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(jī)理

A magnetic-void-porous MnFez04/carbon microspheres nano-catalyst for catalytic ozonation: Preparation, performance and mechanism

摘要

污水處理對(duì)保障人類健康和生態(tài)安全至關(guān)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(shù)。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(dǎo)致催化能力衰減等缺點(diǎn)的限制，可能造成嚴(yán)重的資源浪費(fèi)，并對(duì)人類健康和生態(tài)系統(tǒng)造成潛在風(fēng)險(xiǎn)。為了解決這些問(wèn)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(shí)驗(yàn)表明，在外加磁場(chǎng)作用下，CMS-MnFe2O4在2 min內(nèi)可快速分離。在催化臭氧氧化草酸(OA)過(guò)程中，CMS-MnFe2O4表現(xiàn)出高效穩(wěn)定的催化效率，總有機(jī)碳去除率最高可達(dá)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(xué)穩(wěn)定性，并通過(guò)電子轉(zhuǎn)移將金屬離子浸出率降低到MnFe2O4的10 - 20%。為了探究其催化機(jī)理，我們進(jìn)行了自由基實(shí)驗(yàn)，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(shè)備為：3S-A3臭氧發(fā)生器和3S-J5000臭氧檢測(cè)儀。