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首页> 外文期刊>Desalination and water treatment >Sonocatalytic degradation of organic pollutants by CdS nanoparticles hydrothermally prepared from cadmium(Ⅱ) diethanoldithiocarbamate
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Sonocatalytic degradation of organic pollutants by CdS nanoparticles hydrothermally prepared from cadmium(Ⅱ) diethanoldithiocarbamate

机译：二乙醇二硫代氨基甲酸镉（Ⅱ）水热制备CdS纳米粒子声催化降解有机污染物

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摘要

In this work, CdS nanoparticles were prepared by hydrothermal decomposition of cadmium(II) diethanoldithiocarbamate (Cd(DEDTC)(2)) precursor at 200 degrees C and were used as a novel sonocatalyst for H2O2-assisted degradation of three organic dye pollutants including methylene blue (MB), Rhodamine B (RhB) and methyl orange (MO). This sonocatalyst was characterized using FT-IR, XRD, SEM, UV-Vis and EDX analysis which all of them confirmed the formation of high pure CdS nanoparticles with an average particle size of 20 nm. The optical absorption spectrum of CdS nanoparticles showed the band gap of 2.3 eV suitable for sonophotocatalytic degradation of organic pollutants. Under the optimized conditions, about 93% of RhB, 87% of MB and 55% of MO were degraded with the rate constants of 0.019, 0.014, and 0.0 04 min(-1), respectively. It was demonstrated that the sonocatalytic activity of CdS/ultrasound system was depended on CdS dosage, H2O2 concentration and initial dye concentration. The trapping experiments indicated that. OH radicals were the main reactive species for dye degradation. In addition, the catalyst can be reused without significant loss of activity and its structure was not affected by the reactants or ultrasound.
机译：在这项工作中，CdS纳米粒子是通过在200摄氏度下水热分解二乙醇二硫代氨基甲酸镉（Cd（DEDTC）（2））前驱体制备的，并被用作新型的声催化剂，用于H2O2辅助降解包括亚甲基在内的三种有机染料污染物蓝色（MB），若丹明B（RhB）和甲基橙（MO）。使用FT-IR，XRD，SEM，UV-Vis和EDX分析对这种声催化剂进行了表征，所有这些都证实了平均粒径为20 nm的高纯CdS纳米颗粒的形成。 CdS纳米粒子的光吸收光谱表明，该带隙为2.3 eV，适用于声光催化降解有机污染物。在优化的条件下，降解率分别为约93％，87％MB和55％MO，速率常数分别为0.019、0.014和0.0 04 min（-1）。结果表明，CdS /超声系统的声催化活性取决于CdS用量，H2O2浓度和初始染料浓度。诱捕实验表明。 OH自由基是染料降解的主要反应物种。另外，该催化剂可以重复使用而没有明显的活性损失，并且其结构不受反应物或超声的影响。

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