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Cadmium sorption by sodium and thiourea-modified zeolite-rich tuffs

Cadmium sorption by sodium and thiourea-modified zeolite-rich tuffs

作     者:Perfecto Barragán P M.Guadalupe Macedo M Maria T.Olguín 

作者机构:Instituto Tecnologico de TolucaLaboratorio de Investigacion en Ingenieria Ambiental.Av.Tecnologico S/NColonia Ex-Rancho La VirgenMetepecEstado de Meico CP.52140Mexico Instituto National de Investigaciones NuclearesDepartamento de QuimicaA.P.18-1027Col.EseandonDelegacion Miguel Hidalgo C.P.11801Mexico 

出 版 物:《Journal of Environmental Sciences》 (环境科学学报(英文版))

年 卷 期:2017年第29卷第2期

页      面:39-48页

核心收录:

学科分类:083002[工学-环境工程] 0830[工学-环境科学与工程(可授工学、理学、农学学位)] 08[工学] 

基  金:supported by the National Institute of Nuclear Researches(project CB-505) CONACyT(project 254665) SEP-TecNM(project 2340.09-P) 

主  题:Cadmium Zeolite-rich-tuff Sorption Kinetics Isotherms 

摘      要:In the present investigation, two zeolite-rich tuffs from Guaymas and El Cajon(State of Sonora), which were conditioned with a sodium chloride solution and subsequently modified with a thiourea solution, were chosen to evaluate the removal of Cd from aqueous systems. The zeolitic materials were characterized by scanning electron microscopy and X-ray diffraction. The surface area was also determined. The experiments were performed in a batch system, and the influences of p H, contact time between phases, and the concentration of Cd in the solution on the adsorption by sodium or thiourea-modified zeolite-rich tuff were investigated. It was found that the efficiency of Cd ion removal from aqueous solutions is influenced by the p H of the aqueous systems. The Cd adsorption kinetic data were well fitted to a pseudo-second-order model in all cases. The Langmuir and Langmuir–Freundlich isotherms adequately described the Cd sorption behavior by the zeolite from El Cajon pretreated with Na Cl and the zeolite from Guaymas modified with thiourea, respectively.

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