氧化石墨阳离子交换容量测定过程中结构的变化

引用本文: 王泉珺, 孙红娟, 彭同江, 冯明珠. 氧化石墨阳离子交换容量测定过程中结构的变化[J]. 物理化学学报, 2017, 33(2): 413-418. doi: 10.3866/PKU.WHXB201610241 shu

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

氧化石墨阳离子交换容量测定过程中结构的变化

1.
西南科技大学理学院, 四川绵阳 621010;
2.
西南科技大学矿物材料及应用研究所, 四川绵阳 621010;
3.
西南科技大学分析测试中心, 四川绵阳 621010
基金项目:
国家自然科学基金（41272051），西南科技大学博士基金（11ZX7135）及西南科技大学研究生创新基金（15ycx073）资助项目

摘要: 氧化石墨（GO）结构层上的碳羟基（-C-OH）和边缘羧基（-COOH）在水介质中发生质子化反应解离出的H⁺具有阳离子可交换性。实验采用甲醛缩合法测量了GO的阳离子交换容量（CEC），用X射线衍射（XRD）、傅里叶变换红外（FTIR）光谱和X射线光电子能谱（XPS）分析测试手段对GO阳离子交换过程中间产物的结构变化进行了分析。结果表明，GO的CEC高达541.48 mmol/100 g。NH₄⁺和Ca²⁺交换后的GO，保持稳定的层状结构，c轴方向层间距分别增大了0.1499和0.2905 nm。NH₄⁺和Ca²⁺主要以层间可交换阳离子形式存在于层间域中，并与水分子形成可交换水化阳离子层，部分以[NH₄（H₂O）₆]⁺和[Ca（H₂O）₆]²⁺的形式存在于结构层的边缘附近，共同平衡结构层水解产生的负电荷。

关键词:

English

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).

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:

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沈阳化工大学材料科学与工程学院沈阳 110142

氧化石墨阳离子交换容量测定过程中结构的变化

English

Structure Development during the Cation Exchange Processes of Graphite Oxide

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氧化石墨阳离子交换容量测定过程中结构的变化

English

Structure Development during the Cation Exchange Processes of Graphite Oxide

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

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