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Acta Chimica Sinica >

2019 , Vol. 77 >Issue 5: 461 - 468

DOI: https://doi.org/10.6023/A18120503

Article

Preparation and Photocatalytic Activity of BiOCl-ov/palygorskite Nanocomposites for the Selective Oxidation of Alcohols under Visible Light Irradiation

  • Meng Shuangyan ,
  • Yang Hongju ,
  • Zhu Nan ,
  • Yang Jiao ,
  • Yang Ruirui ,
  • Yang Zhiwang
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  • College of Chemistry and Chemical Engineering, Northwest Normal University Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education Key Laboratory of Polymer Materials of Gansu Province, Lanzhou 730070

Received date: 2018-12-17

  Online published: 2019-04-09

Supported by

Project supported by the National Natural Science Foundation of China (No. 21563026), the Program for Changjiang Scholars and Innovative Research Team in University (No. IRT15R56), and the Innovation Team Basic Scientific Research Project of Gansu Province (No. 1606RJIA324).

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Abstract

A series of BiOCl-ov/palygorskite (PGS) nanocomposites (abbreviated as x B/P, where x is the molar content of BiOCl-ov in the composites) were synthesized by simple one-step hydrothermal method. The structure, morphology and photoelectrochemical properties of the nanocomposites have been thoroughly characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), N2 adsorption-desorption, Fourier infrared spectroscopy (FT-IR), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), fluorescence spectroscopy (PL) and electrochemical impedance (EIS) spectra. As a typical rodlike natural mineral, PGS was commonly used as absorbent in many fields. Its photocatalytic properties was always ascribed to the defects in its crystal lattice after the acidic treatment, which would give contribution to the photoinduced electron conductions in its bulky nanoparticles. On the other hand, as a typical layered p-typed semiconductor, BiOCl-ov was widely used in many oxidations due to the many of oxygen vacancies existed in its nanostructure. The combination of rodlike PGS and layered BiOCl-ov could be successfully carried out through the formation of the nanocomposites due to their respective crystal structure as well as their catalytic activity. So the BiOCl-ov/PGS nanocomposites were well prepared according to the advantages of PGS and BiOCl-ov. With the carefully investigation of the structure of the nanocomposites, the results showed that the catalysts were successfully prepared. The structures of BiOCl-ov and PGS were all well remained after the preparing process. The photocatalytic activity of the prepared BiOCl-ov/PGS was detected through the selective oxidation of aromatic alcohols under visible-light conditions. It found that BiOCl-ov/PGS showed promising activity for the photocatalytic oxidation of alcohols under the irradiation of visible light. The conversion of 78% of benzalcohol as well as the selectivity of 86% of benzaldehyde was reached with the catalysis of the nanocomposites in the photocatalytic oxidation of benzalcohol. Some of the other substrates, including the derivatives of benzalcohol as well as diphenylmethanol could be well oxidized. Moreover, the nonaromatic substrate, that is, phenethyl alcohol, it was always thought to be not easy to be oxidized one, could also be oxidized to corresponding phenylacetaldehyde with high conversion (89%) and selectivity (99%). Meanwhile, the catalyst possessed well light stability. The photocatalytic mechanism of the oxidation was also investigated through the active species capturing experiments. It showed that the major active species of the oxidation system was ·O2- and ·OH radicals.

Key words： palygorskite; BiOCl-ov; visible light catalysis; aromatic alcohol; selective oxidation

Cite this article

Meng Shuangyan , Yang Hongju , Zhu Nan , Yang Jiao , Yang Ruirui , Yang Zhiwang . Preparation and Photocatalytic Activity of BiOCl-ov/palygorskite Nanocomposites for the Selective Oxidation of Alcohols under Visible Light Irradiation[J]. Acta Chimica Sinica, 2019 , 77(5) : 461 -468 . DOI: 10.6023/A18120503

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