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一步合成OH-TiO/TiOF纳米杂化物及其增强的太阳光光催化性能。

One-step synthesis of OH-TiO/TiOF nanohybrids and their enhanced solar light photocatalytic performance.

作者信息

Hou Chentao, Liu Wenli

机构信息

College of Geology and Environment, Xi'an University of Science and Technology, Xi'an 710054, People's Republic of China.

出版信息

R Soc Open Sci. 2018 Jun 6;5(6):172005. doi: 10.1098/rsos.172005. eCollection 2018 Jun.

DOI:10.1098/rsos.172005
PMID:30110486
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6030343/
Abstract

TiO/TiOF nanohybrids were quickly synthesized through a hydrothermal process using titanium n-butoxide (TBOT), ethanol (CHOH) and hydrofluoric acid as precursors. The prepared nanohybrids underwent additional NaOH treatment (OH-TiO/TiOF) to enhance their photocatalytic performance. In this paper, the mechanism of NaOH affecting the pathway of transformation from TBOT (Ti precursor) to TiO nanosheets was discussed. The synthesized TiO/TiOF and OH-TiO/TiOF were characterized by field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction pattern (XRD), Fourier infrared spectroscopic analysis (FT-IR), Photoluminescence (PL) emission spectra and UV-visible diffuse reflection spectra (UV-vis DRS). The photocatalytic activity and stability of synthesized samples were evaluated by degradation of methylene blue (MB) under the simulated solar light. The results showed that a larger ratio of TiO to TiOF in TiO/TiOF and OH-TiO/TiOF nanohybrids could allow for even higher MB conversion compared with only TiO nanosheets. NaOH treatment can wash off the F ions from TiOF and induce this larger ratio. The highest efficiency of MB removal was just above 90% in 1 h. Lower electron-hole pairs recombination rate is the dominant factor that induces the photocatalytic performance enhancement of TiO/TiOF nanohybrids. The synthesized OH-TiO/TiOF nanohybrids exhibit great potential in the abatement of organic pollutants.

摘要

通过水热法,以正丁醇钛(TBOT)、乙醇(CHOH)和氢氟酸为前驱体,快速合成了TiO/TiOF纳米杂化物。对制备的纳米杂化物进行额外的NaOH处理(OH-TiO/TiOF)以提高其光催化性能。本文讨论了NaOH影响从TBOT(Ti前驱体)到TiO纳米片转变途径的机制。通过场发射扫描电子显微镜(FE-SEM)、高分辨率透射电子显微镜(HRTEM)、X射线衍射图谱(XRD)、傅里叶红外光谱分析(FT-IR)、光致发光(PL)发射光谱和紫外可见漫反射光谱(UV-vis DRS)对合成的TiO/TiOF和OH-TiO/TiOF进行了表征。通过在模拟太阳光下降解亚甲基蓝(MB)来评估合成样品的光催化活性和稳定性。结果表明,与仅TiO纳米片相比,TiO/TiOF和OH-TiO/TiOF纳米杂化物中TiO与TiOF的比例更大,可实现更高的MB转化率。NaOH处理可以洗去TiOF中的F离子并诱导形成更大的比例。MB去除的最高效率在1小时内略高于90%。较低的电子-空穴对复合率是导致TiO/TiOF纳米杂化物光催化性能增强的主要因素。合成的OH-TiO/TiOF纳米杂化物在有机污染物减排方面具有巨大潜力。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/db09/6030343/16acbcf8cf9b/rsos172005-g11.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/db09/6030343/25b1fdf1a33e/rsos172005-g7.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/db09/6030343/626f17fb5cad/rsos172005-g9.jpg
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