Preparation Of Catalyst For The Degradation Of Dyes Using The Micelle Of Polyether Modified Polysiloxane

Organic dyes are widely used in textile printing and dyeing industry,however,the removal of wastewater has been a long-term focus of the field of textile printing and dyeing.Particularly,advanced oxidation process is a main research direction.So,the research and development of various effective catalyst of dye degradation is also a research topics now.In view of the unique surface activity of amphiphilic polyether modified silicone oil,an innovative work was carried out in this paper using polyether modified silicone oil as the micro-or nano-reactor for the preparation of catalyst in situ for dye degradation.In this paper,a series of polyether modified polysiloxane with different chemical components were synthesized by hydrosilylation reaction and we studied the self-assembly behavior of amphiphilic copolymers.The influence of different factors on the morphology of aggregation were investigated.We obtained catalyst Co3O4/SiO2 by forming micelles as micro-or nano-reactor and calcined,which was used to study of methyl orange degradation.The main results are shown as follow:1.We obtained a series of polyether modified polysiloxane(PDMS-g-PEO/PO)with different chemical components.(1)By hydrosilylation reaction,different amphiphilic graft copolymers with polysiloxane as main chain and polyether as the side chain are prepared at a reaction temperature of 60 °C in this work.(2)The structure of graft copolymers were also confirmed by FTIR and1H-NMR measurement.2.The micellization of amphiphilic PDMS-g-PEO/PO graft copolymers were carried out and some self-assembled morphologies of spheres,rod-like aggregates or vesicles were obtained.(1)The critical micelle concentration(CMC)of PDMS-g-PEO was measured by fluorescence spectroscopy using pyrene as a fluorescence probe.The critical micelleconcentration changing with chemical components were studied.The results showed that the longer the hydrophobic siloxane chain segment,the more hydrophilic polyether chain segment,the greater its critical micelle concentration.The critical micelle concentration value of polymer in the mixed solvent of acetone and water is larger than in aqueous solution.(2)By using TEM characterization methods,we studied the influence of copolymer composition,aging time,solvent and time on molecular aggregation.The results showed that with the extension of aging time,small vesicles(spherical)were converted into big vesicle or composite vesicles.As the temperature is increased,spherical micelles were transformed into rod-like aggregates,as well as the size also increases further.In different solvent,the micellization behavior is also different.3.We obtained catalyst Co3O4/SiO2 by forming micelles as micro-or nano-reactor and calcined.(1)We investigated the morphology,element and crystal structure of catalyst by using TEM,XPS and XRD.Compared with without catalyst,the degradation rate of methyl orange was obviously improved after adding the catalyst.(2)We studied the effect of calcining temperature,calcining time and stirring speed on the performance of catalyst.The results show that calcination temperature700 °C,calcination time 5h,stirring speed 500r/min,the performance of catalyst is good.(3)The catalytic performance of Co3O4/SiO2 was further examined toward the oxidation of other organic dyes.The catalytic studies suggest Co3O4/SiO2 catalyst can efficiently catalytically oxidized most common dyes,such as acid and reactive dyes.