多孔蒙脱土的制备及对Pb(Ⅱ)吸附特性研究
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摘要
为改善蒙脱土对Pb(Ⅱ)的吸附性能,以碳酸钙作为致孔剂,以钠基蒙脱土(MMT,montmorillonite)作为实验原料,制备多孔蒙脱土材料(PM,porous montmorillonite)。通过(SEM,scanning electronmicroscopy),(FTIR,fourier transform infrared spectrum),(XRD,X-ray diffraction)进行表征分析,研究了PM对Pb(Ⅱ)的吸附性能。实验结果表明:PM具有发达的孔状结构;在25℃时,PM对Pb(Ⅱ)的吸附量,随pH值的增加先增加后减小,在pH为5.5时达到最大;PM对Pb(Ⅱ)的吸附动力学过程符合准二级动力学模型;吸附等温线符合Langmuir模型,在25℃,pH为5.5时,饱和吸附量达到143.5mg·g。
To improve adsorption propertiesof Pb(Ⅱ)onmontmorillonite,porous montmorillonite(PM)is prepared using CaCO_3 porogen and Na-montmorillonite material.The properties of PM are characterized by scanning electron microscopy(SEM),Fourier transform infrared spectrum(FTIR)and X-ray diffraction(XRD),and the adsorption properties of Pb(Ⅱ)on PM are discussed.The experimental results show that PM has abundant pores.With the increase of PH value,adsorption capacity by PM of Pb(Ⅱ)increases first and then decreases at 25℃,and the adsorption capacity is the highest when initial pH is 5.5.The adsorption process accords with the pseudo-second order kinetics model and the adsorption isotherm accords with Langmuir equation.The saturated adsorption capacity is 143.5 mg/g at 25℃,when pH is 5.5.
To improve adsorption propertiesof Pb(Ⅱ)onmontmorillonite,porous montmorillonite(PM)is prepared using CaCO_3 porogen and Na-montmorillonite material.The properties of PM are characterized by scanning electron microscopy(SEM),Fourier transform infrared spectrum(FTIR)and X-ray diffraction(XRD),and the adsorption properties of Pb(Ⅱ)on PM are discussed.The experimental results show that PM has abundant pores.With the increase of PH value,adsorption capacity by PM of Pb(Ⅱ)increases first and then decreases at 25℃,and the adsorption capacity is the highest when initial pH is 5.5.The adsorption process accords with the pseudo-second order kinetics model and the adsorption isotherm accords with Langmuir equation.The saturated adsorption capacity is 143.5 mg/g at 25℃,when pH is 5.5.
引文
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[23]Hannatu A S,Mansor B A,Mohd Z H,et al.Nanocomposite of ZnO with montmorillonite for removal of lead and copper ions from aqueous solutions[J].Process Safety and Environmental Protection,2017,109:97-105.
[2]Liu W,Zhao C,Wang S,et al.Adsorption of cadmium ions from aqueous solutions using nano-montmorillonite:kinetics,isotherm and mechanism evaluations[J].Research on Chemical Intermediates,2018,44:1441-1458.
[3]Park C W,Kim B H,Yang H M,et al.Enhanced desorption of Cs from clays by apolymeric cation-exchange agent[J].Journal of Hazardous Materials,2017,327:127-134.
[4]边凌涛,张连科,李海鹏,等.壳聚糖/羟基镧复合改性膨润土对Pb(Ⅱ)的吸附特性[J].重庆大学学报,2018,41(5):76-84.BIAN Lingtao,ZHANG Lianke,LI Haipeng,et al.Adsorption property on Pb(Ⅱ)of bentonite modified by chitosan/hydroxy-lanthanum[J].Journal of Chongqing University,2018,41(5):76-84.(in Chinese)
[5]Marques M,Fernandes B.Cation exchange and surface complexation of lead on montmorillonite and illite including competitive adsorption effects[J].Applied Geochemistry,2019,100:190-202.
[6]Ma Y L,LV L,Guo Y R,et al.Porous lignin based poly(acrylic acid)-organo-montmorillonitenanocomposites-swelling behaviors and rapid removal of Pb(Ⅱ)ions[J].Polymer,2017,128:12-23.
[7]Tsai W C,Luna M D G D,Bermillo-Arriesgado H L P,et al.Competitive fixed-bed adsorption of Pb(Ⅱ),Cu(Ⅱ),and Ni(Ⅱ)from aqueous solution using chitosan-coated bentonite[J].International Journal of Polymer Science,2016,6:1-11.
