Abstract
Nickel nanoparticles were synthesized and used to decolourize dye effluent. C. I. Reactive Blue 21 was taken as a reference dye, and polyvinyl pyrrolidone (PVP) was used as a stabilizer to prevent agglomeration of nanoparticles. Characterization of nanoparticles was done by a laser light scattering particle size analyzer, X-ray diffraction (XRD) analysis and transmission electron microscopy (TEM). Various parameters like pH, dye concentration, nanoparticle concentration, alkali addition, salt addition and duration studied for dye decolourization. To confirm the attachment of degraded products of dye on the nanoparticles, FT-IR analysis was done. About 98 % colour removal with simultaneous reduction in chemical oxygen demand (COD) was achieved.
Highlights
The effluent discharged from textile dyeing mill is a highly concentrated coloured wastewater and consists of a mixture of various dyes
Nanoparticle characterization The structure and morphology of nickel nanoparticles can be seen from Fig. 3
When dispersing agent i.e. polyvinyl pyrrolidone (PVP) was added during synthesis, Ni nanoparticles were well dispersed within the PVP matrix
Summary
The effluent discharged from textile dyeing mill is a highly concentrated coloured wastewater and consists of a mixture of various dyes. These dyes are not dischargeable and have resistance towards oxidative degradation, which makes its decolourization a difficult task They are highly water-soluble, shows resistance to adsorption and non-biodegradable under aerobic conditions resulting in permanent coloured effluent (Mathews et al, 2009). The colour removal of the dye solution was carried out by using chemically synthesized disperse nickel nanoparticles in a non-aqueous solution using polyvinyl pyrrolidone (PVP) as a stabilizer. The various parameters such as time, nanoparticle concentration, initial RB21 dye concentration and pH were studied.
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