Department of Chemical Engineering, College of Engineering and Technology, Adigrat University, Tigray, Ethiopia.
Department of Chemical Engineering, Indian Institute of Technology Guwahati, 781039, Assam, India.
J Environ Manage. 2018 Jul 1;217:600-610. doi: 10.1016/j.jenvman.2018.03.131. Epub 2018 Apr 9.
Graft copolymerization of cellulose acetate (CA) and poly (methyl methacrylate) (PMMA) was synthesized through free radical polymerization in the presence of cerium sulfate (CS) as initiator under nitrogen atmosphere in an aqueous solution. During the grafting reactions, the effects of polymerization time and temperature on the grafting were investigated. Furthermore, functionalization of the synthesized product was done using amine group (tetraethylenepentamine, TEPA). The results from Nuclear Magnetic Resonance (H NMR) spectra confirmed a successful grafting of PMMA on the CA membrane surfaces. Zeta potential (ζ), field emission scanning electron microscopy (FESEM), and atomic absorption spectrophotometer (AAS) characterization studies were done. The maximum removal efficiencies for un-grafted CA (un-g-CA), CA-g-PMMA, and CA-g-PMMA-TEPA membranes at pH of 7.0 were 34.5%, 83.3%, and 99.1%, respectively. The removal percentage results were detected to increase with increasing in the regeneration cycles. At the end of the fourth cycle, the HA removal percentages were 41.6%, 87.4%, and 99.9% for un-g-CA, CA-g-PMMA and CA-g-PMMA-TEPA membranes, respectively.
在氮气气氛下，以硫酸铈（CS）为引发剂，在水溶液中通过自由基聚合，将纤维素醋酸酯（CA）和聚甲基丙烯酸甲酯（PMMA）进行接枝共聚。在接枝反应过程中，研究了聚合时间和温度对接枝的影响。此外，还使用胺基（四乙烯五胺，TEPA）对合成产物进行功能化。核磁共振（H NMR）谱的结果证实了 PMMA 在 CA 膜表面上的成功接枝。进行了zeta 电位（ζ）、场发射扫描电子显微镜（FESEM）和原子吸收分光光度计（AAS）的表征研究。在 pH 值为 7.0 时，未接枝 CA（un-g-CA）、CA-g-PMMA 和 CA-g-PMMA-TEPA 膜的最大去除效率分别为 34.5%、83.3%和 99.1%。去除百分比的结果表明，随着再生循环次数的增加而增加。在第四轮结束时，un-g-CA、CA-g-PMMA 和 CA-g-PMMA-TEPA 膜对 HA 的去除率分别为 41.6%、87.4%和 99.9%。
