Evaluation on La2O3 garlanded ceria heterostructured binary metal oxide nanoplates for UV/ visible light induced removal of organic dye from urban wastewater

C. Maria Magdalane; K. Kaviyarasu; N. Matinise; N. Mayedwa; N. Mongwaketsi; Douglas Letsholathebe; G.T. Mola; Naif AbdullahAl-Dhabi; Mariadhas Valan Arasu; M. Henini; J. Kennedy; M. Maaza; B. Jeyaraj

South African Journal of Chemical Engineering (Dec 2018)

Evaluation on La2O3 garlanded ceria heterostructured binary metal oxide nanoplates for UV/ visible light induced removal of organic dye from urban wastewater

C. Maria Magdalane,
K. Kaviyarasu,
N. Matinise,
N. Mayedwa,
N. Mongwaketsi,
Douglas Letsholathebe,
G.T. Mola,
Naif AbdullahAl-Dhabi,
Mariadhas Valan Arasu,
M. Henini,
J. Kennedy,
M. Maaza,
B. Jeyaraj

Affiliations

C. Maria Magdalane: Department of Chemistry, St. Xavier's College (Autonomous), Tirunelveli, 627002, India; LIFE, Department of Chemistry, Loyola College (Autonomous), Chennai, 600034, India
K. Kaviyarasu: UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P O Box 392, Pretoria, South Africa; Nanosciences African Network (NANOAFNET), Materials Research Department (MRD), iThemba LABS-National Research Foundation (NRF), 1 Old Faure Road, 7129, P O Box 722, Somerset West, Western Cape Province, South Africa; Corresponding author. UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P O Box 392, Pretoria, South Africa.
N. Matinise: UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P O Box 392, Pretoria, South Africa; Nanosciences African Network (NANOAFNET), Materials Research Department (MRD), iThemba LABS-National Research Foundation (NRF), 1 Old Faure Road, 7129, P O Box 722, Somerset West, Western Cape Province, South Africa
N. Mayedwa: UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P O Box 392, Pretoria, South Africa; Nanosciences African Network (NANOAFNET), Materials Research Department (MRD), iThemba LABS-National Research Foundation (NRF), 1 Old Faure Road, 7129, P O Box 722, Somerset West, Western Cape Province, South Africa
N. Mongwaketsi: UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P O Box 392, Pretoria, South Africa; Nanosciences African Network (NANOAFNET), Materials Research Department (MRD), iThemba LABS-National Research Foundation (NRF), 1 Old Faure Road, 7129, P O Box 722, Somerset West, Western Cape Province, South Africa
Douglas Letsholathebe: Department of Physics, University of Botswana, Private Bag 0022, Gaborone, Botswana
G.T. Mola: School of Chemistry Physics, University of KwaZulu-Natal, Pietermaritzburg Campus, Private Bag X01, Scottsville, 3209, South Africa
Naif AbdullahAl-Dhabi: Addiriyah Chair for Environmental Studies, Department of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
Mariadhas Valan Arasu: Addiriyah Chair for Environmental Studies, Department of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
M. Henini: UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P O Box 392, Pretoria, South Africa; School of Physics and Astronomy, Nottingham Nanotechnology and Nanoscience Centre, University of Nottingham, Nottingham, NG7 2RD, United Kingdom
J. Kennedy: UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P O Box 392, Pretoria, South Africa; National Isotope Centre, GNS Science, Lower Hutt, 5010, New Zealand
M. Maaza: UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P O Box 392, Pretoria, South Africa; Nanosciences African Network (NANOAFNET), Materials Research Department (MRD), iThemba LABS-National Research Foundation (NRF), 1 Old Faure Road, 7129, P O Box 722, Somerset West, Western Cape Province, South Africa
B. Jeyaraj: LIFE, Department of Chemistry, Loyola College (Autonomous), Chennai, 600034, India

Journal volume & issue: Vol. 26
pp. 49 – 60

Abstract

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A low energy bandgap between Ce3+ and Ce4+ states in cerium oxides, high oxygen mobility and high oxygen storage capacity are the properties that qualify them to be the most widely used heterogeneous catalysts. This present work is an account of studies that were carried out on the synthesis and catalytic properties of pure CeO2, CeO2/La2O3 based binary metal oxide nanostructures prepared by the hydrothermal method. Our results revealed that the synthesis temperature and pressure during hydrothermal reactions played a critical role in controlling the shape, size, oxygen vacancy, and low temperature reducibility in CeO2 based nanostructures. In addition, OH− ion concentration was found to play an important role in engineering the lattice constants and oxygen vacancy defects. The present report demonstrated that the hydrothermal synthesis is a facile one step approach for the preparation of compositionally homogeneous cerium based binary metal oxide nanostructures, in which CeO2/La2O3 mixed oxides have a superior low-temperature oxygen release capability compared to pure CeO2. We have also demonstrated that the nanomaterials are proved to have higher catalytic performance at low temperatures as compared to pure ceria nanoparticles. Keywords: CeO2:La2O3, Heterogeneous catalysts, Electron microscopy, Photocatalytic activity, RhB dye

Published in South African Journal of Chemical Engineering

ISSN: 1026-9185 (Print)
Publisher: Elsevier
Country of publisher: South Africa
LCC subjects: Technology: Chemical technology: Chemical engineering
Website: https://www.journals.elsevier.com/south-african-journal-of-chemical-engineering/

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