Preparation of graphene oxide composites and study on adsorption properties of copper ions
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摘要: 通过超声波和磁力搅拌法制备了氧化石墨烯-4A分子筛复合材料(GO-4A), 利用X射线衍射(X-ray diffraction, XRD)、傅里叶变换红外光谱(Fourier transform-infrared spectroscopy, FT-IR) 及扫描电子显微观察(scanning electron microscopy, SEM) 等多种手段对氧化石墨烯复合材料进行表征, 并研究了氧化石墨烯与4A分子筛在GO-4A复合材料中的质量比(复合比例) 对GO-4A吸附铜离子性能的影响。结果表明: 复合比例对GO-4A物相组成影响不大; 4A分子筛的加入会降低氧化石墨烯的团聚程度, 随着复合比例增大, 复合材料的热稳定性不断提高; 当氧化石墨烯和4A分子筛的复合比例为1:5时, 复合效果最佳, 在室温条件下, 溶液pH=6时, 对铜离子的去除效率可达到98.42%。Abstract: The composites of graphene oxide-4 A molecular sieve (GO-4 A) were prepared by ultrasonic and magnetic stiring method. The graphene oxide composites were characterized by X-ray diffraction analysis (XRD), Fourier transform-infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). The effects of component ratio (i.e., the mass fractions of graphene oxide and 4 A molecular sieve in GO-4 A composites) on the adsorption of copper ions were studied. The results show that, the influence of component ratio on the phase composition of GO-4 A composites is limited. With the increase in 4 A molecular sieve content, the aggregation degree of graphene oxide is decreased, and the thermal stability of GO-4 A composites is improved. When the component ratio is 1:5, the composite effect achieves the best, the removal of copper ions (Cu2+) is up to 98.42% at the room temperature and pH = 6.
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Key words:
- graphene oxide /
- molecular sieve /
- adsorption properties /
- copper ions
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图 1 不同复合比例制备的GO-4A复合材料X射线衍射光谱
Figure 1. X-ray diffraction patterns of GO-4A composites prepared by different component ratios (i.e., the mass fractions of graphene oxide and 4A molecular sieve in GO-4A composites)
图 2 不同复合比例制备的GO-4A复合材料傅里叶变换红外光谱
Figure 2. FT-IR patterns of GO-4A composites prepared by different component ratios
图 4 不同复合比例制备的GO-4A复合材料显微组织形貌: (a) GO-2; (b) GO-3; (c) GO-4; (d) GO-5; (e) GO-6
Figure 4. SEM images of GO-4A composites prepared by different component ratios: (a) GO-2; (b) GO-3; (c) GO-4; (d) GO-5; (e) GO-6
图 5 不同复合比例制备的GO-4A复合材料热重分析结果
Figure 5. Thermogravimetric analysis of GO-4A composites prepared by different component ratios
图 6 不同复合比例制备的GO-4A复合材料对铜离子去除效率的影响
Figure 6. Removal efficiency of Cu2+by GO-4A composites prepared by different component ratios
表 2 不同复合比例制备的GO-4A复合材料傅里叶变换红外光谱分析结果
Table 2. FT-IR analysis results of GO-4A composites prepared by different component ratios
cm-1 试样 O-H伸缩振动 O-H弯曲振动 C=C伸缩振动 C-OH伸缩振动 C-H伸缩振动 4A分子筛内部双四元环的特征振动 GO-2 3393 1643 1551 1075 934 589 GO-3 3387 1643 1555 1079 934 589 GO-4 3377 1636 1534 1065 940 590 GO-5 3382 1633 1541 1065 930 586 GO-6 3390 1640 1535 1062 — 580 
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