Environmental method for preparation of higher color strength dyeing cotton fabrics with colored nanosilica pigment
2021
Zhang, Jinping | Li, Yonghe | Du, Peibo | Guo, Zhiguang | Cai, Zaisheng | Ge, Fengyan
Colored wastewater discharge into the water system would pose a severe threat to human health and aquatic life. It is critical to enhance dye utilization and reduce dye discharge in the textile industry. In this work, a novel colored silica nanosphere was designed as pigment to dye cotton fabrics and could be recycled in the dyeing process. The worm-like hydrophilic porous silica (WHMS) nanospheres possess a large specific surface area of 968.61 m²/g, an average size of 300 nm, and strong electronegativity. The WHMS-dye nanosphere was fabricated through the adsorption of rhodamine B (RB) and methylene blue (MB) onto WHMS nanospheres. The adsorption capacities of WHMS nanospheres towards RB and MB were above 500 mg/g. It demonstrated that the prepared WHMS-dye nanospheres possessed good stability and coloration performance on the cotton fabrics, originating from the enrichment of dyes on the WHMS nanospheres. The color strength of colored nanospheres-dyed cotton fabrics is deeper compared with the pure dye. Moreover, the dyed cotton fabrics show satisfactory color fastness and hand feel. The colored silica nanospheres could be reused for the next dyeing process to reduce dyes discharge. This work shows that WHMS-dye nanospheres may be used as an environmentally sound pigment for dyeing cotton fabrics to avoid a large amount of dyes discharge.
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