Characterization of Chromium(VI) Adsorption onto Silk Fabrics

견직물에의 크롬(VI)의 흡착 특성

  • 김규범 (진주산업대학교 섬유공예학과) ;
  • 진영길 (경상대학교 의류학과)
  • Published : 1996.06.01

Abstract

The adsorption mechanism of Chromium(VI) uptake in silk fibroin fibers was discussed. The adsorption equilbrium of Chromium(VI) is significantly influenced by the initial adsorption rate and it showed 52% of the equilibrium uptake. The Chromium(VI) uptake by silk fibroin in increased with the acidic range of pH, which react upon Chromium(VI) oxidations. The enthalpy change in the Chromium(VI) on the temperatures, $\Delta$H, was found to be 39.7 KJ.mol-1, It means that the Chromium(VI) adsorption proceeds via a certain complex chemical reaction and the Chromium complex was found to be coordinated with carbonyl group of amides from the result of infrared spectra. The chroming of silk fibroin fibers in moderated in the conditions of 5$0^{\circ}C$, pH 2.4, and 3 hours, which prevent from the loss of physical properties. The equilibrium adsorption is attained at 5 X 10-3M of Chromium(VI) solutions.

견 피브로인 섬유에 의한 Cr(VI)의 흡착 특성을 분석하였다. Cr(VI)의 흡착평형은 초기 흡착속도에 큰 영향을 받고 있으며 평형흡착량의 52% 정도에 이르고 있다. 견 피브로인 섬유에 의한 Cr(VI)의 흡착은 크롬염의 산화반응을 일으키는 산성의 pH 범위에서 흡착량이 증가한다. Cr(VI)의 흡착온도에 대한 엔탈피($\Delta$H)의 변화는 39.7KJ.mol-1로 얻어졌다. 이것은 Cr(VI)의 흡착이 착제 화학적 반응이라는 것을 의미하며 IR 스펙트럼의 결과에서도 아미드 형 카르보닐의 배위에 의한 착물형성이 확인되었다. 또한, 견 피브로인 섬유의 크롬 흡착처리에서 물성의 과도한 저하를 고려한 조건은 온도 5$0^{\circ}C$ pH 2.4, 3시간의 처리가 적당하고 5 X 10-3M의 농도에서 흡착평형에 도달하였다.

Keywords

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