Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (03): 20-25.doi: 10.13475/j.fzxb.20180401407

• Fiber Materials • Previous Articles     Next Articles

Preparation and adsorption kinetics of calixarene fibers with selective adsorption of Pt(IV)

TAO Xuchen(), LI Lin   

  1. College of Textiles and Clothing, Anhui Polytechnic University, Wuhu, Anhui 241000, China
  • Received:2018-04-08 Revised:2018-12-02 Online:2019-03-15 Published:2019-03-15

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Abstract:

In order to prepare novel selective adsorption fibers containing calixarene, calixarene polyamide acid (CPAA) fibers were firstly prepared by amidating and electrospinning. Subsequently, the calixarene polyimide (CPI) fibers were obtained by thermal imidization of the CPAA fibers. The CPI and CPAA fibers were characterized by Fourier transform infrared spectrometer, scanning electron microscope and thermogravimetric analysis. The adsorption selectivity and adsorption kinetics of the CPI fibers were also investigated. The results show that calixarene is successfully incorporated into the CPAA and CPI fibers. The CPI fibers possess smaller diameter and higher thermal degradation temperatur by comparison with the CPAA fibers. Only the CPI fibers can adsorb Pt(IV) selectively from the mixture of Pt(IV) and Ag(I). The maximum Pt(IV) absorption capacity of CPI fibers is 28 mg/g at pH 7, and its adsorption behavior fits well with the first-order adsorption kinetics model. The adsorption rate constant is 0.003 9 min-1 at 20 ℃ and increases with the elevating adsorption temperature. The required activation energy for adsorption is only 12.24 kJ/mol, which indicates the CPI fibers adsorbing Pt(IV) is easy to occur.

Key words: calixarene fiber, polyimide, selective adsorption, adsorption kinetics

CLC Number: 

  • TQ342

Fig.1

Preparation process of CPI fibers"

Fig.2

SEM images of CPAA(a)and CPI(b)fibers(×5 000)"

Fig.3

FT-IR spectra of CPAA and CPI fibers"

Fig.4

TG curves of CPAA and CPI fibers"

Fig.5

Adsorption of Pt(IV) and Ag(Ⅰ) on common PI, CPAA and CPI fibers"

Fig.6

Adsorption kinetics curves of Pt(Ⅳ) on CPI fibers"

Fig.7

Relationship between lg (-dc0/dt) and lgc0"

Fig.8

Relationship between lnct and t at various temperatures"

Fig.9

Relationship between lnk and 1/T"

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