NaY沸石负载磁性MgFe2O4/CdS/MoS2三元纳米复合材料的构建及有机污染物的高效声催化降解,RSC Advances

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NaY沸石负载磁性MgFe2O4/CdS/MoS2三元纳米复合材料的构建及有机污染物的高效声催化降解
RSC Advances ( IF 3.9 ) Pub Date : 2020-12-11 , DOI: 10.1039/d0ra08831e
Meysam Sadeghi ₁ , Saeed Farhadi ₁ , Abedin Zabardasti ₁

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在这项工作中，通过超声辅助溶剂热法成功合成了新型可磁分离的NaY沸石/MgFe ₂ O ₄ /CdS纳米棒/MoS _{2纳米花纳米复合材料。}FESEM、EDAX、XRD、FTIR、TEM、AFM、VSM、N ₂ -BET、UV-vis DRS 和 PL 用于鉴定合成的纳米复合材料。随后，首次评估了该纳米复合材料在降解有机染料中的声催化活性，包括水溶液中的亚甲蓝（MB）、罗丹明B（RhB）和甲基橙（MO）。几个分析参数，如辐照时间、工艺类型、初始 MB 浓度、H ₂ O ₂对浓度、催化剂用量、有机染料类型和超声功率进行了系统研究，以获得最大的声催化产率。关于获得的数据，NaY/MgFe ₂ O ₄ /CdS NRs/MoS ₂ NFs 声催化剂通过使用 US/H ₂ O ₂系统能够完全消除 MB 。动力学评估表明 MB 的声降解反应遵循一阶模型。使用 US/H ₂ O ₂ /NaY/MgFe ₂获得的 MB 超声降解过程的表观速率常数 ( k _app ) 和半衰期 ( t _{1/2 )}O ₄ /CdS NRs/MoS ₂ NFs系统测得分别为1.162 min和0.596 min ^-1。˙OH 自由基也被认为是美国辐照下 MB 声降解过程中的主要活性氧。此外，NaY/MgFe ₂ O ₄ /CdS NRs/MoS ₂ NFs 声催化的可回收性研究结果清楚地表明，在多达四次连续运行中催化活性下降不到 6%。最后，提出并讨论了有机染料声降解反应的合理机制。

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Construction of magnetic MgFe2O4/CdS/MoS2 ternary nanocomposite supported on NaY zeolite and highly efficient sonocatalytic degradation of organic pollutants

In this work, the novel magnetically separable NaY zeolite/MgFe₂O₄/CdS nanorods/MoS₂ nanoflowers nanocomposite was successfully synthesized through the ultrasonic-assisted solvothermal approach. FESEM, EDAX, XRD, FTIR, TEM, AFM, VSM, N₂-BET, UV-vis DRS and PL were utilized to identify the as-synthesized nanocomposite. Subsequently, the sonocatalytic activity of this nanocomposite was assessed in the degradation of organic dyes, including methylene blue (MB), rhodamine B (RhB) and methyl orange (MO) from water solutions for the first time. Several analytical parameters like irradiation time, process type, initial MB concentration, H₂O₂ concentration, catalyst dosage, organic dye type, and US power have been systematically investigated to attain the maximum sonocatalytic yield. Regarding the acquired data, the NaY/MgFe₂O₄/CdS NRs/MoS₂ NFs sonocatalyst was incredibly able to completely eliminate the MB via engaging the US/H₂O₂ system. The kinetic evaluates demonstrated the sonodegradation reactions of the MB followed a first-order model. The apparent rate constant (k_app) and half-life time (t_1/2) acquired for the sonodegradation process of MB utilizing the US/H₂O₂/NaY/MgFe₂O₄/CdS NRs/MoS₂ NFs system were measured to be 1.162 min and 0.596 min⁻¹, respectively. The free ˙OH radicals were also recognized as the main reactive oxygen species in the MB sonodegradation process under US irradiation. In addition, the outcomes of the recyclability study of the NaY/MgFe₂O₄/CdS NRs/MoS₂ NFs sonocatalytic clearly displayed a less than 6% drop of the catalytic activity in up to four sequential runs. Lastly, a plausible mechanism for the sonodegradation reaction of organic dyes was suggested and discussed.

更新日期：2020-12-11

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