Formation of pH-responsive cotton by the adsorption of methyl orange dye

Kert, Mateja (author), Skoko, Jasna (author)

The interest in pH-sensitive textile sensors is growing in the global market. Due to their low-cost production, mechanical stability, flexibility, air-permeability, washability, and reusability, they are more suitable than electronic sensor systems. The research tailored the pH-sensitive textile by applying the pH indicator methyl orange to the cotton fabric during conventional dyeing. Adsorption of methyl orange dye to cotton fabric is hindered due to electrostatic repulsive forces between dye anions and negatively charged cotton fibre. To overcome this problem, chemical modification of cotton fabric using a commercial product was performed. The pH sensitivity of the dyed fabric was spectrophotometrically evaluated. In addition, the colour fastness of dyed cotton fabric to washing, light, hot pressing and rubbing was investigated according to valid SIST EN ISO standards. The research results show that the pH-responsive cotton fabric was successfully developed. The chemical modification of cotton fabric is crucial for the increased adsorption of methyl orange dye. The halochromic effect was not only perceived spectrophotometrically but also with the naked eye. The developed halochromic cotton fabric showed poor colour fastness to light and good colour fastness to hot pressing and rubbing, while no significant improvement in colour fastness to washing was observed, even though the fabric was after-treated with a cationic fixing agent. Higher adsorption of the methyl orange dye to the cotton fabric during the dyeing process leads to less wastewater pollution after dyeing with unfixed dye and, thus, a reduction in wastewater treatment costs.

• Language: English
• Keywords: pH sensitivity, methyl orange, conventional dyeing, cotton, colour fastness
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: NTF - Faculty of Natural Sciences and Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2023
• Number of pages: 15 str.
• Numbering: Vol. 15, iss. 7, art. 1783
• PID: 20.500.12556/RUL-154130
• UDC: 677
• ISSN on article: 2073-4360
• DOI: 10.3390/polym15071783
• COBISS.SI-ID: 150732291
• Publication date in RUL: 26.01.2024

KERT, Mateja and SKOKO, Jasna, 2023, Formation of pH-responsive cotton by the adsorption of methyl orange dye. Polymers [online]. 2023. Vol. 15, no. 7,  1783. [Accessed 31 March 2025]. DOI 10.3390/polym15071783. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=154130

Record is a part of a journal

• Title: Polymers
• Shortened title: Polymers
• Publisher: MDPI
• ISSN: 2073-4360
• COBISS.SI-ID: 517951257

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: pH odzivnost, metiloranž, konvencionalno barvanje, bombaž, barvne obstojnosti

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0213
• Name: Tekstilije in ekologija