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Updated: May 14, 2026

Extraction of Ramie Fiber in Alkali Hydrogen Peroxide System Supported by Controlled-release Alkali Source

Extraction of Ramie Fiber in Alkali Hydrogen Peroxide System Supported by Controlled-release Alkali Source

Published on: February 6, 2018

One-step bleaching process for cotton fabrics using activated hydrogen peroxide.

E S Abdel-Halim¹, Salem S Al-Deyab

¹Petrochemical Research Chair, Chemistry Department, College of Science, King Saud University, Riyadh 11451, P.O. Box 2455, Saudi Arabia. essamya@yahoo.com

Carbohydrate Polymers

|February 13, 2013

Summary

This study presents an economical cotton fabric bleaching method using hydrogen peroxide activated by thiourea. Optimal conditions achieve excellent whiteness and strength in one hour, offering an efficient textile processing solution.

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Area of Science:

Textile Chemistry
Green Chemistry
Materials Science

Background:

Traditional cotton bleaching often involves harsh chemicals and high energy consumption.
Developing eco-friendly and cost-effective bleaching agents is crucial for sustainable textile manufacturing.

Purpose of the Study:

To optimize a novel bleaching system for cotton fabric using hydrogen peroxide activated by thiourea.
To determine the ideal concentrations of hydrogen peroxide and thiourea, temperature, and liquor ratio for effective bleaching.

Main Methods:

Cotton fabric samples were treated using varying concentrations of hydrogen peroxide and thiourea.
Bleaching experiments were conducted at different temperatures (e.g., 90 °C) and material-to-liquor ratios (e.g., 1:20).
Whiteness index and tensile strength were measured to evaluate the bleaching efficiency and fabric integrity.

Main Results:

Optimal bleaching was achieved at 90 °C with 6 g/l hydrogen peroxide, 1.5 g/l thiourea, and 1 g/l non-ionic wetting agent.
These conditions resulted in a satisfactory whiteness index and reasonable tensile strength within a 1-hour duration.
Deviations in thiourea concentration led to prolonged bleaching times or unsatisfactory whiteness due to premature oxidation.

Conclusions:

The hydrogen peroxide-thiourea system provides an efficient and economical method for cotton fabric bleaching.
Optimized conditions balance whiteness, fabric strength, and processing time, aligning with green chemistry principles.
This activated bleaching system offers a viable alternative to conventional methods in the textile industry.