Photocatalytic Purification of Orange-II-Dye-Polluted Wastewater Using TiO<sub>2</sub>-Modified g-C<sub>3</sub>N<sub>4</sub> Composite
Textile dyes are considered to be one of the major sources of water pollution due to their complex chemical structures. Photocatalytic dye degradation is an eco-friendly method that uses light-activated catalysts to break down complex dye molecules in wastewater into harmless byproducts. In the pres...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-12-01
|
| Series: | C |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2311-5629/10/4/103 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850040906665689088 |
|---|---|
| author | Bin Guo Monir Uzzaman Mai Furukawa Ikki Tateishi Hideyuki Katsumata Satoshi Kaneco |
| author_facet | Bin Guo Monir Uzzaman Mai Furukawa Ikki Tateishi Hideyuki Katsumata Satoshi Kaneco |
| author_sort | Bin Guo |
| collection | DOAJ |
| description | Textile dyes are considered to be one of the major sources of water pollution due to their complex chemical structures. Photocatalytic dye degradation is an eco-friendly method that uses light-activated catalysts to break down complex dye molecules in wastewater into harmless byproducts. In the present study, pure and N-doped g-C<sub>3</sub>N<sub>4</sub> were synthesized using one-pot calcination. The fabrication of g-C<sub>3</sub>N<sub>4</sub>/TiO<sub>2</sub> and TC-g-C<sub>3</sub>N<sub>4</sub>/TiO<sub>2</sub> was accomplished by physical mixing. The prepared photocatalysts were used to treat the Orange-II-polluted wastewater. The structural properties, surface morphology, light-harvesting capability, and electrochemical properties were assessed using XRD, XPS, SEM, TEM, BET, DRS, PL, EIS, Mott–Schottky, and transient photocurrent response (TPCR) analyses. The improved charge separation and migration properties of g-C<sub>3</sub>N<sub>4</sub>/TiO<sub>2</sub> were confirmed by the PL, EIS, and TPCR results. TEM and XPS data confirmed the formation of a g-C<sub>3</sub>N<sub>4</sub>/TiO<sub>2</sub> composite. Enhanced photocatalytic decolorization was achieved for g-C<sub>3</sub>N<sub>4</sub>/TiO<sub>2</sub> compared with pure g-C<sub>3</sub>N<sub>4</sub> or TiO<sub>2</sub>. The 1 wt% g-C<sub>3</sub>N<sub>4</sub>/TiO<sub>2</sub> composite exhibited the highest (92.1%) decolorization efficiency during 60 min of UV irradiation. Furthermore, the pseudo-first-order reaction rate constant (k) of 1 wt% g-C<sub>3</sub>N<sub>4</sub>/TiO<sub>2</sub> was calculated to be 0.0213 min<sup>−1</sup>, which was 2.5 times better than that obtained with bare TiO<sub>2</sub>. Finally, for a better understanding of the g-C<sub>3</sub>N<sub>4</sub>/TiO<sub>2</sub> decolorization process, a possible reaction mechanism was proposed. |
| format | Article |
| id | doaj-art-94c654bb6f7f4edd87db63f008ddaeb2 |
| institution | DOAJ |
| issn | 2311-5629 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | C |
| spelling | doaj-art-94c654bb6f7f4edd87db63f008ddaeb22025-08-20T02:55:56ZengMDPI AGC2311-56292024-12-0110410310.3390/c10040103Photocatalytic Purification of Orange-II-Dye-Polluted Wastewater Using TiO<sub>2</sub>-Modified g-C<sub>3</sub>N<sub>4</sub> CompositeBin Guo0Monir Uzzaman1Mai Furukawa2Ikki Tateishi3Hideyuki Katsumata4Satoshi Kaneco5Department of Applied Chemistry, Graduate School of Engineering, Mie University, Tsu 514-8507, JapanDepartment of Applied Chemistry, Graduate School of Engineering, Mie University, Tsu 514-8507, JapanDepartment of Applied Chemistry, Graduate School of Engineering, Mie University, Tsu 514-8507, JapanMie Global Environment Center for Education & Research, Mie University, Tsu 514-8507, JapanDepartment of Applied Chemistry, Graduate School of Engineering, Mie University, Tsu 514-8507, JapanDepartment of Applied Chemistry, Graduate School of Engineering, Mie University, Tsu 514-8507, JapanTextile dyes are considered to be one of the major sources of water pollution due to their complex chemical structures. Photocatalytic