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Catalytic activation of peroxymonosulfate with manganese cobaltite nanoparticles for the degradation of organic dyes

机译：用锰钴钛矿纳米粒子催化激活锰钴酸盐纳米粒子的有机染料降解

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In this work, we report the facile hydrothermal synthesis of manganese cobaltite nanoparticles (MnCo _(2) O _(4.5) NPs) which can efficiently activate peroxymonosulfate (PMS) for the generation of sulfate free radicals (SO _(4) ˙ ~(?) ) and degradation of organic dyes. The synthesized MnCo _(2) O _(4.5) NPs have a polyhedral morphology with cubic spinel structure, homogeneously distributed Mn, Co, and O elements, and an average size less than 50 nm. As demonstrated, MnCo _(2) O _(4.5) NPs showed the highest catalytic activity among all tested catalysts (MnO _(2) , CoO) and outperformed other spinel-based catalysts for Methylene Blue (MB) degradation. The MB degradation efficiency reached 100% after 25 min of reaction under initial conditions of 500 mg L ~(?1) Oxone, 20 mg L ~(?1) MnCo _(2) O _(4.5) , 20 mg L ~(?1) MB, unadjusted pH, and T = 25 °C. MnCo _(2) O _(4.5) NPs showed a great catalytic activity in a wide pH range (3.5–11), catalyst dose (10–60 mg L ~(?1) ), Oxone concentration (300–1500 mg L ~(?1) ), MB concentration (5–40 mg L ~(?1) ), and temperature (25–55 °C). HCO _(3) ~(?) , CO _(3) ~(2?) and particularly Cl ~(?) coexisting anions were found to inhibit the catalytic activity of MnCo _(2) O _(4.5) NPs. Radical quenching experiments revealed that sulfate radicals are primarily responsible for MB degradation. A reaction sequence for the catalytic activation of PMS was proposed. The as-prepared MnCo _(2) O _(4.5) NPs could be reused for at least three consecutive cycles with small deterioration in their performance due to low metal leaching. This study suggests a facile route for synthesizing MnCo _(2) O _(4.5) NPs with high catalytic activity for PMS activation and efficient degradation of organic dyes.
机译：在这项工作中，我们报告了锰钴罐纳米粒子的容易水热合成（MNCO _（2）O _（4.5）NPS），其可以有效地激活过氧氧脲（PMS），用于产生硫酸盐自由基（如此_（4）˙〜 （？））和有机染料的降解。合成的MnCo _（2）O _（4.5）NPS具有与立方尖晶石结构，均匀分布的Mn，Co和O元素的多面体形态，平均尺寸小于50nm。如所示，MNCO _（2）O _（4.5）NPS在所有测试催化剂（MNO _（2），COO）中催化活性最高，并且对于亚甲基蓝（MB）降解而优于其他尖晶石的催化剂。在500mg L〜（α1）赭石的初始条件下25分钟的反应后Mb降解效率达到100％，20mg L〜（α1）MnCo _（2）O _（4.5），20mg L〜（ ？1）MB，不调整pH和T = 25°C。 MNCO _（2）O _（4.5）NPS在宽的pH范围内（3.5-11），催化剂剂量（10-60mg L〜（α1）），赭石浓度（300-1500mg l 〜（？1）），Mb浓度（5-40mg L〜（α1））和温度（25-55°C）。 HCO _（3）〜（？），CO _（3）〜（2？），特别是Cl〜（？）共存阴离子抑制MnCo _（2）O _（4.5）NPS的催化活性。根本淬火实验表明，硫酸盐自由基主要负责MB降解。提出了对PMS催化活化的反应序列。可以重复制备的MNCO _（2）O _（4.5）NPS至少三个连续三个循环，由于低金属浸出，它们的性能劣化。该研究表明，用于合成具有高催化活性的MnCo _（2）O _（4.5）NPS的容易路径，用于PMS活化和有效降解有机染料。

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