Effect of pH on the photocatalytic removal of silver ions by β-MnO2 particles

被引：9
|
作者：
Chiam, Sin-Ling [1 ]
Le, Anh Thi [1 ]
Pung, Swee-Yong [1 ]
Yeoh, Fei-Yee [1 ]
机构：
[1] Univ Sains Malaysia, Sch Mat & Mineral Resources Engn, Engn Campus, Nibong Tebal 14300, Pulau Pinang, Malaysia
来源：
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS | 2021年 / 28卷 / 02期
关键词：
manganese oxide (MnO2); silver; metal ion removal; photocatalyst;
D O I：
10.1007/s12613-020-2062-8
中图分类号：
T [工业技术];
学科分类号：
08 ;
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 beta-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 beta-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 beta-MnO2 particles and Ag(I) ions as well as the suppression of electron-hole recombination in the presence of H+ ions.
引用
收藏
页码：325 / 334
页数：10
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