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富含氧空位的Bi_(4)O_(5)Br_(2)超薄纳米片用于高效压电催化生成过氧化氢
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作者 蔡豪 陈芳 +4 位作者 胡程 葛伟怡 李彤 张晓磊 黄洪伟 《Chinese Journal of Catalysis》 SCIE CAS CSCD 2024年第2期123-132,共10页
过氧化氢是一种重要的化工原料,广泛应用于工业和生活中的多个领域.然而,目前工业上主要采用蒽醌法生产过氧化氢,该过程存在高污染和高能耗等问题.为解决上述问题,研发人员一直致力于开发新的、环保的过氧化氢生产方法.近年研究发现,压... 过氧化氢是一种重要的化工原料,广泛应用于工业和生活中的多个领域.然而,目前工业上主要采用蒽醌法生产过氧化氢,该过程存在高污染和高能耗等问题.为解决上述问题,研发人员一直致力于开发新的、环保的过氧化氢生产方法.近年研究发现,压电催化生产过氧化氢是一种有前途的过氧化氢生产策略,但较低的能量转换效率阻碍了其进一步应用.Bi_(4)O_(5)Br_(2)材料因具有独特的层状晶体结构,高的化学稳定性,良好的可见光吸收及合适的能带结构被认为是具有较好应用前景的光催化材料.虽然Bi_(4)O_(5)Br_(2)的非中心对称结构赋予其独特的压电性能,但该特性往往被研究者忽视,导致其压电潜力未被充分利用.特别是,关于缺陷工程如何影响Bi_(4)O_(5)Br_(2)的压电性能仍存在许多未知之处,需要深入挖掘和探明.本文通过调节水热过程中乙二醇和水溶剂的比例构建了含有不同浓度氧空位的超薄Bi_(4)O_(5)Br_(2)(≈5 nm)纳米片,并研究其在纯水体系中的压电催化生成过氧化氢性能.X射线粉末衍射和高分辨率透射电镜结果证明Bi_(4)O_(5)Br_(2)催化剂的成功合成;X射线光电子能谱和电子顺磁共振(EPR)结果证明氧空位的成功构建.不同气氛下的催化性能实验、活性物种EPR测试和捕获实验结果均表明,过氧化氢的生成主要通过氧还原反应,同时需要水氧化反应的协同作用.此外,旋转环盘电流测试和捕获实验结果进一步表明,过氧化氢的生成主要通过两步单电子的氧还原反应.同时,压电力显微镜和多物理场仿真软件有限元模拟结果表明,超薄结构和氧空位共同增强了所制样品的压电响应和压电电势,因此促进了压电诱导的电荷分离和转移,进而产生更大的压电电流响应和更小的电化学阻抗.差分电荷和Bader电荷研究结果表明,氧空位的存在增强了催化剂与氧气之间的电荷传输和相互作用.密度泛函理论计算结果表明,氧空位增强了催化剂对氧气的吸附和活化能力,并大幅降低反应过程的吉布斯自由能.具有最优氧空位浓度的Bi_(4)O_(5)Br_(2)超薄纳米片表现出很好的催化生成过氧化氢性能,在纯水体系中过氧化氢的生成速率为620μmol g^-(1)h^(-1)(是不含氧空位Bi_(4)O_(5)Br_(2)的2.54倍),在牺牲体系中的生成速率为2700μmol g^-(1)h^(-1),催化性能优于大多数已报道的压电催化剂.综上,本文揭示了Bi_(4)O_(5)Br_(2)作为新型压电催化剂在高效合成过氧化氢中的潜力,丰富了压电催化合成过氧化氢的材料体系,同时为探索缺陷工程和纳米结构协同增强材料压电催化活性提供了参考. 展开更多
关键词 bi_(4)o_(5)br_(2) 氧空位 超薄纳米片 压电催化 过氧化氢生成
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BC/Bi_(4)O_(5)Br_(2)耦合过一硫酸盐光催化处理渗滤液尾水
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作者 孙晓杰 王亚搏 +4 位作者 张木喜 谭知涵 李洁 张红霞 朱红祥 《桂林理工大学学报》 CAS 北大核心 2023年第4期695-702,共8页
采用超声辅助室温原位沉淀法合成BC/Bi_(4)O_(5)Br_(2)光催化剂,在可见光下对比了TiO_(2)体系、BC/Bi_(4)O_(5)Br_(2)体系以及BC/Bi_(4)O_(5)Br_(2)耦合过一硫酸盐(PMS)体系处理渗滤液尾水的效果。考察了BC/Bi_(4)O_(5)Br_(2)耦合PMS体... 采用超声辅助室温原位沉淀法合成BC/Bi_(4)O_(5)Br_(2)光催化剂,在可见光下对比了TiO_(2)体系、BC/Bi_(4)O_(5)Br_(2)体系以及BC/Bi_(4)O_(5)Br_(2)耦合过一硫酸盐(PMS)体系处理渗滤液尾水的效果。考察了BC/Bi_(4)O_(5)Br_(2)耦合PMS体系中PMS投加量和反应时间的影响,通过紫外可见光谱、三维荧光图谱分析渗滤液尾水有机物成分。结果表明:BC/Bi_(4)O_(5)Br_(2)耦合PMS体系对腐殖质的去除效果较另外两体系的效果优异,BC/Bi_(4)O_(5)Br_(2)对COD、腐殖质(A_(254))、色度(CN)的去除率分别为13.07%、12.74%、52.19%,BOD_(5)/COD从0.08提升至0.18。BC/Bi_(4)O_(5)Br_(2)耦合PMS体系中,0.1 g BC/Bi_(4)O_(5)Br_(2)耦合0.20 g PMS体系对渗滤液尾水有机物有良好的降解效果,尤其在反应开始的前0.5 h作用效果明显,1.5 h后降解效率不再明显增加。BC/Bi_(4)O_(5)Br_(2)耦合PMS体系对TOC的最大去除率为30.5%,较BC/Bi_(4)O_(5)Br_(2)体系提高16.5%;对腐殖质的最大去除率为53.97%,较BC/Bi_(4)O_(5)Br_(2)体系提升41.5%。紫外可见光谱、三维荧光图谱表明渗滤液尾水以类腐殖质为主。研究结果可为非均相耦合过一硫酸盐光催化处理渗滤液尾水提供一定参考。 展开更多
