等离子体氧化在大麻纤维脱胶中的应用

为获得大麻纤维节能环保型脱胶工艺，基于水溶液辉光放电的氧化性，以木质素磺酸盐为研究对象，设计正交试验，得到等离子体氧化降解大麻中木质素的最佳条件：大麻质量浓度为210mg/L；放电功率为100W；放电时间为20min。自由基捕捉验证试验、酸碱度测试结果表明，等离子体放电处理水产生了氧化能力极强的羟基自由基和大量的氢离子，等离子体处理水呈酸性，这种酸性氧化水使大麻纤维中胶质去除，木质素氧化降解，半纤维素水解。采用扫描电子显微镜和大麻化学成分分析表征处理前后大麻纤维形态和成分的变化，并测试脱胶残液的化学需氧量、酸碱度。结果表明：经等离子体氧化处理的大麻纤维发生了分裂，木质素、胶质、半纤维素含量降低，纤维素成分提升为73.08%；残液水呈酸性，化学需氧量值为1 500∽2 000mg/L。

Application of plasma oxidation in hemp fiber degumming

In order to obtain an environmental friendly method for hemp degumming, the orthogonal experiment for lignosulfonates was designed based on the oxidation of glow discharge plasma in water. The optimum oxidative degradation conditions for ligninin hemp are as followed. The initial concentration of hemp solution is 210 mg/L, the discharge power is 100 W, and the discharge time is 20 min. Free radicals capture and pH experiments show that plasma discharge creates a large quantity of · OH free radicals and H+. This kind of acid oxidizing water is beneficial to degum hemp fibers by removing pectin, oxidative degrading lignin and hydrolyzing hemicellulose. The degraded products are characterized by scanning electron microscopy and chemical composition analysis. The results show that hemp fibers are splitted. The components of the lignin, pectin and hemicellulose of hemp fiber are decreased. The component of cellulose is increased to 7308%. The pH and chemical oxygen demand ( COD ) results show that the residual water is acidic. Its COD value ranges from 1500-2000 mg/L.