MoS_2纳米片去除水中Cr(Ⅵ)的吸附性能和机理
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摘要
采用简单的一步水热法合成了薄片状纳米MoS_2并将其用于吸附去除水中Cr(Ⅵ)。片状MoS_2对Cr(Ⅵ)具有非常好的吸附效果,反应不到160min就达到了吸附平衡,Cr(Ⅵ)的去除率可达97%。Cr(Ⅵ)在MoS_2上的表面吸附是自发吸热的化学吸附过程,反应速率主要由扩散速率控制。其反应动力学符合准二级动力学模型,由Langmuir等温线计算的最大平衡吸附量为36.22mg·g~(-1)。实验结果表明MoS_2纳米片是一种优良的金属离子吸附剂。
MoS_2 nano-sheets,fabricated by a facile hydrothermal synthesis,was used for Cr(Ⅵ)removal from contaminate water.The removal efficiency of MoS_2 for Cr(Ⅵ)was 97% in no more than 160 min and the maximum adsorption capacity was 36.22 mg·g~(-1).The investigation on adsorption kinetics and isotherm showed that the pseudo-second-order kinetic and Langmuir isotherm models could well fit the adsorption experimental process.Adsorption thermodynamics investigation proved that the Cr(Ⅵ)adsorption on the surface of MoS_2 was a spontaneous endothermic physic-chemical process,in which the rate of adsorption was controlled by exterior surface diffusion step.It illustrated that MoS_2 nano-sheets can be used as excellent adsorbent for heavy metal ions removal from wastewater.
MoS_2 nano-sheets,fabricated by a facile hydrothermal synthesis,was used for Cr(Ⅵ)removal from contaminate water.The removal efficiency of MoS_2 for Cr(Ⅵ)was 97% in no more than 160 min and the maximum adsorption capacity was 36.22 mg·g~(-1).The investigation on adsorption kinetics and isotherm showed that the pseudo-second-order kinetic and Langmuir isotherm models could well fit the adsorption experimental process.Adsorption thermodynamics investigation proved that the Cr(Ⅵ)adsorption on the surface of MoS_2 was a spontaneous endothermic physic-chemical process,in which the rate of adsorption was controlled by exterior surface diffusion step.It illustrated that MoS_2 nano-sheets can be used as excellent adsorbent for heavy metal ions removal from wastewater.
引文
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[2]FU F,WANG Q.Removal of heavy metal ions from wastewaters:A review[J].Journal of Environmental Management,2011,92(3):407-418.
[3]KARATEPE A,KORKMAZ E,SOYLAK M,et al.Development of a coprecipitation system for the speciation/preconcentration of chromium in tap waters[J].Journal of Hazardous Materials,2010,173(1/2/3):433.
[4]TOR A,CENGELOGLU Y,ERSOZM,et al.Transport of chromium through cation-exchange membranes by donnan dialysis in the presence of some metals of different valences[J].Desalination,2004,170(2):151.
[5]YE L J,XU H Y,ZHANG D K,et al.Synthesis of bilayer MoS2 nanosheets by a facile hydrothermal method and their methyl orange adsorption capacity[J].Materials Research Bulletin,2014,55(7):221-228.
[6]陈秀云,周欢,黄永葵,等.MoS2的制备及其吸附甲基橙性能[J].辽东学院学报(自然科学版),2015,22(4):229-233.CHEN Xiuyun,ZHOU Huan,HUANG Yongkui,et al.Preparation and adsorption properties of methyl orange on MoS2[J].Journal of Liaodong University(Natural Science Edition),2015,22(4):229-233.
[7]QIAO X,HU F,HOU D,et al.PEG assisted hydrothermal synthesis of hierarchical MoS2 microspheres with excellent adsorption behavior[J].Materials Letters,2016,169:241-245.
[8]GAO H,LYU S,DOU J,et al.The efficient adsorption removal of Cr(Ⅵ)by using Fe3O4nanoparticles hybridized with carbonaceous materials[J].RSC Advances,2015,5(74):60033-60040.
[9]ZHOU S Y,LIN C,RUI X.Fe3O4nanoparticles prepared by reverse microemulsion method[J].Journal of Fujian Medical University,2009,43(2):148-152.
[10]YU J,QI L,JARONIEC M.Hydrogen production by photocatalytic water splitting over Pt/TiO2nanosheets with exposed(001)facets[J].Journal of Physical Chemistry C,2010,114(30):13118-13125.
[11]WEBER W J,MORRIS J C.Proceeding of international conference on water pollution symposium[M].Oxford:Pergamon Press,1962:231.
[12]赵振国.Langmuir方程在稀溶液吸附中的应用[J].大学化学,1999(5):7-11.ZHAO Zhenguo.The application of Langmuir equation in dilute solution adsorption[J].University Chemistry,1999(5):7-11.
[13]KILIC M,APAYDIN-VAROL E,PTN A E.Adsorptive removal of phenol from aqueous solutions on activated carbon prepared from tobacco residues:Equilibrium,kinetics and thermodynamics[J].Journal Hazardous M,2011,189(1/2):397-403.
[14]CHEN R X,YU J G,XIAO W.Hierarchically porous MnO2microspheres with enhanced adsorption performance[J].Journal of Materials Chemistry A,2013,1:1682.
[15]唐琼瑶,何品晶,邵立明,等.双酚A和邻苯二甲酸二正丁酯在纸类上的吸附特性研究[J].环境科学,2008,29(8):2282-2286.TANG Qiongyao,HE Pinjing,SHAO Liming,et al.Isothermal studies on liquid-phase adsorption of bisphenol A and dibutyl phthalate by paper[J].Environmental Science,2008,29(8):2282-2286.
[16]倪晓宇,吴涓.铅离子的生物吸附动力学及吸附热力学研究[J].生物技术,2008,18(2):29-32.NI Xiaoyu,WU Juan.The study of biological adsorption kinetics and adsorption thermosdynamics of lead ions[J].Biotechnology,2008,18(2):29-32.
[17]LUO X M,LIU F F,LI X H,et al.WO3/TiO2nanocomposites:Salt-ultrasonic assisted hydrothermal synthesis and enhanced photocatalytic activity[J].Mater Science Semicond Process,2013,16:13.
[18]傅献彩,沈文霞,姚天扬.物理化学[M].北京:高等教育出版社,1997:379-407.FU Xiancai,SHEN Wenxia,YAO Tianyang.Physical Chemistry[M].Beijing:Higher Education Press,1997:379-407.
[19]任春艳,李雪清,师进生.巯基棉对废水中镉的吸附[J].青岛科技大学学报(自然科学版),2015,36(6):601-604.REN Chunyan,LI Xueqing,SHI Jinsheng.Cadmium adsorption of sulfhydryl cotton in wastewater[J].Journal of Qingdao University of Science and Technology(Natural Science Edition),2015,36(6):601-604.
[20]HERBES S E.Partitioning of polycyclic aromatic hydrocarbons between dissolved and particulate phases in natural waters[J].Water Research,1977,11(6):493-496.