The Preparation Of Imide-bonded Porous Organic Polymer And Their Application In Photocatalytical Degradation Of Rhodamine B

In recent years,semiconductor-based photocatalysis technology has become one of the most potential colored wastewater treatment technology due to its high efficiency and sustainability.Porous organic polymers have the advantages of simple synthesis,excellent corrosion resistance,stable chemical structure and strong modifiable properties,which making them outstanding among many types of photocatalysis.Thus,two imide-bonded porous organic polymers were synthesized by the solvothermal method and their photocatalysis performance was verified by degrading Rhodamine B in colored wastewater.The research content is as follows:(1)POP-TAPB is designed and synthesized using 1,3,4-(triaminophenyl)benzene and pyromellitic dianhydride by the solvothermal method and was used for adsorption and photodegradation of Rhodamine B in colored wastewater.Through adsorption experiments,it was found that the adsorption process of Rhodamine B on POP-TAPB was conformed to the Freundlich isotherm type and the quasi-two-stage kinetic adsorption model,and its maximum equilibrium adsorption capacity for Rhodamine B is 86.35 mg·L^-1.The results of photocatalysis experiments showed that under the irradiation of xenon lamp,the removal rate of Rh B by POP-TAPB can reach 99.4%of the photocatalysis activity within 90 mins.The free radical trapping and quenching experiment verified that the photodegradation mechanism of Rh B was different under different p H conditions.In addition,ESI was used to detect the degradation path of POP-TAPB to Rh B under the optimal photocatalytic conditions,the result shown that the deethylation of Rh B was the process.(2)In order to explore the factors affecting the photocatalytic efficiency,tris(4-aminophenyl)amine and pyromellitic dianhydride were selected to synthesize the material POP-TAPA by solvothermal method,and the adsorption and photocatalytic activity of Rh B were studied.The results of adsorption studies shown that,different from the adsorption process of POP-TAPB for Rh B,the adsorption process on POP-TAPA conforms to the Langmuir isotherm type and the pseudo-second-order kinetic model,and the maximum equilibrium adsorption capacity is 59.73 mg·L^-1,due to the different adsorption effects based on the different specific surface area and pore size distribution of the material.In the photocatalysis control experiment,it is found that POP-TAPB has a higher photodegradation rate than POP-TAPA under the same conditions,which is closely related to the adsorption capacity of the material,the material band gap and the separation efficiency of electrons and holes.