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Volume 41 Issue 2
Feb.  2023
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Article Navigation >  ENVIRONMENTAL ENGINEERING  > 2023  >  41(2): 66-72,81
LIU Dong, QI Junwen, XU Zunzhu, ZHANG Jiwen, JIN Xiaoxian, LI Jiansheng. ADSORPTION PERFORMANCE OF TOLUENE ON HYDROPHOBIC MODIFIED MOLECULAR SIEVES UNDER HIGH HUMIDITY[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(2): 66-72,81. doi: 10.13205/j.hjgc.202302010
Citation: LIU Dong, QI Junwen, XU Zunzhu, ZHANG Jiwen, JIN Xiaoxian, LI Jiansheng. ADSORPTION PERFORMANCE OF TOLUENE ON HYDROPHOBIC MODIFIED MOLECULAR SIEVES UNDER HIGH HUMIDITY[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(2): 66-72,81. doi: 10.13205/j.hjgc.202302010
shu

ADSORPTION PERFORMANCE OF TOLUENE ON HYDROPHOBIC MODIFIED MOLECULAR SIEVES UNDER HIGH HUMIDITY

doi: 10.13205/j.hjgc.202302010

  • 1. School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;

  • 2. Nanjing University Academy of Environmental Planning & Design Group, Nanjing 210093, China

  • Received Date: 2022-07-04
    Available Online: 2023-05-25
  • Publish Date: 2023-02-01
    Abstract
  • Engineering practice showed that the adsorption performance of Y molecular sieve was greatly reduced under high humidity environment. In this paper, Y@mesoSiO2 was obtained by pretreating polydiallyl dimethylammonium chloride (PDDA) along with the growth of mesoSiO2 shell on Y molecular sieve. Polydimethylsiloxane (PDMS) was further grafted onto mesoSiO2 shell to prepare Y@mesoSiO2-S via chemical vapor deposition method. The morphology and structure of the modified Y molecular sieve were analyzed by SEM, TEM, XRD, XPS, surface area and pore size analyzer. Besides, the adsorption of water and toluene was evaluated by static and dynamic adsorption experiments. The results showed that the mesoSiO2 shell successfully grew on the outer surface of Y molecular sieve and PDMS was successfully grafted onto the Y@mesoSiO2 shell. Compared with Y molecular sieve, the BET specific surface area (SBET) of Y@mesoSiO2-S increased by 2%; meanwhile, the water contact angle was enhanced significantly, causing the static water absorption decreased from 298 mg/g to 79 mg/g, and the dynamic water absorption decreased from 245 mg/g to 76 mg/g. The saturated adsorption capacity of toluene on Y@mesoSiO2-S and Y molecular sieve were 167.2 mg/g and 2.6 mg/g at an RH of 80%, respectively, which decreased by 6.7% and 98.3% relatively, compared with an RH of 20%. When compared with Y-S without mesoSiO2 shell, Y@mesoSiO2-S presented increased SBET and the saturated adsorption capacity of toluene with 46% and 51% at an RH of 80%, respectively. This indicated that mesoSiO2 shell was introduced between Y molecular sieve and PDMS, which could avoid clogging of porosity caused by direct grafting PDMS on the surface of Y molecular sieve. Furthermore, this strategy could improve the hydrophobic property of Y molecular sieve, resulting in enhanced adsorption performance on toluene under high humidity.
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    • References(24)
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