| pH值对β-MnO2颗粒光催化去除银离子的影响 |
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| 作者姓名： | Sin-Ling Chiam Anh Thi Le Swee-Yong Pung Fei-Yee Yeoh |
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| 作者单位： | School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia |
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| 基金项目： | Re-search University Grant ;This study was funded by Universiti Sains Malaysia |
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| 摘 要： | The presence of silver ions (Ag(I)) in wastewater has a detrimental effect on living organisms. Removal of soluble silver, especially at low concentrations, is challenging. This paper presents the use of β-MnO2 particles as a photocatalyst to remove Ag(I) ions selectively from aqueous solution at various pH levels. Inductively coupled plasma mass spectrometry (ICP-MS), X-ray diffraction (XRD), field emission electron microscope (FESEM), transmission electron microscopy (TEM), and X-ray photoelectron microscopy (XPS) were employed to determine the removal efficiency and to characterize the deposition of silver onto the surface of β-MnO2 particles. The optimum pH for the removal of Ag(I) ions was at pH 4 with 99% removal efficiency under 1 h of visible light irradiation. This phenomenon can be attributed to the electrostatic attraction between β-MnO2 particles and Ag(I) ions as well as the suppression of electron–hole recombination in the presence of H+ ions.
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| 关 键 词： | ,,,,, |
Effect of pH on the photocatalytic removal of silver ions by β-MnO2 particles |
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| Sin-Ling Chiam,Anh Thi Le,Swee-Yong Pung,Fei-Yee Yeoh.Effect of pH on the photocatalytic removal of silver ions by β-MnO2 particles[J].International Journal of Minerals,Metallurgy and Materials,2021,28(2):325-334. |
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| Authors: | Sin-Ling Chiam Anh Thi Le Swee-Yong Pung Fei-Yee Yeoh |
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| Abstract: | The presence of silver ions (Ag(I)) in wastewater has a detrimental effect on living organisms. Removal of soluble silver, especially at low concentrations, is challenging. This paper presents the use of β-MnO2 particles as a photocatalyst to remove Ag(I) ions selectively from aqueous solution at various pH levels. Inductively coupled plasma mass spectrometry (ICP-MS), X-ray diffraction (XRD), field emission elec-tron microscope (FESEM), transmission electron microscopy (TEM), and X-ray photoelectron microscopy (XPS) were employed to determ-ine the removal efficiency and to characterize the deposition of silver onto the surface of β-MnO2 particles. The optimum pH for the removal of Ag(I) ions was at pH 4 with 99％ removal efficiency under 1 h of visible light irradiation. This phenomenon can be attributed to the electrostat-ic attraction between β-MnO2 particles and Ag(I) ions as well as the suppression of electron-hole recombination in the presence of H+ ions. |
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| Keywords: | manganese oxide (MnO2) silver metal ion removal photocatalyst |
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