Newly synthesized by SiO2 surface treated TiO2 nanoparticles (TiO2-SiO2) were prepared, characterized and utilized in functional dyeing as combined reactive dyeing of cotton fabrics. Factors affecting the dyeing and functional properties of the treated fabric, concentration of TiO2-SiO2 and of reactive dye as well as dyeing regime were studied. The chemical and morphological structures of nano-upgraded cotton fabrics were characterized by ATR-FTIR spectroscopy and scanning electron microscopy. UV-blocking ability, coloration and comfortable behaviour of cotton have been evaluated through ultraviolet protection factor, CIE L*a*b* color values and air permeability determinations, respectively. Incorporation of TiO2-SiO2 into the dyeing with reactive dyes brought about an outstanding UV protection functionality of the dyed fabrics even after 15 laundering cycles with a negligible negative impacton color and comfortable properties. Improvement or decrement in the UV protection, comfort, and dyeing properties is governed by the reactants concentrations and the dyeing temperature.
COBISS.SI-ID: 15768854
In the research work presented here, a Plackett-Burman two-level partial factorial design was adopted as a multivariate strategy to determine the optimum UV/H2O2 process conditions for maximizing the treatment efficiency of dye-rich textile effluents. The influence of wastewater parameters, i.e. type and concentration of dye (C Dye), 100-300 mg/L; concentration of NaCl (C NaCl), 2.5-3.5 mg/L; and concentration of urea (C Urea), 5-15 mg/L; and the amount of NaOH (C NaOH), 1-2.4 mL/L; as well as the operational parameters, i.e. intensity of UV irradiation (I UV), 1.2-1.4 kW; the amount of H2O2, 0.7-8.3 mL/L; and treatment time (t), 6-30 min; on the colour and the removal of organic pollutants was investigated. After determining seven variables, laboratory-scale experiments were conducted using two synthetically-prepared wastewaters solutions that were polluted with two structurally different reactive dyes and selected chemicals. The assessment of the UV/H2O2 pilot plant's performance was by monitoring the absorbance and total organic carbon in the treated samples. The obtained results showed that the treatment time and dye concentration had a major impact on the reduction of both reactive dyes. At the same time, the amount of urea and the intensity of UV radiation had a notable influence on the organic pollutant reduction.
COBISS.SI-ID: 16030486
Enzyme treatment technologies in textile processing have become commonly-applied techniques for the modification of fabric-handle appearance, and other surface and mechanical characteristics of fabrics. Most studies have focused on understanding the impact of enzyme treatments on the fabric preparation, dyeing, and finishing processes of woven fabrics, whilst only limited research has been reported regarding any enzymatic effects on the surface and handproperties of knitted fabrics. The aim of this study was to analyze the effects of two different enzymes Trichoderma reesei whole cellulase, and enriched (EGIII) endoglucanase cellulase, at three different enzyme dosages on 100 % cotton interlock knitted fabric. This was in order to evaluate certain surface properties such as pilling, friction. and geometrical roughness. Furthermore, the compression and tactile properties of knitted fabric were also analyzed. The results show that treatment conditions with enzyme Trichoderma reesei whole cellulase had the more pronounced effect on the surface properties compared to the enriched EGIII enzymes.
COBISS.SI-ID: 15913238