本文主要研究内容
作者乔静(2019)在《Ag2S和FeVO4作为导电通道增强Z型声催化剂活性的研究》一文中研究指出:近年来,光催化作为一种高级氧化技术(AOPs)以其矿化程度高、节能等优点被广泛研究对于有机污染物的处理。然而,实际的废水一般具有透明度低、浓度高等特点。因此,光催化技术不能有效的处理此类废水。据报道,半导体光催化剂与超声照射相结合的声催化降解技术具有穿透性强、设备简单和操作方便等特点,在该类废水处理中具有良好的可行性。与光催化技术类似,声催化技术表现出光催化剂与超声照射的协同效应,能有效地矿化难降解的有机污染物。然而,单个声催化剂显示高的电子和空穴复合率和低的光利用率,这限制了它在实际中的应用。Z型声催化体系的出现在一定程度上解决了这些问题。两种不同的半导体催化剂相结合构建的直接Z型声催化剂,它可以抑制两种不同的半导体各自的电子和空穴复合,拓宽光响应范围和增强氧化还原能力。此外,在Z型声催化体系中,一些贵金属、石墨烯和碳纳米管作为导电通道的使用可以加速电子传递,在一定程度上抑制光生电子和空穴的复合。然而,这些导电通道的使用会缺乏电子转移的驱动力和增加电子转移的距离。因此,本研究引入Ag2S和FeVO4作为导电通道来解决这些问题,从而提高声催化剂的声催化活性。第一部分研究中,我们通过使用超声辅助等电点法结合高温煅烧法成功制备了SrTiO3/Ag2S/CoWO4复合物。使用X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、紫外可见漫反射光谱(DRS)、能量色散X射线光谱(EDX)和X射线光电子能谱(XPS)对制备的样品晶型、表面形貌、带隙和化学组分进行表征。采用光致发光光谱(PL)研究半导体中电子和空穴的分离效果。在超声波照射下,通过降解四环素来评估SrTiO3/Ag2S/CoWO4复合物作为声催化剂的声催化活性。通过UV-vis分光光度计来测定四环素的降解程度。主要研究了超声照射时间、超声波功率、溶液pH、声催化剂加入量、四环素初始浓度、捕获剂和声催化剂循环次数对声催化降解四环素的影响。通过对不同种类四环素进行降解,考察了SrTiO3/Ag2S/CoWO4作为声催化剂对降解有机污染物的广谱性。根据形成的中间产物推测了四环素的声催化降解路线。实验结果表明,由于Ag2S作为梯形电子通道和助催化剂的存在加快了电子从CoWO4的导带到SrTiO3的价带的转移,提高了SrTiO3/Ag2S/CoWO4复合物声催化活性。因此,可以预测SrTiO3/Ag2S/CoWO4作为声催化剂在环境修复方面具有潜在的应用前景。第二部分研究中,我们采用超声辅助等电点法结合高温煅烧法制备了KTaO3/FeVO4/Bi2O3复合物。采用X射线粉末衍射(XRD)、能量色散X射线光谱(EDX)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、傅里叶转换红外光谱(FT-IR)、紫外可见漫反射光谱(DRS)和对制备的样品晶型、化学组成、结构、带隙和表面形态进行表征。采用光致发光光谱(PL)、瞬态光电流响应(TPR)和电化学阻抗(EIS)研究半导体中电子和空穴的分离效果。研究了KTaO3/FeVO4/Bi2O3作为声催化剂在超声照射下降解头孢曲松钠的声催化活性。研究了超声照射时间、捕获剂和声催化剂循环使用次数对头孢曲松钠声催化降解的影响。根据形成的中间产物推测了头孢曲松钠的降解路径。提出了KTaO3/FeVO4/Bi2O3作为声催化剂在头孢曲松钠降解过程中可能的机理。研究结果表明,制备的KTaO3/FeVO4/Bi2O3作为声催化剂在头孢曲松钠的声催化降解中表现出优异的催化活性。其原因可能是FeVO4作为导电通道,通过铁和钒的价态变化提供电子转移的驱动力,加速电子从Bi2O3的导带转移到KTaO3的价带。实验结果表明,KTaO3/FeVO4/Bi2O3作为一种优秀的Z型声催化剂,在超声照射下能有效的降解有机污染物。
Abstract
jin nian lai ,guang cui hua zuo wei yi chong gao ji yang hua ji shu (AOPs)yi ji kuang hua cheng du gao 、jie neng deng you dian bei an fan yan jiu dui yu you ji wu ran wu de chu li 。ran er ,shi ji de fei shui yi ban ju you tou ming du di 、nong du gao deng te dian 。yin ci ,guang cui hua ji shu bu neng you xiao de chu li ci lei fei shui 。ju bao dao ,ban dao ti guang cui hua ji yu chao sheng zhao she xiang jie ge de sheng cui hua jiang jie ji shu ju you chuan tou xing jiang 、she bei jian chan he cao zuo fang bian deng te dian ,zai gai lei fei shui chu li zhong ju you liang hao de ke hang xing 。yu guang cui hua ji shu lei shi ,sheng cui hua ji shu biao xian chu guang cui hua ji yu chao sheng zhao she de xie tong xiao ying ,neng you xiao de kuang hua nan jiang jie de you ji wu ran wu 。