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existence form of lathanum and its improving mechanism of visible-light-driven La-F co-doped TiO2

Journal of Rare Earths 2020年第1期38卷 39-45页

作者： Ruifen Wang Shengli An Jing Zhang Jinling Song Fuming Wang School of Materials and Metallurgy Inner Mongolia University of Science and TechnologyBaotou 014010China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

The existence form and effect of La on the phase composition,morphology,recombination of photocarriers,and optical absorptivity of La-F codoped TiO2 were investigated.Experimental results indicate that all the phase composition of samples is anatase TiO2,the grain sizes decrease with the increasing of La content The catalysts have a well-defined spherical structure with an average size of 12-14 nm,and the doping elements are uniformly dispersed.Compared with pure TiO2,the absorption edge of La1.5F5-TiO2 red shifts from 388 to 437 nm,accordingly the energy gap(Eg) reduces from 32 to 2.84 eV,Besides,the recombination rate of electron-holes in La1.5F5-TiO2 is the weakest among the prepared samples,and the specific surface area of La1.5F5-TiO2 reaches 105.27 m2/g.The apparent reaction rate constant k of La1.5F5-TiO2 for methylene blue(MB) degradation under visible light obtained from the apparent first-order model achieves 0.0166±0.52 min-1,which is greater than 0.0033±0.09 min 1 of TiO2.Moreover,high-resolution transmission electron microscopy(HRTEM) observation reveals that there coexist La2O3 particles in the co-doped TiO2.

关键词： Photocatalysis La-F co-doping TiO2 existence form Visible light Rare earths

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A comparison study of existence forms of Fe species in coke for solution loss reaction of carbon

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Journal of Iron and Steel Research(International) 2018年第7期25卷 692-699页

作者： Qiang Ling Hui-juan Zhao Ling-yu Chen Rui-lun Xie Zhao Lei Zhi-gang Zhao Anhui Key Laboratory of Coal Clean Conversion and Utilization School of Chemistry and Chemical Engineering Anhui University of Technology Ma'anshan 243002 Anhui China

Fe species were loaded by two different loading ways （absorption method and addition method） to investigate their effect on thermal properties of coke. The particulate coke reactivity of coke samples indicated that the added sample showed higher catalytic activity than the adsorbed sample at first, owing to the decreased structure and properties of coke and more catalytic active sites caused by the strong interaction between Fe species and coke. The presence of Fe species in the added sample weakened the microstructure of coke, and the Fe species were easier to be reduced than those in the absorbed sample due to its different existence form in coke. With further increased loading of Fe species, the different existence positions of Fe species caused more decrease in surface active sites in the added sample than in the adsorbed sample, leading to lower catalytic activity of added sample when the total iron content exceeded 1%. The catalytic mechanism implied that there may be a catalytic dominant factor change in the reaction between the catalytic effect of iron species and carbon surface active sites in coke; the catalytic effect of iron species is dominant in the reaction at first, but the catalytic effect of carbon surface active sites is dominant in the reaction with the further increased loading amount of Fe species.

关键词： Coke reactivity Catalytic mechanism Coke structure Fe species existence form

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家庭教会的田野观察与思考

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宗教 2017年第6期 79-92页

作者：刘昭瑞

深圳市城市发展的特点，决定了深圳市家庭教会的生长和存在形态具有不同于其他一线城市家庭教会的特点。以深圳市中心区的六个具典型意义的家庭教会为田野对象，对其成长轨迹、生存状态、主要神学特征等进行分析，并对其独特性以及教内... 详细信息

深圳市城市发展的特点，决定了深圳市家庭教会的生长和存在形态具有不同于其他一线城市家庭教会的特点。以深圳市中心区的六个具典型意义的家庭教会为田野对象，对其成长轨迹、生存状态、主要神学特征等进行分析，并对其独特性以及教内人士的可能选择做了叙述和研究。作为新兴的一线城市，深圳市家庭教会的发展，很大程度上预示着基督教的某些发展趋势，值得长期跟踪。

关键词：家庭教会教派背景存在形态特点 house church background of religious sect existence form characteristics

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