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
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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.
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