| Nowadays,although the rapid development of industry has brought good news to mankind,the discharge of industrial waste gas,waste water and waste residue has seriously polluted the living environment of mankind and threatened the ecological balance.Among them,the organic wastewater discharged by the dye industry not only deteriorates the water quality and deepens the color,but also the dye with stable and complex structure has potential carcinogenicity to humans.Therefore,searching for new technologies and advanced materials to treat industrial organic wastewater has become a hot research topic.In recent years,the vigorous development in the field of materials shows that porous organic polymers have played an important role in many mature applications and emerging technologies due to their large surface area,open channels and controlled pore environment,including gas separation,catalysis,medicine and other fields.Based on this,two cases of porous organic polymers were designed and synthesized in this paper,FePPOP-1 and Hazo-POP-SO3H,which were used to degrade organic dyes by photo-fenton reaction and selective adsorption of cationic dyes,respectively.The specific research contents are summarized as follows:We successfully synthesized a metalloporphyrin-based porous organic polymer(FePPOP-1)by the Sonogashira cross-coupling reaction between FeTBrPP and TEPB.UV-vis absorption spectra showed FePPOP-1 exhibits a significant coverage of the natural solar irradiance spectrum.As a result,the prepared FePPOP-1 has a significantly enhanced photocatalytic activity for the visible-light-driven degradation of methylene blue(MB).By using only 4 mg of FePPOP-1 as a catalyst,it was found that 50 mL of organic wastewater containing 70 ppm MB could be totally degraded in 80 min even at neutral pH.The effects of the initial MB,H2O2 concentrations,pH value and common ions on MB degradation were studied in detail.The ROS in this system are determined by chemical method,quencher method and electron spin resonance method.Both the catalytic mechanism of FePPOP-1 and the degradation route of MB were also proposed.We successfully synthesized porous organic polymer(Hazo-POP-1)containing phenolic hydroxyl groups by the diazo-coupling reaction between pyrogallol and biphenyldiamine.Hazo-POP-SO3H with hydrophilic and negatively charged sulfonic acid groups was obtained by further reaction of Hazo-POP-1 with chlorosulfonic acid.Compared with Hazo-POP-1,the sulfonated Hazo-POP-SO3H has a significant increase in the amount and rate of MB adsorption.By studying the adsorption capacity of Hazo-POP-SO3H to MB at different temperatures,the thermodynamic parameters are obtained and the Gibbs free energy is less than zero,which proves that the adsorption process is spontaneous.When simulating the actual organic wastewater flow process,Hazo-POP-SO3H also achieved effective adsorption of MB.The green synthesis method of the precursor and a simple post-modification method can obtain Hazo-POP-SO3H with higher MB adsorption capacity.Therefore,the Hazo-POP-SO3H synthesized by this strategy is expected to be used in wastewater treatment. |
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