氧化石墨烯复合材料的制备及在染料吸附中的应用

发布时间：2018-01-16 22:29

本文关键词：氧化石墨烯复合材料的制备及在染料吸附中的应用　出处：《天津工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：氧化石墨烯(GO)材料由于其超大的比表面积和丰富的含氧官能团使其在染料吸附方面具有吸附速率快、吸附容量大的特点。然而由于其极易分散在水中且难于分离,对染料吸附后的处理过程带来了极大困难。本论文将GO分别和甘蔗渣、密胺海绵及聚乙烯醇(PVA)相结合,制备出了对水体中亚甲基蓝染料具有良好吸附性能的复合材料。具体内容及结果如下:首先,将GO负载于甘蔗渣表面,制备出了复合吸附材料。通过静态吸附和动态吸附探究了 GO的负载量对吸附材料吸附性能的影响。研究结果显示,GO/甘蔗渣复合材料对亚甲基蓝的最大吸附量为161mg/g,在柱吸附测试过程中,染料溶液pH值、吸附柱中吸附剂填充量以及甘蔗渣表面GO的负载量是影响吸附柱吸附容量的主要因素。其次,分别利用三种粗化方法对商业密胺海绵表面进行粗化处理,并将GO负载于其表面,制备了改性吸附海绵,探究了该改性海绵对亚甲基蓝染料的吸附性能。研究结果显示,采用多巴胺作为密胺海绵表面粗化方法所制得的复合海绵对亚甲基蓝的吸附效果最好,并且具有较快的吸附速率和较高的吸附容量。最后,将GO和PVA相混合,分别利用十二烷基硫酸钠和淀粉作为发泡剂制备出了两种PVA/GO复合吸附海绵。对该吸附材料进行了动力学过程和热力学过程拟合,并利用柱吸附实验检测了其吸附性能。研究结果显示,该吸附材料的吸附方式符合Langmuir吸附模型,吸附过程符合准二级动力学模型。两种海绵的最大吸附量分别为289.6mg/g和182.6mg/g,在柱吸附过程中不借助任何外部能量,仅仅依靠染料废水的自身重力便可以实现对亚甲基蓝的吸附分离,其水通量可达 20Lm~(-1)h~(-1).
[Abstract]:Graphene oxide (GOO) materials have high adsorption rate for dyes due to their large specific surface area and abundant oxygen-containing functional groups. However, because it is easy to be dispersed in water and difficult to separate, it brings great difficulties to the treatment of dye adsorption. In this paper, go and bagasse are divided into two groups, go and bagasse. Melamine sponge and polyvinyl alcohol PVA (PVA) were combined to prepare composite materials with good adsorption performance for methylene blue dyes in water. The specific contents and results are as follows: first of all. The composite adsorption materials were prepared by loading go on the surface of bagasse. The effects of the loading amount of go on the adsorption properties of bagasse were investigated by static and dynamic adsorption. The maximum adsorption capacity for methylene blue was 161 mg / g. The pH value of dye solution was measured by column adsorption. The amount of adsorbent filled in the adsorption column and the loading amount of bagasse surface go were the main factors affecting the adsorption capacity of the adsorption column. Secondly, three coarsening methods were used to roughen the surface of commercial melamine sponge. The modified adsorption sponge was prepared by loading go on its surface. The adsorption properties of the modified sponge to methylene blue dye were investigated. The results showed that the modified sponge could adsorb methylene blue dye. The composite sponge prepared by using dopamine as the surface coarsening method of melamine sponge has the best adsorption effect on methylene blue and has a faster adsorption rate and a higher adsorption capacity. Finally. Go and PVA are mixed. Two kinds of PVA/GO composite adsorption sponge were prepared by using sodium 12 alkyl sulfate and starch as foaming agents respectively. The kinetic and thermodynamic processes of the adsorbed sponge were simulated. The adsorption performance was tested by column adsorption experiment. The results showed that the adsorption mode of the adsorbed material was in accordance with the Langmuir adsorption model. The maximum adsorption capacity of the two sponges was 289.6 mg / g and 182.6 mg / g, respectively, without any external energy. The adsorption and separation of methylene blue can be realized by relying on the gravity of dye wastewater alone. The water flux of methylene blue can reach 20 L ~ (m ~ (-1)) ~ (-1) h ~ (-1) ~ (-1) ~ (-1).
【学位授予单位】：天津工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB33;TQ424

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