氧化石墨烯负载纳米零价铁的制备及其对离子型染料的吸附
发布时间：2018-10-24 19:33
【摘要】：随着染料工业的迅速发展,染料废水所带来的环境污染日趋严重。当染料废水排入水体时,会对水质、水体生物、人体健康和生态造成巨大危害。吸附法因其具有处理效率高、适应性强、易操作等特点,在实际应用中得到广泛的关注。石墨烯是一种新型的碳纳米材料,具有高的比表面积、出众的电学性能和奇特的力学性能等特点,在吸附领域展现了巨大的潜力。本文采用常见的Hummer方法制备了氧化石墨烯,在此基础上采用改进的液相还原法把纳米零价铁负载在氧化石墨烯上制成氧化石墨烯纳米铁复合材料,通过扫描电镜(SEM)、X射线衍射分析仪(XRD)、Zeta电位仪和比表面积分析仪对其进行了表征。运用这种复合材料作为吸附剂去除水中的的阳离子染料亚甲基蓝和阴离子染料甲基橙,在吸附过程中研究了溶液p H、初始质量浓度、反应时间、反应温度对两种染料的吸附影响,为石墨烯的环境应用提供了理论依据。论文的主要内容有:(1)以石墨粉为原料,采用Hummer法和液相还原法制备复合吸附剂。由SEM图片可知,纳米零价铁以球形或短链形负载在氧化石墨烯上,增加了材料的反应活性位点;XRD图谱显示纳米零价铁成功地负载到氧化石墨烯上;Zeta电位测得氧化石墨烯负载纳米零价铁的等电点为3;氮吸附-解吸实验测得复合吸附剂的比表面积为158.32 m2/g。(2)探究氧化石墨烯负载纳米零价铁吸附亚甲基蓝过程中的影响因素。吸附最佳p H值为6;吸附最佳反应温度为25℃;Langmuir和Frenudlich两种等温吸附模型都能很好地描述复合材料对亚甲基蓝的吸附过程,最大吸附容量为201.2 mg/g;吸附过程符合准二级动力学模型,在5 h内基本达到吸附平衡。(3)探究氧化石墨烯负载纳米零价铁吸附甲基橙过程中的影响因素。吸附最佳p H值为2;吸附最佳反应温度为40℃;Langmuir和Frenudlich两种等温吸附模型都能很好地描述复合材料对甲基橙的吸附过程,最大吸附容量为53.289 mg/g;吸附过程符合准二级动力学模型,在1 h内基本达到吸附平衡。
[Abstract]:With the rapid development of dyestuff industry, the environmental pollution caused by dyestuff wastewater is becoming more and more serious. When dye wastewater is discharged into water, it will cause great harm to water quality, water organism, human health and ecology. Because of its high treatment efficiency, adaptability and easy operation, adsorption method has been widely used in practical applications. Graphene is a new carbon nano-material with high specific surface area, outstanding electrical properties and unique mechanical properties, which shows great potential in adsorption field. In this paper, graphene oxide was prepared by common Hummer method. Based on this, graphite oxide nanocrystalline iron oxide composite was prepared by using modified liquid phase reduction method to load nano-zero valent iron onto graphene oxide. It was characterized by scanning electron microscope (SEM) (SEM), X ray diffraction analyzer (XRD), Zeta potentiometer and specific surface area analyzer. The composite was used as adsorbent to remove cationic dye methylene blue and anionic dye methyl orange from water. The solution pH, initial mass concentration and reaction time were studied during the adsorption process. The effect of reaction temperature on the adsorption of two dyes provides a theoretical basis for the environmental application of graphene. The main contents of this paper are as follows: (1) the composite adsorbent was prepared by Hummer method and liquid reduction method using graphite powder as raw material. SEM images show that nanocrystalline zero-valent iron is loaded on graphene oxide in spherical or short chain shape. The reaction activity sites of the materials were increased; the XRD spectra showed that the nano-zero-valent iron was successfully loaded onto graphene oxide; the isoelectric point of graphene oxide supported nano-zero-valent iron was measured by Zeta potential; and the compound absorption was obtained by nitrogen adsorption-desorption experiment. The specific surface area of the adsorbent is 158.32 m2 / g. (2) the factors affecting the adsorption of methylene blue by graphene oxide supported on nanometer zero-valent iron are investigated. The best adsorption pH value is 6 and the optimum adsorption temperature is 25 鈩，
本文编号：2292348
[Abstract]:With the rapid development of dyestuff industry, the environmental pollution caused by dyestuff wastewater is becoming more and more serious. When dye wastewater is discharged into water, it will cause great harm to water quality, water organism, human health and ecology. Because of its high treatment efficiency, adaptability and easy operation, adsorption method has been widely used in practical applications. Graphene is a new carbon nano-material with high specific surface area, outstanding electrical properties and unique mechanical properties, which shows great potential in adsorption field. In this paper, graphene oxide was prepared by common Hummer method. Based on this, graphite oxide nanocrystalline iron oxide composite was prepared by using modified liquid phase reduction method to load nano-zero valent iron onto graphene oxide. It was characterized by scanning electron microscope (SEM) (SEM), X ray diffraction analyzer (XRD), Zeta potentiometer and specific surface area analyzer. The composite was used as adsorbent to remove cationic dye methylene blue and anionic dye methyl orange from water. The solution pH, initial mass concentration and reaction time were studied during the adsorption process. The effect of reaction temperature on the adsorption of two dyes provides a theoretical basis for the environmental application of graphene. The main contents of this paper are as follows: (1) the composite adsorbent was prepared by Hummer method and liquid reduction method using graphite powder as raw material. SEM images show that nanocrystalline zero-valent iron is loaded on graphene oxide in spherical or short chain shape. The reaction activity sites of the materials were increased; the XRD spectra showed that the nano-zero-valent iron was successfully loaded onto graphene oxide; the isoelectric point of graphene oxide supported nano-zero-valent iron was measured by Zeta potential; and the compound absorption was obtained by nitrogen adsorption-desorption experiment. The specific surface area of the adsorbent is 158.32 m2 / g. (2) the factors affecting the adsorption of methylene blue by graphene oxide supported on nanometer zero-valent iron are investigated. The best adsorption pH value is 6 and the optimum adsorption temperature is 25 鈩，
本文编号：2292348
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