Synthesis and characterization of biopolymeric blend membranes based on sodium alginate for the pervaporation dehydration of isopropanol/water mixtures

Synthesized graft copolymers of hydroxyethylcellulose and acrylamide (HEC-g-AAm) were prepared by solution polymerization method. The grafting reaction was confirmed by Fourier transform infrared spectroscopy and differential scanning calorimetry. The graft copolymers were blended in different ratios with sodium alginate (NaAlg), and the membranes were prepared by the solution casting method. The resulted membranes were then crosslinked with glutaraldehyde (GA) in acetone-water medium. Swelling experiments were performed on the blend membranes in water-isopropanol mixtures at 30 degrees C. Pervaporation experiments were performed at 30 degrees C for the feed mixtures ranging from 10-50wt.% of water in water-isopropanol mixtures. Flux and selectivity of the membranes increased with an increasing amount of HEC-g-AAm copolymers in the blend membrane. The membrane NaAlg/HEC-g-AAm-30 appears to have a good potential for dehydrating 10wt.% water with a high selectivity of 2036 and a substantial water flux of 1.036kg/m(2) center dot h. Flux increased with increasing amount of water in the feed, but selectivity decreased considerably

Novel nanocomposite membranes of sodium alginate filled with polyaniline-coated titanium dioxide for dehydration of 1,4-dioxane/water mixtures

Novel sodium alginate filled with polyaniline coated titanium dioxide [NaAlg-PANI (TiO(2))] nanocomposite membranes were prepared by incorporating nanosized titanium dioxide modified with polyaniline into NaAlg matrix and crosslinked with glutaraldehyde. The developed membranes were assessed for intermolecular interactions using Fourier transform infrared (FTIR) to understand their interaction properties. Further, X-ray diffraction (XRD) studies were also performed to evaluate the morphology of the NaAlg mixed matrix membrane. The % degree swelling (DS) was calculated for all membranes in 1,4-dioxane/water mixtures at 30 degrees C to know the correlation between pervaporation (PV) results and DS. The membranes were tested for suitability to dehydrate 1,4-dioxane by PV has been demonstrated. The effect of feed composition as well as amount of filler loading on PV separation performance of these membranes were evaluated in terms of flux and selectivity

ROS-generating, ph-responsive and highly tunable reduced graphene oxide-embedded microbeads showing intrinsic anticancer properties and multi-drug co-delivery capacity for combination cancer therapy

202309 bcvcVersion of RecordOthersDepartment of Science and Technology, Ministry of Science and Technology, IndiaPublishe