Photocatalytic Removal of Cyanide from Cassava Processing Wastewater with Simultaneous Generation of H2 and C2H4 Using Ni-modified TiO2

The present work reports the photocatalytic treatment of the wastewater from cassava processing in an inert atmosphere aiming to degrade cyanide species with the simultaneous generation of sustainable fuels. Nickel-modified TiO 2 was used as a photocatalyst with a wide range of Ni content, varying f...

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Bibliographic Details
Published in:Waste and biomass valorization 2023-11, Vol.14 (11), p.3869-3880
Main Authors: Santos, Klebson S., Lopes, Paula A. L., Mascarenhas, Artur José Santos, Silva, Luciana Almeida
Format: Article
Language:English
Subjects:
Anatase
Atmosphere
Cassava
Catalytic activity
Crystal lattices
Cyanide process
Cyanides
Engineering
Environment
Environmental Engineering/Biotechnology
Heat treatment
Heat treatments
Industrial Pollution Prevention
Inert atmospheres
Mitigation
Nickel
Original Paper
Oxidizing atmospheres
Photocatalysis
Photocatalysts
Renewable and Green Energy
Titanium dioxide
Waste Management/Waste Technology
Wastewater treatment
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Summary:The present work reports the photocatalytic treatment of the wastewater from cassava processing in an inert atmosphere aiming to degrade cyanide species with the simultaneous generation of sustainable fuels. Nickel-modified TiO 2 was used as a photocatalyst with a wide range of Ni content, varying from 0.5 to 4%. The materials were also treated under reducing and oxidizing atmospheres to improve the photocatalytic activity. XRD analysis revealed anatase as the main phase in all samples with the rutile phase present in some of them and the exchange of some Ti atoms by Ni atoms in the crystal lattice. Although no segregated phase associated with Ni has been identified, the presence of nickel dramatically changes the bandgap energies of the photocatalysts, from 3.2 eV for pure TiO 2 to 2.3 for Ni(4.0%)-TiO 2 . Both Ni content and heat treatment influenced the photocatalytic activity. The photocatalyst with the highest Ni content and thermally treated in a reducing atmosphere followed by an oxidizing atmosphere, called O-Ni(4%)-TiO 2 , was the most active photocatalyst, with mitigation of 98% of total cyanide and simultaneous generation of H 2 and C 2 H 4 . Graphical Abstract
ISSN:1877-2641
1877-265X
DOI:10.1007/s12649-023-02098-4