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- W3204128300 abstract "The commercial Hβ (25, 50), HY (11) and HZSM-5(50) were dealuminated by acid leaching and subsequent calcination to improve their hydrophobic nature for the removal of bisphenol A (BPA). The structure and properties of the raw zeolites and the modified ones (labelled as T-Hβ (25, 50), T-HY (11), T-HZSM-5(50)) have been investigated comparatively by XRD, BET, SEM, XRF and contact angle test (CA). The results indicated that HY (11) and T-HY (11) had poor adsorption capacity for hydrophobic BPA because of destroyed crystalline phase of T-HY (11) and hydrophilic nature of HY (11). HZSM-5(50) and T-HZSM-5(50) also had poor adsorption ability for BPA molecules because larger BPA molecules cannot enter smaller pores of HZSM-5(50) and T-HZSM-5(50). However, the T-Hβ (25, 50) zeolites exhibited significantly higher adsorption capacity for BPA because their larger pore size remained than molecule size of BPA and larger water contact angles and molar ratios of SiO 2 /Al 2 O 3 of T-Hβ (25, 50) than Hβ (25, 50), respectively. BPA removal mechanism study showed that hydrophobic interaction force between BPA and T-Hβ (25, 50) should be a main driving force. The adsorption process conformed to pseudo-second order model and the three-parameter Redlich-Peterson model. The adsorption rate of BPA over T-Hβ (50) (0.01050 g mg −1 min −1 ) was 2.29 times faster than that over Hβ (50) (0.004581 g mg −1 min −1 ), and the maximum adsorption capacity of BPA on T-Hβ (50) (117.62 mg g −1 ) was 3.5 times than that on Hβ (50) (33.78 mg g −1 ). The acid treatment-calcination method is feasible and appropriate for modification of Hβ in order to remove hydrophobic organic pollutants. Three kinds of commercial zeolites including Hβ (25,50), HY (11) and H-ZSM-5 (50) were modified by acid leaching and calcination method to obtain dealuminated zeolites (T-Hβ (25,50), T-HY (11), T-H-ZSM-5(50)), whose structures and adsorption mechanism for hydrophobic bisphenol A were investigated comparatively. • Acid leaching-calcination method was feasible for dealumination of Hβ among three zeolites. • The SiO 2 /Al 2 O 3 molar ratio of Hβ was improved greatly. • The maximum adsorption capacity of BPA on T-Hβ (50) (117.62 mg g −1 ) was 3.5 times than that on Hβ (50). • The hydrophobic interaction force between BPA and T-Hβ (50) was responsible for the BPA removal." @default.
- W3204128300 created "2021-10-11" @default.
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- W3204128300 date "2022-01-01" @default.
- W3204128300 modified "2023-10-15" @default.
- W3204128300 title "The dealuminated zeolites via acid leaching and followed calcination method for removal of hydrophobic bisphenol A" @default.
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- W3204128300 doi "https://doi.org/10.1016/j.jssc.2021.122640" @default.
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