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首页> 外文期刊>RSC Advances >Manganese oxide - an excellent microwave absorbent for the oxidation of methylene blue
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Manganese oxide - an excellent microwave absorbent for the oxidation of methylene blue

机译：氧化锰-一种出色的微波吸收剂，可氧化亚甲基蓝

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Microwave-induced oxidation is an effective method for degradation of organic pollutants with high concentrations in wastewater. In this study, manganese oxide (MO), a mixture of 74% akhtenskite and 26% ramsdellite was used as an oxidant for the microwave-induced oxidation of methylene blue (MB). With 0.1 g of MO and 2.5 mg of MB, the MB removal efficiency was about 99% under 10 min microwave irradiation (MI). The oxidative capacity of MO in this study was closely related to the concentration of H+. A strong acidic condition was optimal for MB degradation in the presence or absence of MI. The intermediates of MB degradation from C16H18N3S to C14H13N2OS, C13H11N2OS, and C12H9N2OS were identified by LC-MS. Network analysis described the excellent microwave adsorption property of MO which was mainly attributed to its dielectric loss. The maximal microwave reflection loss was about -21.23 dB for a sample that is made of 70% MO and 30% paraffin with a thickness of 6 mm. DOS calculation showed that the unit cell of akhtenskite with two manganese ions had the natural spin magnetic moment (2*Integrated Spin Density) of 6.0 which is in accordance with the theoretical calculation of two Mn4+ which could help the hysteresis loss under microwave irradiation. Considering the variable valence of MO and its zero electric dipole moment, it was deduced that charge transfer was the main mechanism for causing the dielectric loss.
机译：微波诱导氧化是降解废水中高浓度有机污染物的有效方法。在这项研究中，氧化锰（MO），74％的辉绿岩和26％的斜方锰矿的混合物用作氧化剂，用于微波诱导亚甲基蓝（MB）氧化。使用0.1 g的MO和2.5 mg的MB，在10分钟的微波辐射（MI）下，MB去除效率约为99％。在这项研究中，MO的氧化能力与H +的浓度密切相关。在存在或不存在MI的情况下，强酸性条件对于MB降解是最佳的。通过LC-MS鉴定了MB从C16H18N3S降解为C14H13N2OS，C13H11N2OS和C12H9N2OS的中间体。网络分析表明，MO具有优异的微波吸附性能，这主要归因于其介电损耗。对于由70％MO和30％石蜡制成，厚度为6 mm的样品，最大微波反射损耗约为-21.23 dB。 DOS计算表明，含两个锰离子的akhtenskite晶胞的自然自旋磁矩（2 *积分自旋密度）为6.0，这与两种Mn4 +的理论计算相符，这有助于减少微波辐射下的磁滞损耗。考虑到MO的化合价及其零电偶极矩，推论电荷转移是引起介电损耗的主要机理。

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