Sequestration of dyes from artificially prepared textile effluent using RSM-CCD optimized hybrid backbone based adsorbent-kinetic and equilibrium studies

• Published in: Journal of environmental management 2017-04, Vol.190, p.176-187
• Main Authors: Sukriti, Sharma, Jitender, Chadha, Amritpal Singh, Pruthi, Vaishali, Anand, Prerna, Bhatia, Jaspreet, Kaith, B.S.
• Format: Article
• Language: English
• Subjects: Adsorption; Adsorption isotherms; Benzophenoneidum - chemistry; Benzophenoneidum - isolation & purification; Cationic dyes; Coloring Agents - chemistry; Coloring Agents - isolation & purification; Gelatin - chemistry; Gum xanthan-Gelatin hybrid back bone; Hydrogen-Ion Concentration; Kinetics; Polymers - chemical synthesis; Polymers - chemistry; Polysaccharides, Bacterial - chemistry; Polyvinyl Alcohol - chemistry; Rhodamines - chemistry; Rhodamines - isolation & purification; RSM; Semi-IPN; Sorption kinetics; Spectroscopy, Fourier Transform Infrared; Tartrates - chemistry; Temperature; Textile Industry; Waste Disposal, Fluid - methods; Water Pollutants, Chemical - chemistry; Water Pollutants, Chemical - isolation & purification; X-Ray Diffraction
• ISSN: 0301-4797; 1095-8630
• DOI: 10.1016/j.jenvman.2016.12.065

Present work reports the synthesis of semi-Interpenetrating Network Polymer (semi-IPN) using Gelatin-Gum xanthan hybrid backbone and polyvinyl alcohol in presence of l-tartaric acid and ammonium persulphate as the crosslinker-initiator system. Reaction parameters were optimized with Response Surface Methodology (RSM) in order to maximize the percent gel fraction of the synthesized sample. Polyvinyl alcohol, l-Tartaric acid, ammonium persulphate, reaction temperature, time and pH of the reaction medium were found to make an impact on the percentage gel fraction obtained. Incorporation of polyvinyl alcohol chains onto hybrid backbone and crosslinking between the different polymer chains were confirmed through techniques like FTIR, SEM-EDX and XRD. Semi-IPN was found to be very efficient in the removal of cationic dyes rhodamine-B (70%) and auramine-O (63%) from a mixture with an adsorbent dose of 700 mg, initial concentration of rhodamine-B 6 mgL−1 and auramine-O 26 mgL−1, at an time interval of 22–25 h and 30 °C temp. Further to determine the nature of adsorption Langmuir and Freundlich adsorption isotherm models were studied and it was found that Langmuir adsorption isotherm was the best fit model for the removal of mixture of dyes. Kinetic studies for the sorption of dyes favored the reaction mechanism to occur via a pseudo second order pathway with R2 value about 0.99. [Display omitted] •Ecofriendly semi-IPN device was synthesized under in air condition.•RSM-CCD techniques were used to enhance the gel fraction of the semi-IPN.•High adsorption capacity of semi-IPN treated effectively dye contaminated water.•Adsorption isotherm indicated the applicability of Langmuir isotherm.•Kinetic studies followed pseudo second order pathway for dyes adsorption.