In this paper, with the aim of using the solar light as an unlimited and clean source of energy, novel magnetic MgAlO-AC nanophotocatalysts with different mass percentages of activated carbon were synthesized for water purification applications. In order to synthesize the magnetic MgAlO-AC nanophotocatalysts, three different methods of combustion, sono-impregnation, and sono-solvothermal were used at different stages. Different analyses such as XRD, FESEM, TEM, EDX, BET-BJH, FTIR, DRS, PL, pHpzc, and VSM were performed to evaluate the structural, chemical and optical properties of the prepared samples. For example, BET-BJH analysis results showed that bare MgAlO had low specific surface area, pore volume and pore diameter that they would impede the entry and absorption of dye molecules. While MgAlO(90)-AC(10)(Mag) sample, due to the presence of carbon active had high specific surface area, large pore volume and pore diameter. Also, DRS analysis represented that MgAlO(90)-AC(10)(Mag) had narrower band gap energy compared to bare MgAlO. PL analysis results also revealed the decreased recombination rate of the excited electron-hole pairs in MgAlO(90)-AC(10)(Mag), due to the presence of activated carbon. Moreover, the prepared samples were examined in the solar-light-driven degradation of organic dyes. The tremendous enhanced photocatalytic activity under the simulated solar light with 96% removal of MB was observed over MgAlO(90)-AC(10)(Mag). It also degraded 80 and 70% of EY and AO7, respectively, indicating its ability to the removal of a wide range of organic dyes. Then, the effect of initial solution pH as one of the important factors on photocatalytic activity, the reusability of the best sample and its reaction kinetic were investigated. At last, MB degradation mechanism over MgAlO(90)-AC(10)(Mag) was proposed.

中文翻译：

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增强型模拟阳光驱动磁性 MgAl2O4-AC 纳米光催化剂可有效降解有机染料


在本文中，为了利用太阳光作为一种无限的清洁能源，合成了具有不同活性炭质量百分比的新型磁性MgAl2O-AC纳米光催化剂，用于水净化应用。为了合成磁性 MgAl2O-AC 纳米光催化剂，在不同阶段使用了燃烧、声浸渍和声溶剂热三种不同的方法。通过 XRD、FESEM、TEM、EDX、BET-BJH、FTIR、DRS、PL、pHpzc 和 VSM 等不同分析来评估所制备样品的结构、化学和光学性质。例如，BET-BJH分析结果表明，裸露的MgAl2O具有较低的比表面积、孔体积和孔径，它们会阻碍染料分子的进入和吸收。而MgAlO(90)-AC(10)(Mag)样品由于活性炭的存在而具有较高的比表面积、较大的孔体积和孔径。此外，DRS 分析表明 MgAlO(90)-AC(10)(Mag) 与裸露的 MgAlO 相比具有更窄的带隙能量。 PL分析结果还表明，由于活性炭的存在，MgAlO(90)-AC(10)(Mag)中激发的电子-空穴对的复合率降低。此外，还检查了制备的样品在太阳光驱动的有机染料降解中的情况。与 MgAlO(90)-AC(10)(Mag) 相比，在模拟太阳光下光催化活性显着增强，MB 去除率达到 96%。它还分别降解了 80% 和 70% 的 EY 和 AO7，表明其能够去除多种有机染料。然后，研究了初始溶液pH作为重要因素之一对光催化活性的影响、最佳样品的可重复使用性及其反应动力学。 最后提出了MgAlO(90)-AC(10)(Mag)的MB降解机理。