Acta Chim. Sinica ›› 2018, Vol. 76 ›› Issue (5): 387-392.DOI: 10.6023/A18020067 Previous Articles     Next Articles

Article

纳米银对水中三价砷的催化氧化研究

郭肖茹a,b, 阴永光a, 谭志强a, 刘景富a,b, 江桂斌a   

  1. a 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 北京 100085;
    b 中国科学院大学 北京 100049
  • 收稿日期:2018-02-09 出版日期:2018-05-15 发布日期:2018-03-26
  • 通讯作者: 刘景富,E-mail:jfliu@rcees.ac.cn;Tel.:010-62849192;Fax:010-62849192 E-mail:jfliu@rcees.ac.cn
  • 基金资助:

    国家重点研发计划(No.2016YFA0203102)和国家自然科学基金(Nos.21337004,21620102008)资助项目.

Catalytic Oxidation of Arsenic in Water by Silver Nanoparticles

Guo Xiaorua,b, Yin Yongguanga, Tan Zhiqianga, Liu Jingfua,b, Jiang Guibina   

  1. a State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing 100085;
    b University of Chinese Academy of Sciences, Beijing 100049
  • Received:2018-02-09 Online:2018-05-15 Published:2018-03-26
  • Supported by:

    Project supported by the National Key R&D Program of China (No. 2016YFA0203102), and the National Natural Science Foundation of China (Nos. 21337004, 21620102008).

With the development of nanoscience and nanotechnology, nanomaterials have been applied in many areas including environments. Silver nanoparticles (AgNPs) are 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(Ⅲ) 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 (φΘAg+/Ag0=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.

Key words: arsenic, silver nanoparticles, catalysis, environmental factors References