Tailoring Hydrophilicity of Cotton Thread for Efficient Separation of Sudan I and Rhodamine B
XIONG Jing1,2, LI Yadan1,2, WU Liang1,2, XIAO Gang1,2, WANG Xin3, LIANG Liping1,2, QIAO Yan1,2, LU Zhisong1,2, YU Ling1,2
1 Key Laboratory of Luminescence Analysis and Molecular Sensing, Ministry of Education, School of Materials & Energy, Southwest University, Chongqing 400715, China 2 Institute for Clean Energy & Advanced Materials, School of Materials & Energy, Southwest University, Chongqing 400715, China 3 College of Food Science, Southwest University, Chongqing 400715, China
Abstract: Thread has been used as a low-cost solid phase for chromatographic separation of organic pigments. However, the role of thread hydrophilicity in the separation has not been systematically investigated. Moreover, direct harvesting of separated pigments has not been achieved, either. Herein, a cotton thread-based system with controlled hydrophilicity was fabricated for the separation and harvesting of Sudan I and Rhodamine B in the mixture. The thread was exposed to oxygen plasma at different powers, durations and enwinding ways to tailor its hydrophilicity. The thread enwound on a shelf in a zigzag pattern could reach the highest hydrophilicity after exposure to the plasma at the power of 10.15 W for 8 min. The separation of Sudan I and Rhodamine B greatly depends on the thread hydrophilicity and the solvent used to dissolve them. The pigments-formic acid/methanol system could achieve the most effective separation on the thread with the highest hydrophilicity. A mechanism involving the affinity of pigments to the fibers and the transfer capability of the solvent was proposed to explain the hydrophilicity-dependent separation process on the thread. Based on the mechanism, the separated pigments were eluted from the thread-based chromatographic system with formic acid/methanol solution. Rhodamine B can be harvested at the initial 20 min. After 30 min, Sudan I is the prominent substance in the eluted solution. This work may not only reveal the critical role of hydrophilicity in the thread-based chromatographic system, but also expand its application in pigment separation and harvest.
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2021, Vol. 35 
