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Citation: WANG Quan-Jun, SUN Hong-Juan, PENG Tong-Jiang, FENG Ming-Zhu. Structure Development during the Cation Exchange Processes of Graphite Oxide[J]. Acta Physico-Chimica Sinica, ;2017, 33(2): 413-418. doi: 10.3866/PKU.WHXB201610241 shu

Structure Development during the Cation Exchange Processes of Graphite Oxide

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 Date: 26 August 2016
Revised Date: 24 October 2016

Fund Project: The project was supported by the National Natural Science Foundation of China (41272051), Doctor Foundation of Southwest University of Science and Technology, China (11ZX7135), and Postgraduate Innovation Fund Project by Southwest University of Science and Technology, China (15ycx073).

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.
- Graphite oxide,
- Oxygen-containing functional group,
- Cation exchange capacity,
- Interlayer space,
- Structure development
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