BOD5 removal from tannery wastewater over ZnO-ZnFe2O4 composite photocatalyst supported on activated carbon | Zendy

Abdulrahman Mohammed | Zendy

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BOD5 removal from tannery wastewater over ZnO-ZnFe2O4 composite photocatalyst supported on activated carbon

Author(s) -

Abdulrahman Mohammed

Publication year - 2013

Publication title -

journal of chemical engineering and materials science

Language(s) - English

Resource type - Journals

ISSN - 2141-6605

DOI - 10.5897/jcems2013.0165

Subject(s) - photocatalysis , activated carbon , wastewater , adsorption , materials science , effluent , nuclear chemistry , waste management , chemistry , catalysis , organic chemistry , engineering

Tannery wastewater with high biological oxygen demand (BOD5) was treated with ZnO-ZnFe2O4composite photocatalyst supported on activated carbon under visible light irradiation. Only 9% of BOD5 in the raw effluent were removed via adsorption on the surface of the photocatalyst in the dark for two hours. Photocatalysis with ZnO-ZnFe2O4 composite photocatalyst on activated carbon support removed 90% of BOD5 in two hours. For all the photocatalysis, complete BOD5removal of the wastewater sample could not be achieved. The photocatalytic effiency was found to increase with increase in the power of the light sources employed. The kinetics of decrease of the value of BOD5 fitted to the pseudo first order kinetic model (R2 = 0.9601). The derived value of the apparent rate constant for the photocatalytic decrease of the value of BOD5 was 0.049 min-1. Key words: Photocatalyst, BOD5, ZnO-ZnFe2O4, tannery, wastewater.

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