Impact of NaOH Concentration on Deweaving of Cotton Fabric in Aqueous Solutions
Impact of NaOH Concentration on Deweaving of Cotton Fabric in Aqueous Solutions
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DOI：
10.3390/su13042015
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发表时间：
2021-02
期刊：
影响因子：
3.9
通讯作者：
H. Cao;Y. Yao;G. Halada;Hyeyeon Jung;Taejin Kim
中科院分区：
文献类型：
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作者：
H. Cao;Y. Yao;G. Halada;Hyeyeon Jung;Taejin Kim
在过去的十年里，人们越来越关注棉织物废料的回收利用。在本研究中，不同浓度的氢氧化钠（NaOH）从1 M到4 M的范围内使用热机械退织棉织物。用1 M NaOH和2 M NaOH处理的织物部分地脱织，而用3 M NaOH和4 M NaOH处理的织物完全脱织。采用傅里叶变换红外光谱（FTIR）分析了棉织物的化学成分和结构。FTIR光谱表明，经1-2 M NaOH处理的棉织物的结构与原始织物的结构相似，但观察到NaOH的存在。在用3-4 M NaOH处理的样品的情况下，除了纤维素II的形成之外，峰位置和谱带强度都发生了变化。FTIR光谱的回收NaOH处理的棉织物进行了比较，并没有发现重大的结构变化。用去离子（DI）水的后处理去除了过量的Na+离子，样品显示出与原始材料类似的分子结构。这些结果表明，作为一种新的方法，回收纤维素织物废料的洗涤后处理的NaOH水溶液的可行性。
In the past decade, there has been increasing attention paid to the recycling of cotton fabric waste. In the present study, different concentrations of sodium hydroxide (NaOH) ranging from 1 M to 4 M were used to thermomechanically deweave cotton fabric. The fabrics treated with 1 M NaOH and 2 M NaOH were partially deweaved, whereas those treated with 3 M NaOH and 4 M NaOH were completely deweaved. Fourier-transform infrared (FTIR) spectroscopy was applied to analyze the chemistry and structure of the cotton fabric. The FTIR spectra indicated that the structure of cotton fabrics treated with 1–2 M NaOH were similar to that of pristine fabric, while the presence of NaOH was observed. In the case of samples treated with 3–4 M NaOH, both the peak positions and the band intensities were changed, in addition to the formation of cellulose II. FTIR spectra for the recycled NaOH-treated cotton fabrics were compared, and no major structural changes were identified. A post-treatment with deionized (DI) water removed excess Na+ ions, with the sample showing a similar molecular structure to that of the pristine material. These results suggest the feasibility of recycling aqueous NaOH for post-washing treatment as a new method for recycling cellulosic fabric waste.