[논문]Excitation and Emission Properties of Adsorbed U(VI) on Amorphous Silica Surface

Jung, Euo Chang; Kim, Tae-Hyeong; Kim, Hee-Kyung; Cho, Hye-Ryun; Cha, Wansik

doi:10.7733/jnfcwt.2020.18.4.497

[국내논문] Excitation and Emission Properties of Adsorbed U(VI) on Amorphous Silica Surface 원문보기

Journal of nuclear fuel cycle and waste technology = 방사성폐기물학회지, v.18 no.4, 2020년, pp.497 - 508

Jung, Euo Chang (Korea Atomic Energy Research Institute) , Kim, Tae-Hyeong (Korea Atomic Energy Research Institute) , Kim, Hee-Kyung (Korea Atomic Energy Research Institute) , Cho, Hye-Ryun (Korea Atomic Energy Research Institute) , Cha, Wansik (Korea Atomic Energy Research Institute)

Abstract ▼ AI-Helper

In the geochemical field, the chemical speciation of hexavalent uranium (U(VI)) has been widely investigated by performing measurements to determine its luminescence properties, namely the excitation, emission, and lifetime. Of these properties, the excitation has been relatively overlooked in most time-resolved laser fluorescence spectroscopy (TRLFS) studies. In this study, TRLFS and continuous-wave excitation-emission matrix spectroscopy are adopted to characterize the excitation properties of U(VI) surface species that interact with amorphous silica. The luminescence spectra of U(VI) measured from a silica suspension and silica sediment showed very similar spectral shapes with similar lifetime values. In contrast, the excitation spectra of U(VI) measured from these samples were significantly different. The results show that distinctive excitation maxima appeared at approximately 220 and 280 nm for the silica suspension and silica sediment, respectively.

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제안 방법

(Andor, SR-303i). The time-resolved luminescence spectra were recorded by accumulating 100 laser pulses using two different gated intensified charge-coupled devices (ICCD, Andor, DH-720/18U-03 iStar 720D for λex = 266, 355, and 410-500 nm, and DH320T-18U-93 for λex = 220-400 nm) attached to the outlet ports of the spectrographs. All spectra were measured using a 1,000 μs gate width (tw) and varying gate delay time (td).

대상 데이터

A high-purity grade silica gel with a particle size of 40-63 μm (Sigma-Aldrich 227196) was used. The pore size of the silica gel reported by the manufacturer was approximately 6 nm (0.
sources. Two OPOs were operated at different wavelength ranges of 220-400 nm (Continuum, Horizon I) and 410-500 nm (OPOTEK, Vibrant B). All lasers were operated at a repetition rate of 10 Hz.
Excitation spectra were recorded by scanning the excitation wavelength from 200 to 500 nm with a 2 nm step. Emission spectra were measured using a CCD in the wavelength range of 242-823 nm, with a resolution of 1.16 nm. The integration times were 5 and 0.

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