Preparation Of Phenoilc Acid Hyper-cross-linked Ploymer Composites And Its Application Of Removing Organic Pollutans From Aqueous Solution

Water resources are the most precious resources on which human beings depend and face unprecedented challenges.Water pollution has become one of the most serious problems in the world.So far,millions of organic chemicals including pharmaceuticals,personal care products,pesticides,organic dyes and common organic chemicals have been discovered,synthesized or produced.The discharge of these organic compounds into the water caused the worsening of the water environment,which seriously threatened the health of the entire life and the environment.Therefore,many experts have developed treatment technologies for organic pollutants in different wastewaters,but most of the technologies have the disadvantages of high cost and high energy consumption.Among the numerous treatment technologies of wastewater pollutants,two treatment technologies have received much attention.One is adsorption.Adsorption is a special treatment technology of organic pollutants.It does not require any additional special equipment and is easy to carry out.At the end of the adsorption process,it will not produce additional harmful substances and cause secondary pollution to the water.The other is the activated persulfate advanced oxidation technology.Compared with hydroxyl radicals,the sulfate radicals obtained by activated persulfate have a wide pH range,long duration of free radicals,stable precursor oxidants,high free radical generation rate,and low cost.In this paper,the preparation of phenolic acid hyper-cross-linked polymer composites and its application for removing organic pollutants from aqueous solution were studied.A novel bifunctional(-COOH,-OH)phenolic super-crosslinked polymer was designed and prepared by Friedel-Crafts alkylation reaction and applied to the selective adsorption of cationic dyes in aqueous solution.A novel HCHCPs@Ag-x composite was prepared by in-situ reduction method,which was used as an activator to activate sodium persulfate for the catalytic degradation of tetracycline.The main experimental results were as follows:1.A novel HCHCPs was designed and prepared by Friedel-Crafts alkylation reaction for the selective adsorption of cationic dye.According to the fitting parameters of the Langmuir model,the maximum adsorption capacity of methylene blue on HCHCPs was 751.88 mg·g-1.The results showed that the second-order kinetic model fitted the experimental data better than the first-order kinetic model,and the Langmuir model was suitable for the adsorption of methylene blue by HCHCPs.The adsorption equilibrium time of methylene blue solution(100 mg·L-1)on HCHCPs was only 40 minutes,and the optimal pH for adsorption was 8.The results of selectivity experiments showed that HCHCPs had a high selectivity for methylene blue.At pH 8,methylene blue/acid red 91 and methylene blue/methyl orange mixtures had good efficiency of separation.In addition,thermodynamic studies indicated that the adsorption of methylene blue by HCHCPs was a spontaneous endothermic process.Due to the ΔH value was 23.79 kJ/mol,the adsorption of methylene blue by HCHCPs was more inclined to chemisorption.After five adsorption-desorption cycles,the amount of methylene blue adsorption did not decrease significantly.Therefore,HCHCPs had good adsorption properties for the cationic dye and was potential adsorbent for removing cationic dyes from aqueous solutions.2.In situ reduction method was used to synthesize Ag on the surface of HCHCPs to form HCHCPs@Ag-x composite material,which was used as a material for catalytic degradation of tetracycline.HCHCPs@Ag-2,HCHCPs@Ag-4,HCHCPs@Ag-6,HCHCPs@Ag-8,HCHCPs@Ag-10,and HCHCPs@Ag-12 composites were prepared from Tollens’ reagent(2 to 12 mg·mL-1).The degradation rates of activated sodium persulfate on catalytic degradation of tetracycline were 78.69%,95.65%,98.06%,95.17%,98.04%and 96.24%,respectively.The rate constants k(min-1)of catalytic degradation of tetracycline was 0.0134,0.0266,0.0317,0.0259,0.0418 and 0.0369,respectively.The results showed that HCHCPs@Ag-10 almost completely degraded tetracycline in the solution within 90 min,and the degradation rate was higher than that reported in the literature.