Details
| Original language | English |
|---|---|
| Article number | 1027 |
| Journal | MATERIALS |
| Volume | 12 |
| Issue number | 7 |
| Early online date | 28 Mar 2019 |
| Publication status | Published - Apr 2019 |
Abstract
Microcystin-LR (MC-LR), a potent hepatotoxin produced by the cyanobacteria, is of increasing concern worldwide because of severe and persistent impacts on humans and animals by inhalation and consumption of contaminated waters and food. In this work, MC-LR was removed completely from aqueous solution using visible-light-active C/N-co-modified mesoporous anatase/brookite TiO 2 photocatalyst. The co-modified TiO 2 nanoparticles were synthesized by a one-pot hydrothermal process, and then calcined at different temperatures (300, 400, and 500 °C). All the obtained TiO 2 powders were analyzed by X-ray diffraction (XRD), Raman spectroscopy, transmission electron microscope (TEM), specific surface area (SSA) measurements, ultraviolet-visible diffuse reflectance spectra (UV-vis DRS), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) spectroscopy, and photoluminescence (PL) analysis. It was found that all samples contained mixed-phase TiO 2 (anatase and brookite), and the content of brookite decreased with an increase in calcination temperature, as well as the specific surface area and the content of non-metal elements. The effects of initial pH value, the TiO 2 content, and MC-LR concentration on the photocatalytic activity were also studied. It was found that the photocatalytic activity of the obtained TiO 2 photocatalysts declined with increasing temperature. The complete degradation (100%) of MC-LR (10 mg L -1) was observed within 3 h, using as-synthesized co-modified TiO 2 (0.4 g L -1) at pH 4 under visible light. Based on the obtained results, the mechanism of MC-LR degradation has been proposed.
Keywords
- Anatase, Brookite, C/N-TiO, Microcystin-LR, Photodegradation, Visible light
ASJC Scopus subject areas
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In: MATERIALS, Vol. 12, No. 7, 1027, 04.2019.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Photodegradation of Microcystin-LR Using Visible Light-Activated C/N-co-Modified Mesoporous TiO2 Photocatalyst
AU - Khedr, Tamer M.
AU - El-Sheikh, Said
AU - Ismail, Adel A.
AU - Kowalska, Ewa
AU - Bahnemann, Detlef Bahnemann Detlef
N1 - Funding Information: T.M. Khedr acknowledges Institute of Technical Chemistry, Photocatalysis and Nanotechnology Research Unit, Leibniz Universität Hannover, Germany for hosting him during this research work. This work was supported by the Egyptian Ministry of Higher Education (Cultural Affairs and Missions Sector). A part of this work was also supported by US-Egypt Joint project Cycle 17 no. 229 and short-term fellowship Cycle 6, Science & Technological Development Fund in Egypt (STDF-STF) under Grant No. 25503.
PY - 2019/4
Y1 - 2019/4
N2 - Microcystin-LR (MC-LR), a potent hepatotoxin produced by the cyanobacteria, is of increasing concern worldwide because of severe and persistent impacts on humans and animals by inhalation and consumption of contaminated waters and food. In this work, MC-LR was removed completely from aqueous solution using visible-light-active C/N-co-modified mesoporous anatase/brookite TiO 2 photocatalyst. The co-modified TiO 2 nanoparticles were synthesized by a one-pot hydrothermal process, and then calcined at different temperatures (300, 400, and 500 °C). All the obtained TiO 2 powders were analyzed by X-ray diffraction (XRD), Raman spectroscopy, transmission electron microscope (TEM), specific surface area (SSA) measurements, ultraviolet-visible diffuse reflectance spectra (UV-vis DRS), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) spectroscopy, and photoluminescence (PL) analysis. It was found that all samples contained mixed-phase TiO 2 (anatase and brookite), and the content of brookite decreased with an increase in calcination temperature, as well as the specific surface area and the content of non-metal elements. The effects of initial pH value, the TiO 2 content, and MC-LR concentration on the photocatalytic activity were also studied. It was found that the photocatalytic activity of the obtained TiO 2 photocatalysts declined with increasing temperature. The complete degradation (100%) of MC-LR (10 mg L -1) was observed within 3 h, using as-synthesized co-modified TiO 2 (0.4 g L -1) at pH 4 under visible light. Based on the obtained results, the mechanism of MC-LR degradation has been proposed.
AB - Microcystin-LR (MC-LR), a potent hepatotoxin produced by the cyanobacteria, is of increasing concern worldwide because of severe and persistent impacts on humans and animals by inhalation and consumption of contaminated waters and food. In this work, MC-LR was removed completely from aqueous solution using visible-light-active C/N-co-modified mesoporous anatase/brookite TiO 2 photocatalyst. The co-modified TiO 2 nanoparticles were synthesized by a one-pot hydrothermal process, and then calcined at different temperatures (300, 400, and 500 °C). All the obtained TiO 2 powders were analyzed by X-ray diffraction (XRD), Raman spectroscopy, transmission electron microscope (TEM), specific surface area (SSA) measurements, ultraviolet-visible diffuse reflectance spectra (UV-vis DRS), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) spectroscopy, and photoluminescence (PL) analysis. It was found that all samples contained mixed-phase TiO 2 (anatase and brookite), and the content of brookite decreased with an increase in calcination temperature, as well as the specific surface area and the content of non-metal elements. The effects of initial pH value, the TiO 2 content, and MC-LR concentration on the photocatalytic activity were also studied. It was found that the photocatalytic activity of the obtained TiO 2 photocatalysts declined with increasing temperature. The complete degradation (100%) of MC-LR (10 mg L -1) was observed within 3 h, using as-synthesized co-modified TiO 2 (0.4 g L -1) at pH 4 under visible light. Based on the obtained results, the mechanism of MC-LR degradation has been proposed.
KW - Anatase
KW - Brookite
KW - C/N-TiO
KW - Microcystin-LR
KW - Photodegradation
KW - Visible light
UR - http://www.scopus.com/inward/record.url?scp=85065641695&partnerID=8YFLogxK
U2 - 10.3390/ma12071027
DO - 10.3390/ma12071027
M3 - Article
VL - 12
JO - MATERIALS
JF - MATERIALS
SN - 1996-1944
IS - 7
M1 - 1027
ER -