Acta Chimica Sinica ›› 2019, Vol. 77 ›› Issue (11): 1177-1183.DOI: 10.6023/A19070276 Previous Articles     Next Articles



石磊a, 庞宏伟a, 王祥学b, 张盼b, 于淑君a*()   

  1. a 华北电力大学 环境科学与工程学院 资源环境系统优化教育部重点实验室 北京 102206
    b 华北电力大学 环境科学与工程系 燃煤电站烟气多污染物协同控制实验室 保定 071003
  • 投稿日期:2019-07-26 发布日期:2019-09-24
  • 通讯作者: 于淑君
  • 基金资助:

Study on the Migration and Transformation Mechanism of Graphene Oxide in Aqueous Solutions

Shi Leia, Pang Hongweia, Wang Xiangxueb, Zhang Panb, Yu Shujuna*()   

  1. a MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China
    b Heibei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China
  • Received:2019-07-26 Published:2019-09-24
  • Contact: Yu Shujun

Graphene oxide (GO) is widely used in energy chemical, environmental restoration, nanomaterials, liquid phase catalysis, etc. due to its excellent physical and chemical properties. At the same time, GO is inevitably discharged into nature during the application process, and the toxicity released into the environment may lead to instability of the biological system. Therefore, this paper systematically studied several common cations (Na+, K+, Ca2+, Mg2+), anions (PO43-, SO42-, CO32-, HCO3-, Cl-) and clay minerals (montmorillonite, kaolin, bentonite, nano-alumina) on GO coagulation at different concentrations. And FTIR is used to characterize the clay minerals before and after the precipitation of GO. The experimental results show that the cations have strong GO coagulation ability, and the coagulation ability of different valence cations has a large difference. After analysis, the electrical properties of GO in aqueous solution are negative, the cation acts as a counter ion, and the coagulation behavior conforms to the Schulze-Hardy rule. The main reason for the difference in coagulation ability between isovalent cations is electronegativity and ionic hydration. The anion acts to increase the stability of GO, and the coagulation ability of the cation is more effective than the stabilization ability of the anion. The ability of sodium salts with the same valence anion to coagulate GO also differs, mainly because the hydrolysis of HCO3- and CO32- causes a decrease in the negative charges, resulting in a decrease in the ability to stabilize GO. The clay minerals contain hydroxyl and metal-oxygen bonds that interact with GO. According to the maximum removal rate, the clay minerals have the coagulation ability:nano-alumina > kaolin > bentonite > montmorillonite. The main influencing factors are the electrical properties of clay minerals in aqueous solution. This paper is helpful to understand the coagulation behavior of GO in different water environments, and it is of great significance for the future application of graphene engineering in pollution control.

Key words: graphene oxide, coagulation, cation, anion, clay mineral