Novel modified poly vinyl chloride blend membranes for removal of heavy metals from mixed ion feed sample

Vignesh Nayak; M S Jyothi; R Geetha Balakrishna; Mahesh Padaki; Sebastien Deon

doi:10.1016/j.jhazmat.2017.02.046

Novel modified poly vinyl chloride blend membranes for removal of heavy metals from mixed ion feed sample

J Hazard Mater. 2017 Jun 5:331:289-299. doi: 10.1016/j.jhazmat.2017.02.046. Epub 2017 Feb 27.

Authors

Vignesh Nayak¹, M S Jyothi¹, R Geetha Balakrishna², Mahesh Padaki³, Sebastien Deon⁴

Affiliations

¹ Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Kanakapura Ramanagaram, Bangalore, 562112, India.
² Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Kanakapura Ramanagaram, Bangalore, 562112, India. Electronic address: br.geetha@jainuniversity.ac.in.
³ Centre for Nano and Material Sciences, Jain University, Jain Global Campus, Kanakapura Ramanagaram, Bangalore, 562112, India; National University of Science and Technology "MISIS", Moscow, 119049, Russia. Electronic address: sp.mahesh@jainuniversity.ac.in.
⁴ Institut UTINAM, UMR CNRS 6213, Université de Bourgogne-Franche-Comté,16 route de Gray, Besançon Cedex 25030, France.

PMID: 28273579
DOI: 10.1016/j.jhazmat.2017.02.046

Abstract

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. ¹H 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/m²h. The results were correlated with the results of commercially available NF 270 membrane under the same operating conditions.

Keywords: 4-Amino benzoic acid; Blend membranes; NF 270; Optimum and heavy metal rejection.