Open AccessAqueous extract of broccoli mediated synthesis of CaO nanoparticles and its application in the photocatalytic degradation of bromocrescol green
Author(s) -
Osuntokun Jejenija,
Onwudiwe Damian C.,
Ebenso Eno E.
Publication year - 2018
Publication title -
iet nanobiotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.366
H-Index - 38
eISSN - 1751-875X
pISSN - 1751-8741
DOI - 10.1049/iet-nbt.2017.0277
Subject(s) - thermogravimetric analysis , nanoparticle , aqueous solution , photocatalysis , materials science , crystallinity , nuclear chemistry , selected area diffraction , crystallite , fourier transform infrared spectroscopy , calcination , scherrer equation , anatase , chemical engineering , chemistry , transmission electron microscopy , nanotechnology , catalysis , organic chemistry , metallurgy , engineering , composite material
CaO nanoparticles have been prepared using CaCl 2 and aqueous extract of broccoli as a precursor and reducing agent, respectively. Different volumes of the aqueous broccoli extract were utilised to obtain Ca(OH) 2 and subsequent calcination gave CaO nanoparticles. The synthesised CaO was confirmed by powder X‐ray diffraction (XRD). The morphology was studied using transmittance electron microscopy (TEM), and the surface composition of Ca(OH) 2 was explored using Fourier transform infrared spectroscopy. The major functional groups present in the capping material responsible for the reduction of the metal salt and the surface passivation of Ca(OH) 2 were identified. The XRD pattern revealed cubic phase for all the CaO nanoparticles, and the crystallite size was estimated using Scherrer's equation showed a variation which is dependent on the volume of the extract used. TEM analysis showed different shapes, while the selected area electron diffraction (SAED) results confirmed the crystallinity of the nanoparticles. Thermogravimetric analysis of Ca(OH) 2 showed the decomposition product to be CaO. Sample C3, which has the smallest particle size, was used as a catalyst for the degradation of bromocresol green via photo irradiation with ultraviolet light and the result revealed a degradation efficiency of 60.1%.