本文主要研究内容
作者王颖（2019）在《具有特定晶面BiVO4的改性及光催化性能研究》一文中研究指出：半导体光催化技术能够有效地解决能源短缺和环境污染问题具有良好的应用前景。单斜相BiVO4由于禁带宽度较窄,能够响应可见光等被广泛应用在光催化方向,但其仍存在载流子易复合等缺点。本课题通过调控前驱液pH值等,制备出特定形貌的BiVO4。以特定晶面的BiVO4为基体,构建了g-C3N4/{010}晶面BiVO4界面Z-型异质结,Ag-BiVO4@RGO光催化剂和Ag-BiVO4-MnOx多级异质结光催化剂。提高了光催化剂光生载流子的分离率,增强了光催化剂在可见-近红外光下的光催化活性,提高了光催化剂对太阳能的利用率。主要结论如下:（1）研究了前驱液pH值对BiVO4形貌形成及生长机理的影响。前驱液中适量的H+会吸附在活性晶面上,能够降低高活性晶面的表面能,使活性晶面保持在最终的形态,暴露高活性晶面的单斜相BiVO4的形成是成核-Ostwald熟化生长机理。DFT理论计算表面,BiVO4的{010}和{110}晶面能够形成表面异质结。（2）研究了g-C3N4/{010}晶面BiVO4界面Z-型光催化剂生长机理及光催化机理。在BiVO4表面异质结的诱导下,光生电子向BiVO4的{010}晶面转移,使{010}晶面带有负电荷,g-C3N4带正电。g-C3N4和BiVO4的{010}晶面通过静电引力形成界面Z-型异质结。Z-型异质结不仅能够促进光生载流子的分离,而且保持强的氧化还原能力。所制光催化剂在可见光照30 min后对RhB的降解率能达到88.3%,其矿化能力能达到96.03%。（3）研究了RGO的TE（Transverse Electromagnetic）横电波和等离子体Ag的TM（Transverse Magnetic）横电波对光催化性能的影响。RGO表面等离激元的TE横电波使其能够吸收近红外光,等离子体Ag的SPR效应提高光催化剂对光的吸收能力。等离子体Ag纳米颗粒的SPR效应能够诱导高能载流子的产生,RGO表面等离激元TE横向电波产生的局域电场和等离子体Ag的TM横电波产生的局域磁场的共振效应能够增强Ag-BiVO4@RGO光催化剂在可见和近红外光下的光催化活性。（4）通过紫外光照法将氧化型助催化剂MnOx和还原型助催化剂金属Ag选择性地沉积在BiVO4的{110}和{010}晶面。在Ag-BiVO4-MnOx复合光催化剂中形成了三级界面异质结,即BiVO4的{010}和{110}晶面形成的表面异质结、金属Ag纳米颗粒与BiVO4{010}晶面形成的m-s异质结以及n型BiVO4和p型MnOx之间形成的p-n异质结,形成的多级界面异质结能够增强光生载流子的分离率,抑制其复合。
Abstract
ban dao ti guang cui hua ji shu neng gou you xiao de jie jue neng yuan duan que he huan jing wu ran wen ti ju you liang hao de ying yong qian jing 。chan xie xiang BiVO4you yu jin dai kuan du jiao zhai ,neng gou xiang ying ke jian guang deng bei an fan ying yong zai guang cui hua fang xiang ,dan ji reng cun zai zai liu zi yi fu ge deng que dian 。ben ke ti tong guo diao kong qian qu ye pHzhi deng ,zhi bei chu te ding xing mao de BiVO4。yi te ding jing mian de BiVO4wei ji ti ,gou jian le g-C3N4/{010}jing mian BiVO4jie mian Z-xing yi zhi jie ,Ag-BiVO4@RGOguang cui hua ji he Ag-BiVO4-MnOxduo ji yi zhi jie guang cui hua ji 。di gao le guang cui hua ji guang sheng zai liu zi de fen li lv ,zeng jiang le guang cui hua ji zai ke jian -jin gong wai guang xia de guang cui hua huo xing ,di gao le guang cui hua ji dui tai yang neng de li yong lv 。zhu yao jie lun ru xia :（1）yan jiu le qian qu ye pHzhi dui BiVO4xing mao xing cheng ji sheng chang ji li de ying xiang 。qian qu ye zhong kuo liang de H+hui xi fu zai huo xing jing mian shang ,neng gou jiang di gao huo xing jing mian de biao mian neng ,shi huo xing jing mian bao chi zai zui zhong de xing tai ,bao lou gao huo xing jing mian de chan xie xiang BiVO4de xing cheng shi cheng he -Ostwaldshou hua sheng chang ji li 。