article · International Journal of Sustainable Engineering
This study demonstrates an environmentally friendly process for colouring and finishing cotton fabrics using an extract derived from Justicia schimperiana leaves. The colourant was obtained through solvent extraction and applied to cotton using an exhaust dyeing method. To fix the colour, copper sulphate, ferrous sulphate, and alum were introduced via simultaneous mordanting. By applying a Box Behnken design to optimise process conditions, the researchers assessed the influence of shade percentage, temperature, and duration on colour strength. The highest colour strength of 3.28 was attained using a 50 percent shade on weight of fabric at 72 degrees Celsius for 45 minutes. Beyond coloration, the treated cotton fabrics were tested against common pathogens, including Staphylococcus aureus and Escherichia coli, demonstrating desirable antibacterial properties alongside measured washing and rubbing fastness.
Synthetic textile dyes can pose environmental and health hazards. Exploring natural colourants from botanical sources like Justicia schimperiana provides an alternative method to dye fabrics safely. The added benefit of antibacterial protection against common bacteria offers a route toward creating multi-functional, more sustainable textile products with a reduced environmental footprint.
This research could interest textile manufacturers seeking natural, non-toxic alternatives to synthetic dyes that also impart functional antibacterial properties. It demonstrates applied laboratory-scale feasibility for cotton fabrics using standard exhaust dyeing and mordanting processes. The technology appears to be at an early, applied testing stage, requiring further scale-up studies and commercial validation before practical industry adoption.
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The use of non-toxic and eco-friendly natural dyes on textiles has received much attention due to the increased environmental awareness to avoid some hazardous synthetic dyes. In the present study, an eco-friendly approach was developed to impart colour and antibacterial properties to cotton fabrics dyed with Justicia schimperiana leaf extract as a non-toxic natural colourant. The solvent method of extraction and exhaust dyeing method was used for this study. Copper sulphate, ferrous sulphate, and alum were applied in a simultaneous -mordanting process as a mordanting agent. The effects of shade percentage, dyeing temperature, and dyeing time on the obtained colour strength of the fabrics were investigated. Optimisation of dyeing conditions was carried out using Box Behnken design of expert software. An optimum level of 3. 28 colour strength (K/S) was observed in the sample treated with a shade percentage of 50 (% o.w.f), 72 °C dyeing temperature, and 45 minutes of dyeing time. Antibacterial properties of treated fabrics were evaluated against common pathogenic bacteria, Staphylococcus aureus (Gram-positive) and Escherichia coli (Gram-negative). The results indicated the treated fabrics possessed desirable antibacterial properties. The washing and rubbing fastness of the dyed fabrics were also reported.
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DOI: 10.1080/19397038.2023.2301702
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