A sustainable innovation for enhanced natural dye extraction and dyeing

The global textile industry is a major contributor to water pollution due to its reliance on toxic synthetic dyes. While natural dyes offer an eco-friendly alternative, conventional heat-based extraction methods degrade heat-sensitive pigments, consume high energy, and yield inconsistent dye particle sizes, leading to uneven coloration. This study aims to develop and investigate a high-efficiency, sustainable system for natural dye extraction and textile dyeing, specifically evaluating a technological approach against traditional methods. Using turmeric as the natural dye source, the extraction process involved four main techniques. The proposed innovation combined freeze-drying, homogenization, and sonication and was compared against the traditional direct boiling method. Findings revealed that the proposed technique drastically reduced the mean particle size to 1252.29 nm compared to the traditional technique (4853.75 nm), ensuring highly uniform dispersion. Furthermore, UV-Vis spectrophotometry demonstrated that proposed technique achieved the highest colour absorbance peak, far surpassing the traditional method. A visual assessment survey confirmed a 100% user preference for cotton fabrics dyed using the proposed technique due to superior brightness and evenness. In conclusion, the integration of freeze-drying, homogenization, and sonication resolves the traditional bottlenecks of natural dyes, significantly improving colour intensity and particle uniformity. This eco-friendly innovation eliminates the need for toxic heavy-metal mordants, minimizes energy consumption, and holds immense commercial potential for sustainable textile coloration towards a zero-carbon footprint.