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摘要
Aiming to avert the sharp decrease of the adsorption capacity of molecular sieves for VOCs under high humidity conditions, a hydrophobic ZSM-5 was synthesized by optimizing the liquid phase deposition method. Instead of toluene, ethanol was selected as the modification solvent because of the cost-effectiveness and the environmentally friendly character. Modification effects of these two agents were compared and the hydrophobic ZSM-5 was prepared through the optimal protocols. Adsorption performance of the adsorbent for the simulated high humidity organic waste gas was investigated and the physicochemical properties were characterized with the help of various techniques, such as SEM, XRD, FTIR, nitrogen adsorption/desorption, and water contact angle. Experimental results show that as a dispersant, ethanol can remarkably improve the hydrophobicity of the molecular sieve, of which the improvement effect was more significant than that of toluene. Under optimal modification conditions, the toluene saturated adsorption capacity of the ZSM-5-E0 modified by ethanol can reach 81.9 mg·g-1 under 90% humidity, which was much higher than that of the pristine sample and 3 times that of the ZSM-5-T0 modified by toluene. After four cycles of adsorption and desorption test, the adsorption capacity for toluene of ZSM-5-E0 was still greater than 90%. The toluene isothermal adsorption of ZSM-5-E0 fit the Langmuir model well. In sum, the ZSM-5-E0 modified by ethanol demonstrated excellent VOCs adsorption and desorption performance, which signified a potential application prospect. ? 2022, Science Press. All right reserved.
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