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Oral presentation

DXAFS study on laser-induced photoreduction mechanism of Rh$$^{III}$$ ion complexes; Extraction of intermediates information by multivariate spectral analysis

Saeki, Morihisa*; Matsumura, Daiju; Nakanishi, Ryuzo*; Yomogida, Takumi; Tsuji, Takuya; Saito, Hiroyuki*; Oba, Hironori*

no journal, , 

The precious metal (PM) ions complexed with negative ions and water molecules in solution has a charge transfer absorption band in the UV region. When alcohol is added to such a PM$$^{n+}$$ complex solution and irradiated with an ultraviolet laser, the PM$$^{n+}$$ complex is electronically excited and reacts with the alcohol to be reduced to the neutral atom PM$$^{0}$$. The reduced PM$$^{0}$$ spontaneously aggregates in the solution to form fine particles. This process is called Laser-Induced Particle Formation (LIPF), and is used for the formation of precious metal nanoparticles and the recovery of precious metals from factory effluents. We have investigated the LIPF reaction mechanism of Rh$$^{3+}$$ ion complexes by in situ energy-dispersive X-ray absorption fine structure spectroscopy(XAFS). As a result of analyzing the obtained XAFS spectra, we found that Rh species with three oxidation numbers are involved in the Rh$$^{3+}$$reduction reaction, which proceeds from Rh$$^{3+}$$ to Rh$$^{int}$$ (intermediate) to Rh$$^{0}$$.

Oral presentation

Development of micro XAFS system at SPring-8 JAEA beamline BL22XU

Tanida, Hajime; Tsuji, Takuya; Kobata, Masaaki; Kitagaki, Toru

no journal, , 

In the decommissioning of Fukushima Daiichi Nuclear Power Plant, analysis of fuel debris is extremely important to understand its properties. The fuel debris to be removed on a trial basis and the samples available for analysis are expected to be fine particles. In the case of relatively large samples, handling becomes difficult due to the dose problem. Non-destructive X-ray analysis using X-rays, especially XAFS, is an effective analysis method for such samples, but in order to apply it to fine particles, X-rays must be focused to the micrometer order. For this purpose, a Kirkpatrick-Baez (KB) mirror was installed in the experimental hutch 3 of the RI building of the JAEA beamline BL22XU, which has a hard X-ray undulator as a light source, at SPring-8.

Oral presentation

Study of Cesium adsorption structure of biotite with different particle size

Tsuji, Takuya; Matsumura, Daiju; Kobayashi, Toru

no journal, , 

no abstracts in English

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