Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Kanakapura Ramanagaram, Bangalore, 562112, India.
Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Kanakapura Ramanagaram, Bangalore, 562112, India.
J Hazard Mater. 2017 Jun 5;331:289-299. doi: 10.1016/j.jhazmat.2017.02.046. Epub 2017 Feb 27.
Herein, an attempt has been made to prepare a novel membrane with good efficiency for removal of heavy metal ions namely lead (Pb), cadmium (Cd) and chromium (Cr). 4-amino benzoic acid (ABA) was covalently grafted onto the poly vinyl chloride (PVC) backbone by CN bond to enhance the hydrophilicity. H NMR and ATR-IR spectroscopy analysis confirmed the chemical modification of PVC. Further the modified polymer was blended in different compositions with polysulfone (PSf) for optimization. Morphological changes that occurred in blend membranes, due to the incorporation of modified PVC was studied by AFM and SEM techniques. The effect on hydrophilicity and performance of blends owing to incorporation of modified PVC was evaluated by water uptake, contact angle and flux studies. The density of functional groups in blends was analyzed by its ion-exchange capacity. Batch wise filtration of metal ions was carried out and the effect of pressure, feed pH and interference of ions was thoroughly investigated. Essentially, 100% rejection was obtained for all the metal ions in acidic pH with a productivity of 2.56l/mh. The results were correlated with the results of commercially available NF 270 membrane under the same operating conditions.
本文试图制备一种新型膜，以有效去除重金属离子，即铅（Pb）、镉（Cd）和铬（Cr）。通过 CN 键将 4-氨基苯甲酸（ABA）共价接枝到聚氯乙烯（PVC）主链上，以提高亲水性。H NMR 和 ATR-IR 光谱分析证实了 PVC 的化学修饰。进一步将改性聚合物与聚砜（PSf）以不同的比例混合进行优化。通过原子力显微镜和扫描电子显微镜技术研究了由于添加改性 PVC 而在共混膜中发生的形态变化。通过水吸收、接触角和通量研究评估了由于添加改性 PVC 对共混物亲水性和性能的影响。通过离子交换容量分析了共混物中官能团的密度。进行了分批过滤金属离子实验，彻底研究了压力、进料 pH 和离子干扰的影响。在酸性 pH 下，所有金属离子的去除率均达到 100%，产率为 2.56l/mh。这些结果与相同操作条件下商业可用的 NF 270 膜的结果相关联。
