目录
摘要Ⅱ
关键词Ⅱ
AbstractⅢ
引言
引言1
1材料与方法3
1.1化学试剂与仪器3
1.1.1主要化学试剂及实验仪器 3
1.1.2化学试剂的配制4
1.2吸附剂的制备5
1.3五价砷的吸附实验操作5
1.4吸附剂等电点的测定5
1.5五价砷浓度的测定方法6
1.6五价砷的标准曲线6
2结果与分析7
2.1溶液初始pH对五价砷吸附的影响7
2.2五价砷的吸附热力学8
2.3五价砷的吸附动力学10
2.4竞争离子对五价砷吸附的影响12
2.5五价砷吸附机理探讨13
3结论14
致谢14
参考文献14
磁性基掺硫铁铜镧三元金属复合氧化物吸附去除水中As(V)的效果研究
摘要
水中的砷具有高毒性、高稳定性、污染区域大、难于治理的特点，近年来国内外对中砷污染的去除越来越重视。吸附法由于去除效率高、成本低、操作简单等优点，在去除水中砷污染方面具有独特的优势和良好的发展前景。本文通过化学共沉淀法合成了磁性基掺硫铁铜镧三元金属复合氧化物(SFeCuLaO)，研究了SFeCuLaO对水中As(V)的去除效果。通过控制变量法探究了溶液初始pH、竞争阴离子、As(V)的初始浓度、吸附时间等因素对SFeCuLaO吸附去除水中As(V)的影响，确定了最佳的吸附条件，并对吸附过程的动力学和热力学进行了拟合。最后，通过加入自由基抑制剂简单探讨了As(V)的吸附机理。结果表明，在pH 47范围内SFeCuLaO对As(V)的吸附效果都很好，As(V)的去除率均达到99%以上。在研究的五种竞争阴离子中，Cl(、NO3(、SO42(、CO32(对As(V)的吸附没有影响，而PO43(对As(V)吸附具有明显的抑制作用。SFeCuLaO对As(V)的吸附符合准二级动力学模型和Langmuir吸附等温模型，拟合得到的吸附量为270.27 mg/g，与实验值（267 mg/g）非常接近。在As(V)吸附过程中没有•OH和O *51今日免费论文网|www.51jrft.com +Q: ^351916072^ 
2•(产生，As(V)的去除是通过静电引力被吸附到SFeCuLaO表面，并进一步与吸附剂表面的羟基进行离子交换。
Efficient Removal of As(V) from water by adsorption of magnetic sulfurdoped ironcopperlanthanum ternary metal composite oxide
ABSTRACT
Arsenic in water has the characteristics of high toxicity, high stability, large pollution area and difficulty in treatment. Due to the advantages of high removal efficiency, low cost and simple operation, adsorption method has unique advantages and good prospects in removing arsenic pollution in water. In this paper, SFeCuLaO was synthesized by chemical coprecipitation method, and its removal effect on As(V) in water was studied.The influence of initial pH of solution, competitive anion, initial concentration of As(V), adsorption time and other factors on the adsorption of As(V) in SFeCuLaO water was investigated by means of control variable method, and the optimal adsorption conditions were determined, and the kinetics and thermodynamics of the adsorption process were fitted. Finally, the adsorption mechanism of As(V) was discussed simply by adding free radical inhibitor. The results showed that the adsorption effect of SFeCuLaO on As(V) was good in the range of pH 47, and the removal rate of As(V) was above 99%.Among the five competitive anions studied, Cl, NO3, SO42and CO32 have no effect on As(V) adsorption, while PO43 has an obvious inhibitory effect on As(V) adsorption. The adsorption of As(V)by SFeCuLaO is in accordance with the pseudosecondorder kinetic model and Langmuir adsorption isotherm model. The amount of adsorption is 270.27 mg/g, which is very close to the experimental value (267 mg/g). In the process of As(V) adsorption, there is no generation of •OH and O2•(. The removal of As(V) is adsorbed to the surface of SFeCuLaO by electrostatic attraction, and further ion exchange with the hydroxyl on the surface of the adsorbent.

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