碱强度对光活性TiO2纳米线水热生长的影响

IF 1.4 Q4 NANOSCIENCE & NANOTECHNOLOGY
A. Hamisu, U. Gaya, A. Gaya
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引用次数: 1

摘要

在不同的氢氧化物存在下,通过碱-水热处理TiO2纳米颗粒制备了二氧化钛纳米线,并使用透射电子显微镜(TEM)、扫描电子显微镜(SEM)、能量色散x射线(EDX)、N2吸附-解吸测量、粉末x射线衍射(XRD)和UV-Vis光谱对其进行了表征。有趣的是,只有强碱(NaOH和KOH)主要形成锐钛矿型二氧化钛纳米线,具有明确的(110)金红石XRD峰的明显坍塌。KOH基氧化钛纳米线表现出相对较低的直径(~5 nm)、较高的表面积(228.34 m2/g)和较低的带隙能量(2.90 eV),并表现出最显著的光催化降解(98.87%)。然而,基于NH4OH的二氧化钛是具有不显著的改性形态和最低光催化效率的纳米颗粒。基于双变量中心复合物设计(CCD),采用响应面法研究了操作变量对所获得的碱-水热TiO2降解亚甲基蓝(MB)的影响,并进行了数值优化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of alkali strength on the hydrothermal growth of photoactive TiO2 nanowires
Titanium dioxide nanowires have been prepared by the alkali hydrothermal treatment of TiO2 nanoparticles in presence of different hydroxides and characterized using transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive x-ray (EDX), N2 adsorption-desorption measurements, powder x-ray diffraction (XRD) and UV-Vis spectroscopy. Interestingly, only the strong bases (NaOH and KOH) formed mainly anatase titanium dioxide nanowires with the evident collapse of definitive (110) rutile XRD peak. The KOH-based titanium oxide nanowires exhibited comparatively low diameter (∼5 nm), high surface area (228.34 m2/g), and low band gap energy (2.90 eV), and showed the most remarkable photocatalytic degradation (98.87 %). However, the NH4OH-based titanium dioxides were nanoparticles having insignificantly modified morphology and least photocatalytic efficiency. The effect of operating variables on the degradation of aqueous methylene blue (MB) over the obtained alkali hydrothermal TiO2 was studied using response surface methodology, based on a bivariate central composite design (CCD) and optimized numerically.
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来源期刊
Journal of Nanostructures
Journal of Nanostructures NANOSCIENCE & NANOTECHNOLOGY-
CiteScore
2.60
自引率
0.00%
发文量
0
审稿时长
7 weeks
期刊介绍: Journal of Nanostructures is a medium for global academics to exchange and disseminate their knowledge as well as the latest discoveries and advances in the science and engineering of nanostructured materials. Topics covered in the journal include, but are not limited to the following: Nanosystems for solar cell, energy, catalytic and environmental applications Quantum dots, nanocrystalline materials, nanoparticles, nanocomposites Characterization of nanostructures and size dependent properties Fullerenes, carbon nanotubes and graphene Self-assembly and molecular organization Super hydrophobic surface and material Synthesis of nanostructured materials Nanobiotechnology and nanomedicine Functionalization of nanostructures Nanomagnetics Nanosensors.
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