Punica granatum mediated green synthesis of cauliflower-like ZnO and decorated with bovine bone-derived hydroxyapatite for expeditious visible light photocatalytic antibacterial, antibiofilm and antioxidant activities. Issue 4 (August 2021)

• Record Type: Journal Article
• Authors: Sin, Jin-Chung; Quek, JianAi; Lam, Sze-Mun; Zeng, Honghu; Lin, Hua; Li, Haixiang; Tham, Kai-Onn; Mohamed, Abdul Rahman; Lim, Jun-Wei
• Is Part Of: Journal of environmental chemical engineering. Volume 9:Issue 4(2021)
• Publication Date: 2021-08
• Subjects: ZnO -- Hydroxyapatite -- Photocatalysis -- Antibacterial -- Antibiofilm -- Antioxidant; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.105736
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: In this work, novel Punica granatum peel extract-derived cauliflower-like ZnO decorated with bovine bone-derived hydroxyapatite (ZnO/HAP) composites were successfully synthesized via a facile eco-friendly method. Numerous analytical characterization methods were utilized to investigate the structural, morphological and optical properties of synthesized photocatalysts. Under visible light irradiation, the as-synthesized ZnO/HAP-5 composite demonstrated the highest antibacterial activity against Enterococcus faecalis ( E. faecalis ) among all the tested products. The exceptional antibacterial performance of synthesized ZnO/HAP-5 composite was also noticed through the K + and protein leakage, bacterial morphological change and cellular substance alteration. Additionally, catalyst recycling and bacterial regrowth experiments were conducted to determine the practicability of as-synthesized products in photocatalytic disinfection. The photocatalytic improvement of ZnO/HAP-5 composite can be ascribed to the efficient charge carrier separation and high H2 O2 generation. Furthermore, the excellent antibiofilm performance of ZnO/HAP-5 composite was verified with microscopic examination, exopolysaccharides reduction and hydrophobicity index decline in E. faecalis biofilm. Finally, the synthesized ZnO/HAP-5 composite was found to inhibit the activity of 2, 2-diphenyl-1-picrylhydrazyl (DPPH) free radicals efficiently. This work shed a light on the conversion of agricultural wastes into efficient photocatalytic materials for safe and practical water disinfection applications. Graphical Abstract: ga1 Highlights: Novel ZnO/HAP composites were prepared via a green and economically viable way. ZnO/HAP had multifunctional ability in antibacterial, antibiofilm and antioxidant. Photoinactivation of bacteria due to ROS generation and membrane damage. Antibiofilm was proved by microscopic test, EPS drop and low hydrophobicity index. Good antioxidant capability to DPPH scavenger activity.