【摘要】 为了研究高级氧化法脱除聚乙烯醇(PVA)浆料清洁生产新工艺的可行性,研究了3种高级氧化法UV/H2O2、UV/TiO2、Nafion-Fe2+/H2O2对含PVA溶液的氧化降解,其降解效果依次为:UV/H2O2>Nafion-Fe2+/H2O2>UV/TiO2。对于UV/H2O2法,PVA降解速率与H2O2的初始浓度成正相关,且H2O2浓度为2.95 mmol/L时14 m in内就能使PVA的去除率达到98%;pH和温度对PVA的氧化降解效果影响不明显。在此基础上,对建立在高级氧化法基础上的退浆新工艺进行了探讨,结果表明,在65℃和75℃下,高级氧化法条件下的纯棉织物PVA退浆率分别达到70.16%和95.65%;该法不仅可以促进PVA从纯棉织物上的脱附,而且可以达到对PVA的较高降解效果,使得所排退浆废水的生化处理难度明显降低。更多还原

【Abstract】 In order to study the feasibility of new cleaner production process of polyvinyl alcohol（PVA） removal with advanced oxidation processes（AOPs）,the degradation of PVA was investigated by using three types of AOPs: UV/H₂O₂、UV/TiO₂、Nafion-Fe²⁺/H₂O₂.The results indicated that the degradation efficiencies of PVA were in the following sequence: UV/H₂O₂>Nafion-Fe²⁺/H₂O₂>UV/TiO₂.In terms of UV/H₂O₂ system,the degradation rate of PVA increased with the initial concentration of hydrogen peroxide,the degradation percentage of PVA reached up to 98 % under the concentration of 2.95 mmol/L H₂O₂ within 14 min.However,the pH value and the temperature affected the process slightly.The desizing rate from cotton fabrics reached 70.16 % and 95.65 % under 65 ℃ and 75 ℃ in the new cleaner process,respectively.This new process accelerated the desorption of PVA from the cotton fabrics and achieved high removal efficiency of PVA,consequently increasing the biodegradability of the desizing wastewater.更多还原