Catalytic Oxidation of Arsenic in Water by Silver Nanoparticles

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境化学与生态毒理学国家重点实验室

	Catalytic Oxidation of Arsenic in Water by Silver Nanoparticles
	Guo Xiaoru; Yin Yongguang; Tan Zhiqiang; Liu Jingfu; Jiang Guibin
刊名	ACTA CHIMICA SINICA
	2018-05-15
卷号	76 期号:5 页码:387-392
关键词	arsenic silver nanoparticles catalysis environmental factors
ISSN号	0567-7351
文献子类	Article
英文摘要	With the development of nanoscience and nanotechnology, nanomaterials have been applied in many areas including environments. Silver nanoparticles (AgNPs) arc being widely used in drinking water disinfection due to their excellent bactericidal performance. As the bactericide, AgNPs could minimize or eliminate bacteria exceeding standards and water treatment membrane fouling. Arsenic contamination, especially in the underground water, has gained great attention from the environmental science community, demanding effective methods to eliminate or remove more acutely toxic inorganic species [i.e., As(III) and As(V)]. Given the good photocatalytic activity, AgNPs could have an impact on the transformaiton of As(III) and As(V). In this study, high performance liquid chromatography (HPLC) coupled with inductively coupled plasma mass spectrometer (HPLC-ICP/MS) were used to investigate the effects of some environmental relative factors like pH, natural organic matter, cation ions (e.g., Ca2+), and the intrinsic properties of AgNPs like size and coatings, on the conversion of the two main inorganic arsenic [As(III) and As(V)] in the aqueous solution in the presence of AgNPs. It was found that AgNPs showed no physical adsorption for As(III), while resulted in significant catalytic oxidation of As(III) into As(V). Moreover, environmental factors including pH, sunlight, NOM, Ca2+, and properties of AgNPs (e.g., size, coating) showed significant effects on the catalytic oxidation of As(III). The catalytic oxidation was also confirmed in the real environmental waters. Finally, the catalytic ability of AuNPs and AgNPs were compared to unveil the mechanism of catalytic oxidation of As(DI) by AgNPs. In addition to oxidation of superoxo or peroxo species formed due to activation of molecular oxygen by the electron transfer from negatively charged AgNPs, the redox potential of silver (phi Ag-Theta(+)/Ag-0=0.80 V) mostly contributed to the transformation of As(III) into As(V). Therefore, given the coexisting of As(III) and AgNPs in the water treatment system, AgNPs could play dual function in both sterilization and detoxification of As(III), which paved the novel way to effectively treat As contamination.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/40892]
专题	生态环境研究中心_环境化学与生态毒理学国家重点实验室
推荐引用方式 GB/T 7714	Guo Xiaoru,Yin Yongguang,Tan Zhiqiang,et al. Catalytic Oxidation of Arsenic in Water by Silver Nanoparticles[J]. ACTA CHIMICA SINICA,2018,76(5):387-392.
APA	Guo Xiaoru,Yin Yongguang,Tan Zhiqiang,Liu Jingfu,&Jiang Guibin.(2018).Catalytic Oxidation of Arsenic in Water by Silver Nanoparticles.ACTA CHIMICA SINICA,76(5),387-392.
MLA	Guo Xiaoru,et al."Catalytic Oxidation of Arsenic in Water by Silver Nanoparticles".ACTA CHIMICA SINICA 76.5(2018):387-392.