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Green synthesis of spongy Nano-ZnO productive of hydroxyl radicals for unconventional solar-driven photocatalytic remediation of antibiotic enriched wastewater
- Source :
- Journal of Environmental Management. 271:110961
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- Herein, novel green/facile approach to synthesize spongy defective zinc oxide nanoparticles (ZnONPs) is presented using for the first time pomegranate seeds molasses as a green capping fuel/reducing mediator during an aqueous solution combustion process. The developed ZnONPs is characterized by UV–Vis. Spectrophotometry and fluorimetry, XRD, Raman spectroscopy, SEM, TEM and BET. Interestingly, pomegranate seeds molasses within a viable content of bio-capping molecules reveal a defective nanoporous ZnO NPs of smaller particle size, greater pore size/volume, and higher surface area compared to the bulky non-biogenic ZnONPs. Moreover, the biosynthesized defective ZnONPs showed narrowed band gap and higher absorption of visible photons that breed higher density of hydroxyl radicals (•OH) under Solar-illumination. Even further, the bulk ZnO and the biosynthesized ZnO photocatalysts were examined in photodegrading flumequine (FL) antibiotic. The bulk ZnO gives 41.46% photodegradation efficiency compared to 97.6% for the biosynthesized ZnO. In highly acidic or highly alkaline media, FL photodegradability is greatly retarded. Scavenging experiment infers considerable contribution of holes over electrons in photodegradation reaction. The biosynthesized ZnO shows high durability in FL photodegradation after four reusing cycles. These promising findings highlight new insights for biogenic synthesis of tuned size/controlled morphology semiconductor NPs relevant to environmental remediation applications.
- Subjects :
- Environmental Engineering
0208 environmental biotechnology
chemistry.chemical_element
Nanoparticle
02 engineering and technology
Zinc
Wastewater
010501 environmental sciences
Management, Monitoring, Policy and Law
01 natural sciences
chemistry.chemical_compound
Photodegradation
Waste Management and Disposal
0105 earth and related environmental sciences
Aqueous solution
Hydroxyl Radical
Plant Extracts
Nanoporous
General Medicine
Anti-Bacterial Agents
020801 environmental engineering
chemistry
Chemical engineering
Photocatalysis
Hydroxyl radical
Particle size
Zinc Oxide
Subjects
Details
- ISSN :
- 03014797
- Volume :
- 271
- Database :
- OpenAIRE
- Journal :
- Journal of Environmental Management
- Accession number :
- edsair.doi.dedup.....d77ae44463e28c5341801e4cfdadf5f9