天然含钒金红石加热、淬火及电子辐射改性实验研究  

An experimental study on the modification of natural vanadiferous rutile by heating, quenching and electron irradiation

作　　者：刘娟[1] 鲁安怀[1] 郭延军[1] 李宁[1] 李巧荣[1] 郑佳[1] 

机构地区：[1]北京大学地球与空间科学学院,北京100871

出　　处：《岩石矿物学杂志》2003年第4期339-344,共6页Acta Petrologica et Mineralogica

基　　金：国家重大基础研究前期研究专项资助项目 ( 2 0 0 1CCA0 2 40 0 ) ;国家自然科学基金资助项目 ( 4 0 172 0 2 2 )

摘　　要：天然含钒金红石样品经过 12 73K加热、淬火和高能电子辐照处理后性质发生不同程度的变化。XRD谱峰显示处理前后样品没有发生物相变化 ,显微IR图谱证明原样、加热、淬火样品的表面有少量吸附水存在 ,而辐射样品的显微IR图谱上没有检测到吸附水的吸收峰。用XPS分析比较了处理前后样品表面主要元素Ti、O和V的价态及含量 ,结果表明 ,原样经过处理后表面钒和氧的原子百分含量增加 ,其中淬火样品表面吸附水和钒的含量相对于原样增加最为明显 ,光催化活性相应较高 ;加热样品表面的吸附水和钒的含量比原样稍有增加 ,光催化活性与原样相当 ;电子辐射样品表面钒的原子百分含量相对原样增加不明显 ,而对水的吸附能力相对原样较低 。The natural vanadiferous rutile was modified by heating, quenching and electron irradiation, and the different photoactivities of samples under different treatments were studied. XRD patterns of all samples reveal that all the treatments fail to result in new phases or any phase transition. In the IR spectra, there is a broad band at about 3400 cm -1 in non_modified, heating and quenching samples, which is attributed to the stretching vibrations of OH groups. The IR spectrum of the irradiated sample, however, shows no above_mentioned band. XPS (X_ray Photoelectron Spectroscopy) was used to study the change of chemical characteristics on the sample surfaces. The concentrations of oxygen and vanadium atoms increase with heating and quenching. This may be related to the increase of defects on the surface, which will add active sites for adsorption of water and hydroxyl groups. Accordingly, the photoactivities of these samples are distinctly improved. Unfortunately, electron irradiation fails to accelerate the photoactivity; on the contrary, it even somewhat slows down the process due to the reduction of adsorbed water and hydroxyl groups.

关 键 词：天然含钒金红石 淬火 加热 电子辐射 改性处理 物相 光催化活性 

分 类 号：P578.47[天文地球—矿物学]