Preparation Of Novel Photo-catalytic And Adsorbing Materials Using For The Treatment Of Dyestuff Polluted Water

With the rapid development of industry,more and more organic dyes are widely used in scientific experiments and industry.The release of organic dyes into the water body can cause serious pollution and hazards to the environment.Therefore,various materials which are used for the degradation and adsorption of organic dyes have become necessary and urgent.At present,some materials which can degrade organic dyes have been successfully explored by researcherss.Meanwhile,a series photo degrading/absorbing materials and porous polymers are prepared for the photo-degradation and absorption of organic dyestuffs.TiO₂-CdS/polymer nano film and porous ZnS-ZnO films have drawn much attention for their favored properties such as photodegradation performance,chemical stability,and nontoxicity.In addition,porous organic polymers have been paid wide attention because they have special functional groups and large surface area,which can promote the absorbing efficiency of organic dyestuffs.In this paper,three kinds of materials were prepared using different methods.First,TiO₂/PVA composite nano-fiber mat was prepared via an electro-spinning technology.TiO₂ particles bearing–SH groups and PVA solution were injected through a co-axial syringe,TiO₂/PVA composite nano-fiber mat was obtained first.And then,the as-prepared SH-TiO_2/PVA composite nano-fiber mat was immersed in Cd²⁺cation solution and S^2-anion solution in turn.Thus,yellow TiO₂@CdS/PVA composite nano-fiber mats were prepared accordingly.By adjusting the immersing times in the Cd²⁺and S^2-solutions,different amounts of CdS particles attaching on the mats were obtained.Both TiO₂/PVA and TiO₂@CdS/PVA composite nano-fiber mats were employed to catalyse the photo-degradation of a model dye,methylene blue.The photo-degradation performance could be greatly enhanced by the introduction of CdS particles anchoring onto TiO₂ particles.The photo-degradation efficiency can reach to87.5%within 135min.Also,the nano-fiber mat could be recycled and reused for many times.The photo-degradation efficiency of TiO₂@CdS/PVA composite nano-fiber mats still remained 78.4%for 5 cycles.Secondly,Porous organic polymers（POPs）were obtained by two steps reaction.First step,using Suzuki-Miyaura coupling reaction prepare di-aldehyde compounds.And second step,using the Schiff’s base reaction prepared dialdehyde compounds.The POPs are layer sheet structured and crystallinet.They are studied by FTIR,UV-Vis,XRD,TEM,SEM,DSC and TGA.The pore parameters were tested,such as pore diameters and specific surface areas of the POPs could be changed by adjusting the reaction temperature and time.The specific surface areas of POPs increased with the increasing of reaction temperature and time.The maximum of specific surface area could reach 715.6 m²/g.Furthermore,the POPs could absorb rhodamine B and methylene blue model dyes,they have high efficiency within 5min.Thirdly,a family of MCPs was prepared by Suzuki–Miyaura coupling reaction using different building blocks.Micro/mesoporous conjugated polymers（MCPs）incorporate fluorescence,adsorption and electronic conductivity together.They were studied by FTIR,solid-state ¹³C NMR spectra,UV-Vis,SEM and BET.The as-prepared MCPs are of porous structure and fluorescence.The pore diameters and specific surface areas varied by changing the starting monomers.The MCPs could be linear chain and network structure depending on the starting monomers.The specific surface areas of network MCPs are larger than linear chain ones.The MCPs could be used as adsorbent for separation of organic dyes.Meanwhile,when MCPs were used for the removal of organic dyes,the adsorption capability of MCP-4 reached 488 mg/g and 491 mg/g for MB and RhB within 30 min respectively.With the introduction of N,S atoms to the building blocks,the removal ability were enhanced.Furthermore,the MCP family owns electric conductivity which may be employed as solar cell materials.