DFTli lun ji suan biao mian ,BiVO4de {010}he {110}jing mian neng gou xing cheng biao mian yi zhi jie 。（2）yan jiu le g-C3N4/{010}jing mian BiVO4jie mian Z-xing guang cui hua ji sheng chang ji li ji guang cui hua ji li 。zai BiVO4biao mian yi zhi jie de you dao xia ,guang sheng dian zi xiang BiVO4de {010}jing mian zhuai yi ,shi {010}jing mian dai you fu dian he ,g-C3N4dai zheng dian 。g-C3N4he BiVO4de {010}jing mian tong guo jing dian yin li xing cheng jie mian Z-xing yi zhi jie 。Z-xing yi zhi jie bu jin neng gou cu jin guang sheng zai liu zi de fen li ,er ju bao chi jiang de yang hua hai yuan neng li 。suo zhi guang cui hua ji zai ke jian guang zhao 30 minhou dui RhBde jiang jie lv neng da dao 88.3%,ji kuang hua neng li neng da dao 96.03%。（3）yan jiu le RGOde TE（Transverse Electromagnetic）heng dian bo he deng li zi ti Agde TM（Transverse Magnetic）heng dian bo dui guang cui hua xing neng de ying xiang 。RGObiao mian deng li ji yuan de TEheng dian bo shi ji neng gou xi shou jin gong wai guang ,deng li zi ti Agde SPRxiao ying di gao guang cui hua ji dui guang de xi shou neng li 。deng li zi ti Agna mi ke li de SPRxiao ying neng gou you dao gao neng zai liu zi de chan sheng ,RGObiao mian deng li ji yuan TEheng xiang dian bo chan sheng de ju yu dian chang he deng li zi ti Agde TMheng dian bo chan sheng de ju yu ci chang de gong zhen xiao ying neng gou zeng jiang Ag-BiVO4@RGOguang cui hua ji zai ke jian he jin gong wai guang xia de guang cui hua huo xing 。（4）tong guo zi wai guang zhao fa jiang yang hua xing zhu cui hua ji MnOxhe hai yuan xing zhu cui hua ji jin shu Agshua ze xing de chen ji zai BiVO4de {110}he {010}jing mian 。zai Ag-BiVO4-MnOxfu ge guang cui hua ji zhong xing cheng le san ji jie mian yi zhi jie ,ji BiVO4de {010}he {110}jing mian xing cheng de biao mian yi zhi jie 、jin shu Agna mi ke li yu BiVO4{010}jing mian xing cheng de m-syi zhi jie yi ji nxing BiVO4he pxing MnOxzhi jian xing cheng de p-nyi zhi jie ,xing cheng de duo ji jie mian yi zhi jie neng gou zeng jiang guang sheng zai liu zi de fen li lv ,yi zhi ji fu ge 。
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论文作者分别是来自陕西科技大学的王颖，发表于刊物陕西科技大学2019-07-15论文，是一篇关于表面异质结论文,型异质结论文,光催化论文,陕西科技大学2019-07-15论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自陕西科技大学2019-07-15论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：表面异质结论文; 型异质结论文; 光催化论文; 陕西科技大学2019-07-15论文;