摘要
利用硫化亚铁(FeS)催化臭氧降解对硝基苯酚(PNP),通过单因素实验,考察催化剂投加量、臭氧浓度、反应温度、溶液pH等因素对FeS/O_(3)体系降解PNP效率的影响规律。结果表明,PNP降解效率随催化剂投加量和臭氧浓度的增加而增加;15~35℃时,PNP降解效率随温度的增加先升高后降低,在25℃时降解效率最高;pH在3~11范围时,pH越大,降解效率越高。考虑到工程应用经济性及Fe^(2+)排放限值,得出最佳处理工艺参数:FeS投加量为0.5 g/L,臭氧质量浓度为40 mg/L,温度为25℃,pH为7。最佳反应参数下,3 min内FeS/O_(3)体系对PNP的降解率达到90.04%,较单独臭氧降解提高了10.1%。通过SEM分析了反应前后FeS的表面形貌和晶体结构,发现其具有良好的稳定性,在连续5次循环实验中,反应6 min时PNP的去除率均能保持在93%以上。通过气相色谱-质谱探究了PNP降解可能存在的中间产物和降解途径,利用自由基猝灭实验证实了FeS/O_(3)体系降解PNP过程中羟基自由基(·OH)对提升反应速率具有重要作用。
In this study,ferrous sulfide(FeS)was used to catalyze the degradation of p-nitrophenol(PNP)by ozone.The effects of catalyst dosage,ozone concentration,reaction temperature and solution pH on the degradation effi-ciency of PNP in FeS/O_(3)system were obtained by single factor experiments.The results showed that the degradation efficiency of PNP increased with the increase of catalyst dosage and ozone concentration.Between 15℃and 35℃,the degradation efficiency of PNP first increased and then decreased with the increase of temperature,and the degra-dation efficiency was the highest at 25℃.When the pH was in the range of 3 to 11,the greater the pH,the higher the degradation efficiency.Considering the economy of engineering application and the limit of Fe^(2+) ion emission,the optimal processing parameters were obtained as follows:FeS dosage of 0.5 g/L,ozone concentration of 40 mg/L,temperature of 25℃,pH of 7.Under the optimal reaction parameters,the degradation rate of PNP by FeS/O_(3)system reached 90.04%within 3 min,which was 10.1%higher than that by ozone alone.The surface morphology and crys-tal structure of FeS before and after the reaction were analyzed by SEM,and it was found that it had good stability.In 5 consecutive cycles,the removal rate of PNP remained above 93%after 6 min of reaction.Possible intermediates and degradation pathways of PNP degradation were investigated by gas chromatography mass spectrometry.Hy-droxyl radical(·OH)as an important role in improving the reaction rate during the degradation of PNP by FeS/O_(3)system was confirmed by radical quenching experiments.
作者
王尧
陈明富
王继杭
彭烁
周鑫
张文浩
蒋丽芳
郭勇
WANG Yao;CHEN Mingfu;WANG Jihang;PENG Shuo;ZHOU Xin;ZHANG Wenhao;JIANG Lifang;GUO Yong(School of Chemical Engineering,Sichuan University,Chengdu 610207,China;Renhuai City Water Investment Development Limited Liability Company,Renhuai 564500,China)
出处
《工业水处理》
北大核心
2025年第4期92-98,共7页
Industrial Water Treatment
基金
生态环境管理综合技术服务项目(23H1125)。
关键词
催化氧化
对硝基苯酚
臭氧
硫化亚铁
catalytic oxidation
p-nitrophenol
ozone
ferrous sulfide
作者简介
第一作者:王尧(1997-),硕士,E-mail:906526080@qq.com;通讯作者:郭勇,博士,副教授,E-mail:gy@scu.edu.cn。
