含有机模板剂的ZSM-5对水中铜离子的吸附
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摘要
以1,6-己二胺(HMD)为模板剂,由麦羟硅钠石转晶制备的ZSM-5沸石分子筛在模板剂未被烧除的情况下对水中铜离子(Cu~(2+))有良好的吸附作用,并从溶液化学角度如:吸附时间、pH值、温度等方面,考察了含有HMD的ZSM-5沸石分子筛对水溶液中Cu~(2+)的吸附行为。结果表明,以HMD为模板剂的ZSM-5分子筛对水中Cu~(2+)的吸附在pH=6的条件下吸附容量最大;由Langmuir模型计算出当Cu~(2+)水溶液pH=6、温度为318K时,HMD为模板剂的ZSM-5沸石分子筛对Cu~(2+)的最大吸附量为86.96mg/g;热力学数据表明,HMD为模板剂的ZSM-5沸石分子筛对Cu~(2+)的吸附行为是吸热、自发的过程;动力学数据表明,该过程符合准二级动力学方程,属于物理吸附过程。HMD为模板剂的ZSM-5沸石分子筛可以作为一种新型吸附剂。
ZSM-5 zeolite synthesized from magadiite using 1,6-hexamethylenediamine(HMD)as template shows good ability in adsorption of Cu~(2+)from aqueous solution.Effects of parameters(contact time,pH value,temperature,etc)on the adsorption of Cu~(2+)onto ZSM-5 were investigated by batch techniques.The adsorption of Cu~(2+)on ZSM-5 is significantly influenced by pH value,and the highest adsorption is obtained at pH=6.The maximum adsorption capacity of Cu~(2+)on ZSM-5 calculated by Langmuir model at pH =6 and 318 K is 86.96 mg/g.The thermodynamic parameters calculated by temperature-dependent isotherms indicate that the adsorption of Cu~(2+)on ZSM-5 is an endothermal and spontaneous process.The data of adsorption kinetics is well fitted with pseudo-second-order kinetic model,and this process can be attributed to the physical absorption.Results indicate that ZSM-5 zeolite containing with HMD potentially serves as a promising adsorbent.
ZSM-5 zeolite synthesized from magadiite using 1,6-hexamethylenediamine(HMD)as template shows good ability in adsorption of Cu~(2+)from aqueous solution.Effects of parameters(contact time,pH value,temperature,etc)on the adsorption of Cu~(2+)onto ZSM-5 were investigated by batch techniques.The adsorption of Cu~(2+)on ZSM-5 is significantly influenced by pH value,and the highest adsorption is obtained at pH=6.The maximum adsorption capacity of Cu~(2+)on ZSM-5 calculated by Langmuir model at pH =6 and 318 K is 86.96 mg/g.The thermodynamic parameters calculated by temperature-dependent isotherms indicate that the adsorption of Cu~(2+)on ZSM-5 is an endothermal and spontaneous process.The data of adsorption kinetics is well fitted with pseudo-second-order kinetic model,and this process can be attributed to the physical absorption.Results indicate that ZSM-5 zeolite containing with HMD potentially serves as a promising adsorbent.
引文
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[3]LIU Dagang,LI Zehui,ZHU Yi,et al.Recycled chitosan nanofibril as an effective Cu(II),Pb(II)and Cd(II)ionic chelating agent:Adsorption and desorption performance[J].Carbohydr Polym,2014,111:469-476.
[4]ZENG Lixuan,CHEN Yufei,ZHANG Qiuyun,et al.Adsorption of Cd(II),Cu(II)and Ni(II)ions by crosslinking chitosan/rectorite nano-hybrid composite microspheres[J].Carbohydr Polym,2015,130:333-343.
[5]张琼,程文娜,武雅,等.重金属工业废水处理技术研究[J].广东化工,2014,41(2):91-92.(ZHANGQiong,CHENG Wenna,WU Ya,et al.Study on heavy metal industrial wastewater treatment technology[J].Guangdong Chemical Industry,2014,41(2):91-92.
[6]COMRMA A.Inorganic solid acids and their use in acidcatalyzed hydrocarbon reactions[J].Chem Rev,1995,95(3):599-614.
[7]DAVIS M E.Ordered porous materials for emerging applications[J].Nature,2002,417(6891):813-821.
[8]IVANOVA I,KOLYAGIN Y.Impact of in situ MASNMR techniques to the understanding of the mechanisms of zeolite catalyzed reactions[J].Chem Soc Rev,2010,39(12):5018-5050.
[9]徐如人,庞文琴,屠昆岗,等.分子筛与多孔材料化学[M].北京:科学出版社,2004.
[10]WANG Yu,LTianming,WANG Huilong,et al.ZSM-5 and ferrierite synthesized by magadiite conversion method in 1,6-hexamethylenediamine system[J].Microporous Mesoporous Mater,2015,208:66-71.
[11]NAMASIVAYAM C,KAVITHA D.Removal of Congo Red from water by adsorption onto activated carbon prepared from coir pith,an agricultural solid waste[J].Dyes Pigments,2002,54:47-58.
[12]RAO M M,RAMESH A,RAO G P C,et al.Removal of copper and cadmium from the aqueous solutions by activated carbon derived from Ceiba pentandra hulls[J].J Hazard Mater,2006,129:123-129.
[13]王春燕.以铝矾土为原料沸石分子筛的合成及其吸附去除水溶液中镉离子的基础研究[D].大连:大连理工大学,2012.
[14]ZHANG Hui,YU Xianjin,CHEN Lei,et al.Investigation of radionuclide Ni-63(II)sorption on ZSM-5zeolite[J].J Radioanal Nucl Chem,2010,286(1):249-258.
[15]ZHANG Hui,YU Xianjin,CHEN Lei,et al.Study of Ni-63 adsorption on NKF-6 zeolite[J].J Environ Radioact,2010,101(12):1061-1069.
[16]SHAWABKEH R,AL-HARAHSHEH A,HAMI M,et al.Conversion of oil shale ash into zeolite for cadmium and lead removal from wastewater[J].Fuel,2004,83(7-8):981-985.
[17]ZHANG Hongxing,HUANG Hongliang,LI Chunxi,et al.Adsorption behavior of metal-organic frameworks for thiophenic sulfur from diesel oil[J].Ind Eng Chem Res,2012,51(38):12449-12455.
[18]YU Fei,WANG Yanqing,LI Xiaoman,et al.Kinetic and thermodynamic studies of toluene,ethylbenzene,and m-xylene adsorption from aqueous solutions onto KOH-activated multiwalled carbon nanotubes[J].JAgric Food Chems,2012(60):12245-12253.
[19]SANDRA L B,MARK E D.Mechanism of structure direction in the synthesis of pure-silica zeolites.2.Hydrophobic hydration and structural specificity[J].Chem Mater,1995,7(8):1453-1463.