牦牛绒过氧化氢/过硫酸铵脱色体系工艺优化及其机制

针对现有商业化牦牛绒脱色过程复杂、脱色时间长等问题,提出新型过氧化氢/过硫酸铵体系牦牛绒脱色工艺.在尽可能提高纤维白度的前提下尽量减少纤维损伤,通过单因素试验确定了脱色时间、过硫酸铵用量和试剂pH值,对脱色工艺进行探讨并与商业化脱色牦牛绒进行比较.结果表明:采用过硫酸铵质量浓度为400 g/L,试剂pH值为9,在室温下...

Optimization and mechanism of hydrogen peroxide/ammonium persulfate bleaching for yak wool

A novel decolorization process for yak wool with hydrogen peroxide/ammonium persulfate system was proposed to reduce the long decolorization time and shorten the commercial treatment process line.In order to improve fiber whiteness and minimize fiber damage,the effect of the decolorization time,ammonium persulfate dosage and pH value on yak wool in this process were discussed and compared with the commercial decolored yak wool via single-factor tests.The results show that with the decolorization time being 180 min at room temperature,the dosage of ammonium persulfate 400 g/L and pH value 9,and the decolorizing time 1/8 of that of commercial process,the yak wool bleached using this scheme has almost the same quality as that bleached using the commercial process.The bleaching mechanism is analyzed and found that the sulfate radical and the hydroxyl radical in this process played the main and secondary roles,receptively.This bleaching process is easier,providing a new solution for the high value utilization of yak wool.