Valorization of Sulfonated Kraft Lignin as a Natural Dye for the Sustainable Dyeing of Wool Fabrics: Effect of Peroxide Oxidation
Valorization of Sulfonated Kraft Lignin as a Natural Dye for the Sustainable Dyeing of Wool Fabrics: Effect of Peroxide Oxidation
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DOI：
10.1021/acssuschemeng.3c04267
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发表时间：
2023-09
期刊：
影响因子：
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通讯作者：
Mohammad Mahbubul Hassan
中科院分区：
文献类型：
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作者：
Mohammad Mahbubul Hassan
木质素是一种丰富而复杂的生物聚合物，具有固有的颜色，但用途很少。它有可能取代合成酸性染料，用于将羊毛纤维染成棕色，因为传统的酸性染料染色会产生有毒废水，需要昂贵的处理。本文研究了磺化硫酸盐木质素作为天然染料单独用于羊毛织物染色和过氧化氢(H2 O2)染色的价态。用反射光谱仪和漫反射光谱仪对染色后的织物进行了表征，分别评价了织物的产色率和防紫外线性能。染色织物具有较好的得色率和令人满意的耐水洗色牢度(3/4级)，经双氧水氧化处理后可达到4级。扫描电子显微镜照片显示，单独用木质素染色时，纤维表面有木质素颗粒沉积，而过氧化氢染色时，纤维表面看不到木质素沉积，染色后织物的色强提高了近一倍。紫外光透过织物的透过率分别从311 nm和365 nm的6.73%和13.23%降至2.19%和5.23%。染色织物的ATR-FTIR光谱表明，织物对木质素磺酸盐的吸收增加，这表明过氧化氢将木质素解聚为更小的大分子，有利于吸收到羊毛纤维中。木质素磺酸盐可能是一种廉价和可持续的替代有害合成染料的方法，用于在羊毛织物上产生棕色色调。
: Lignin is an abundant and complex biopolymer with inherent color but has only a few applications. It has the potential to replace synthetic acid dyes for the coloration of wool fibers in brown shades, as traditional dyeing with acid dyes produces toxic effluent needing costly treatment. In this work, the valorization of sulfonated kraft lignin was explored by using it as a natural dye for the coloration of wool fabrics alone and with hydrogen peroxide (H 2 O 2 ). The dyed fabrics were characterized by reflectance and diffuse reflectance spectroscopies to assess the color yield and UV protection performance respectively. The dyed fabrics exhibited reasonably good color yield and satisfactory colorfastness to washing (Grade 3/4), which improved to Grade 4 by the oxidation treatment with H 2 O 2 . The SEM images show that when fabrics are dyed alone with lignin, deposition of lignin particles is visible on the fiber surface, but with hydrogen peroxide, no deposition of lignin is visible on the fiber surface, and the color strength of the fabric became almost double. The UV light transmission through the fabric decreased from 6.73 and 13.23% at 311 and 365 nm to 2.19 and 5.23% respectively. The ATR-FTIR spectra of the dyed fabrics showed increased absorption of lignin sulfonate by the fabric, suggesting depolymerization of lignin by H 2 O 2 to smaller macromolecules easing absorption into the wool fiber. Lignin sulfonate could be a cheap and sustainable alternative to harmful synthetic dyes for producing brown shades on wool fabric.