Preparation Of TiO₂/Hydrogel Complex And Photocatalytic Degradation Of Methyl Orange

In recent years,with the rapid development of China’s industrial technology,environmental pollution has become increasingly serious.How to deal with water pollution has also become a crucial issue.Photocatalytic technology,as a new technology for wastewater treatment in recent years,plays an important role in solving pollution problems.Titanium dioxide（TiO₂）,as a highly efficient,stable and environmentally friendly photocatalytic material,has inestimable application potential in photocatalysis.However,a T present,TiO₂ mostly exists in the nature in the form of powder,which is difficult to separate from water after catalytic degradation of pollutants,which is not conducive to recycling.Therefore,researchers began to look for suitable carriers for TiO₂.In recent years,due to the characteristics of polymer hydrogels swelling in water but not dissolving,we began to study the introduction of TiO₂ particles into polymer hydrogels,which can not only effectively separate TiO₂ from water,but also enhance the matrix strength of hydrogels.In this paper,acrylamide（AAm）was selected as hydrogel monomer material,and TiO₂ particles were introduced into the system to prepare hydrogel complex.The specific work is divided into the following two parts.In the first part,TiO₂（P25）particles were introduced into the polyacrylamide hydrogel system for composite,and a series of TiO₂/hydrogel composites were prepared.XRD,SEM,tensile compression and photocatalytic tests were carried out on the prepared composite hydrogel,which proved that the addition of TiO₂ particles improved the mechanical properties of pure polyacrylamide hydrogel.Meanwhile,the degradation rate of methyl orange showed that the composite hydrogel had good photocatalytic degradation performance.In addition,the amount of TiO₂ particles,the amount of pore-forming agent ammonium bicarbonate,light time,the amount of TiO₂/hydrogel complex,the p H value of methyl orange solution and different initial concentration can all affect the photocatalytic degradation effect.The degradation rate of methyl orange solution can reach 93.3%,and the composite hydrogel has good stability as a photocatalyst.This part of work provides a new idea for the improvement of hydrogel matrix strength and the wide application of TiO₂photocatalytic materials.In the second part,TiO₂ particles doped with Sn element were prepared by precipitation method with titanium sulfate as titanium source,urea as precipitant and stannic chloride pentahydrate as tin source.The prepared TiO₂-Sn O₂ particles were characterized by XRD,FTIR and SEM,and their crystal morphology and other characteristics were analyzed.A series of TiO₂-Sn O₂/hydrogel complexes were prepared by introducing the prepared TiO₂-Sn O₂ into polyacrylamide hydrogel system.The photocatalytic performance of composite hydrogel was tested,and the photocatalytic performance of methyl orange dye was improved compared with pure TiO₂/hydrogel.