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Remarkable catalytic degradation of malachite green by zinc supported on hydroxyapatite encapsulated magnesium ferrite (Zn/HAP/MgFe2O4) magnetic novel nanocomposite
Journal of Materials Science ( IF 4.5 ) Pub Date : 2019-12-17 , DOI: 10.1007/s10853-019-04294-x
Krishna Ch. Das , Siddhartha S. Dhar

The present study reports the synthesis, characterization and catalytic activity of zinc/hydroxyapatite/magnesium ferrite (Zn/HAP/MgFe2O4) as a novel nanocomposite. The nanocomposite was characterized by powder XRD, FTIR, SEM–EDX, TEM, VSM and XPS. The presence of Zn(0) and Zn(II) in the Zn/HAP/MgFe2O4 was confirmed by XPS studies. The composite was applied as a heterogeneous catalyst for the degradation of malachite green in the presence as well as in the absence of H2O2. In the presence of the oxidant H2O2, 100% degradation was achieved in just 2 min while in the absence of H2O2 it took almost 2 h for complete degradation. The enhancement in the rate of the degradation of the dye in the presence of H2O2 was due to fenton and fenton-like mechanism involving the formation of reactive oxygen species, such as hydroxyl and perhydroxyl radicals (HO· and HOO·). The Zn/HAP/MgFe2O4 showed high stability and because of its super-paramagnetic behaviour it could be easily separated by external magnet from the reaction mixture. Kinetic studies showed that the degradation of the dye follows first order.

中文翻译:

羟基磷灰石包封的镁铁氧体(Zn/HAP/MgFe2O4)磁性新型纳米复合材料负载锌对孔雀石绿的显着催化降解

本研究报告了作为新型纳米复合材料的锌/羟基磷灰石/镁铁氧体 (Zn/HAP/MgFe2O4) 的合成、表征和催化活性。通过粉末 XRD、FTIR、SEM-EDX、TEM、VSM 和 XPS 对纳米复合材料进行表征。XPS 研究证实了 Zn/HAP/MgFe2O4 中存在 Zn(0) 和 Zn(II)。该复合材料用作非均相催化剂,用于在 H2O2 存在和不存在下降解孔雀石绿。在氧化剂 H2O2 的存在下,100% 降解仅在 2 分钟内实现,而在没有 H2O2 的情况下,完全降解需要近 2 小时。在 H2O2 存在下染料降解速率的提高是由于芬顿和类似芬顿的机制,包括活性氧的形成,例如羟基和过羟基自由基(HO·和 HOO·)。Zn/HAP/MgFe2O4 表现出高稳定性,并且由于其超顺磁行为,它可以很容易地通过外部磁铁从反应混合物中分离。动力学研究表明染料的降解遵循一阶。
更新日期:2019-12-17
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