fulltext.study @t Gmail

Enhancement of the Cr(VI) adsorption and photocatalytic reduction activity of g-C3N4 by hydrothermal treatment in HNO3 aqueous solution

Paper ID Volume ID Publish Year Pages File Format Full-Text
38786 45791 2016 10 PDF Available
Title
Enhancement of the Cr(VI) adsorption and photocatalytic reduction activity of g-C3N4 by hydrothermal treatment in HNO3 aqueous solution
Abstract

•Hydrothermal treatment in HNO3 aqueous solution is adopted to modify g-C3N4.•Treated g-C3N4 exhibits enhanced adsorption and photocatalytic reduction of Cr(VI).•Hydrothermal treatment conditions affect the structure and performance of g-C3N4.•Reasons for improved performance of treated g-C3N4 are discussed.•Different photocatalytic Cr(VI) reduction mechanisms over g-C3N4 and treated g-C3N4.

An effective and environmental-friendly method was adopted to enhance the Cr(VI) adsorption and photocatalytic reduction activity of g-C3N4, which was prepared by thermal condensation of melamine. The enhancement was realized by hydrothermal treatment of g-C3N4 in 1.9–7.6 mol/L HNO3 aqueous solutions at 80–120 °C for 3–12 h. The compositions, structures and physiochemical properties of the hydrothermally treated g-C3N4 were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, N2 adsorption/desorption isotherms, Zeta potential analysis, UV–vis diffuse reflectance spectroscopy and photocurrent measurement, and their dark adsorption and visible-light (wavelength >420 nm)-driven photocatalytic reduction of Cr(VI) in aqueous solution were tested. It was found that the hydrothermally treated g-C3N4 exhibited significantly enhanced Cr(VI) adsorption and photocatalytic reduction activity than g-C3N4. Moreover, larger concentration of HNO3 aqueous solution, higher hydrothermal temperature or longer treatment time resulted in higher Cr(VI) adsorption and photocatalytic reduction activity of the hydrothermally treated g-C3N4. The reasons accounting for the enhanced Cr(VI) adsorption and photocatalytic reduction activity of the hydrothermally treated g-C3N4 were discussed, and the different mechanisms for the photocatalytic reduction of Cr(VI) over g-C3N4 and the hydrothermally treated g-C3N4 were also proposed.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (134 K)Download as PowerPoint slide

Keywords
Graphitic carbon nitride; Hydrothermal treatment; Adsorption; Photocatalytic reduction; Hexavalent chromium
First Page Preview
Enhancement of the Cr(VI) adsorption and photocatalytic reduction activity of g-C3N4 by hydrothermal treatment in HNO3 aqueous solution
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 521, 5 July 2016, Pages 9–18
Authors
, , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us