Barrera-Díaz C, Almaraz-Calderón C, Olguín-Gutiérrez Ma T, Romero-Romo M, Palomar-Pardavé M
Universidad Autónoma del Estado de México, Facultad de Química, Paseo Colón intersección Paseo Tollocan S/N. C.P. 50120, Toluca, Estado de México, México.
Environ Technol. 2005 Jul;26(7):821-9. doi: 10.1080/09593332608618519.
This work presents the conditions for Pb(II) and Cd(II) removal from aqueous solution using two different sorbent materials, namely, clinoptilolite and Opuntia ectodermis, which were characterized before and after entering into contact with the metal-containing aqueous media, using scanning electron microscopy (SEM), thermal analysis (TGA) and surface area (BET). Metal removal was found to depend on the initial metal concentration in aqueous solution, pH and the mass/volume ratio. The Pb(II) and Cd(II) uptake process was maximum at pH 4 for both sorbents, which showed an adsorption capacity that was adequately described by the Freundlich adsorption isotherm. The Thomas model was used to describe the adsorption data from column studies, the sorption capacity was 12.21 Pb(II) mg per gram of Opuntia ectodermis, while 7.71 Pb(II) mg per gram of clinoptilolite were adsorbed; lower values were obtained for Cd(II) removal. It was demonstrated that the use of low cost materials for the treatment of Pb(II), and Cd(II), containing wastewater is an effective and economical alternative method.
这项工作展示了使用两种不同吸附剂材料（即斜发沸石和仙人掌外皮）从水溶液中去除Pb(II)和Cd(II)的条件，在与含金属的水介质接触之前和之后，使用扫描电子显微镜（SEM）、热分析（TGA）和表面积（BET）对其进行了表征。发现金属去除取决于水溶液中的初始金属浓度、pH值和质量/体积比。两种吸附剂对Pb(II)和Cd(II)的吸附过程在pH 4时达到最大值，其吸附容量可用Freundlich吸附等温线充分描述。采用Thomas模型描述柱实验的吸附数据，仙人掌外皮每克对Pb(II)的吸附容量为12.21 mg，斜发沸石每克吸附7.71 mg Pb(II)；Cd(II)去除量较低。结果表明，使用低成本材料处理含Pb(II)和Cd(II)的废水是一种有效且经济的替代方法。
