Open AccessPhotocatalytic Degradation of Rhodamine B and Malachite Green by Cobalt Sulfide Nanoparticles
Author(s) -
Gunjan Chauhan,
Manjeet Sharma
Publication year - 2022
Publication title -
asian journal of chemistry/asian journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.145
H-Index - 34
eISSN - 0975-427X
pISSN - 0970-7077
DOI - 10.14233/ajchem.2022.23483
Subject(s) - chemistry , cobalt , rhodamine b , nanoparticle , cobalt sulfide , malachite green , nuclear chemistry , brilliant green , photocatalysis , photochemistry , analytical chemistry (journal) , inorganic chemistry , materials science , nanotechnology , organic chemistry , catalysis , adsorption , electrode , electrochemistry
Present study reports the simple and cost effective thermolytic method for the synthesis of cobaltsulphide nanoparticles (CoS NPs). The PXRD spectrum of cobalt sulphide (CdS) nanoparticles exhibitedfour peaks indexed to (100), (101), (102) and (110) crystal planes. The average particle size observedfrom DLS and PXRD was in the range 4.81-12.20 nm. A blue shift in band gap was observed fromUV-visible spectra. The FESEM and TEM studies revealed that cobalt sulfide nanoparticles are ofcubic and rectangle shapes. FTIR spectra of hexadecylamine (HDA) capped CoS NPs exhibited ν(N-H)absorption around 3350-3240 cm–1. The stretching frequency due to ν(Co-S) appeared in the region334-332 cm–1. Proton NMR (1H) spectra of CoS NPs showed signals at nearly same positions as incase of capping agent, suggesting its capping nature. ESI-MS analyses of cobalt sulphide nanoparticlesdisplayed peak at m/z = 124.93 corresponding to the [CoS2]+ ion. Thermogravimetric curves showedsingle step decomposition corresponding to 84.28% weight loss and 15.72% as final residue due tocobalt oxide. The degradation rate of rhodamine B and malachite green dyes after irradiating withsunlight showed 92-94% degradation while irradiated with UV-light of 4.8 eV show much slowerdegradation rate.