Sheep Wool Humidity under Electron Irradiation Affects Wool Sorptivity towards Co(II) Ions

Molecules

Zuzana Branišová¹  Mária Porubská²  Jana Braniša²  Marcel Cvik²  Klaudia Jomová²  Angela Kleinová³  Róbert Weissabel⁴ 

[1] Department of Art Education, Faculty of Education, Trnava University, Priemyselná 4, 918 43 Trnava, Slovakia;Department of Chemistry, Faculty of Natural Sciences, Constantine the Philosopher University in Nitra, Tr. A. Hlinku 1, 949 01 Nitra, Slovakia;Polymer Institute, Slovak Academy of Sciences, Dúbravská Cesta 9, 845 41 Bratislava, Slovakia;Progresa Final SK, s.r.o., Ferienčíkova 18, 811 08 Bratislava, Slovakia;

关键词: sheep wool;    keratin;    electron irradiation;    modification;    humidity;    sorptivity;   

DOI  :  10.3390/molecules26175206

来源: DOAJ

【 摘 要 】

The effect of humidity on sheep wool during irradiation by an accelerated electron beam was examined. Each of the samples with 10%, 53%, and 97% relative humidity (RH) absorbed a dose of 0, 109, and 257 kGy, respectively. After being freely kept in common laboratory conditions, the samples were subjected to batch Co(II) sorption experiments monitored with VIS spectrometry for different lapses from electron beam exposure. Along with the sorption, FTIR spectral analysis of the wool samples was conducted for cysteic acid and cystine monoxide, and later, the examination was completed, with pH measuring 0.05 molar KCl extract from the wool samples. Besides a relationship to the absorbed dose and lapse, the sorptivity results showed considerable dependence on wool humidity under exposure. When humidity was deficient (10% RH), the sorptivity was lower due to limited transformation of cystine monoxide to cysteic acid. The wool pre-conditioned at 53% RH, which is the humidity close to common environmental conditions, demonstrated the best Co(II) sorptivity in any case. This finding enables the elimination of pre-exposure wool conditioning in practice. Under excessive humidity of 97% RH and enough high dose of 257 kGy, radiolysis of water occurred, deteriorating the sorptivity. Each wool humidity, dose, and lapse showed a particular scenario. The time and humidity variations in the sorptivity for the non-irradiated sample were a little surprising; despite the absence of electron irradiation, relevant results indicated a strong sensitivity to pre-condition humidity and lapse from the start of the monitoring.

【 授权许可】

Unknown