Journal
OPTIK
Volume 260, Issue -, Pages -Publisher
ELSEVIER GMBH
DOI: 10.1016/j.ijleo.2022.169098
Keywords
CuO; Nb2O5; WO3; Peony-like ZnO; Heterojunction; Photocatalytic degradation; Industrial wastewater treatment
Categories
Funding
- Ministry of Higher Education of Malaysia (MoHE) through Fundamental Research Grant Scheme, Malaysia [FRGS/1/2019/TK02/UTAR/02/4]
- Universiti Tunku Abdul Rahman, Malaysia [UTARRF/2020-C1/S04, UTARRF/2020-C2/L02]
- Guangxi Key Laboratory of Theory and Technology for Environmental Pollution Control, China [1801K012, 1801K013]
- special funding for Guangxi Bagui Scholar Construction Project, China
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A series of transition metal oxide nanoparticles decorated on peony-like hierarchical porous ZnO were synthesized, and their photocatalytic effectiveness for palm oil mill effluent (POME) degradation was investigated. Among them, the Nb2O5/ZnO composite showed the best photo degradation efficiency and stability. The method of constructing these heterojunction composites provides a new perspective for designing highly effective photocatalytic systems for industrial wastewater treatment.
A series of transition metal oxide nanoparticles decorated on peony-like hierarchical porous ZnO (MO/ZnO, where MO = CuO, WO3 and Nb2O5) was synthesized using a precipitation-ultrasonic method. The X-ray diffraction, energy dispersive X-ray and fourier-transform infrared spectroscopy findings indicated the existence of both MO and ZnO in the composites. The field-emission scanning electron microscope and transmission electron microscope observations revealed that the MO nanoparticles were well dispersed onto peony-like ZnO hierarchical microstructure. Furthermore, the enhanced visible light absorption abilities of MO/ZnO were confirmed by UV-vis diffuse reflectance spectroscopy. The photocatalytic effectiveness of MO/ZnO was investigated by palm oil mill effluent (POME) degradation under UV irradiation. Among them, Nb2O5/ZnO composite exhibited the best photo degradation efficiency (91.7%) and the highest rate constant (0.0102 min(-1)) after 240 min irradiation. Moreover, a complete decolorization of POME was observed after 30 min irradiation using Nb2O5/ZnO composite. The phytotoxic effects of POME against the Vigna radiata seeds also reduced greatly after photocatalytically treated using Nb2O5/ZnO composite. Meantime, the product revealed great photocatalytic stability with the degradation efficiency retained more than 80% after 4 cycles. The radical trapping experiment demonstrated that hydroxyl radical and photogenerated hole played major role in POME degradation. The outstanding photoactivity of Nb2O5/ZnO composite can be explicated by efficient charge separation between Nb2O5 and ZnO where the evidence can be obtained from photoluminescence and terephthalic acid-photoluminescence probing analyses. The present study to construct these heterojunction composites can provide an innovative view to design highly effective photocatalytic system for the treatment of industrial wastewater.
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