摘要
该文研究了臭氧氧化对印染废水中典型化学污染物聚乙烯醇(PVA)的降解效果,考察了臭氧投加量、PVA初始浓度、温度与pH对PVA去除效果的影响,探究了PVA臭氧化中的氧化机制。结果表明,当臭氧投加量为7 mg/L、PVA浓度为50 mg/L、pH为7、温度为20℃时,反应60 min后,PVA的去除率为99.7%。机理研究表明,臭氧的直接氧化在PVA降解过程中起主要作用,羟基自由基(·OH)的间接氧化对PVA的降解也有部分贡献,·OH淬灭实验显示,加入100 mg/L的叔丁醇后,PVA降解率下降至74.5%。紫外全波长扫描与傅立叶变换红外光谱结果表明,PVA分子的随机断链是PVA氧化降解的主要途径。
The effectiveness of applying ozonation for degradation of polyvinyl alcohol(PVA),a typical chemical contaminant in textile and dyeing wastewater,was investigated.The effects of parameters including ozone dosage,initial PVA concentration,temperature and pH on the degradation of PVA were studied,and the mechanism of ozonation of PVA was explored.As a result,it was showed that on condition that the dosage of ozonec was 7 mg/L,PVA concentration 50 mg/L,p H value 7,and temperature 20℃,the degradation efficiency of PVA could be up to 99.7%.In terms of the ozonation mechanism.the direct oxidation of ozone played a major role in the degradation of PVA,and the indirect oxidation of hydroxyl radical(·OH)also contributed to the degradation process of PVA to some extent;and the·OH quenching experiment revealed that the degradation effectiveness of PVA would declined to 74.5%after adding 100 mg/L of tert-butanol(TBA).Moreover,results of ultraviolet full-wavelength scanning and Fourier transform infrared spectroscopy indicated that the random chain breaking of PVA molecules was the main way to oxidative degradation of PVA.
作者
陆雨轩
马永平
刘晨
孙迎雪
LU Yuxuan;MA Yongping;LIU Chen;SUN Yingxue(School of Ecology and Environment,Beijing Technology and Business University,Beijing 100048,China;State Environmental Protection Key Lab of Food Chain Pollution Control,Beijing Technology and Business University,Beijing 100048,China;Key Lab of Cleaner Production and Integrated Resource Utilization of China National Light Industry,Beijing Technology and Business University,Beijing 100048,China;Economic Development Board Management Committe of Ningdong Energy Chemical Industry Base,Yinchuan 750409,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2022年第1期108-113,共6页
Environmental Science & Technology
关键词
印染废水
聚乙烯醇
臭氧氧化
氧化机制
textile and dyeing wastewater
polyvinyl alcohol
ozonation
oxidation mechanism
