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Photocatalytic Degradation of Rhodamine B and
Malachite Green by Cobalt Sulfide Nanoparticles

Present study reports the simple and cost effective thermolytic method for the synthesis of cobalt
sulphide nanoparticles (CoS NPs). The PXRD spectrum of cobalt sulphide (CdS) nanoparticles exhibited
four peaks indexed to (100), (101), (102) and (110) crystal planes. The average particle size observed
from DLS and PXRD was in the range 4.81-12.20 nm. A blue shift in band gap was observed from
UV-visible spectra. The FESEM and TEM studies revealed that cobalt sulfide nanoparticles are of
cubic 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 region
334-332 cm–1. Proton NMR (1H) spectra of CoS NPs showed signals at nearly same positions as in
case of capping agent, suggesting its capping nature. ESI-MS analyses of cobalt sulphide nanoparticles
displayed peak at m/z = 124.93 corresponding to the [CoS2]+ ion. Thermogravimetric curves showed
single step decomposition corresponding to 84.28% weight loss and 15.72% as final residue due to
cobalt oxide. The degradation rate of rhodamine B and malachite green dyes after irradiating with
sunlight showed 92-94% degradation while irradiated with UV-light of 4.8 eV show much slower
degradation rate.