Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 241, Issue -, Pages 359-366Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2018.09.048
Keywords
Chlorophyll; Cu/ZnO; RhB degradation; Visible light; Green catalyst
Funding
- Kasetsart University Research and Development Institute (KURDI)
- Center of Excellence on Petrochemical and Materials Technology (PETROMAT)
- [IRG5980004]
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The photocatalytic degradation of rhodamine B (RhB) over chlorophyll-Cu co-modified ZnO catalysts (Chl-Cu/ZnO) was studied under visible-light irradiation. It was found that chlorophyll as an electron donor and copper in Cu2+ form help inhibit the recombination of electron-hole pairs and improve photoactivity of the catalyst. The synergistic effect between chlorophyll and Cu was found to improve visible-light response of ZnO nanoparticles, resulting in excellent performance in photodegradation of RhB. The appropriate ratio of chlorophyll and Cu loadings over ZnO was 0.5Chl-0.10Cu/ZnO-at this ratio, under visible-light irradiation of 2 h, the degradation efficiency was approximately 99% (60 mg/l of RhB solution), of which 18% of RhB adsorption occurred in dark condition. Moreover, outstanding reusability of Chl-Cu/ZnO, for up to six cycles, was found, with more than 80% degradation efficiency.
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