简介概要

Preparation of Diphenylcarbazide-Directed Cd Se Quantum Dots and Selective Determination for Cr(Ⅵ)

来源期刊:Journal Of Wuhan University Of Technology Materials Science Edition2016年第5期

论文作者:石岩 SUN Ken

文章页码:972 - 976

摘    要:Cd Se quantum dots(QDs) were synthesized using diphenylcarbazide(DL) to sequester QDs precursors(Cd2+) in situ. Fluorescence(FL) analysis showed the successive synthesis of QDs could be realized by capping with DL and the binding between DL and Cd2+. The average QDs particle size was about 5-20 nm by high-resolution transmission electron microscopy(HRTEM). Fourier transform infrared(FT-IR) spectra showed that Cd Se QDs could be chemically bonded with DL. The formation of QDs-DL-Cr(Ⅵ) could lower the fluorescence intensity of QDs. In a certain concentration range, the fluorescence intensity and Cr(Ⅵ) concentration presented a linear relationship. As a result, this phenomenon could be used to determine the Cr(Ⅵ) concentration in the range of 0-24 ×10-6 mol· L-1.

详情信息展示

Preparation of Diphenylcarbazide-Directed Cd Se Quantum Dots and Selective Determination for Cr(Ⅵ)

石岩1,2,SUN Ken1

1. School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power2. Farmland Irrigation Research Institute,CAAS

摘 要:Cd Se quantum dots(QDs) were synthesized using diphenylcarbazide(DL) to sequester QDs precursors(Cd2+) in situ. Fluorescence(FL) analysis showed the successive synthesis of QDs could be realized by capping with DL and the binding between DL and Cd2+. The average QDs particle size was about 5-20 nm by high-resolution transmission electron microscopy(HRTEM). Fourier transform infrared(FT-IR) spectra showed that Cd Se QDs could be chemically bonded with DL. The formation of QDs-DL-Cr(Ⅵ) could lower the fluorescence intensity of QDs. In a certain concentration range, the fluorescence intensity and Cr(Ⅵ) concentration presented a linear relationship. As a result, this phenomenon could be used to determine the Cr(Ⅵ) concentration in the range of 0-24 ×10-6 mol· L-1.

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