combined electrosorption and chemisorption of low concentration pb(ii)from aqueous solutions with molybdenum disulfide as electrode[J]. Applied Surface Science,2018,455:258-266.
[13] Wang Z Y,Alison S,Jeffrey J,et al. Urban removal and recovery of heavy metal ions by two-dimensional Mo S2nanosheets:performance and mechanisms[J]. Environmental Science&Technology,2018,52(17):9741-9748.
[14] Javad Z,Mahdieh R. Multivariate optimization and characterization of simultaneous removal of binary mixture of Cu(II)and Pb(II)using Fe3O4@Mo S2nanoparticles[J]. Journal of Chemometrics,2018,32(9):1-19.
[15] Pei H,Wang J,Yang Q,et al. Interfacial growth of nitrogen-doped carbon with multi-functional groups on the Mo S2,skeleton for efficient Pb(II)removal[J]. Science of The Total Environment,2018,631-632:912-920.
[16]徐海燕.二硫化钼纳米片的制备及其吸附性能的研究[D].重庆:重庆大学,2014.
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