Nanoarchitecturing bimetallic manganese cobaltite spinels for sonocatalytic degradation of oxytetracycline
Nanoarchitecturing bimetallic manganese cobaltite spinels for sonocatalytic degradation of oxytetracycline
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DOI：
10.1016/j.cej.2021.133851
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发表时间：
2022-03-01
影响因子：
15.1
通讯作者：
Doustkhah, Esmail
中科院分区：
文献类型：
--
作者：
Hassandoost, Ramin;Kotb, Ahmed;Doustkhah, Esmail
使用氧化物降解水介质中新出现的污染物是一种很有前途的新策略，需要在氧化物中设计新的催化途径以进行高级氧化;然而，合成和开发具有增强的可持续催化特征的此类材料的几个挑战仍在研究中。这项研究提出了有效地使用锰钴尖晶石化合物的声催化。制备了三种不同形貌的钴酸锰催化剂，并将其用于超声催化降解土霉素。通过在合成初期改变Mn和Co前驱体的量来调节钴酸锰的形貌。采用多种技术制备了具有不同结构的锰钴尖晶石-多孔层状立方体（MCO-PLC）、层状椭球体（MCO-LE）和粗糙球状体（MCO-RS）。一个有前途的催化降解能力的MCO-PLC土霉素（10.0毫克L-1），在自然pH值在120分钟内获得。我们还研究了可重复使用的MCO-PLC声催化剂和金属（锰和钴）在水介质中的浸出。通过电子顺磁共振和气相色谱-质谱分析，确定了超声降解土霉素的机理和降解过程中产生的碎片。
Degradation of contaminants of emerging concern in aqueous media using bimetallic oxides is a promising novel strategy that requires engineering new catalytic routes in bimetallic oxides to perform advanced oxidation; however, several challenges to synthesizing and developing such materials with enhanced, sustainable catalytic features are still being investigated. This study presents the effective use of a manganese cobaltite bimetallic spinel compound for sonocatalysis. We prepared three morphologies of manganese cobaltite for using in the sonocatalytic degradation of oxytetracycline (OTC). The morphology of manganese cobaltite was tuned by changing the amounts of the Mn and Co precursors in the early stage of synthesis. Several manganese cobaltite spinels with different structures-porous layered-like cubes (MCO-PLC), layered-like ellipsoids (MCO-LE), and rough spheroids (MCO-RS) were obtained and characterized using various techniques. A promising catalytic degradation capability of MCO-PLC for OTC (10.0 mg L-1) was obtained at a natural pH within 120 min. We also investigated the reusability of MCO-PLC sonocatalyst and metal (Mn and Co) leaching in water media. The sonocatalytic mechanisms and fragments produced from OTC during degradation were determined via electron paramagnetic resonance and gas chromatography-mass spectroscopy analyses.