| People are paying more and more attention to environmental pollution at present,and water pollution has become the primary problem.Among them,the pollution of organic matter in water bodies is seriously damaging the ecosystem and endangering human health due to its high toxicity,strong accumulation and refractory degradation.It is the focus of current water environmental problems.There are many treatment methods for organic pollutants in water,including electrolysis,adsorption,photochemical oxidation,etc.Among them,the adsorption method is mostly concerned by researchers in the aspect of solving soluble organic pollution in water environment.The hot issue of current research is to explore the adsorbent with low cost and excellent adsorption effect.In recent years,with the introduction of super crosslinked polymers,the types of solid adsorbents have shown a trend of diversity.This article reviews the preparation of traditional supercrosslinked polymers,which uses simple compounds as monomers.Under the simple conditions,a novel super-crosslinked polymer with high adsorption rate to organic pollutants and low production cost was obtained by Friedel-Crafts alkylation reaction.The novel substance was named SCP according to the super-crosslinked polymer nomenclature.The new product SCP was characterized and analyzed,and the adsorption and adsorption mechanisms of two typical soluble organic pollutants(bisphenol A and tetracycline)in water environment pollution were discussed.Based on the above experimental results,it is concluded that the newly synthesized super-crosslinked polymer SCP has great application potential in the treatment of soluble organic pollutants in water environment,and provides a reference for the industrial production of new solid adsorbents.It is of great significance for the treatment of polluted water bodies.The main contents of this paper are as following:(1)The material for synthesizing the novel super-crosslinked polymer SCP chooses2-aminobenzimidazole as the raw material;1,4-p-dichlorobenzyl is selected as the crosslinking agent;1,2-dichloroethane is selected as the solvent;and the catalystchooses anhydrous ferric chloride.hermogravimetric analysis(TG/DSC)results show that it has good thermal stability at 800 °C;The results of infrared spectroscopy(FTIR)show that there are several characteristic peaks of supercrosslinked polymers in the product;X-ray diffraction analysis(XRD)results show that the product is an amorphous crystal structure.The above results show that the prepared product has the characteristics of super crosslinked polymer,and the new substance is successfully synthesized.(2)The optimal conditions for the adsorption of bisphenol A by SCP are: pH=10.16,the dosage is 0.4g/L,and the adsorption equilibrium time is 120 min.The quasi-secondary reaction kinetics model on the kinetics and the Freundlich isotherm adsorption equation on thermodynamics are more in line with the adsorption mechanism of SCP on bisphenol A.Adsorption was carried out at 35 ° C,45 ° C,and 55 ° C,respectively.The results showed that the higher the temperature is and the higher the adsorption amount is,the better the adsorption effect is.he thermodynamic parameters were analyzed,?G<0,?H>0,?S>0,indicating that the adsorption is a spontaneous endothermic process.(3)The optimal adsorption conditions of SCP for tetracycline are: pH=10.16,dosage is 0.4g/L,and adsorption equilibrium time is 180 min.The quasi-secondary reaction kinetics model on the kinetics and the Freundlich isotherm adsorption equation on thermodynamics are more in line with the adsorption mechanism of SCP on tetracycline.Adsorption was carried out at 35?,45?,and 55?,respectively.The results showed that the higher the temperature is and the higher the adsorption amount is,the better the adsorption effect is.The thermodynamic parameters were analyzed,?G<0,?H>0,?S>0,indicating that the adsorption is a spontaneous endothermic process.(4)The regeneration of SCP after adsorption of bisphenol A and tetracycline was investigated,and the optimal regeneration time was determined to be 2 h.The regeneration operation was repeated 5 times,and the removal rate of SCP declined only10% for bisphenol A and only 11% for tetracycline.The comprehensive results showthat SCP shows good regeneration performance.(5)The characterization analysis of bisphenol A and tetracycline by FTIR was carried out.The results showed that the intensity of several characteristic peaks increased after adsorption of pollutants,and the positions of absorption peaks did not change,indicating that bisphenol Both A and tetracycline have been successfully adsorbed on the SCP;XRD was used to characterize and analyze the adsorption of bisphenol A and tetracycline,and all of them showed obvious taro-type characteristic peaks are at the same position,indicating that SCP still maintains amorphous crystal structure after adsorption and the adsorption process is only carried out on the surface of SCP. |
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