ran er ,chan ge sheng cui hua ji xian shi gao de dian zi he kong xue fu ge lv he di de guang li yong lv ,zhe xian zhi le ta zai shi ji zhong de ying yong 。Zxing sheng cui hua ti ji de chu xian zai yi ding cheng du shang jie jue le zhe xie wen ti 。liang chong bu tong de ban dao ti cui hua ji xiang jie ge gou jian de zhi jie Zxing sheng cui hua ji ,ta ke yi yi zhi liang chong bu tong de ban dao ti ge zi de dian zi he kong xue fu ge ,ta kuan guang xiang ying fan wei he zeng jiang yang hua hai yuan neng li 。ci wai ,zai Zxing sheng cui hua ti ji zhong ,yi xie gui jin shu 、dan mo xi he tan na mi guan zuo wei dao dian tong dao de shi yong ke yi jia su dian zi chuan di ,zai yi ding cheng du shang yi zhi guang sheng dian zi he kong xue de fu ge 。ran er ,zhe xie dao dian tong dao de shi yong hui que fa dian zi zhuai yi de qu dong li he zeng jia dian zi zhuai yi de ju li 。yin ci ,ben yan jiu yin ru Ag2She FeVO4zuo wei dao dian tong dao lai jie jue zhe xie wen ti ,cong er di gao sheng cui hua ji de sheng cui hua huo xing 。di yi bu fen yan jiu zhong ,wo men tong guo shi yong chao sheng fu zhu deng dian dian fa jie ge gao wen duan shao fa cheng gong zhi bei le SrTiO3/Ag2S/CoWO4fu ge wu 。shi yong Xshe xian fen mo yan she (XRD)、sao miao dian zi xian wei jing (SEM)、tou she dian zi xian wei jing (TEM)、zi wai ke jian man fan she guang pu (DRS)、neng liang se san Xshe xian guang pu (EDX)he Xshe xian guang dian zi neng pu (XPS)dui zhi bei de yang pin jing xing 、biao mian xing mao 、dai xi he hua xue zu fen jin hang biao zheng 。cai yong guang zhi fa guang guang pu (PL)yan jiu ban dao ti zhong dian zi he kong xue de fen li xiao guo 。zai chao sheng bo zhao she xia ,tong guo jiang jie si huan su lai ping gu SrTiO3/Ag2S/CoWO4fu ge wu zuo wei sheng cui hua ji de sheng cui hua huo xing 。tong guo UV-visfen guang guang du ji lai ce ding si huan su de jiang jie cheng du 。zhu yao yan jiu le chao sheng zhao she shi jian 、chao sheng bo gong lv 、rong ye pH、sheng cui hua ji jia ru liang 、si huan su chu shi nong du 、bu huo ji he sheng cui hua ji xun huan ci shu dui sheng cui hua jiang jie si huan su de ying xiang 。tong guo dui bu tong chong lei si huan su jin hang jiang jie ,kao cha le SrTiO3/Ag2S/CoWO4zuo wei sheng cui hua ji dui jiang jie you ji wu ran wu de an pu xing 。gen ju xing cheng de zhong jian chan wu tui ce le si huan su de sheng cui hua jiang jie lu xian 。