Ion Permeation Study on Cellulose Acetate/ Chitosan Membrane With Multivalent Aqueous Electrolyte Solution

Abstract

The present study CA/chitosan blend membrane was prepared by solvent vaporization method. The morphology of membrane was studied using Scanning Electron Microscopy (SEM) and the thermal stability using Thermo Gravimetric Analysis (TGA); and the physicochemical properties such as water content, kinetic of membrane flux, permeability and flow were investigated. Parameters on which membrane selectivity depends, are also discussed. It has also been explored the effect of electrolyte solution on ion transport properties of cellulose acetate /chitosan membrane under a concentration gradient. Water uptake in the absence and presence of electrolyte were carried out. The thermal stability of Cellulose acetate /Chitosan blends membrane to provide information regarding weight loss of the prepared membrane represent some significant steps i.e. water loss from membrane phase, followed by degradation process. First weight loss occurred at 80 to 130 0 C which conform evaporation of residual water from the membrane. The second degradation stage was noticed around 360.36 0 C, which are due to amino and hydroxyl groups. The work has been done with the object to investigate the transport properties of cellulose acetate /chitosan synthetic membrane, conducted under a concentration gradient .More ever, the water uptake and conductance experiment were carried out to investigate the effect of those electrolyte solutions. As time increases, the density of membrane functional groups increases and approaches to narrow proximity to each other. Membrane water retention capacity varies electrolyte to electrolyte. In present case it is 83.6 % for 0.01 M, NaCl; 50.9 % for 0.01M, MgCl2 and 44.0 % for 0.01M BaCl2.

Preparation of Hydrophilic Bentonite Grafted Mixed Matrix Polyvinylchloride Membrane With Superior Hydrophilicity

“…The prepared membranes had an average pore size range below 1 µm which was quite suitable for many industrial and municipal separation applications. Various researchers have also used membranes with such pore size range for the separation of salts, humic acid, BSA, and oil from aqueous solutions by using a membrane with this pore size range [37][38][39][40][41] .…”

“…Non-solvent induced phase separation (NIPS) process was adopted for preparing Hydrophilic Bentonite (HB) grafted mixed matrix polyvinylchloride (PVC) membranes in lab [35][36][37] . A first known amount of HB was dispersed in DMAc and sonicated for 2 hours to have a homogenous suspension for a polymeric solution.…”

“…Where Ww and WD were the weight of the sample in the wet and dry state. V was the volume of membrane and ρw was the density of water 36 .…”

“…To decrease the compaction effect and then the pressure was reduced to 1.5bar. At steady state, water flux was calculated using the following equation 36 :…”

ADSORPTION OF M(II) (M = Mn, Cu, Zn) IN VARIOUS pH AND CONTACT TIME USING CHITOSAN-SILICA PREPARED BY SOL-GEL METHOD

“…Kyzas and Bikiaris summarised published studies (during 2012-2014) of modified chitosan for adsorption of dyes and metal ions including their adsorption capacity. 5 There are two main modifications of chitosan, namely by grafting (functional group insertion) or by cross-linking reaction (combining with the macromolecular unit), such as zeolite, [6][7] polyvinyl alcohol, 8 graphite oxide, 9 alumina, 10 3,4,5-trihydroxy benzoic acid, 11 trimethylamine sulphur trioxide, 12 silica, [13][14][15] cellulose acetate 16 etc. Many of these modifications resulting in adsorbent with better adsorption capacity and durability in extreme conditions.…”