Synthesis Of A Novel Hypercrosslinked Resin Via Photochlorination-alkylation And Its Adsorption Performance Study Of Phenol

Hypercrosslinked resins have become the hot topic of adsorption-separation ma-terials based on their excellent properties, such as the fine pore structure, high BET surface areas, high mechanical strength, good adsorption selectivity and good desorp-tion-regeneration properties, etc. However, due to their single skeleton structure (St-DVB matrix) and high cost, the broadening of their application field was limited at some extent.Based on the previous work in the lab, a combination of photochlorination of p-xylene and succedent Friedel-Crafts alkylation polymerization was firstly used in preparation of the hypercrosslinked resins, and the adsorptive behaviors of phenol from aqueous solution onto the titled resins were investigated. The concrete prepara-tion process of the hypercrosslinked resins was divided into two steps. The first one was the preparation of the mixed chlorinated p-xylene by the photochlorination of p-xylene. The gas phase and liquid phase photochlorination of p-xylene were studied using the GC, GC-MS methods in order to prepare mixed chlorinated p-xylene in which the content of p-xylylene dichloride was supreme; The second was the synthe-sis of the hypercrosslinked resins, which could be mainly classified into two ap-proaches:1) copolymerization of mixed chlorinated p-xylene with benzene or bi-phenyl; 2) self-polymerization of mixed chlorinated p-xylene.The chemical structure, BET surface area and micromorphology of the hyper-crosslinked resins were characterized by FT-IR, elementary analysis (EA) and BET respectively, and the synthesis mechanism was discussed. The results showed that the novel hypercrosslinked resins possess high BET surface (near to 905 m2/g), large pore volumes range from 0.1 to 1.3 cm3/g and narrow pore size distributions which were mainly in the range of micropores and small mesopores, and the element oxygen was contained in these resins, which was obtained by the hydrolysis or oxidation of the elemental chlorine.Adsorptive behaviors of phenol from aqueous solution onto the resins were researched. Experimental results showed that the adsorption capacity of phenol onto the resin GCCP-BE attained 171 mg/g in the investigative concentration range, which were higher than that of Amberlite XAD-4. The adsorption isotherms can be corre-lated to Freundlich and Langmuir isotherm. In the adsorption process, the formation of the hydrogen bonding force between the hydroxyl of adsorbent and-OH of phenol can increase the adsorption capacity of phenol. Kinetic datas were fitted to pseu-do-second-order models; the adsorption of phenol on the resins was spontaneous and exothermic. The kind of hypercrosslinked resin would be applied widely for resource management of wastewater containing phenolic compounds.