| Adsorption is considered to be one of efficient technology for the abatement of organic pollutants. In general, the adsorption technology that has advantages of simple operation, energy saving and high efficiency is widely used in the industry. The traditional active carbon and zeolites are widely used as adsorbent because of their high adsorption capacity. However, its development has been limited by some drawbacks such as added fire risk, pore clogging, hygroscopicity and a lack of regenerative ability. Therefore, there is still an urgent call for a novel and efficient material with a considerable adsorption capacity, hydrophobicity and stable performance.For the adsorption of organic pollutants in oily waste water, a novel superhydrophobic polydivinylbenzene (PDVB) resin was synthesized by solvothermal process. Adsorption and regeneration performance of PDVB resin for oily waste water was investigated, and then compared with active carbon. The results showed that PDVB resin has better adsorption property and adsorption rate. For instance, the adsorption capacity of toluene on PDVB resin is 10.99 g/g, which is 16.91 times higher than that of activated carbon. Adsorption capacity of benzene on PDVB resin is 6.15 g/g, which is 6.23 times higher than that of activated carbon. Moreover, PDVB resin can be efficiently regenerated under a temperature of 110℃.For the adsorption of polar organic pollutants such as phenol, polymer resins (PDMA and PDVB) were prepared by suspension polymerization and solvothermal method using divinylbenzene (DVB) and methyl methacrylate (MMA) as monomers, respectively. Adsorption performances of phenol on these resins were investigated. The results showed that DVB-MMA copolymer resin prepared by suspension polymerization has larger pore size distribution of 2-4nm and 5-30nm, higher surface area of 566 m2/g. The adsorption capacity of phenol on DVB-MMA copolymer (PDMA-XF) can be achieved to 170.4 mg/g at concentration of 4500 mg/L, a strong interaction between the oxygen atoms of ester carbonyl and hydrogen atoms of the phenolic hydroxyl would result in high adsorption capacity of phenol.For the adsorption of volatile organic compouds (VOCs) in gas phase, a novel superhydrophobic nanoporous PDVB-Silica adsorbent (PDVB/R-SiO2) was successfully prepared. Through silanization hydrophobic modification on the pore of silica gel, divinylbenzene (DVB) monomer was adsorbed into the pore and then reacted under solvothermal condition. As a result, porous poly (divinylbenzene) (PDVB) resin was polymerized in the hole of the silica gel, which made this organic-inorganic material had specific bimodal pore size distribution of both micro pore (0.5-2.0nm) and meso-macropore (30-60nm). The adsorption performance of toluene on PDVB/R-SiO2 was investigated under high humid gas stream and the regeneration ability by breakthrough test. Comparing with pure silica gel, it was found that the surface area of PDVB/R-SiO2 was increased 1.5 times, the average pore diameter was shrinked from 30 nm to 10 nm, the water contact angle was increased from 0° to 117.3°. The adsorption capacity of toluene on PDVB/R-SiO2 is raised by 11 times higher than that on silica gel at medium-low concentration, meanwhile the adsorption performance of toluene was hardly affected by water vapor. PDVB/R-SiO2 can be efficiently regenerated under the temperature of 120℃. Therefore, PDVB/R-SiO2 may have a great potential in continuous rotary wheel removal of VOCs. |
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