2020 Fiscal Year Annual Research Report
Clay supported metal-free photocatalysts for detoxification of pesticide and pharmaceutical hazards
| Project/Area Number |
19F19393
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| Research Institution | Kyushu University |
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Principal Investigator |
笹木 圭子 九州大学, 工学研究院, 教授 (30311525)
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| Co-Investigator(Kenkyū-buntansha) |
VELLAICHAMY BALAKUMAR 九州大学, 工学(系)研究科(研究院), 外国人特別研究員
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| Project Period (FY) |
2019-11-08 – 2022-03-31
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| Keywords | Porous carbon nitride / photocatalysis / contaminations / pharmaceuticals / pesticides / stability / reusability |
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| Outline of Annual Research Achievements |
Hollow porous g-C3N4 were successfully synthesized and characterized by XRD, FT-IR, BET, XPS, Pl, Impedance, Photocurrent, SEM, TEM and mapping analysis. The as-prepared metal-free nanocomposite shows an outstanding photocatalytic activity for the detoxification of ciprofloxacin under visible light irradiation. (Communicated to Chemical communications)
The porous g-C3N4 composite with polypyrrole and montmorillonite clay were synthesized and utilized for the degradation of metronidazole under visible light. The degradation pathways were confirmed by LC-MS analysis. (Submitted to Environmental Science Nano)
The GQDs decorated porous graphitic carbon nitride with polyaniline nanocomposite were prepared and used for the photocatalytic degradation of various toxic pollutants including ciprofloxacin, imidacloprid, tetracycline, phenol, and rhodamine B under similar conditions. (To be submitted to Applied Catalysis B Environmental)
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
Based on our proposed research plan, g-C3N4 composite with conducting polymers and clay were designed and synthesized. The synthesized composite materials were utilized for the visible light photocatalytic degradation of pharmaceuticals and pesticides. Currently, hollow porous g-C3N4 with different polymers (polyaniline, poly-o-anisidine and poly-o-toluidine) and montmorillonite nanocomposite were synthesized via an in-situ polymerization method. The resulting nanocomposite showed better photocatalytic degradation of metronidazole under visible light was achieved. Further, the photocatalytic influencing parameters, degradation intermediates and reaction pathways under process. Finally, we will prepare the manuscript and submit to the Journal.
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| Strategy for Future Research Activity |
To synthesize metal-free clay supported GQDs on hollow porous g-C3N4-grafted with graphene, carbon nanotube and fullerene and it will be characterized by DRS-UV, XPS, XRD, BET, FT-IR, TEM-EDX, Impedance, photocurrent and PL etc. The photocatalytic efficacy on pesticides (Imidacloprid, malathion and endosulfan) and pharmaceuticals (carbamazepine, ciprofloxacin, and tetracycline) wastewater effluents will be evaluated under visible light and the results will be monitored by UV-VIS, HPLC and LC-MS. The metal-free nanocomposite generates electrons and hole pairs in the presence of visible light. The generated electron and holes can create super oxide and hydroxide radicals, respectively. The excited electron-hole pairs of g-C3N4 and composite materials can be driven to migrate efficiently through GQDs, which is expected to reduce the recombination rate and enhance the photocatalytic activity. Finally, the report will be prepared and submitted to JSPS.
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