Simultaneous Cr(VI) reduction and Cr(III) removal of bifunctional MOF/Titanate nanotube composites

Xun Wang; Wen Liu; Huifen Fu; Xiao-Hong Yi; Peng Wang; Chen Zhao; Chong-Chen Wang; Weiwei Zheng

doi:10.1016/j.envpol.2019.03.096

Simultaneous Cr(VI) reduction and Cr(III) removal of bifunctional MOF/Titanate nanotube composites

Environ Pollut. 2019 Jun:249:502-511. doi: 10.1016/j.envpol.2019.03.096. Epub 2019 Mar 25.

Authors

Xun Wang¹, Wen Liu², Huifen Fu¹, Xiao-Hong Yi¹, Peng Wang¹, Chen Zhao¹, Chong-Chen Wang³, Weiwei Zheng⁴

Affiliations

¹ Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation/Beijing Advanced Innovation Centre for Future Urban Design, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
² The Key Laboratory of Water and Sediment Sciences, Ministry of Education, College of Environment Sciences and Engineering, Peking University, Beijing 100871, China.
³ Beijing Key Laboratory of Functional Materials for Building Structure and Environment Remediation/Beijing Advanced Innovation Centre for Future Urban Design, Beijing University of Civil Engineering and Architecture, Beijing 100044, China. Electronic address: wangchongchen@bucea.edu.cn.
⁴ Department of Chemistry, Syracuse University, Syracuse, NY 13244, United States.

PMID: 30928522
DOI: 10.1016/j.envpol.2019.03.096

Abstract

In this study, a series of BUC-21/titanate nanotube (BT-X) composites were facilely fabricated via ball-milling of 2-dimensional (2D) metal-organic framework (MOF) BUC-21 and titanate nanotubes (TNTs). The BT-X composites were characterized by powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), UV-visible diffuse-reflectance spectroscopy (UV-vis DRS), X-ray photoelectron spectrometer (XPS) and high resolution transmission electron microscopy (HRTEM). Both the photocatalytic reduction from Cr(VI) to Cr(III) and adsorptive removal of formed Cr(III) of BT-X composites were systematically investigated under different conditions including pH values and co-existing inorganic ions. It was found that BUC-21 (100 mg)/TNTs (100 mg) (BT-1) composites demonstrate remarkable ability of photocatalytic Cr(VI) reduction and adsorptive Cr(III) removal, as well as good reusability and stability. It is believed that the introduction of TNTs could capture the formed Cr(III) from the surface of BUC-21, which provided more active sites exposed to enhance the Cr(VI) reduction.

Keywords: Adsorption; BUC-21; Chromium; Photocatalysis; Titanate nanotubes.

MeSH terms

Adsorption
Catalysis
Chromium / chemistry*
Environmental Restoration and Remediation / methods*
Metals, Heavy / chemistry
Microscopy, Electron, Transmission
Nanotubes / chemistry*
Oxidation-Reduction
Photoelectron Spectroscopy
Spectroscopy, Fourier Transform Infrared
Titanium / chemistry*
X-Ray Diffraction

Substances

Metals, Heavy
Chromium
titanium dioxide
chromium hexavalent ion
Titanium