Verma, MonaRaveena2023-03-042023-03-042023-09https://krishikosh.egranth.ac.in/handle/1/5810194756Textile dyeing and printing industry is one of the most polluting sectors from an ecological point of view. There is need to approach new strategies, methods, material for dyeing treatment of cotton fabric with natural dyes using environment benign route. To achieve the objectives of the study, different sizes of biopolymer chitosan nano-particles for onion skin dye, were tried and one was selected on the basis of colour properties of dyed fabrics. Standardization of chitosan nano-particles treatment process for onion skin dye was done on the basis of colour properties i.e., dye absorption, colour strength and wash fastness for different concentrations and conditions. It was found that the chitosan nano-particle treated onion skin dyed fabric showed higher dye absorption (69.36%), colour strength (18.54), wash fastness rating than alum treated dyed fabric (66.21%, 14.21 K/S respectively. The chitosan nano-particle treated onion skin dyed fabric showed higher crease recovery (90.5 degree) than alum treated (87.3 degree) dyed fabric. The chitosan nano-particle treated onion skin dyed fabric showed increased bacterial resistance against E. coli (97.17 %) and S. aureus (98.30%) bacteria than alum treated dyed fabric (87.00 % and 84.74 %) respectively. The chitosan nano-particle treated onion skin fabric showed the higher UPF value (85.91) than with alum treated dyed cotton fabric (71.94). Chitosan nano-particle treated onion skin dyed fabrics demonstrated better of antibacterial and ultra-violet protection property than alum treated and dyed fabrics. Thus, it was concluded that chitosan treatment enhanced colour properties without using any harsh chemicals and is capable enough to replace the use of metallic salts in the dyeing of natural dye. The chitosan nano-particle treatment along with onion skin dye imparted the multi-functionality to the cotton fabric in terms of excellent UV protection, bacterial resistance and crease-resistant properties in effective manner with environmental benign way to curtail the pollution burden on environment.EnglishThesis