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Photocatalytic Degradation of Methylene Blue by Using ZnO/Longan Seed Activated Carbon Under Visible-Light Region
Journal of Inorganic and Organometallic Polymers and Materials ( IF 3.9 ) Pub Date : 2020-09-05 , DOI: 10.1007/s10904-020-01734-z
Nguyen Van Hung , Bui Thi Minh Nguyet , Nguyen Huu Nghi , Dinh Quang Khieu

In the present study, the synthesis of zinc oxide/longan seed activated carbon material (ZnO/LSAC) and its photocatalytic activity under the visible-light region are demonstrated. The pyrolysis of the carbonized material prepared from longan seeds and zinc acetate in the alkaline medium was conducted to manufacture ZnO/LSAC. The obtained material was characterized by using X-ray diffraction, Fourier transformation-infrared spectroscopy, high-resolution transmission electron microscopy, energy-dispersive X-ray elemental mapping observation, nitrogen adsorption/desorption isotherms, ultraviolet-diffusive reflectance spectroscopy (DRS–UV–Vis), and photoluminescence spectra. The ZnO nanoparticles with 20–30 nm in diameter are highly dispersed on the LSAC matrix. The combination of ZnO with LSAC promotes visible-light absorption. The photocatalytic activities of the prepared composite were evaluated for the degradation of methylene blue (MB) under visible-light irradiation. The kinetics and mechanism for photodegradation were addressed. The kinetic data and equilibrium data fit the modified Langmuir–Hinshelwood model. Introducing C to ZnO lattice creates an intermediate energy level and narrows the absorption energy, which results in the visible-light-driven photocatalytic activity of ZnO/LSAC. Reusability studies show that the catalyst retains its original activity even after the third cycle of reuse. Besides MB, the present catalyst could catalyze the photodegradation of other dyes, such as rhodamine B, congo red, and methyl orange.



中文翻译:

可见光区ZnO /龙眼籽活性炭对亚甲基蓝的光催化降解

在本研究中,证明了氧化锌/龙眼籽活性炭材料(ZnO / LSAC)的合成及其在可见光区的光催化活性。在碱性介质中,对由龙眼籽和乙酸锌制得的碳化材料进行了热解,从而制得了ZnO / LSAC。所得材料的特征在于使用X射线衍射,傅立叶变换红外光谱,高分辨率透射电子显微镜,能量色散X射线元素图观察,氮吸附/解吸等温线,紫外扩散反射光谱(DRS–UV) –Vis)和光致发光光谱。直径为20–30 nm的ZnO纳米颗粒高度分散在LSAC基质上。ZnO与LSAC的组合可促进可见光吸收。评价了制备的复合材料的光催化活性,以观察其在可见光照射下的亚甲基蓝(MB)的降解。解决了动力学和光降解机理。动力学数据和平衡数据符合改进的Langmuir-Hinshelwood模型。将C引入ZnO晶格会产生中等能级,并使吸收能变窄,从而导致可见光驱动的ZnO / LSAC光催化活性。可重复使用性研究表明,即使在第三次重复使用之后,催化剂仍保持其原始活性。除MB外,本发明的催化剂还可以催化其他染料的光降解,如若丹明B,刚果红和甲基橙。解决了动力学和光降解机理。动力学数据和平衡数据符合改进的Langmuir-Hinshelwood模型。将C引入ZnO晶格会产生中等能级,并使吸收能变窄,从而导致可见光驱动的ZnO / LSAC光催化活性。可重复使用性研究表明,即使在第三次重复使用之后,催化剂仍保持其原始活性。除MB外,本发明的催化剂还可以催化其他染料的光降解,如若丹明B,刚果红和甲基橙。解决了动力学和光降解机理。动力学数据和平衡数据符合改进的Langmuir-Hinshelwood模型。将C引入ZnO晶格会产生中等能级,并使吸收能变窄,从而导致可见光驱动的ZnO / LSAC光催化活性。可重复使用性研究表明,即使在第三次重复使用之后,催化剂仍保持其原始活性。除MB外,本发明的催化剂还可以催化其他染料的光降解,如若丹明B,刚果红和甲基橙。导致可见光驱动的ZnO / LSAC光催化活性。可重复使用性研究表明,即使在第三次重复使用之后,催化剂仍保持其原始活性。除MB外,本发明的催化剂还可以催化其他染料的光降解,如若丹明B,刚果红和甲基橙。导致可见光驱动的ZnO / LSAC光催化活性。可重复使用性研究表明,即使在第三次重复使用之后,催化剂仍保持其原始活性。除MB外,本发明的催化剂还可以催化其他染料的光降解,如若丹明B,刚果红和甲基橙。

更新日期:2020-09-07
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