[8]Hua C,Zhu P F,Cai M,et al.Comparative adsorption of Pb(Ⅱ),Cu(Ⅱ)and Cd(Ⅱ)on chitosan saturated montmorillonite-Kinetic,thermodynamic and equilibrium studies[J].Applied Clay Science,2017,143:320-326.
[9]张帆,李菁,谭建华,等.吸附法处理重金属废水的研究进展[J].化工进展,2013,32:2749-2756.ZHANG Fan,LI Jing,TAN Jianhua,et al.Advance of the treatment of heavy metal wastewater by adsorption[J].Chemical Industry and Engineering Progress,2013,32:2749-2756.(in Chinese)
[10]王秀莉,尚玉俊,宋丹丹.新型吸附剂处理重金属废水的研究进展[J].工业水处理,2014,7:5-12.WANG Xiuli,SHANG Yujun,SONG Dandan.Research progress in a new type of adsorbents for removing heavy metals from wastewater[J].Industrial Water Treatment,2014,7:5-12.(in Chinese)
[11]Vijay B Y,Ranu G,Sippy K.Clay based nanocomposites for removal of heavy metals from water-A review[J].Journal of Environmental Management,2019,232:803-817.
[12]Ma L,Chen Q,Zhu J,et al.Adsorption ofphenol and Cu(Ⅱ)onto cationic and zwitterionic surfactant modified montmorillonite in single and binary systems[J].Chemical Engineering Journal,2016,283:880-888.
[13]Taha A,Shreadah M A,Ahmed A,et al.Cd(Ⅱ),and Ni(Ⅱ)onto Egyptian Na-activated bentonite;equilibrium,kinetics,thermodynamics,and application for seawater desalination[J].Journal of Environmental Chemical Engineering,2016,4:1166-1180.
[14]Ninago M D,López O V,Passaretti M G.Mild microwave-assisted synthesis of aluminum-pillared bentonites[J].Journal of Thermal Analysis&Calorimetry,2017,129(3):1517-1531.
[15]梁亚琴,张淑萍,李慧,等.改性蒙脱土去除水中重金属离子研究新进展[J].化工进展,2018,37(8):3179-3187.LIANG Yaqin,ZHANG Shuping,LI Hui,et al.Progress in development of modified montmorillonite for adsorption of heavy metal ions[J].Chemical Industry and Engineering Progress,2018,37(8):3179-3187.(in Chinese)
[16]Yang J,Yu K,Liu C.Chromium immobilization in soil using quaternary ammonium cations modified montmorillonite-Characterization and mechanism[J].Journal of Hazardous Materials,2017,321:73-80.
[17]Wang S,Dong Y,He M,et al.Characterization of GMZ bentonite andits application in the adsorption of Pb(Ⅱ)from aqueous solutions[J].Applied Clay Science,2009,43:164-171.
[18]郭堃梅,马毅杰,韩和平,膨润土对Pb2+的吸附性能及影响吸附的主要因素[J].环境科学学报,2000,20(5):654-656.GUO Kunmei,MA Yijie,HAN Heping.Adsorption of Pb2+on Bentonite and major effecting factors[J].Acta Scientiae Circumstantiae,2000,20(5):654-656.(in Chinese)
[19]Zhu S D,Xia M Z,Chu Y T,et al.Adsorption and desorption of Pb(Ⅱ)on l-Lysine modified montmorillonite and the simulation of interlayer structure[J].Applied Clay Science,2019,169:40-47.
[20]Katayoon K,Mansor B A,Hamid R F M,et al.Rapid and high capacity adsorption of heavy metals by Fe3O4/montmorillonitenanocomposite using response surface methodology:preparation,characterization,optimization,equilibrium isotherms,and adsorption kinetics study[J].Journal of the Taiwan Institute of Chemical Engineers,2015,49:192-198.
[21]Ana-Maria G,Fran9oise N,ValentinZ,et al.Adsorption of lead(Ⅱ)ions from aqueous solutions onto Cr-pillared clays[J].Applied Clay Science,2018,152:44-50.
[22]Liang W D,Liu Y,Sun H X,et al.Robust and all-inorganic absorbent based on natural clay nanocrystals with tunable surface wettability for separation and selective absorption[J].The Royal Society of Chemistry,2014,4:12590-12595.
[23]Hannatu A S,Mansor B A,Mohd Z H,et al.Nanocomposite of ZnO with montmorillonite for removal of lead and copper ions from aqueous solutions[J].Process Safety and Environmental Protection,2017,109:97-105.