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Green Chemistry Letters and Reviews Volume 11, 2018 - Issue 2
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RESEARCH LETTERS

Structural, optical and photocatalytic applications of biosynthesized NiO nanocrystals

A. DialloUNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, College of Graduate Studies, University of South Africa, Pretoria, South Africa;Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, Somerset West, South Africa;Department of Physics and Chemistry, Faculty of Sciences and Technologies of Formation and Education, University Cheikh Anta Diop, Dakar, Senegal;Centre for Nano Science and Nanotechnology, K.S. Rangasamy College of Technology, Tiruchengode, IndiaCorrespondence[email protected]
ORCID Iconhttp://orcid.org/0000-0002-4032-0477View further author information
ORCID Icon,
K. KaviyarasuUNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, College of Graduate Studies, University of South Africa, Pretoria, South Africa;Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, Somerset West, South AfricaView further author information
,
S. NdiayeUNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, College of Graduate Studies, University of South Africa, Pretoria, South Africa;Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, Somerset West, South Africa;Department of Physics, Faculty of Science and Technology, University Cheikh Anta Diop, Dakar, SenegalView further author information
,
B. M. MothudiUNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, College of Graduate Studies, University of South Africa, Pretoria, South Africa;Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, Somerset West, South AfricaView further author information
,
A. IshaqUNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, College of Graduate Studies, University of South Africa, Pretoria, South Africa;Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, Somerset West, South Africa;National Center for Physics, Quaid-i-Azam University, Islamabad, PakistanView further author information
,
V. RajendranUNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, College of Graduate Studies, University of South Africa, Pretoria, South Africa;Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, Somerset West, South Africa;Centre for Nano Science and Nanotechnology, K.S. Rangasamy College of Technology, Tiruchengode, IndiaORCID Iconhttp://orcid.org/0000-0001-9471-5311View further author information
ORCID Icon &
M. MaazaUNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, College of Graduate Studies, University of South Africa, Pretoria, South Africa;Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, Somerset West, South AfricaView further author information
 show all
Pages 166-175 | Received 17 Dec 2017, Accepted 28 Feb 2018, Published online: 14 Mar 2018

Figures & data

Figure 1. A schematic diagram of a formation of NiO nanocrystals using A. linearis.

Figure 1. A schematic diagram of a formation of NiO nanocrystals using A. linearis.

Figure 2. FTIR spectra of dried products (spectrum (a)) and the sample thermally treated at 300°C (spectrum (b)).

Figure 2. FTIR spectra of dried products (spectrum (a)) and the sample thermally treated at 300°C (spectrum (b)).

Figure 3. RT X-ray diffraction of the samples: (a) sample annealed at 200°C, and (b) samples annealed at 300°C and 400°C.

Figure 3. RT X-ray diffraction of the samples: (a) sample annealed at 200°C, and (b) samples annealed at 300°C and 400°C.

Figure 4. TEM, HRTEM, SAED and size distribution of biosynthesized NiO nanocrystals.

Figure 4. TEM, HRTEM, SAED and size distribution of biosynthesized NiO nanocrystals.

Figure 5. (a) UV–vis absorption spectrum of biosynthesized NiO nanocrystals, and (b) plot (α hυ)2 vs. hυ for the biosynthesized NiO nanocrystals.

Figure 5. (a) UV–vis absorption spectrum of biosynthesized NiO nanocrystals, and (b) plot (α hυ)2 vs. hυ for the biosynthesized NiO nanocrystals.

Figure 6. (a) PL spectra of biosynthesized NiO nanocrystals in the wavelength range of 258–800 nm, and (b) PL spectrum of B_NiO samples in the range of ∼258–600 nm (I < 7 cps).

Figure 6. (a) PL spectra of biosynthesized NiO nanocrystals in the wavelength range of 258–800 nm, and (b) PL spectrum of B_NiO samples in the range of ∼258–600 nm (I < 7 cps).

Figure 7. Light responses of biosynthesized NiO nanocrystals/water/MB system. (a) UV–visible spectra displaying the bleaching process of MB under UV radiation without biosynthesized NiO nanocrystals. (b) The plots of the ratio of MB in biosynthesized NiO nanocrystals/water/MB system vs. irradiation time. (c–f) UV–visible spectra displaying the bleaching/ recoloration process of biosynthesized NiO nanocrystals/water/MB systems.

Figure 7. Light responses of biosynthesized NiO nanocrystals/water/MB system. (a) UV–visible spectra displaying the bleaching process of MB under UV radiation without biosynthesized NiO nanocrystals. (b) The plots of the ratio of MB in biosynthesized NiO nanocrystals/water/MB system vs. irradiation time. (c–f) UV–visible spectra displaying the bleaching/ recoloration process of biosynthesized NiO nanocrystals/water/MB systems.

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