磁孔多孔MnFe2O4/碳微球納米催化臭氧化催化劑的制備、性能及機理

摘要

污水處理對保障人類健康和生態(tài)安全至關重要。納米催化劑催化臭氧化是一種被廣泛研究的高效處理技術。然而，這種方法一直受到納米催化劑易丟失、難以分離和再利用、聚合導致催化能力衰減等缺點的限制，可能造成嚴重的資源浪費，并對人類健康和生態(tài)系統(tǒng)造成潛在風險。為了解決這些問題，利用可再生的天然微藻成功合成了磁孔多孔MnFe2O4/碳微球殼納米催化劑(CMS-MnFe2O4)。分離實驗表明，在外加磁場作用下，CMS-MnFe2O4在2 min內可快速分離。在催化臭氧氧化草酸(OA)過程中，CMS-MnFe2O4表現(xiàn)出高效穩(wěn)定的催化效率，總有機碳去除率最高可達96.59%，4次循環(huán)后仍保持93.88%的效率。穩(wěn)定的催化效率是由于碳微球殼的支撐作用，它顯著提高了CMS-MnFe2O4的化學穩(wěn)定性，并通過電子轉移將金屬離子浸出率降低到MnFe2O4的10 - 20%。為了探究其催化機理，我們進行了自由基實驗，提出了一種涉及超氧陰離子而非羥基自由基的OA降解新途徑。因此，本研究表明可以制備一種高效、可回收、穩(wěn)定、耐用的催化臭氧化催化劑。

Catalytic ozonation processThe ozonation experiments were carried out in a laboratory-scale reactor (ca. 1.5 L) equipped with agitation.  Ozone was pro-duced using pure oxygen in an ozone generator (3S-A3, Tonglin,China) monitored with an ozone analyzer (3S-J5000, Tonglin,China), and continuously bubbled into the OA solution through aporous titanium alloy aerator.  Ozone leaving the reactor wasremoved with an ozone destructor

摘自:

Xiaoguang Jin a b c, Changyong Wu b c, Xiangmiao Tian a b c, Panxin Wang b c, Yuexi Zhou b c, Jiane Zuo a

a.State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China

b.State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China

c.Research Center of Environmental Pollution Control Engineering Technology, Chinese Research Academy of Environment Sciences, Beijing, 100012, China

使用臭氧設備為：3S-A3臭氧發(fā)生器和3S-J5000臭氧檢測儀。