Studies on the Removal of Dye Using Filled Polymeric FIPN Hydrogel

International Journal of Research and Scientific Innovation (IJRSI) | Volume V, Issue XII, December 2018 | ISSN 2321–2705

Studies on the Removal of Dye Using Filled Polymeric FIPN Hydrogel

Sunanda Dey¹, N.S. Kirti², S.B. Kuila³

^1,2,3Haldia Institute of Technology, Department of Chemical Engineering, Haldia 74057, West Bengal, India

Abstract- Water-soluble Polyvinyl alcohol (PVOH) was chemically modified by in situ copolymerization of acrylic acid (AA) and acrylamide (AM) in its aqueous solution and thus producing a copolymer of polyacrylicacid-co-acrylamide designated as (PAAM) as another one soluble polymer component in PVOH solution. Finally, both the polymers PVOH and PAAM were cross-linked by glutaraldehyde (2 mass%) andN,N 0-methylenebisacrylamide (MBA) as the cross-linking agents respectively to produce a full interpenetrating network (FIPN) hydrogel. Accordingly, three different compositions of hydrogels have been synthesized varying the percentage of PAAM containing PVOH:PAAM of 1:0.25, 1:0.5 and 1:0.75 as solid polymer basis. Out of these three, hydrogel containing PVOH:PAAM of 1:0.5 designated as PAAM50 found competitive for Malachite green dye separation by adsorption compared to other two. PAAM50 was further filled with treated saw dust as low-cost filler in situ, with the mass% of 2%, 5%, 8% and 10% (of total solid polymer) thus, designated as PAAM52, PAAM55, PAAM58,and PAAM510 respectively. Unfilled PAAM50 and four filled FIPN gels along with pure saw dust were used for separation of Malachite green (Dye) from its solution of 5 ppm, 10 ppm, 25 ppm, 50 ppm, 75 ppm and 100 ppm as feed concentrations and at five different pH (4, 7, 9, 10 & 11). Percent removal of dye was calculated from the absorbance data of UV-VIS Spectrophotometer. PAAM58 gel was found most efficient compared to others with a % removal of 98.039% at the conditions of 75 ppm feed concentration and at 9 pH. Desorption study was also performed taking adsorbed PAAM58 gels at different pH.

Keywords—Hydrogel, FIPN, adsorption, dye removal, sawdust.

I. INTRODUCTION

Textile wet processing involves the use of a verity of chemicals comprising various classes of dyes and other chemicals. The wastewater stream from the textile dyeing operation, therefore, contains unutilized dyes along with a large amount of water. This also increases the risk of pollution as about 8-20% of the total pollution load is due to incomplete exhaustion of the dye [1]. It, therefore, becomes necessary to separate the dye from the effluent stream to utilize the unused dye and also reduce the risk of pollution.

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