【公開日：2023.08.01】【最終更新日：2023.05.08】
課題データ / Project Data
課題番号 / Project Issue Number
22KU1012
利用課題名 / Title
合成した光触媒複合体のBET測定
利用した実施機関 / Support Institute
九州大学 / Kyushu Univ.
機関外・機関内の利用 / External or Internal Use
内部利用（ARIM事業参画者以外）/Internal Use (by non ARIM members)
技術領域 / Technology Area
【横断技術領域 / Cross-Technology Area】（主 / Main）物質・材料合成プロセス/Molecule & Material Synthesis（副 / Sub）-
【重要技術領域 / Important Technology Area】（主 / Main）次世代ナノスケールマテリアル/Next-generation nanoscale 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
pollutant degradation,ナノシート/ Nanosheet,ナノ粒子/ Nanoparticles
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)
Shenoy Sulakshana
所属名 / Affiliation
九州大学大学院工学研究院地球資源システム工学部門
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
利用形態 / Support Type
（主 / Main）機器利用/Equipment Utilization（副 / Sub）-
利用した主な設備 / Equipment Used in This Project
KU-501：電子状態測定システム
KU-517：ナノ炭素燃料電池評価装置群
報告書データ / Report
概要（目的・用途・実施内容）/ Abstract (Aim, Use Applications and Contents)
Ferrites are promising photocatalysts as they absorb a considerable fraction of visible light. Herein, a novel in- situ simple tactic polycondensation method was used to produce n-type porous graphitic carbon nitride nanosheets over p-type CaFe2O4 particles resulting in a quasi-polymeric heterojunction. The photocatalytic performance of synthesized g-C3N4/CaFe2O4 (gCN/CFO) was evaluated towards the photodegradation of ciprofloxacin and phenol. The gCN/CFO composite efficiently absorbed visible light and could separate and transport charge carriers through the p-n heterojunction. The surface area of the synthesized photocatalysts was measured by BET measurements. Photoluminescence spectra and photoelectrochemical characterizations. The surface oxidation states and valence band edge positions of the gCN/CFO composites were obtained by X-ray photoelectron spectroscopy (XPS). Moreover, it confirmed the photocatalytic reaction mechanism is a Z-scheme charge carrier transport route. based on the p-n heterojunction.
実験 / Experimental
X-ray photoelectron spectra (XPS) were collected on a ULVAC-PHI ESCA 5800 (ULVAC-PHI, Inc., Kanagawa, Japan) spectrometer using a monochromated Al Ka X-ray source operated at 200 W. Energy referencing was performed using the C 1s peak for adventitious carbon set to 284.6 eV, and peak fitting was undertaken using Casa XPS Version. The BET measurements were conducted on the BET BELSORP mini-II apparatus.
結果と考察 / Results and Discussion
Two peaks in the spectrum of C 1s were attributed to adventitious carbon impurity (CC) and sp 2-hybridized carbon in the aromatic ring (NC=N). The N 1s spectra of gCN had main peaks at 398.6 eV and 400.8 eV, corresponding to the sp2-hybridized nitrogen (C=N–C) link in the triazine rings and bridging nitrogen in gCN. The typical Ca 2p spectra, which have two peaks at 348.9 eV and 345.4 eV correlate with the Ca 2p1/2 and Ca 2p3/2 spin states of Ca2+ in CFO. The Fe 2p peak was deconvoluted demonstrating the existence of a Fe3+. 3+ The O 1s spectrum is ascribed to the lattice oxygen Fe-O and Ca-O. the peak at 533.1 eV correlated to the surface-adsorbed oxygen species. These XPS results show that the resulting composite is a heterojunction with significant interaction between the two components, rather than simple physical mixing.In the BET analysis, the gCN/CFO composite showed a surface area of 47 m2g-1, and pure gCN only showed a surface area of 37 m2g-1. The surface area improved after the formation of the composite.
図・表・数式 / Figures, Tables and Equations
その他・特記事項（参考文献・謝辞等） / Remarks(References and Acknowledgements)
Sulakshana Shenoy and Keiko Sasaki would like to thank the Japan Society for the Promotion of Sciences (JSPS) for providing postdoctoral fellowships for foreign researchers (JP21F21342, JP22H00266). X-ray photoelectron spectra and BET measurements were conducted at Advanced Analytical Center (Nanotechnology Platform), Kyushu University.
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)
-
Sulakshana Shenoy, Simple tactic polycondensation synthesis of Z-scheme quasi-polymeric g-C3N4/CaFe2O4 composite for enhanced photocatalytic water depollution via p-n heterojunction, Chemical Engineering Journal, 453, 139758(2023).
DOI: 10.1016/j.cej.2022.139758
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