【作者】 谢莉；

【导师】 陶勇；

【作者基本信息】 中国疾病预防控制中心 ， 公共卫生， 2010， 硕士

【摘要】 本研究制备了不同晶型的纳米二氧化锰α-MnO2、β-MnO2和δ-MnO2,并对其吸附三价砷(As(Ⅲ))、五价砷(As(V))、一甲基砷(MMA)、二甲基砷(DMA)进行了研究。在对已有的除砷方法进行分析、研究的基础上,提出了以预氧化吸附技术为原理的除砷方法。研究以高锰酸钾、硫酸锰、过硫酸铵等为主要原料,制得新型吸附剂,用这种吸附剂可通过预氧化与吸附同时进行,将水中的各形态砷除去。实验对这种新型除砷吸附剂的除砷条件进行了探讨。采用静态吸附除砷实验,对除砷效果及影响因素进行了讨论。实验结果表明,纳米二氧化锰能有效地将含砷量为1.0mg/L的水降至我国饮水卫生标准0.01mg/L以下,吸附过程受pH、温度、砷初始浓度和时间的影响。与其他除砷吸附剂相比,纳米二氧化锰有良好的去除效果。吸附动力学研究表明：α-MnO2、β-MnO2和δ-Mn02对水中各形态砷的吸附符合Langmuir吸附等温方程。其中,α-MnO2对各形态砷的去除效果最好,可将含砷量高达2.0mg/L的水降至我国饮水卫生标准0.01mg/L以下。a-MnO2对As (Ⅲ)、As (Ⅴ)、MMA、DMA的最大吸附容量分别为103.09mg/g、106.38 mg/g、92.59 mg/g和95.24 mg/g。实验研究表明,纳米二氧化锰除砷方法具有除砷效率高、原料易得、去除快速的优点,是一种很有发展前景的去除生活饮用水中的砷的方法。更多还原

【Abstract】 This study prepared different types of nano-crystal manganese dioxidesα-MnO2、β-MnO2 andδ-MnO2, and the adsorption of Arsenite (As (Ⅲ)), Arsenate (As(Ⅴ)), Monomethylarsonous acid (MMA), Dimethylarsinic acid (DMA) byα-MnO2、β-MnO2 andδ-MnO2 was studied. Based on analysis of the existing methods of arsenic removal, this research presented an arsenic removal method classified as pre-oxidation and adsorption technology. The study prepared a new adsorbent with potassium permanganate, manganese sulfate, and ammonium persulfate as main raw materials, and this adsorbent can function as pre-oxidation and adsorption at the same time and remove various forms of arsenic from water. The experiments investigated the conditions of arsenic removal by this new arsenic removal adsorbent. The experiments of arsenic removal by static adsorption were conducted, and the effect and influence factors of the arsenic removal were discussed. The results showed that water of 1.0mg/L As can be effectively reduced to below 0.01mg/L by nano-manganese dioxide, which is the drinking water health standard in China. The adsorption process is affected by pH, temperature, initial arsenic concentration and time period. Compared with other arsenic removal adsorbents, the nano-crystal manganese dioxides achieve good removal effect. Adsorption kinetics study shows that:the absorption of various forms of arsenic byα-MnO2,β-MnO2 andδ-MnO2 is in accordance with Langmuir Adsorption Isotherm.α-MnO2 is the best in various forms of arsenic removal, andα-MnO2 can reduce water of 2.0mg/L As to below 0.01mg/L. The maximum adsorption capacity of As (Ⅲ), As (Ⅴ), MMA, DMA respectively are 103.09mg/g,106.38mg/g,92.59mg/g and 95.24mg/g.The experimental studies have shown that nano-manganese dioxide method for arsenic removal has the advantages of high removal efficiency, easy-to-prepare reactants, and rapid removal process. Nano-manganese dioxide method for arsenic removal is a prospective removal method of arsenic in drinking water.更多还原