【作者】 田蕾；

【导师】 夏世斌；

【作者基本信息】 武汉理工大学 ， 环境工程， 2010， 硕士

【摘要】 随着我围社会经济迅速发展,原来并不被人们所关注的砷污染已日益严重。由于砷化物具有较大毒性且在工农业生产中广泛应用,砷对环境污染特别是对水质污染等问题,引起全世界环境学科工作者普遍关注。因此,寻找一种除砷彻底,操作简单,成本低廉的水质除砷方法。对含砷废水处理和饮水净化有着现实意义。本文利用镁渣与赤泥制备的新型陶瓷滤球作为吸附材料,分别为镁渣陶瓷滤球(MPB)与赤泥基生态陶瓷滤球(RPB),将其资源化利用,并且将TiO2负载在陶瓷滤球上进行改性,分别为负载TiO2镁渣陶瓷滤球与负载TiO2赤泥基生态陶瓷镁渣滤球,进行了其对水质中砷的去除规律与机理的研究。通过本课题研究得到以下结论。(1)本试验研究了MPB-Ti对As(V)离子的去除规律,研究表明,对于浓度为2mg/L的溶液,其最佳吸附条件为：溶液pH=2,吸附时间240min,滤球投加量20g/L,其砷的去除率可达95.96%。经L9(34)正交试验近一步分析,得到去除As(V)的最佳工艺条件为温度、时间、投加量、pH分别为323K、6h、6g、2时,MPB-Ti对As(V)离子的吸附效果可达99%以上。(2)MPB-Ti对As(V)的吸附动力学符合拟二级吸附动力学模型,且在不同浓度与不同温度的影响下,分别求出了其吸附速率常数,及吸附达到吸附平衡一半的时间,吸附活化能为10.517kJ/mol;研究了MPB-Ti对赴(V)吸附的热力学,研究发现MPB-Ti吸附As(V)可用Freundlich方程较好描述,求出其吸附熵(?)S=16.48J/(k-mol)。吸附焓(?)H=36.609kJ-mol。吸附自由能么G均小于零,说明吸附是个自发过程。(3)比较研究四种吸附材料在pH3-11范围内吸附As(Ⅲ)的规律,发现MPB-Ti吸附效果明显优于其他吸附材料；研究表明,MPB-Ti吸附As(Ⅲ)在中性与弱碱性条件下达到最佳。(4)经L16(45)正交试验分析,材料的种类对去除As (Ⅲ)影响最为显著。以MPB-Ti为最佳。当a取0.1时,吸附材料F=2.838>F0.1(3,15)=2.49,吸附材料差异显著此时表现显著。L9(34)正交试验表明MPB-Ti吸附去除As(Ⅲ)最佳条件为：温度、时间、投加量、pH分别为313K、3h、4g、8时,MPB-Ti对As(Ⅲ)离子的吸附效果可达85%以上；(5)在pH=2,投加量为4g,吸附时间为4h的条件下研究了MPB-Ti光催化氧化吸附同步去除As(Ⅲ),吸附去除率可提升11%。更多还原

【Abstract】 With the rapid development of the social economy and technology,the pollution ofarsenic unknown in the past is increasingly serious in the water source.Recently, because the arsenic compounds are lethal toxicants and widely—used in the agriculture and industry,environmental scientists around the world have paidattention to the problems brought out by arsenic compounds that contaminates theenvironment, especially in the water sources. Therefore, it makes importantse. nse to develop a thorough, simple and economical method to remove the arsenicfrom the wastewater or drinking water source at present.The article uses ceramic filter material made of magnesium slag and red mud as adsorption, which is magnesium slag ceramic filter (MPB) and red mud and ecological ceramic filter (RPB)that can be put into reuse and recycle. Its utilization of TiO2 load in the ceramic filter on the ball is modified, which is magnesium slag ball loaded TiO2 and red mud and ecological ceramic magnesium slag ball loaded TiO2. And the passage also includes the research and mechanism of the removal of Arsenic. Through the research of the topic, we reach these conclusions.(1) the experiment research on the regulation of MPB-Ti’s removal of As(V), and research shows that the best absorptive condition of concentration of 2mg/L is pH=2,240min time, filter ball dosing quantity 20g/L. The arsenic removal can reach 95.96%. Through orthogonal test L9 (34), we find the optimum technological conditions to remove As(V) is temperature for 323K, time for 6h, dosing quantity for 6g and pH for 2. And the effect of MPB-Ti’s ions adsorption of As(V) is above 99%.(2) MPB-Ti’s adsorption kinetics for As(V) fit with secondary adsorption dynamics model. And in different concentrations and under the influence of different temperature, we reach its adsorption and absorption rate constant, the half time of adsorption equilibrium adsorption, and activation energy for 10.517 kJ/mol. The research on thermodynamics of MPB-Ti’s adsorption for As(V), and find that it’s easy to describe MPB-Ti’s adsorption for As(V) by Freundlich equation. We reach its adsorption entropy (?)S=16.48J/(k-mol) and adsorption enthalpy (?)H=36.609kJ·mol.(?)G is less than zero which illustrates absorption is a spontaneous process.(3) Comparative study on the regulation of MPB-Ti’s adsorption for As(Ⅲ) of four adsorption materials ranging from pH=3 to pH=11 shows that the adsorption ability of MPB-Ti is superior to other adsorption materials. Research shows that MPB-Ti’s adsorption for As(Ⅲ) reaches its peak in neutral and weakly alkaline conditions.(4)Through L16 (45) orthogonal experiment, we find that it influence most by the types of adsorption through the removal of As(Ⅲ).And the MPB-Ti’s function is the best. When alpha take 0.1 and adsorption materials F=2.838> F0.1(3,15)=2.49 by adsorption materials, it shows significant difference at performance among the adsorption materials. L9 (34) orthogonal experiment shows that the best condition of MPB-Ti’s adsorption for As(Ⅲ) is temperature, time, dosing quantity, pH for 313K, 3h,4g,8. The effect of MPB-Ti’s adsorption for As(Ⅲ) can reach above 85%.(5) We do research on photo catalytic oxidation synchronic adsorption When pH=2, dosing quantity is 4g, adsorption time is 4h and find that the removal rate can add to 11%.更多还原