分散性MnO2吸附水中As的研究
分散性MnO2吸附水中As的研究(7600字)
摘 要:本论文利用四羟基氢氧化氨(TMA•OH),H2O2, MnCl2•4H2O制备了分散性MnO2,同时利用X射线衍射(XRD)、扫描电镜(SEM)和傅利叶红外光谱(FTIR)对样品进行表征,确定其相关特性。并研究了pH、砷的浓度、分散性MnO2的用量、温度、时间对分散性MnO2吸收水中As的影响。结果表明,其吸附效率在25~80◦C时随温度的升高而降低;在pH 2时,吸附效率达到70.90%,吸附砷达到平衡的时间30min;吸附等温线可以用Freundich吸附模型进行拟合,最大吸附容量可31.22mg/g。分散性MnO2是一种高效除砷的纳米材料,有很可观的应用前景。
关键词:MnO2; As;吸附
THE ABSORPTION OF ARSENIC FROM WATER BY DISPERSIVE MnO2
Abstract: Dispersive MnO2 was prepared from TMA•OH, H2O2 and MnCl2•4H2O, the samples were characterized with XRD, SEM and FTIR. Then we make a analysis of the influence of pH, dispersive MnO2 dosage, temperature, time and As concentration on effect of the absorption of arsenic from water by dispersive MnO2. The results showed that the adsorption was decreased as increasing temperature from 25~80℃. The MnO2 was able to remove 70.90% of arsenic in water at pH 2.0. Sorption of the arsenic to dispersive MnO2 reached equilibrium in 30 min. The adsorption isotherm was agreed well to the Freundlich adsorption model with maximum adsorption capacities of 31.22mg/g. The dispersive MnO2 are a potential high efficient nanomaterial for removal of arsenic from water. It has a considerable application prospect. [来源:http://www.doc163.com]
Key Words: dispersive MnO2 ;Arsenic; adsorption
[资料来源:http://Doc163.com]
目 录
摘 要 1
关键词 1
1. 前言 1
1.1 砷的污染概况及危害 2
1.2 国内外去除重金属方法的研究 2
1.3 研究目的 4
2. 材料仪器 4
2.1 试剂 4
2.2 仪器 4
3. 试验方法 4
3.1 分散性MnO2的制备与表征 4
3.2 砷溶液的配制及吸附实验 5
3.3 pH值对分散性MnO2材料吸收As的影响 5 [资料来源:http://doc163.com]
3.4 初始砷溶液浓度对分散性MnO2吸附As效果的影响 5
3.5 分散性MnO2的用量对吸收As的影响 5
3.6 实验温度对分散性MnO2吸收As的影响 5
3.7 实验时间对分散性MnO2吸收As的影响 6
4. 实验结果及分析: 6
4.1 分散性MnO2的特性 6
4.2 pH值对分散性MnO2吸收As的影响 7
4.3 As溶液浓度对分散性MnO2吸附效果的影响 8
4.4 分散性MnO2的用量对吸收As的影响 9
4.5 温度对分散性MnO2吸收As的影响 10
4.6 时间对分散性MnO2吸收As的影响 10
5. 红外分析 11
6. 结论 11
参考文献 12
致 谢 13 [资料来源:http://doc163.com]