Department of Chemical Technology, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, South Africa.
J Colloid Interface Sci. 2011 Jul 1;359(1):210-9. doi: 10.1016/j.jcis.2011.02.067. Epub 2011 Mar 8.
A polymer composite of polypropylene (PP) and clinoptilolite (CLI) for the adsorption of lead has been prepared using the melt-mixing compounding technique in a rheomixer. Characterization of the composite was performed using scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), X-ray diffraction (XRD), Brunuer-Emmett-Teller (BET), and Fourier transform infrared spectroscopy (FTIR). The influence of contact time, pH, initial metal-ion concentration, temperature, and pretreatment on the adsorption of lead (Pb) by the PP-CLI composite was investigated. Optimum pH was found to be between pH 6 and pH 8 while the maximum sorption of lead at optimal pH was 95%. No difference was observed between the adsorption behavior of composites functionalized with 20% and 30% clinoptilolite, respectively, while the pretreatment with HCl and NaCl made a slight difference to the adsorption capacity of composites. The findings from this study on the lead adsorption behavior of CLI-PP composite may have potential applications in wastewater and water purification works.
采用熔体共混技术在流变仪中制备了用于吸附铅的聚丙烯（PP）和斜发沸石（CLI）的聚合物复合材料。使用扫描电子显微镜-能量色散光谱（SEM-EDS）、X 射线衍射（XRD）、Brunuer-Emmett-Teller（BET）和傅里叶变换红外光谱（FTIR）对复合材料进行了表征。研究了接触时间、pH 值、初始金属离子浓度、温度和预处理对 PP-CLI 复合材料吸附铅（Pb）的影响。发现最佳 pH 值在 6 pH 和 8 pH 之间，而在最佳 pH 值下，铅的最大吸附率为 95%。分别用 20%和 30%斜发沸石功能化的复合材料的吸附行为没有差异，而用 HCl 和 NaCl 预处理对复合材料的吸附容量有微小影响。本研究关于 CLI-PP 复合材料的铅吸附行为的结果可能在废水和水净化工程中有潜在应用。
