Influence of NaOH concentration on the decolorization of crystal violet dyed cotton fabric
Influence of NaOH concentration on the decolorization of crystal violet dyed cotton fabric
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DOI：
10.4491/eer.2021.643
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发表时间：
2022-04
影响因子：
3.5
通讯作者：
Kristen Mardenborough;Maya Florentino;Robert Haxhari;Yu‐Chung Lin;M. Rafailovich;G. Halada;H. Jung;Taejin Kim
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文献类型：
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作者：
Kristen Mardenborough;Maya Florentino;Robert Haxhari;Yu‐Chung Lin;M. Rafailovich;G. Halada;H. Jung;Taejin Kim
随着纺织品回收在工业中变得越来越流行，合成染料去除是一个越来越受关注的话题。虽然从废水中去除染料的方法已经被广泛研究和报道，但织物本身的脱色研究仍然相当未知。针对这方面的研究不足，本研究提出了用不同浓度的氢氧化钠（NaOH）处理结晶紫（CV）染色的棉织物样品。采用多种表征方法对织物脱色进行了研究。扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）和拉曼光谱数据表明，CV和NaOH处理后的纤维素结构保持不变。仅在对照样品中出现FTIR和拉曼光谱中的特征CV峰，而NaOH处理样品的光谱与棉织物的光谱非常相似。X射线衍射（XRD）数据也证实了纤维素的微晶尺寸不受CV和NaOH处理的影响。可见的紫色色调保持在所有NaOH处理的样品中，虽然CV强度与NaOH浓度成反比。L*a*B* 值用于补充表征结果。随着NaOH浓度的增加，CIELAB参数与普通未处理织物的CIELAB参数更加一致
Synthetic dye removal is a topic of increasing interest as textile recycling has become more popular in industries. While methods involving dye removal from wastewater effluent have been widely studied and reported on, research on decolorization of fabric itself remains quite unknown. In regard to the lack of research, this study presents cotton fabric samples dyed with crystal violet (CV) that were treated with varying concentrations of sodium hydroxide (NaOH). Fabric decolorization was studied using several characterization methods. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and Raman spectroscopy data showed that the cellulose structure remained unchanged after CV and NaOH treatment. Characteristic CV peaks in the FTIR and Raman spectra were apparent only in the control sample, while the spectra of NaOH-treated samples were very similar to that of the cotton fabric. X-ray diffractometry (XRD) data also confirmed that the crystallite size of cellulose was not affected by CV and NaOH treatment. A visible violet hue remained in all NaOH-treated samples, though CV intensity was inversely proportional to NaOH concentration. The L*a*b* values were utilized to complement characterization results. As the concentration of NaOH was increased, the CIELAB parameters aligned more with those of the plain untreated fabric