Journal
GREEN CHEMISTRY LETTERS AND REVIEWS
Volume 11, Issue 2, Pages 166-175Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/17518253.2018.1447604
Keywords
NiO nanocrystals; Aspalathus linearis; photocatalytic application; methylene blue
Funding
- National Research Foundation of South Africa (NRF)
- iThemba LABS-National Research Foundation
- UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology
- College of Graduate Studies
- University of South Africa
- Centre for Science and Technology of the Non-Aligned and Other Developing Countries (NAM S&T Centre), New Delhi [NAM-05/74/2015]
- Centre for Nano Science and Nanotechnology, K.S. Rangasamy College of Technology, Tiruchengode, Tamil Nadu, India
- Abdus Salam ICTP via the Nanoscience African network (NANOAFNET)
- African Laser Center
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NiO is one of the most important candidates for semiconductors metal oxide nanocrystals by the arrangement of photocatalytic application. However, the photocatalytic performance of biosynthesized nanocrystals using Aspalathus linearis (Burm.f.) R.Dahlgren has not been investigated yet. In this contribution, we synthesize -Ni(OH)(2) using an A. linearis. A heat treatment of the -Ni(OH)(2) is carried out at 300-400 degrees C for 2h at normal air yields. Furthermore, we have characterized the structural, optical and photocatalytic activity of the samples. The optical results indicate that biosynthesized nanocrystals exhibit UV-visible light absorption and a narrow range distribution of intense green light (518.95nm) emission, which decreases significantly as annealing temperature increases. The bandgap energies of the sample annealed at 300-400 degrees C shift to lower photon energy, compared to bulk NiO (approximate to 4eV). Moreover, the photocatalytic experimental results reveal that NiO nanocrystals enable color switching of methylene blue. [GRAPHICS] .
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