Study on thermo-kinetic modeling of green route synthesized inorganic loading on PVDF membrane for Cr(VI) removal and it
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ORIGINAL PAPER
Study on thermo-kinetic modeling of green route synthesized inorganic loading on PVDF membrane for Cr(VI) removal and its optimization Zeenat Arif 1
&
Naresh Kumar Sethy 1 & Pradeep Kumar Mishra 1 & Bhawna Verma 1
Received: 18 December 2019 / Accepted: 29 May 2020 # The Polymer Society, Taipei 2020
Abstract Mathematical modeling of a phase inversion membrane was studied to predict the morphology. The effect of different concentrations of TiO2 nanoparticles on the thermodynamic and kinetic properties of polyvinylidene fluoride (PVDF) membrane casting solutions was investigated. The addition of green synthesized TiO2 increases the viscosity, and a sufficient amount results in the formation of two phases. Thermodynamics enhances the demixing rate, whereas kinetics delays the demixing rate; this trade-off between thermodynamic and kinetic parameter will affect the membrane morphology. A quadratic phase diagram for PVDF/ TiO2/solvent/Water system was drawn experimentally at different concentrations of TiO2 using a new method. Synthesized membranes were characterized by the contact angle, porosity, and permeability. Surface morphologies at different compositions were also examined using High Resolution scanning electron microscope (HRSEM). At TiO2 concentration of 2 wt% in the polymer casting solution, thermodynamics parameter dominates kinetics parameter; thus, maximum porosity with enhanced permeability was achieved experimentally. The importance of thermo-kinetic parameters was further assessed using response surface optimization. The study suggested an optimum value of 2.165% of weight% TiO2 at 5.125 pH giving excellent agreement to the experimental data. Keywords Nanoparticle . Thermodynamic . Separation technique . Phase diagram
Introduction Applications of membranes for the treatment of water and wastewater in food and dairy industries are increasing rapidly [1]. Efficacy of the membrane depends on its porosity, morphology, hydrophilicity, and surface roughness [2]. Incorporating additives into the membrane casting solution is an efficient method to enhance the performance of the * Zeenat Arif [email protected] Naresh Kumar Sethy [email protected] Pradeep Kumar Mishra [email protected] Bhawna Verma [email protected] 1
Department of Chemical Engineering and Technology, Indian Institute of Technology (BHU), Varanasi, India
resultant membrane through the alteration in its permeation property and efficiency [3]. The membrane morphology strongly affects these two parameters. The thermodynamic and kinetics interactions determine the morphology of the membrane during membrane fabrication. Thus it becomes essential to understand the importance of thermodynamic and kinetic parameters. The thermodynamic parameter defines the porosity and morphology, and the kinetic parameter controls the surface hydrophilicity and roughness and, thus, the antifouling property of the membrane [2]. Thermodynamic and kinetic properties of the polymeric casting solution also affect the d
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