In:
Environmental Science: Nano, Royal Society of Chemistry (RSC), Vol. 9, No. 10 ( 2022), p. 3973-3991
Abstract:
This work reports a comprehensive study on the mechanisms for material formation, charge separation, persulfate activation, and photocatalytic degradation of fluoroquinolone antibiotics ( e.g. , ofloxacin (OFX), levofloxacin (LFX), and ciprofloxacin (CFX)) under LED visible light using the ZIF-8@Bi 2 MoO 6 (BIZ) heterojunction. The BIZ heterojunction was synthesized by the combination of solvothermal and sol–gel methods and characterized by SEM, TEM, XRD, EDX, FTIR, PL, EIS, BET, TGA, and UV-vis DRS analyses. The results show that using 500 mg L −1 BIZ (10% ZIF-8) with 500 mg L −1 Na 2 S 2 O 8 , at unadjusted pH for 25 min of irradiation results in an excellent photocatalytic activity with a degradation efficiency of 56.52% CFX, 85.70% LFX, and 96.36% OFX. The OFX degradation rate constant by BIZ was 3.2 and 23.3 times higher than those by Bi 2 MoO 6 and ZIF-8, respectively. These high efficiencies are attributed to the high charge separation rates for the photo-generated carriers in the heterojunction structure. The activity of radicals in the photocatalytic process as well as their role in the OFX removal was in the order of SO 4 ˙ − 〉 O 2 ˙ − 〉 h + 〉 1 O 2 〉 HO˙. The mechanisms of charge separation, persulfate activation, and degradation pathway were then proposed for the photocatalytic removal of OFX using the BIZ heterojunction under visible light.
Type of Medium:
Online Resource
ISSN:
2051-8153
,
2051-8161
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
2758235-8
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