不同结晶度Mn-N-TiO_2微球对可见光降解的影响
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- 英文论文题名：Different degree of crystallinity of Mn-N-TiO_2 for photodegration under visible-light irradiation
- 论文作者：邹明明 ; 冯璐 ; 杨明辉
- 英文论文作者：Mingming Zou ; Lu Feng ; Minghui Yang ; Dalian National Laboratory for Clean Energy
- 年：2016
- 作者机构：中国科学院大连化学物理研究所洁净能源国家实验室;
- 论文关键词：老化时间 ; 缺陷 ; 氨气氮化 ; 降解
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第二十七分会：光化学
- 语种：中文
- 分类号：TQ134.11
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第二十七分会 ; 光化学
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：2
- 文件大小：213k
- 原文格式：D
- 会议级别：全国
摘要
我们首次通过溶胶凝胶法和溶剂热法控制Mn掺杂TiO_2微球的结晶度和孔结构。通过氨气氮化法在Mn掺杂TiO_2样品表面引入缺陷,从而在氮化改性的同时,降低Mn-N-TiO_2结晶度。固体紫外测试结果表明,在同样温度下,结晶度低的样品更容易被氮化。如Fig.1所示,溶剂热后的不同老化时间对表面活性剂与金属盐键合能力有一定影响。因此在煅烧处理之后,Mn掺杂TiO_2呈现了不同的结构特征。特别地是,对老化时间较长的Mn掺杂TiO_2进行煅烧处理后,表面活性剂与金属盐键合后并没有被去除,表面呈现光滑结构。氨气氮化处理1后,金属盐键暴露,增加了材料表面疏水性(反应溶液中分散性好)和吸附能力(对降解物有吸附作用)。因此,在相同条件下,溶剂热后老化时间长的Mn-N-TiO_2微球样品具有表面光滑,不定形2,疏水和吸附性能强,容易被氮化等特点。因此,降解能力大幅度提升。
A simple process for preparing Mn doped TiO_2 microspheres by sol-gel and solvothermal method that the degree of crystallity and the structure of pore should be modulated. The surface defect of Mn-TiO_2 sample will be induced by ammonia gas treatment. In the process of modified property, the crystallinity of Mn-N-TiO_2 decreased. The UV–Vis Diffuse Reflectance Spectra show that the low crystallinity samples could be nitrided easily under the same conditions. As shown in Fig. 1, different aging times have some effect on bonding ability between surfactant and metal salt. So Mn doped TiO_2 samples give different structures by calcination treatment. Specially, the surfactants have not been removed by calcination, Mn-TiO_2 sample with long aging time show a smooth surface. Under the treatment by ammonia gas, metal salt bond exposed, the surface hydrophobic and the adsorptive properties increased. Generally speaking, under the same condition, the Mn-N-TiO_2 microsphere samples show smooth surface, amorphous, hydrophobic, high adsorptive property and easily doped by N element. Finally, the abillity of degration significantly increase.
A simple process for preparing Mn doped TiO_2 microspheres by sol-gel and solvothermal method that the degree of crystallity and the structure of pore should be modulated. The surface defect of Mn-TiO_2 sample will be induced by ammonia gas treatment. In the process of modified property, the crystallinity of Mn-N-TiO_2 decreased. The UV–Vis Diffuse Reflectance Spectra show that the low crystallinity samples could be nitrided easily under the same conditions. As shown in Fig. 1, different aging times have some effect on bonding ability between surfactant and metal salt. So Mn doped TiO_2 samples give different structures by calcination treatment. Specially, the surfactants have not been removed by calcination, Mn-TiO_2 sample with long aging time show a smooth surface. Under the treatment by ammonia gas, metal salt bond exposed, the surface hydrophobic and the adsorptive properties increased. Generally speaking, under the same condition, the Mn-N-TiO_2 microsphere samples show smooth surface, amorphous, hydrophobic, high adsorptive property and easily doped by N element. Finally, the abillity of degration significantly increase.
引文
1.Dong,J.Y.;Han,J.;Liu,Y.S.;Nakajima,A.;Matsushita,S.;Wei,S.H.;Gao,W.,Defective Black Ti O2 Synthesized via Anodization for Visible-Light Photocatalysis.ACS Appl.Mat.Interfaces 2014,6,1385-1388.
2.Randorn,C.;Irvine,J.T.S.;Robertson,P.,Synthesis of visible-light-activated yellow amorphous Ti O(2)photocatalyst.Int.J.Photoenergy 2008.
2.Randorn,C.;Irvine,J.T.S.;Robertson,P.,Synthesis of visible-light-activated yellow amorphous Ti O(2)photocatalyst.Int.J.Photoenergy 2008.