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 ofβ-MnO2 particles as...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 ofβ-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 ofβ-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 betweenβ-MnO2 particles and Ag(I)ions as well as the suppression of electron–hole recombination in the presence of H+ions.展开更多
基金This study was funded by Universiti Sains Malaysia, ResearchUniversity Grant (1001.PBAHAN.8014095). The authorsalso acknowledge the support from USM Fellowship.
文摘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 ofβ-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 ofβ-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 betweenβ-MnO2 particles and Ag(I)ions as well as the suppression of electron–hole recombination in the presence of H+ions.
