Preparation Of Glass Hollow Fiber Membrane And Study On Dye Adsorption Performance

Membrane adsorption is a simple and efficient treatment method for organic dye wastewater pollution.Though studies on the adsorption of organic hollow fiber membrane in waste water have been reported,instability of organic materials under severe conditions(high temperature)leads to low utilization of the membrane.Inorganic hollow fiber membrane is widely used in the treatment of dye wastewater because of its excellent thermal stability,high efficiency.In this paper,glass powder was used as the main raw material The glass hollow fiber membrane was prepared through phase-inversion method.It has low price,good adsorption efficiency and high reusability,so they have a better application prospect.The main conclusions are shown as follows:Firstly,glass hollow fiber membrane with asymmetric porous structure was prepared using a mixture of phase-inversion method,sintering and acid leaching.The effects of sintering temperature and acid leaching conditions on the radial shrinkage,water contact angle,porosity and crystallization of the membranes were discussed.The results showed that the ratio of finger-like pores was decreases,and the thickness of dense layer was increases with the increase of sintering temperature.The radial shrinkage rate increases,and the permeation rate of water droplets slows down.The sodium-borate-rich phase was eluted completely,the mass loss ratio of the membrane increased,and the porosity increases first and then decreases with the increase of acid leaching concentration,temperature and time.Secondly,the results of SEM and BET showed that the glass hollow fiber membrane had an asymmetric porous structure.Zeta potential test showed that the surface of the membrane was electronegativity.The glass hollow fiber membrane was applied to the adsorption experiment of dye solution,the effects of membranes dose,pH value,temperature and initial dye concentration on the adsorption efficiency were systematically studied.The adsorption mechanisms of membrane showed that the adsorption kinetic and adsorption isotherm fitted well with the pseudo-second-order model and Freundlich model,respectively.In addition,the removal rate of membrane remained close to 85%after eight cycles of adsorption.Finally,the field had been preliminary expansion study of glass hollow fiber membrane was applied to gas separation.The glass hollow fiber membrane was used as the base membrane.Then it was immersed into silicon rubber solution with a certain concentration.The silicon rubber coated glass hollow fiber membrane was obtained.The structure and elemental changes of the composite membrane were analyzed by FT-IR and XPS.The influence of dipping concentration and dipping number on the oxygen enrichment properties of PDMS-glass hollow composite membrane were investigated.