JOURNAL OF TEXTILE RESEARCH ›› 2017, Vol. 38 ›› Issue (03): 13-17.doi: 10.13475/fzxb.20160402606
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In order to adsorb noble metals ions, calixarene-polyimide (calixarene-PI) fibers were fabricated by design and synthesis of 5,17-diamino-26,28-(1’,8’-dioxa-4’,5’-dithiaoctane)-calix[4]arene monomer, preparation of calixarene-polyamide acid (calixarene-PAA) spinning solution by amidation, fabrication of the calixarene-PAA fibers by electrospinning, and preparation of calixarene-PI fibers by thermal imidization on calixarene-PAA fibers. Calixarene-PI fibers were characterized by Fourier transform infrared spectrography and scanning electronic microscopy, and their adsorption on Pt(Ⅳ), Ag (Ⅰ) and Au (Ⅰ) was studied. FT-IR indicates calix[4]arene monomer is incorporated into calixarene-PI fibers is (400±40)nm. Calixarene-PI fibers display strong adsorption on Pt(Ⅳ)rather than Ag (Ⅰ) and Au (Ⅰ), which fit with the Langmuir isothermal adsorption model. The saturated amount of Pt(Ⅳ)adsorped by calixarene-PI fibers is 3.1 mmol/g. The electron distribution in the outermost of Pt(Ⅳ)is 5d6, which indicates the 5d electron layer of Pt(Ⅳ)is not fully occupied by electrons. Pt(Ⅳ)can accept electrons of O or S in 1,8-dioxa-4,5-dithiaoctane attached in calixarene-PI fibers. Therefore, the coordinative adsorption between Pt(Ⅳ)and calixarene-PI fibers can be formed.
Key words: calixarene fiber, selective adsorption, Pt(IV), isothermal adsorption model
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URL: http://www.fzxb.org.cn/EN/10.13475/fzxb.20160402606
http://www.fzxb.org.cn/EN/Y2017/V38/I03/13
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