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Research on the Bleaching Process of Cotton Linter Pulp with Potassium Peroxymonosulfate Combined with Bleaching Additives
Received:October 08, 2024  
DOI：10.11980/j.issn.0254-508X.2025.03.014
Key Words:refined cotton  bleach  potassium peroxymonosulfate  active species
Fund Project:国家自然科学基金项目（22076098）。
Author NameAffiliationPostcode
JIA Manke College of Biology and Pharmacy， Three Gorges University， Yichang， Hubei Province， 443002
College of Materials and Chemical Engineering， Three Gorges University， Yichang， Hubei Province， 443002 		443002
LIU Qin College of Biology and Pharmacy， Three Gorges University， Yichang， Hubei Province， 443002 443002
ZHOU Ziyun College of Materials and Chemical Engineering， Three Gorges University， Yichang， Hubei Province， 443002 443002
ZHANG Ronghua College of Materials and Chemical Engineering， Three Gorges University， Yichang， Hubei Province， 443002 443002
ZHANG Xin College of Materials and Chemical Engineering， Three Gorges University， Yichang， Hubei Province， 443002 443002
LIU Liming* College of Materials and Chemical Engineering， Three Gorges University， Yichang， Hubei Province， 443002 443002
ZHOU Hangxu Hubei Jinhanjiang Refined Cotton Co.， Ltd.， Jingmen， Hubei Province， 431900 431900
FAN Jintao Hubei Jinhanjiang Refined Cotton Co.， Ltd.， Jingmen， Hubei Province， 431900 431900
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Abstract:In this study， an environmental-friendly and high efficiency cotton short linter pulp bleaching process was developed with potassium peroxymonosulfate （PMS） as the major oxidant. Based on determining the process composition， the process conditions were optimized through single-factor experiments， cellulose with the degree of polymerization above 2 200 and the whiteness reached 83% was successfully obtained. Many techniques were performed to measure the functional groups， crystal forms， and morphology of cotton short-staple pulp before and after bleaching. The results showed that the PMS bleaching process could effectively remove the colored substance on the cellulose with less damage to the chemical and crystal structure and morphology of cellulose. In addition， the signal intensity of superoxide radical （O2·-）， singlet oxygen （1O2）， hydroxyl radical （·OH）， and sulfate radical （SO4·-） were detected increasing after the addition of sodium diphosphate （PA）， sodium triphosphate （PB）， and sodium dodecylbenzene sulfonate （SDBS） as auxiliaries. The quenching of O2·- and 1O2 led the decrease of whiteness decreased by 62.7% and 57.8%， respectively. While the quenching of 1O2 made the polymerization degree kept around 2 742. which was not different from the unbleached cotton linter pulp. These results showed that the radicals were involved in the bleaching process， and O2·- and 1O2 were the main active species affecting the whiteness of cotton linter pulp， and 1O2 had the greastet effect on the polymerization degree of cellulose.
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