Adsorption Study of Anionic Dye, Eriochrome Black T from Aqueous Medium Using Polyvinyl Alcohol/Starch/ZSM-5 Zeolite Mem
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ORIGINAL PAPER
Adsorption Study of Anionic Dye, Eriochrome Black T from Aqueous Medium Using Polyvinyl Alcohol/Starch/ZSM‑5 Zeolite Membrane Sabarish Radoor1 · Jasila Karayil2 · Jyotishkumar Parameswaranpillai1 · Suchart Siengchin1
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Here we investigated the application of a novel polyvinyl alcohol/starch/ZSM-5 zeolite membrane as an adsorbent for the removal of Eriochrome black T (EBT) from aqueous medium. Physical and chemical structure of the membranes was characterized by scanning electron microscopy, optical microscopy, Fourier-transform infrared spectroscopy, X-Ray diffraction, thermogravimetric analysis and universal testing machine. Swelling measurement shows that with increase in zeolite content the hydrophobicity of the membrane also increases. Adsorption measurements were monitored spectrophotometrically at 530 nm. Results indicate that the operational parameters (initial dye concentration, zeolite dosage, temperature, pH and contact time) has significant influence on the adsorption behavior of the membrane. The maximum adsorption capacity was estimated to be 2.17 mg/g for 5 wt% zeolite loaded membrane at an initial concentration of 10 mg/L, at room temperature and at pH 3. Adsorption kinetics analysis revealed that pseudo-second-order model describes the adsorption of EBT onto PVA/starch/ZSM-5 zeolite membrane with correlation coefficient close to one. Adsorption isotherm was analyzed using Langmuir and Freundlich isotherm models and the result shows that adsorption follow Freundlich isotherm model. Adsorption–desorption studies suggests that the membrane possess good regeneration capacity. Keywords PVA · Starch · ZSM-5 zeolite · Adsorption · Eriochrome black T
Introduction One of the main culprits for water pollution is textile and dyeing industries which dumped tons and tons of dye bearing effluents into water. Dyes are strongly colored organic molecules with extensive application in many industries such as food, textiles and printing. Majority of the dyes are toxic in nature and possess serious threat to the environment and its inhabitants [1–4]. Azo dyes are largest class of synthetic dye which contains at least one azo functional * Sabarish Radoor [email protected] * Suchart Siengchin suchart.s.pe@tggs‑bangkok.org 1
Department of Mechanical and Process Engineering, The Sirindhorn International Thai-German Graduate School of Engineering (TGGS), King Mongkut’s University of Technology North Bangkok, 1518 Wongsawang Road, Bangsue, Bangkok 10800, Thailand
Government Women’s Polytechnic College, Calicut, Kerala, India
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group, –N=N–. Removal of azo dyes from water is a tedious process as it is quite resistant towards light and chemical oxidants [5, 6]. Majority of azo dyes are mutagenic and carcinogenic in nature and thus have dire consequence on human health [7, 8]. Eriochrome black T (EBT) is an azo dye and has been used to dye fabrics such as silk, wool, etc.[9, 10]. It has been widely used as indicator
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