AgInS2-ZnS量子点/TiO2纳米复合材料降解亚甲基蓝的合成

IF 2.5 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Nomfundo Ruth Lushaba, S. Parani, Rodney Maluleke, Gracia it Mwad Mbaz, O. Oluwafemi
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引用次数: 0

摘要

光催化降解已被证明是一种高效、环保的去除染料污染物的方法。本文报道了谷胱甘肽(GSH)包封的AgInS2-ZnS (AIS-ZnS)核壳量子点(QDs)与二氧化钛(TiO2)作为一种新型纳米复合材料的协同作用,用于亚甲基蓝(MB)的高效光催化处理。在水介质中直接合成了AIS-ZnS核壳量子点和相应的量子点/TiO2纳米复合材料。AIS-ZnS核壳量子点的光学性质表现为强黄色光致发光,随TiO2的加入逐渐减弱。傅里叶变换红外光谱(FTIR)证实了GSH在量子点和纳米复合材料上的封盖作用。x射线衍射和透射电子显微镜显示了合成材料的纳米晶性质和形状,并显示了退火后TiO2粒子上的量子点(3.9 nm)的集成。然后研究了这些材料在可见光照射下作为光催化剂降解MB。研究了催化剂中TiO2含量、煅烧程度、光照射时间、催化剂剂量、初始MB浓度等因素对MB光降解的影响。结果表明,与AIS-ZnS QD和TiO2相比,AIS-ZnS QD/TiO2纳米复合材料具有更好的光降解性能。TiO2浓度的增加也提高了纳米复合材料对MB的降解效率(可达99%)。MB降解动力学遵循准一阶过程。制备的AIS-ZnS QD/TiO2纳米复合材料可作为一种高效、环保的光催化剂降解MB。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Synthesis of AgInS2-ZnS quantum dot/TiO2 nanocomposites as efficient photocatalysts for methylene blue degradation
Photocatalytic degradation has been demonstrated to be an efficient and eco-friendly method for the removal of dye pollutants. Herein, we report the synergetic effect of glutathione (GSH)-capped AgInS2-ZnS (AIS-ZnS) core–shell quantum dots (QDs) and titanium dioxide (TiO2) as a novel nanocomposite for the efficient photocatalytic treatment of methylene blue (MB). The AIS-ZnS core–shell QDs and the corresponding QD/TiO2 nanocomposites were synthesized directly in an aqueous medium followed by annealing. The optical properties of the AIS-ZnS core–shell QDs showed strong yellow photoluminescence, which decreased gradually with the addition of TiO2. Fourier transform infrared (FTIR) spectroscopy confirmed the GSH capping on the QDs and nanocomposites. X-ray diffraction and transmission electron microscopy revealed the nanocrystalline nature and shape of the as-synthesized materials and showed the integration of the QDs (3.9 nm) on the TiO2 particles after annealing. These materials were then investigated as a photocatalyst for MB degradation using visible light irradiation. The effect of TiO2 content in the catalyst, calcination, photoirradiation period, catalyst dose, and initial MB concentration on photodegradation of MB was studied. The results indicated that the AIS-ZnS QD/TiO2 nanocomposite exhibited better photodegradation performance compared to AIS-ZnS QDs and TiO2. The increasing TiO2 concentration in the nanocomposite also enhanced MB degradation efficiency (up to 99%). The kinetics of MB degradation follows a pseudo-first-order process. The prepared AIS-ZnS QD/TiO2 nanocomposite would serve as an effective and eco-friendly photocatalyst for MB degradation.
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来源期刊
Nano Futures
Nano Futures Chemistry-General Chemistry
CiteScore
4.30
自引率
0.00%
发文量
35
期刊介绍: Nano Futures mission is to reflect the diverse and multidisciplinary field of nanoscience and nanotechnology that now brings together researchers from across physics, chemistry, biomedicine, materials science, engineering and industry.
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