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

作　　者：张艳菲[1] 屠锦军[2] 胡春[2] 关东明[1] 

机构地区：[1]中国矿业大学化学与环境工程学院,北京100083 [2]中国科学院生态环境研究中心,北京100085

出　　处：《环境科学学报》2012年第11期2845-2850,共6页Acta Scientiae Circumstantiae

基　　金：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)~~

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41m2·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96h反应,去除率可达74%.A novel type of needle-llke 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 41m^2·g^-1, the structure of MnO2 consists of MnOs octahedral units, and the chemical state of Mn in the sample is Mn^4＋ . 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 deehlorination 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-diehlorophenol （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.

关 键 词：二氧化锰 酚类有机物 医药类污染物 脱氯 去除效率 

分 类 号：X53[环境科学与工程—环境工程]