两种铁复合氧化物与土壤硼的界面反应特性及作用机制

项目名称： 两种铁复合氧化物与土壤硼的界面反应特性及作用机制

项目编号： No.41201228

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 地理学

项目作者： 任丽英

作者单位： 临沂大学

项目金额： 26万元

中文摘要： 氧化物对硼的吸附-解吸反应是影响土壤中硼转化的重要过程之一，在土壤中不同的氧化物常常共生形成复合氧化物，硼在复合氧化物表面的界面反应对硼在土壤中的化学行为将产生深刻的影响。本项目模拟土壤中常见的铁锰、铁铝氧化物存在形式，人工合成铁锰、铁铝两种复合氧化物，在硼与复合氧化物表面反应的基础上，通过红外光谱、X射线光电子能谱、X射线衍射、扫描电镜等表面分析技术研究硼在复合氧化物表面上的化学基团、原子价态、结构组成、微观形貌及吸附-解吸动力学，并将复合氧化物添加到土壤中，分析土壤硼形态、土壤酸度及氧化还原电位的动态变化。通过复合氧化物负载硼前后结构特性的变化，阐明复合氧化物与硼的界面反应过程；根据复合氧化物对土壤硼有效性的影响，揭示复合氧化物在土壤硼形态转化中的作用机理。研究结果对于阐明硼在土壤矿物界面吸附、迁移和转化规律，了解氧化物对土壤硼运移过程的影响具有重要的理论和实际意义。

中文关键词： 铁锰复合氧化物；铁铝复合氧化物；硼；界面反应；

英文摘要： Boron transformation in the soil is controlled by its adsorption and desorption reactions on oxides surface. Oxides usually coexist in soil and form binary oxides. The interface reaction on the surface of binary oxides play an important role in boron adsorption behavior in soil. In order to simulate the reaction process of binary oxide in natural soil,iron-manganese binary oxide and iron-aluminium binary oxide were synthesised. After boron was loaded on the binary oxides, the functional group, valence states of atoms, phase composition and microstructure of the binary oxides were characterized by infrared spectra analysis(FTIR), X-ray photoelectron spectroscopy(XPS), X-ray diffraction(XRD) and scanning electron microscopy. The adsorption-desorption kinetic process of boron were investigated. After added the binary oxides into soil, dynamic changes of soil boron fraction, soil pH and oxidoreduction potential were analyzed. Through the changes of the structure and surface characteristics,the interface reaction process between boron and binary oxides were illustrated. The mechanism of the soil boron transformation influenced by binary oxides were pvoved by soil boron availability changes. Research results have great value on explain boron adsorption and transformation process on soil mineral surface, and it has imp

英文关键词： Fe-Mn binary oxide；Fe-Al binary oxide；Boron；Interface reaction；