A biomimetic approach to enhance selectivity of direct dyes using VGCNF in polysulphone based nanofiltration membranes |
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| Institution: | 1. Department of Chemistry, Raghu Engineering College, Visakhapatnam, 531162, Andhra Pradesh, India;2. Department of Chemistry, Krishna University, Andhra Pradesh, 521004, India;1. Inorganic Materials Research Laboratory, Department of Pure and Applied Chemistry, Faculty of Physical Sciences, University of Calabar, Calabar, Nigeria;2. Computational and Bio-Simulation Research Group, University of Calabar, Calabar, P.M.B 1115, Nigeria;1. Alpine Institute of Management and Technology, Dehradun, Uttarakhand, 248007, India;2. Department of Chemistry, H.N.B. Garhwal University, Srinagar, Garhwal, Uttarakhand, 246174, India;3. School of Applied and Life Sciences, Uttaranchal University, Dehradun, Uttarakhand, 248007, India;4. Department of Microbiology, All India Institute of Medical Sciences, Rishikesh, Uttarakhand, India;1. Department of Physics, Sri Paramakalyani College, Alwarkurichi, Affiliated to Manomaniam Sundaranar University, Tamil Nadu, India;2. Sri Paramakalyani College, Alwarkurichi, Affiliated to Manomaniam Sundaranar University, Tamil Nadu, India |
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| Abstract: | Mussel inspired chemistry has gain tremendous interest in the field of membrane science and technology. Inspired by the adhesive proteins present in mussels, approaches involving the dopamine to modify the surfaces have become the predominantly striking strategy. In this work, an effective strategy is proposed to improve the selectivity of vapour grown carbon nanofibers (VGCNF) via the bio inspired polydopamine (PDA) functionalization approach. The varying concentration of modified VGCNF (D-A-VGCNFs) were employed in polysulphone (PS) membrane. The morphological characteristics of membranes were evaluated by SEM and AFM. Data depicted the uniform distribution of nanofibers (NFs) in the media and amended microstructure of the membranes. Modified membrane having the maximum amount of D-A-VGCNFs (DM5) proved to be more hydrophilic in nature with contact angle value of 57° whereas the CA value of pure PS membrane (DM0) was 76°. The performance test confirmed that the DM5 has enhanced dye rejection ratios which are 95%, 97% and 96% with improved permeate fluxes (like 56 L/m2.h, 40 L/m2.h and 53 L/m2.h for Direct Red 31, Direct Blue 86 and Direct Yellow 4 dyes respectively. Furthermore, DM5 showed much better anti-fouling properties after several cycles as compared to DM0. So, this work proved to be a milestone in the applications of nanofiltration (NF) membranes to remove the dyes from the textile wastewater. |
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| Keywords: | Vapour grown carbon nanofibers (VGCNF) Polysulphone Dopamine Direct dyes |
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