摘要
使用碱式共沉淀法成功制备Fe(Mn)OOH催化剂,并且证实Fe(Mn)OOH可以高效催化臭氧降解水中扑米酮(PMD)和溶解性有机物(DOMs).表征分析表明,Fe(Mn)OOH表现出α-FeOOH和MnFe2O4两相的特征晶相结构.在相同条件下,Fe(Mn)OOH催化臭氧体系比单独臭氧、MnFe2O4和FeOOH催化臭氧体系表现出更好的扑米酮降解效能.在20 min时,Fe(Mn)OOH催化臭氧体系可以降解去离子水中97.5%的扑米酮,并且在快速和慢速反应阶段的反应速率常数分别可达0.46044 min-1和0.10723 min-1.结果还表明,初始扑米酮和臭氧浓度以及催化剂投量之间的配比关系可能对扑米酮的降解有重要影响.Fe(Mn)OOH催化体系遵循羟基自由基的反应机制,可能是通过促进臭氧快速分解产生大量的羟基自由基,进而提高了水中有机物的降解效能.此外,Fe(Mn)OOH还具有结构稳定,可重复利用性好的优势.
Fe(Mn)OOH was successfully synthesized using co-precipitation method in alkaline condition,and proved to be an efficient catalyst in catalytic ozonation of primidone(PMD)and dissolved organic matter(DOMs)in water.Characterization indicated that Fe(Mn)OOH exhibited both two characteristic crystal structures ofα-FeOOH and MnFe2O4 phases.Under the same condition,Fe(Mn)OOH catalytic ozonation system exhibited higher PMD degradation efficiency compared with sole ozonation system,MnFe2O4 and FeOOH catalytic ozonation systems.In 20 min,97.5%primidone could be degraded in Fe(Mn)OOH catalytic ozonation system,and the kinetics constants in rapid and slow process were up to 0.46044 min-1 and 0.10723 min-1,respectively.The results also suggested that the ratio relation among the initial PMD and ozone concentrations as well as catalysts dosages might significantly affect PMD degradation.Fe(Mn)OOH catalytic ozonation followed the hydroxyl radicals reaction mechanism,and could generate a number of hydroxyl radicals by promoting rapid ozone decomposition,which improved the degradation efficiency of organic compounds in water.In addition,Fe(Mn)OOH also had advantages of stable structure and good reusability.
作者
刘士诚
徐贞贞
刘晓静
宋俊学
蔡敏
鲁成秀
LIU Shicheng;XU Zhenzhen;LIU Xiaojing;SONG Junxue;CAI Min;LU Chengxiu(College of Geography and Environment,Shandong Normal University,Ji'nan,250358,China)
出处
《环境化学》
CAS
CSCD
北大核心
2020年第5期1217-1224,共8页
Environmental Chemistry
基金
国家自然科学基金(51408349)
山东省自然科学基金(ZR2015DM012)资助