shi yan jie guo biao ming ,you yu Ag2Szuo wei ti xing dian zi tong dao he zhu cui hua ji de cun zai jia kuai le dian zi cong CoWO4de dao dai dao SrTiO3de jia dai de zhuai yi ,di gao le SrTiO3/Ag2S/CoWO4fu ge wu sheng cui hua huo xing 。yin ci ,ke yi yu ce SrTiO3/Ag2S/CoWO4zuo wei sheng cui hua ji zai huan jing xiu fu fang mian ju you qian zai de ying yong qian jing 。di er bu fen yan jiu zhong ,wo men cai yong chao sheng fu zhu deng dian dian fa jie ge gao wen duan shao fa zhi bei le KTaO3/FeVO4/Bi2O3fu ge wu 。cai yong Xshe xian fen mo yan she (XRD)、neng liang se san Xshe xian guang pu (EDX)、Xshe xian guang dian zi neng pu (XPS)、sao miao dian zi xian wei jing (SEM)、tou she dian zi xian wei jing (TEM)、fu li xie zhuai huan gong wai guang pu (FT-IR)、zi wai ke jian man fan she guang pu (DRS)he dui zhi bei de yang pin jing xing 、hua xue zu cheng 、jie gou 、dai xi he biao mian xing tai jin hang biao zheng 。cai yong guang zhi fa guang guang pu (PL)、shun tai guang dian liu xiang ying (TPR)he dian hua xue zu kang (EIS)yan jiu ban dao ti zhong dian zi he kong xue de fen li xiao guo 。yan jiu le KTaO3/FeVO4/Bi2O3zuo wei sheng cui hua ji zai chao sheng zhao she xia jiang jie tou bao qu song na de sheng cui hua huo xing 。yan jiu le chao sheng zhao she shi jian 、bu huo ji he sheng cui hua ji xun huan shi yong ci shu dui tou bao qu song na sheng cui hua jiang jie de ying xiang 。gen ju xing cheng de zhong jian chan wu tui ce le tou bao qu song na de jiang jie lu jing 。di chu le KTaO3/FeVO4/Bi2O3zuo wei sheng cui hua ji zai tou bao qu song na jiang jie guo cheng zhong ke neng de ji li 。yan jiu jie guo biao ming ,zhi bei de KTaO3/FeVO4/Bi2O3zuo wei sheng cui hua ji zai tou bao qu song na de sheng cui hua jiang jie zhong biao xian chu you yi de cui hua huo xing 。ji yuan yin ke neng shi FeVO4zuo wei dao dian tong dao ,tong guo tie he fan de jia tai bian hua di gong dian zi zhuai yi de qu dong li ,jia su dian zi cong Bi2O3de dao dai zhuai yi dao KTaO3de jia dai 。shi yan jie guo biao ming ,KTaO3/FeVO4/Bi2O3zuo wei yi chong you xiu de Zxing sheng cui hua ji ,zai chao sheng zhao she xia neng you xiao de jiang jie you ji wu ran wu 。
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论文作者分别是来自辽宁大学的乔静,发表于刊物辽宁大学2019-09-05论文,是一篇关于改进的型催化体系论文,导电通道论文,电子转移驱动力论文,声催化降解论文,抗生素论文,辽宁大学2019-09-05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,资料来自辽宁大学2019-09-05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:改进的型催化体系论文; 导电通道论文; 电子转移驱动力论文; 声催化降解论文; 抗生素论文; 辽宁大学2019-09-05论文;