Extracellular polymeric substances of a marine bacterium mediated
synthesis of CdS nanoparticles for removal of cadmium from aqueous solution. Prof.
Surajit Das, Ritu Raj, Kalpana Dalei and Jaya Chakraborty, Department of Life Sciences
This study demonstrates an efficient biosynthesis method to prepare CdS nanoparticles
(NPs) using EPS extracted from a marine bacterium Pseudomonas aeruginosa
Spherical CdS NPs of 20-40 nm diameter were synthesized with high crystallinity
confirmed by XRD, FESEM and TEM analysis. The ATR-FTIR peaks within 2300 to 2600
cm-1 range showed a prominent shift in sulphydryl group (-SH). The cadmium removal
efficiency by CdS NPs incorporated functionalized EPS (88.66 %) was higher than
functionalized EPS (80.81%) and pristine EPS (61.88%) after 48 h of incubation.
The experimental data of adsorption thermodynamics and kinetics of Cd by NPs incorporated
functionalized EPS was fitted in Langmuir isotherm model. More in J. Colloid Interface
Sci., 462: 166-175 (2016)
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