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A rational modification route to an amphiprotic cotton fiber as adsorbent for dyes
Xiong Jiaqing
Tao Jin
Guo Kun
Jiao Chenlu
Zhang Desuo
Lin Hong
Chen Yuyue
Fibers and Polymers, 2015, 16(7): 1512-1518.
Two different modification routes (route 1 and route 2) were attempted to synthesize the amphiprotic cotton fiber (AP-cotton) as dyes adsorbent. Specifically, both the cationic monomer (3-chloro-2-hydroxypropyl trimethyl ammonium chloride, CTA) and anionic monomer (2-acrylamide-2-methyl propane sulfonic acid, AMPS) were introduced into the cotton fibers in a different order and the resulting AP-cottons (CTA/AMPS-cotton and AMPS/CTA-cotton) were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and field emission scanning electron microscopy (SEM). The adsorption capacities of two kinds of AP-cottons for dyes were studied. The results indicate that the route 1 is a feasible way to introduce CTA and AMPS into cotton fiber by chemical binding, and the resulting CTA/ AMPS-cotton can adsorb both anionic dye (Congo red, CR) and cationic dye (Methele blue) effectively while the adsorption capacity is around 142.8 mg/g and 88.2 mg/g, respectively. However, the AMPS/CTA-cotton obtained by route 2 can only adsorb about 35.8 mg/g for CR and 43.9 mg/g for MB at most, because the surface of cotton fiber are mainly coated with the AMPS and CTA by physisorption. As a result, the route 1 is believed a better method for synthesis of AP-cotton compared with the route 2.
Modification; Amphiprotic cotton fiber; Adsorbent; Dyes
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