【公開日：2025.06.10】【最終更新日：2025.04.03】

課題データ / Project Data

課題番号 / Project Issue Number

24KT0039

利用課題名 / Title

Quantum dot ZnO@TiO₂ nanorods for use in dye water treatment

利用した実施機関 / Support Institute

京都大学 / Kyoto Univ.

機関外・機関内の利用 / External or Internal Use

外部利用/External Use

技術領域 / Technology Area

【横断技術領域 / Cross-Technology Area】（主 / Main）計測・分析/Advanced Characterization（副 / Sub）-

【重要技術領域 / Important Technology Area】（主 / Main）マルチマテリアル化技術・次世代高分子マテリアル/Multi-material technologies / Next-generation high-molecular materials（副 / Sub）革新的なエネルギー変換を可能とするマテリアル/Materials enabling innovative energy conversion

キーワード / Keywords

コンポジット材料/ Composite material

利用者と利用形態 / User and Support Type

利用者名（課題申請者）/ User Name (Project Applicant)

Yothin Chimupala

所属名 / Affiliation

Chiang Mai University Chemistry

共同利用者氏名 / Names of Collaborators in Other Institutes Than Hub and Spoke Institutes

ARIM実施機関支援担当者 / Names of Collaborators in The Hub and Spoke Institutes

Mitsutaka Haruta

利用形態 / Support Type

（主 / Main）技術代行/Technology Substitution（副 / Sub）,共同研究/Joint Research

利用した主な設備 / Equipment Used in This Project

KT-403：モノクロメータ搭載低加速原子分解能分析電子顕微鏡

報告書データ / Report

概要（目的・用途・実施内容）/ Abstract (Aim, Use Applications and Contents)

This research studies composite catalysts made of zinc oxide (ZnO) nanoparticles deposited on the surface of titanium dioxide (TiO₂) nanorods for dye wastewater treatment, using three different treatment processes: Photocatalysis, Piezocatalysis, and Piezo-enhanced Photocatalysis. The 30%ZnTiO2_700 composite catalyst showed the best photocatalytic efficiency at 33.9%. However, the piezocatalytic performance of all composite catalysts was low. The dye degradation in the Piezo-enhanced photocatalysis system, however, showed a higher degradation efficiency than photocatalysis alone in all samples. The best dye degradation, with a removal rate of 45.3%, came from the piezo-enhanced photocatalysis using the 20%ZnTiO2_700 sample. The aim of this research is to use HRTEM and EELS to investigate the phase formation of Zn₂Ti₃O₈ at interlayer between quantum dot ZnO at the surface of TiO₂ nanorods.

実験 / Experimental

 The hydrogen titanate nanorods were synthesized by the hydrothermal process. Then, ZnO nanoparticles were deposited onto the surface of the hydrogen titanate nanorods via the co-precipitation method. Zinc acetate was used as the Zn precursor at 20%, 30%, and 50% by weight of hydrogen titanate, named 20%ZnTiO2_700, 30%ZnTiO2_700, and 50%ZnTiO2_700, respectively. The reaction was performed at 60°C for 2 hours in a KOH solution. The precipitate powders were calcined at 700°C for 5 hours to obtain the desired composite material of ZnO nanoparticles deposited on titanium dioxide nanorods. To study the dye degradation efficiency, 25 mg of the composite catalysts in 100 ml of dye wastewater were used to degrade rhodamine B dye at a concentration of 5 mg/l under UV-C irradiation and/or ultrasonic radiation (120 W, 40 kHz) for 240 minutes.

結果と考察 / Results and Discussion

The material is a composite of ZnO quantum dots deposited on the TiO₂ nanorods for catalytic applications. The interface between ZnO quantum dots and TiO₂ needs to be studied for phase formation and interlayer bonding. However, as shown in Fig.1, the interface cannot be seen between ZnO and TiO₂ in HRTEM because the ZnO particles and TiO₂ nanorods are at different heights, making it difficult to focus both particles in 1 frame to see the interface region between ZnO and TiO₂.

図・表・数式 / Figures, Tables and Equations

Fig.1 HRTEM image of ZnO quantum dots deposited on the TiO₂ nanorods

その他・特記事項（参考文献・謝辞等） / Remarks(References and Acknowledgements)

成果発表・成果利用 / Publication and Patents

論文・プロシーディング（DOIのあるもの） / DOI (Publication and Proceedings)

口頭発表、ポスター発表および、その他の論文 / Oral Presentations etc.

特許 / Patents

特許出願件数 / Number of Patent Applications：0件
特許登録件数 / Number of Registered Patents：0件