Visible light-driven ZnCr double layer oxide photocatalyst composites with fly ashes for the degradation of ciprofloxacin. Issue 1 (February 2022)

• Record Type: Journal Article
• Authors: Chuaicham, Chitiphon; Inoue, Takumi; Balakumar, Vellaichamy; Tian, Quanzhi; Ohtani, Bunsho; Sasaki, Keiko
• Is Part Of: Journal of environmental chemical engineering. Volume 10:Issue 1(2022)
• Publication Date: 2022-02
• Subjects: Photocatalyst -- Fly ash -- Composite -- Visible light -- Layered double oxides -- Ciprofloxacin; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.106970
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Zn-Cr layered double oxide/fly ash (ZnCrLDO/FA) composites were synthesized using three different fly ashes (YEM, DAT, PAN) as photocatalysts for the degradation of ciprofloxacin through in situ coprecipitation followed by calcination. Ciprofloxacin (10 mg/L) was completely decomposed more than 98% within 120 min by ZnCrLDO/YEM composites in aqueous conditions, which indicates that the heterojunction between ZnCrLDO and YEM may help electrons move easily to enhance the separation of the electron-hole pairs. Based on the XPS results for the three fly ash samples, the largest Fe and Ti content was detected on the YEM, which suggests that TiO2, Fe2 O3 on the surface of fly ash are responsible for the heterojunction. Furthermore, the ERDT pattern of ZnCrLDO/YEM confirmed the formation of new electronic levels that may avoid the recombination of electron-hole pairs, which leads to the enhancement of photocatalytic performance. These results show that fly ash is essential as supporting material to avoid the agglomeration of ZnCrLDO particles and as an electron carrier for enhancing the mobility of photogenerated electrons in photocatalyst composites. Graphical Abstract: ga1 Highlights: Fly ash act as a template to avoid the agglomeration of Zn-Cr layered double oxide and enhance charge separation. Energy-resolved distribution of electron trap results reveal the formation of new electron trap state in the composite. The new electron trap state avoid the charge recombination, leading to enhancing the degradation of CIP. The formation of heterojunctions between fly ash and Zn-Cr layered double oxide improved photocatalytic CIP degradation.