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Amir Azizi

Amir Azizi

Academic rank: Assistant Professor
ORCID: https://orcid.org/0000-0003-2741-6797
Education: PhD.
ScopusId: 56318653900
Faculty: Science
Address: Arak University
Phone:

Research

Title
SYNERGISTIC ELIMINATION OF Cr(VI) AND Ni(II) IONS WITH TRACE AMOUNTS OF TITANIA PHOTOCATALYST NANOPARTICLES
Type
JournalPaper
Keywords
divalent nickel, energy consumption, hexavalent chromium, nano titania, simultaneous reduction
Year
2014
Journal Environmental Engineering and Management Journal
DOI
Researchers javad Saien ، Amir Azizi

Abstract

The separate and simultaneous photocatalytic reduction of poisonous Cr(VI) and Ni(II) ions were examined with trace amounts of commercial titania nanoparticles (up to 50 mg/L). A direct irradiation photo-reactor, equipped with ultrasonic source was employed. The effects of four operating parameters, catalyst dosage, pH, temperature and metal ions ratio were investigated. The simultaneous operations, in the ternary Cr(VI)/Ni(II)/TiO2 system, show a synergism in reduction efficiency compared to just individual ions treatments. The influence of the hole scavengers to intensify the process was appeared in the order of ethylene glycol > formic acid > citric acid. Under the best found conditions of [TiO2]= 40 mg/L, pH= 7.5, T= 35 °C, ratio of [Cr(VI)]0/[Ni(II)]0= 0.5 and 100 mg/L ethylene glycol, 58.9% reduction in Cr(VI) and 66.0% in Ni(II) ions were achieved after 110 min irradiation. The perfect reaction kinetic was determined for individual ions. Accordingly, the energy consumption was evaluated. This parameter, together with the significant achieved efficiency, confirms the high performance of the used process in comparison with a similar simultaneous reduction work.