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

羊毛纤维用过甲酸氧化，其中半胱氨酸残基由羊毛角蛋白中的半胱氨酸残基形成。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。用气相色谱法和铝袋法及气体检测管法分别测定了氧化羊毛纤维对胺的吸附和还原羊毛纤维对乙基砜的吸附。羊毛纤维的氧化处理显著提高了氨的吸附性能。在500mL锥形瓶中，氨气（4000ppm）在60分钟内完全吸附在氧化羊毛纤维上。这表明羊毛中通过氧化形成的磺酸基有效地吸附了氨。同时还研究了CnH_2n + iNH_2（n = 1 - 4）和（CH_3）nNH_3-n（n = 2，3）的吸附。胺的氮原子上烷基取代基越长、越多，羊毛纤维对烷基胺的吸附越慢。这可能是由于它的疏水空间位阻。氧化羊毛纤维在反复使用后对氨的吸附性能逐渐变差。虽然琥珀酰化对氧化羊毛纤维在首次使用时的氨吸收没有影响，但氧化羊毛纤维和琥珀酰化羊毛纤维在重复使用后比氧化羊毛纤维吸收更多的氨。羊毛纤维的还原作用对乙醯胺的吸收影响不大，在4L铝袋中，80ppm的乙醯胺在还原羊毛纤维上，6h后下降3-15%。还原后羊毛纤维的含水量对乙叉草醚的吸附有影响。含水率为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.