Preparation Of Acrylate-based Adsorption Resin And Study On Treatment Of Phenol Wastewater

With the rapid development of industrialization, the increased trend of industrial water was led to the wastewater increasing. Especially, phenol and its derivates are the common, high toxic and refractory substance in the industrial effluents, which attribute to a serious test for the economic system. Therefore, it is important for human beings to efficiently treat and purify the phenol-containing wastewater. At the same time, adsorption is one of the most effective purification and separation techniques for phenol removal from aqueous solution. Depending on adsorbent, it can absorb one or more contaminants and possessed the advantages of good treatment result, low cost, easy operation, recycle of valuable material and reutilization of the adsorbents.So in this paper, different functional monomers and cross-linking regent ethylene glycol dimethacrylate (EGDMA) were choosen to synthesize different kinds of acrylate adsorption resins which were applied to adsorb phenol in aqueous solution. The surface structure and properties were characterized. The main factors influencing adsorption performances were evaluated. The adsorption kinetic, isotherm and thermodynamic models were used to analysize the data derived from the adsorption process. The main conclusions are as following:(1)The sodium p-styrene sulfonate (SSS) containing ionic group -SO3- was successfully brought in the compolymerization of methyl methacrylate (MMA) and EGDMA by suspension polymerization. Based on the analysis of FT-IR?TGA?SEM and BET, the polymer MSE was a ionic, good heat resistance and macropore diameter 849.34 nm acrylate adsorbent. The optimum adsorption 58.29 mg/g was achieved when pH was 5, the contact time 180 min, the adsorbent dose 0.2 g, the initial concentration 3000 mg/L and the temperature 313 K. Experimental data showed a good fit with the pseudo-second-order kinetic model. The intra-particle diffusion analysis indicated that intra-particle diffusion was involved in the adsorption process but it was not the only rate-limiting step. Adsorption isotherms of phenol were linearly correlated and found to be well represented by the Freundlich model. Thermodynamic analysis indicated that the phenol removal on MSE was an endothermic, spontaneous and entropy increase process?(2)Based on hydrolysis, dehydration and condensation, the tetraethoxysilane (TEOS) and vinyltrimethoxy silane (VTMS) were composed of functional monomer containing SiO2 and further copolymerized with EGDMA. The chemically bonding, good heat resistance, average poere diameter 3.8 nm and surface area 293.90 m2/g of TVE were effectively characterized by FT-IR?TGA?SEM and BET. The optimum adsorption capacity 74.79 mg/g was achieved at pH=6, adsorbent dose 0.1 g, contact time 60 min, initial concentration 3000 mg/L and temperature 298 K. The pseudo first-order model can be well fitted with the kinetic process. The intra-particle diffusion analysis indicated that adsorption process was controlled by several diffusion steps. The Freundlich model gives a better fit to the experimental data that indicating multiply molecular adsorption for phenol, namely, physical adsorption. The calculated thermodynamic parameters indicate an exothermic and spontaneous process. A mixture desorption solvent containing lOmL methanol and lOmL deionized water can regenerate the TVE completely and it remained at 92.5% of the initial adsorption ability after five times of adsorption-desorption process, which indicated a good regeneration capacity.(3)Depending on the advantages of VTMS, it was copolymerized with EGDMA, then the process of hydrolysis and dehydration condensation of Si-OCH3 on polymeric matrix was carried out. According to the characterization of product, VE containing self-doped, good heat resistance and approximate micropore 2.54 nm was successfully synthesized. The maximum adsorption capacity 75.68 mg/g was achieved when pH was 6, adsorbent dose 0.1 g, contact time 60 min, initial concentration 3000 mg/L and the temperature 293 K. The adsorption kinetics followed the pseudo-second-order kinetic model, and the intra-particle diffusion was but not the only rate-limiting step. Adsorption isotherms of phenol were linearly correlated and found to be well represented by the Freundlich model. Thermodynamic parameters indicated that the adsorption process of phenol on VE was physical and exothermic, and the phenol molecules absorbed on the surface of VE were more disordered. A mixture desorption solvent containing 20 mL methanol and deionized water (v:v,1:1) can be used as eluting agent. After four regeneration recycles, the adsorption capacity of VE-resin remained at 95.04% of the initial value, which illustrated that it possessed excellent reusability and remarkable regeneration.