Mahmood Ul Hasan

Bio: Mahmood Ul Hasan is an academic researcher. The author has contributed to research in topics: Mordant & Dyeing. The author has co-authored 1 publications.

Sustainable application of Cassia obovata-based chrysophanic acid as potential source of yellow natural colorant for textile dyeing.

Abstract: In the current pandemic scenario, sustainable green products particularly antiviral, antioxidant, and antibacterial in nature are gaining worldwide fame in almost every walk of life. Cassia obovata (C. obovata) has been valorized as a source of yellow natural dye for nylon dyeing. For the isolation of dye extracts and for surface tuning, nylon fabrics were treated with microwave rays up to 10 min. For getting new shades with good to excellent fastness characteristics, sustainable bio-mordants in comparison with chemical mordants have been used at 60 °C, 70 °C, and 80°C. It has been found that for getting effective colorant yield, acidic extract should be exposed to MW ray treatment up to 6 min, and for getting improved fastness rating, bio-mordants have given excellent color characteristics. Statistical optimization of dyeing variable shows that application of 40 mL of C. obovata acidic extract of RE of 6 pH containing 3 g/100 mL of salt when employed at 55 °C for 45 min has given excellent results onto irradiated nylon fabric (RNF). It is inferred that Cassia obovata has an excellent potential for coloration of surface-modified fabrics, where the application of low amount of bio-mordants under statistical optimized conditions has made process more ecological, economical, and sustainable.

Impact of MW rays on extraction and application of Ficus religiosa bark based natural colourant for cotton dyeing

Abstract: The present study aims to extract a natural brown colourant from Ficus religiosa for cotton dyeing using the microwave radiation process. The colourant was isolated in aqueous and acidic media before and after microwave treatment (MW) for up to 6 min. The dye variables have been optimised for the development of new shades with good fastness characteristics, 1–5 g/100 mL of sustainable chemical and bio-mordants have been used. It has been found that irradiated aqueous extract (RE) containing 3 g/100 mL of salt at 55°C for 45 min has given high colour yield onto cotton fabric (RS) after microwave treatment for 4 min. The utilization of 2% of Al, 2% of Fe, 3% of tannic acid (T.A.) as pre chemical mordant whereas 4% of Al, 5% of Fe, 2% of tannic acid as post chemical mordant has given good colour characteristics. In comparison 3% of acacia and 4% pomegranate while 4% of Acacia and 2% of pomegranate extracts as post-bio-mordant have given excellent colour characteristics. It is concluded that MW treatment has an excellent sustainable efficacy to isolate colourant from Ficus Religiosa bark powder for cotton dyeing, whereas the inclusion of bio-mordants has made the process more sustainable and environmental friendly.

Innovative isolation of colorant from Butea Monosperma for surface-modified silk dyeing

Abstract: Recently, there has been a surge of interest in adopting natural dyes to avoid the environmental difficulties connected with the synthetic coloring compounds. This research focuses on extracting natural dyes from Butea Monosperma plants and on developing sustainable dyeing methods for silk fabric. Natural colorants were extracted using an aqueous and acidic extraction procedure, and the silk fabric was dyed with the extracts using mordanting with a variety of metal and bio mordants. The treatment of fabric and extracts were carried out using microwave irradiation. It was found that after irradiation up to 3 min, the acidic extract shown maximum color strength onto fabric. It was also observed that the acacia and pine-nut hull at 80 °C and before dyeing pomegranate extract at 80 °C and after dyeing of silk fabric at 40 °C using bio-mordants were higher color strength than metallic mordant. For comparative analysis Al salt at 40 °C, Iron salt at 60 °C and tannic acid (T.A.) at 80 °C were provided acceptable results. The color fastness characteristics were also found good to excellent. The bio-mordants not only provide the higher color strength and fastness properties, it was also an environmental friendly approaches. Scanning electron microscopy (SEM) images and Fourier transform infrared spectroscopy (FT-IR) analyses revealed the difference between irradiated and un-irradiated silk fabric. Therefore, it is recommended that MW rays and bio-mordants be used in the natural dyeing of silk fabric because of their deformability and non-toxicity, as well as their high color fastness and color strength properties.

Sustainable Extraction of Colourant from Harmal Seeds (Peganum harmala) for Dyeing of Bio-Mordanted Wool Fabric

Abstract: The recent pandemic scenario has caused demand for green products that have medicinal aspects, as well as greener approaches for global health. Natural dye from plants, particularly from harmal seeds, is an excellent alternative to carcinogenic yellow synthetic dyes. The current study has been conducted to isolate natural colorants from harmal seeds in methanolic medium through Gamma-Assisted Extraction (GAE). The dyeing variables that are necessary for shade development before and after mordanting were selected. It has been found that 6 kGy is the optimal absorbed dose for extraction of colorant from 6 g of powder to isolate the colorant in the methanolic medium through the Gamma-irradiated extraction mode (GAE). To get excellent results, 30 mL of methanolic extract containing 6 g/100 mL of Glauber salt was sued for dyeing of irradiated wool at 45 °C for 65 min. For improving the color strength and acceptable rating of fastness, 9% of henna, 3% of acacia, 10% of turmeric, and 7% of pomegranate extracts as pre-bio-mordants as well as 7% of acacia, 3% of pomegranate, 9% of henna, and 10% of turmeric extracts as post-mordants have given high results compared to when chemical mordants have been used. It was concluded that Gamma-ray treatment has excellent color strength in the dyeing of bio-mordanted wool using harmal seed extracts under mild conditions, and has good fastness ratings after using chemical and bio-mordanting methods as well.