dye degradation is an eco-friendly method that uses light-activated catalysts to break down complex dye molecules in wastewater into harmless byproducts. In the present study, pure and N-doped g-C<sub>3</sub>N<sub>4</sub> were synthesized using one-pot calcination. The fabrication of g-C<sub>3</sub>N<sub>4</sub>/TiO<sub>2</sub> and TC-g-C<sub>3</sub>N<sub>4</sub>/TiO<sub>2</sub> was accomplished by physical mixing. The prepared photocatalysts were used to treat the Orange-II-polluted wastewater. The structural properties, surface morphology, light-harvesting capability, and electrochemical properties were assessed using XRD, XPS, SEM, TEM, BET, DRS, PL, EIS, Mott–Schottky, and transient photocurrent response (TPCR) analyses. The improved charge separation and migration properties of g-C<sub>3</sub>N<sub>4</sub>/TiO<sub>2</sub> were confirmed by the PL, EIS, and TPCR results. TEM and XPS data confirmed the formation of a g-C<sub>3</sub>N<sub>4</sub>/TiO<sub>2</sub> composite. Enhanced photocatalytic decolorization was achieved for g-C<sub>3</sub>N<sub>4</sub>/TiO<sub>2</sub> compared with pure g-C<sub>3</sub>N<sub>4</sub> or TiO<sub>2</sub>. The 1 wt% g-C<sub>3</sub>N<sub>4</sub>/TiO<sub>2</sub> composite exhibited the highest (92.1%) decolorization efficiency during 60 min of UV irradiation. Furthermore, the pseudo-first-order reaction rate constant (k) of 1 wt% g-C<sub>3</sub>N<sub>4</sub>/TiO<sub>2</sub> was calculated to be 0.0213 min<sup>−1</sup>, which was 2.5 times better than that obtained with bare TiO<sub>2</sub>. Finally, for a better understanding of the g-C<sub>3</sub>N<sub>4</sub>/TiO<sub>2</sub> decolorization process, a possible reaction mechanism was proposed.https://www.mdpi.com/2311-5629/10/4/103g-C<sub>3</sub>N<sub>4</sub>/TiO<sub>2</sub>photocatalytic purificationOrange II dyewastewater |
| spellingShingle | Bin Guo Monir Uzzaman Mai Furukawa Ikki Tateishi Hideyuki Katsumata Satoshi Kaneco Photocatalytic Purification of Orange-II-Dye-Polluted Wastewater Using TiO<sub>2</sub>-Modified g-C<sub>3</sub>N<sub>4</sub> Composite C g-C<sub>3</sub>N<sub>4</sub>/TiO<sub>2</sub> photocatalytic purification Orange II dye wastewater |
| title | Photocatalytic Purification of Orange-II-Dye-Polluted Wastewater Using TiO<sub>2</sub>-Modified g-C<sub>3</sub>N<sub>4</sub> Composite |
| title_full | Photocatalytic Purification of Orange-II-Dye-Polluted Wastewater Using TiO<sub>2</sub>-Modified g-C<sub>3</sub>N<sub>4</sub> Composite |
| title_fullStr | Photocatalytic Purification of Orange-II-Dye-Polluted Wastewater Using TiO<sub>2</sub>-Modified g-C<sub>3</sub>N<sub>4</sub> Composite |
| title_full_unstemmed | Photocatalytic Purification of Orange-II-Dye-Polluted Wastewater Using TiO<sub>2</sub>-Modified g-C<sub>3</sub>N<sub>4</sub> Composite |
| title_short | Photocatalytic Purification of Orange-II-Dye-Polluted Wastewater Using TiO<sub>2</sub>-Modified g-C<sub>3</sub>N<sub>4</sub> Composite |
| title_sort | photocatalytic purification of orange ii dye polluted wastewater using tio sub 2 sub modified g c sub 3 sub n sub 4 sub composite |
| topic | g-C<sub>3</sub>N<sub>4</sub>/TiO<sub>2</sub> photocatalytic purification Orange II dye wastewater |
| url | https://www.mdpi.com/2311-5629/10/4/103 |
| work_keys_str_mv | AT binguo photocatalyticpurificationoforangeiidyepollutedwastewaterusingtiosub2submodifiedgcsub3subnsub4subcomposite AT moniruzzaman photocatalyticpurificationoforangeiidyepollutedwastewaterusingtiosub2submodifiedgcsub3subnsub4subcomposite AT maifurukawa photocatalyticpurificationoforangeiidyepollutedwastewaterusingtiosub2submodifiedgcsub3subnsub4subcomposite AT ikkitateishi photocatalyticpurificationoforangeiidyepollutedwastewaterusingtiosub2submodifiedgcsub3subnsub4subcomposite AT hideyukikatsumata photocatalyticpurificationoforangeiidyepollutedwastewaterusingtiosub2submodifiedgcsub3subnsub4subcomposite AT satoshikaneco photocatalyticpurificationoforangeiidyepollutedwastewaterusingtiosub2submodifiedgcsub3subnsub4subcomposite |