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RISS 인기검색어
- 검색키워드
- 저자 : Gary Halada (검색결과 3 건)
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Influence of NaOH concentration on the decolorization of crystal violet dyed cotton fabric
Kristen Mardenborough,Maya Florentino,Robert Haxhari,Yu-Chung Lin,Miriam Rafailovich,Gary Halada,Hye Jung Jung,Taejin Kim 대한환경공학회 2023 Environmental Engineering Research Vol.28 No.2
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<SUP>*</SUP>a<SUP>*</SUP>b<SUP>*</SUP> 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.
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Muslin Deweaving through Combined Mechanical, Thermal and Chemical Methods
Hang Zhang Cao,Jamie DeCoster,Jamie DeCoster,Kelvin Linskens,Kareem Mehdi,Yizhi Meng,Gary Halada,Hye-Jung Jung,Theanne Schiros,Asta Skocir,Taejin Kim 한국섬유공학회 2022 Fibers and polymers Vol.23 No.11
Fabric waste has become an escalating problem that stems from the ever-shortening clothing lifecycle. Previouscotton recycling processes used mechanical methods to break the cotton down into fiber; this comes at the cost ofcompromised strength. Sodium hydroxide has long been used in the textile industry to increase dye absorption and lusterthrough mercerization. In this paper, the deweaving of cotton muslin fabric was attempted using the chemical interactions ofNaOH in combination with heat and mechanical forces through agitation. Different NaOH concentrations were tested todetermine the optimum condition for fabric decomposition on a laboratory scale. Overall, the muslin fabric treatment with0.5 M NaOH yielded the most promising results for fiber quality retention and chemical usage. The NaOH solution wasshown to be feasible in effectively deweaving multiple muslin fabrics consecutively. While the deweaving process reducesthe mechanical strength of the fabric, overall, the recycling method was successful in minimizing chemical waste anddeweaving time.
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Thermochemical degradation of cotton fabric under mild conditions
Michael Cuiffo,정혜정,Asta Skocir,Theanne Schiros,Emily Evans,Elizabeth Orlando,Yu-Chung Lin,Yiwei Fang,Miriam Rafailovich,Taejin Kim,Gary Halada 한국의류학회 2021 Fashion and Textiles Vol.8 No.1
Textile waste presents a major burden on the environment, contributing to climate change and chemical pollution as toxic dyes and finishing chemicals enter the environment through landfill leachate. Moreover, the majority of textile waste reaching landfills is discarded clothing, which could be reused or recycled. Here we investigate environmentally benign morphology changing of cotton textiles as a precursor for reintegration into a circular materials economy. At 50 °C using low concentrations of acids and bases, the interfiber structures of woven cotton were successfully degraded when treated with the following sequence of chemical treatment: citric acid, urea, sodium hydroxide, ammonium hydroxide, and sodium nitrate. Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) reveal separation of the constituent fibers without depolymerization of the cellulose structure, and streaming potential measurements indicate that surface charge effects play a key role in facilitating degradation. The proposed reaction procedures show feasibility of effective waste-fabric recycling processes without chemically intensive processes, in which staple fibers are recovered and can be re-spun into new textiles.
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