Acta Phys. -Chim. Sin. ›› 2017, Vol. 33 ›› Issue (2): 413-418.doi: 10.3866/PKU.WHXB201610241

• ARTICLE • Previous Articles     Next Articles

Structure Development during the Cation Exchange Processes of Graphite Oxide

Quan-Jun WANG1,Hong-Juan SUN2,*(),Tong-Jiang PENG2,3,Ming-Zhu FENG2   

  1. 1 School of Science, Southwest University of Science and Technology, Mianyang 621010, Sichuan Province, P. R. China
    2 Institute of Mineral Materials & Application, Southwest University of Science and Technology, Mianyang 621010, Sichuan Province, P. R. China
    3 Center of Forecasting and Analysis, Southwest University of Science and Technology, Mianyang 621010, Sichuan Province, P. R. China
  • Received:2016-08-26 Published:2017-01-12
  • Contact: Hong-Juan SUN E-mail:sunhongjuan@swust.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(41272051);Doctor Foundation of Southwest University of Science and Technology, China(11ZX7135);Postgraduate Innovation Fund Project by Southwest University of Science and Technology, China(15ycx073)

Abstract:

Oxygen-containing hydroxyl (-C-OH) and carboxyl (-COOH) functional groups on both the basal planes and edges of the graphite oxide (GO) structure can dissociate to form H+ in water, thus providing cation exchange ability. The cation exchange capacity (CEC) of GO was measured accurately using the Stiasny method and the intermediate products of cation exchange processes of oxygen-containing functional groups and structure development were analyzed by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The results indicated that the CEC of GO was up to 541.48 mmol/100 g. After NH4+ and Ca2+ exchange processes, GO still maintained a stable lamellar structure, and the c axis spacing increased by 0.1499 and 0.2905 nm, respectively. NH4+ and Ca2+ were mainly in the form of exchangeable cations in the interlayer space of GO, and formed a hydrated cation layer with water molecules, part of the containing[NH4(H2O)6]+ or[Ca(H2O)6]2+ formed near the edge of the structural layer, balancing the negative charges originating from hydrolysis of the carboxyl groups of the GO structural layer.

Key words: Graphite oxide, Oxygen-containing functional group, Cation exchange capacity, Interlayer space, Structure development

MSC2000: 

  • O647