Bacterial cellulose flakes loaded with Bi2MoO6 nanoparticles and quantum dots for the photodegradation of antibiotic and dye pollutants. (January 2023)

• Record Type: Journal Article
• Authors: Xu, Mengying; Deng, Yichao; Li, Shanhu; Zheng, Jingyan; Liu, Jieyu; Tremblay, Pier-Luc; Zhang, Tian
• Is Part Of: Chemosphere. Volume 312:Part 1(2023)
• Publication Date: 2023-01
• Subjects: Bi2MoO6 nanoparticle -- Quantum dot -- Bacterial cellulose -- Photodegradation -- Antibiotic -- Dye; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2022.137249
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Effective strategies to improve charge separation in semiconductor particles are critical for improving the photodegradation of organic pollutants at levels sufficient for environmental applications. Herein, Bi2 MoO6 (BMOMOF ), comprising both nanoparticles (NPs) and quantum dots (QDs), was synthesized from a bismuth-based metal-organic framework (Bi-MOF) precursor. Surface defects on BMOMOF, the combination of NPs and QDs, and modified energy band edges improved photogenerated charge separation and facilitated redox reactions. When compared to BMO derived from uncoordinated Bi, the BMOMOF photocatalyst (PC) was more efficient at photodegrading tetracycline hydrochloride (TCH) and ciprofloxacin (CIP), two widely-used antibiotics ubiquitous in wastewater, as well as the carcinogenic pollutant rhodamine B (RhB). BMOMOF was then loaded on the biopolymer bacterial cellulose (BC) to further enhance photocatalytic performance and facilitate the recovery of the PC after water treatment processes. The novel BMOMOF /BC photocatalytic flakes were significantly larger than pure BMOMOF, and thus easier to recuperate. Furthermore, anchoring BMOMOF on BC flakes augmented significantly the photodegradation of TCH, CIP, and RhB, mainly because hydroxyl groups in BC act as hole traps facilitating photogenerated electron-hole separation. Results obtained with BMOMOF /BC highlight promising approaches to develop optimal PCs for aqueous pollutants degradation. Graphical abstract: Image 1 Highlights: Bi2 MoO6 (BMO) was synthesized from a bismuth metal-organic framework precursor. BMOMOF comprised nanoparticles with defects and quantum dots. BMOMOF was anchored on large bacterial cellulose flakes easy to recover from water. Versatile BMOMOF /BC photodegrades efficiently both persistent antibiotics and dyes. BMOMOF /BC was stable under visible light with most pollutants.