研究报告
张艳菲,屠锦军,胡春,关东明.新型针状二氧化锰的制备、表征及其对土壤中有机物氧化性能研究[J].环境科学学报,2012,32(11):2845-2850
新型针状二氧化锰的制备、表征及其对土壤中有机物氧化性能研究
- Preparation, characterization and oxidizing properties of needle-like manganese dioxide
- 基金项目：中国科学院生态环境研究中心环境水质学国家重点实验室专项(No.KZCX2-EW-410); 国家高技术研究发展计划(863)(No. 2012AA062606)
- 作者
- 单位
- 张艳菲
- 中国矿业大学化学与环境工程学院,北京 100083
- 屠锦军
- 中国科学院生态环境研究中心,北京 100085
- 胡春
- 中国科学院生态环境研究中心,北京 100085
- 关东明
- 中国矿业大学化学与环境工程学院,北京 100083
- 摘要：由化学法合成了一种新型类针状的二氧化锰(MnO2)材料,通过X射线衍射(XRD)、透射电镜(TEM)、比表面积测试(BET)、傅里叶转换红外光谱(FTIR)和X射线光电子能谱(XPS)等手段表征其结构特性,由MnO2对酚类有机物和医药类污染物的去除实验来评价其活性.结果表明,此材料为典型的δ-MnO2,其比表面积相对较大,为41 m2·g-1,MnO2以MnO6八面体结构存在,Mn以MnO2形式存在.从MnO2对2-氯酚(2-CP)的去除及中间产物分析可知,MnO2对2-CP有较强的脱氯作用.另外,pH对2-CP的去除有较大影响.对酚类有机物和医药类污染物的去除实验考察发现,2,4-二氯酚(2,4-DCP)和2,4,6-三氯酚(2,4,6-TCP)的去除效率明显大于苯酚(Ph)和2-CP,而环丙沙星的去除与安替比林、布洛芬、苯妥英和苯海拉明相比更加容易,经过96 h反应,去除率可达74%.
- Abstract：A novel type of needle-like manganese dioxide (MnO2) was synthesized via a facile chemical method. The structural properties of MnO2 were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), the Brunauer-Emmett-Teller (BET) method, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The activity of MnO2 was evaluated in terms of phenols and pharmaceuticals removal in an aqueous solution. The results showed that the sample is poorly crystallized δ-MnO2, the measured surface area is 41 m2·g-1, the structure of MnO2 consists of MnO6 octahedral units, and the chemical state of Mn in the sample is Mn4+. As far as 2-chlorophenol (2-CP) removal and the intermediates in the reaction are concerned, the reaction of ring opening of benzene in the presence of MnO2 seems to be less favorable, although dechlorination of 2-CP is facile. In addition, the pH value plays an important role in the reaction. From phenols and pharmaceuticals removal investigation, we found that the removal efficiencies of 2,4-dichlorophenol (2,4-DCP) and 2,4,6-trichlorophenol (2,4,6-TCP) had significantly higher levels than those of Ph and 2-CP. Additionally, the result suggested that ciprofloxacin was highly susceptible to transformation mediated by MnO2. After 96 h reaction, the removal efficiency of ciprofloxacin was about 74%, clearly superior to antipyrine, ibuprofen, phenytoin and diphenhydramine.
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