Re-use of waste wool fibers by chemical treatment-Enhancement of deodorization perfixmance by oxidation and reduction

羊毛纤维用甲酸氧化，其中羊毛角蛋白中的半胱氨酸残基形成半胱酸残基。羊毛纤维也用2-巯基乙醇还原，其中半胱氨酸残基由半胱氨酸残基形成。采用气相色谱法和/或用铝袋和气体检测管的方法评价氧化羊毛纤维的胺吸附和还原羊毛纤维的乙硫醇吸附。羊毛纤维的氧化作用显著提高了氨的吸附性。在500mL的Erlenmyer烧瓶中，氨气（4000ppm）在60m内被氧化羊毛纤维完全吸收。这说明羊毛中氧化形成的磺酸基团有效地吸附了氨。对CnH2n+iNH2 （n=1-4）和（CH3）nNH3-n （n= 2,3）的吸附也进行了评价。胺氮上的烷基取代基越长、越多，氧化羊毛纤维对烷基胺的吸附越慢。这可能是由于它的疏水位阻。重复使用后，氧化羊毛纤维的氨吸附性逐渐变差。虽然氧化羊毛纤维的琥珀酰化对首次使用时的氨吸收量没有影响，但重复使用后，氧化和琥珀酰化羊毛纤维的氨吸收量高于氧化羊毛纤维。这表明羊毛角蛋白中的磺酸基团比羧基基团与氨的结合更快。还原羊毛纤维对乙基硫醇的吸收影响不大，4L体积铝袋中还原羊毛纤维的乙基硫醇（80ppm）在6 h后减少了3-15%，还原羊毛纤维的含水量对乙基硫醇的吸收有影响。含水量为100%的还原羊毛纤维的吸附能力最强。

Wool fibers were oxidized with performic acid, where cysteic acid residues were formed from cysteine residues in wool keratin. Wool fibers were also reduced with 2-mercaptoethanol, where cysteine residues were formed from cysteine residues. Amines sorption of the oxidized wool fibers and ethylmercaptan sorption of the reduced wool fibers were evaluated with gas chromatography and/or the method using aluminum bag and a gas-detecting tube. The oxidation of wool fibers remarkably improved the sorption of ammonia. Ammonia gas (4000ppm) in a 500mL Erlenmyer flask was completely sorbed in oxidized wool fibers in 60m. This shows that sulfonic acid group which was formed in wool by oxidation effectively acts in sorption of ammonia. The sorption of CnH2n+iNH2 (n=1-4) and (CH3)nNH3-n (n=2, 3) was also evaluated. The longer and the more alkyl substituents on nitrogen of the amine were, the more slowly oxidized wool fibers sorbed the alkylamines. This is probably due to its hydrophobic steric hindrance. Ammonia sorption of oxidized wool fibers deteriorated gradually after repetition-use. Though succinylation of oxidized wool fibers showed no effect on absorption of ammonia at first use, oxidized and succinylated wool fibers sorbed more ammonia than oxidized ones after the repetition-use. This suggests that sulfonic acid group in wool keratin more quickly binds with ammonia than carboxylic group.Reduction of wool fibers showed a little effect on absorption of ethyl mercaptan : ethyl mercaptan (80ppm) over reduced wool fibers in aluminum bag of 4L volume decreased by 3-15% after 6 h. Water content of reduced wool fibers had influence on the sorption of ethylmercaptan. Reduced wool fibers of which water content was 100%, showed the highest sorp ability.