关键词 渗滤液尾水 bi_(4)o_(5)br_(2) 过一硫酸盐 光催化 生物炭
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S型异质结Bi_(4)O_(5)Br_(2)/CeO_(2)的制备及其光催化CO_(2)还原性能
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作者 李跃军 曹铁平 孙大伟 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2023年第8期963-970,共8页
光催化CO_(2)还原技术的关键是开发高效光催化剂,而构建具有紧密界面结构的异质结是增强界面电荷转移,实现高效光催化活性的有效途径。本研究采用静电纺丝技术结合水热法,将Bi_(4)O_(5)Br_(2)纳米片镶嵌在CeO_(2)纳米纤维表面,制得Bi_(4... 光催化CO_(2)还原技术的关键是开发高效光催化剂,而构建具有紧密界面结构的异质结是增强界面电荷转移,实现高效光催化活性的有效途径。本研究采用静电纺丝技术结合水热法,将Bi_(4)O_(5)Br_(2)纳米片镶嵌在CeO_(2)纳米纤维表面,制得Bi_(4)O_(5)Br_(2)/CeO_(2)纤维光催化材料(B@C-x,x对应反应物的加入量)。利用不同方法表征其微观结构、形貌和光电性能。结果表明,适当Bi_(4)O_(5)Br_(2)含量的Bi_(4)O_(5)Br_(2)/CeO_(2)异质结可以显著提高CeO_(2)纳米纤维的光催化性能。与纯Bi_(4)O_(5)Br_(2)和CeO_(2)相比,B@C-2在模拟太阳光下表现出最佳光催化活性,不使用任何牺牲剂或共催化剂的条件下,CO生成速率达到8.26μmol·h^(–1)·g^(–1)。这归因于Bi_(4)O_(5)Br_(2)和CeO_(2)之间的界面结合紧密以及构建的S型异质结,使得光生载流子可以实现有效的空间分离和转移。本研究为定向合成Bi基S型异质结复合光催化材料提供了一种简便有效的方法,为清洁能源转换探索了可行的途径。 展开更多
关键词 bi_(4)o_(5)br_(2)/Ceo_(2)复合纤维 异质结 光催化Co_(2)还原 水热法
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Bi_(4)O_(5)Br_(2)制备及其对罗丹明B的光催化降解性能
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作者 孙晓杰 张木喜 +3 位作者 王亚搏 谭知涵 王春莲 李洁 《桂林理工大学学报》 CAS 北大核心 2023年第1期116-122,共7页
采用室温原位沉淀法制备Bi_(4)O_(5)Br_(2),以罗丹明B(RhB)为目标污染物,研究所制备催化剂的可见光光催化性能。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱仪(XPS)、氮气吸附-脱附、瞬态光电流等对催化剂的结构、形... 采用室温原位沉淀法制备Bi_(4)O_(5)Br_(2),以罗丹明B(RhB)为目标污染物,研究所制备催化剂的可见光光催化性能。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱仪(XPS)、氮气吸附-脱附、瞬态光电流等对催化剂的结构、形貌、元素价态、比表面积和催化反应过程中光生载流子分离效率等进行表征分析。可见光照射时,样品产生了明显的光电流,说明样品具有可见光响应,催化剂合成成功并可应用于可见光催化反应。可见光照射30 min后,Bi_(4)O_(5)Br_(2)对20 mg/L RhB的去除率为89.76%,反应速率常数k值为0.069 min^(-1)。合成的催化剂Bi_(4)O_(5)Br_(2)由微纳米片状结构组成,存在纳米团簇现象。催化剂的孔径分布主要集中在5~10 nm,比表面积为32.52 m^(2)/g。Bi_(4)O_(5)Br_(2)禁带宽度值约为2.31 eV,载流子的平均寿命为40.44 ns。 展开更多
关键词 bi_(4)o_(5)br_(2) 室温原位沉淀法 罗丹明B 光催化降解
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Fabrication of g-C_(3)N_(4) nanosheet/Bi_(5)O_(7)Br/NH_(2)-MIL-88B(Fe)nanocomposites:Double S-scheme photocatalysts with impressive performance for the removal of antibiotics under visible light 被引量:2
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作者 Nasrin Sedaghati Aziz Habibi-Yangjeh Alireza Khataee 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2023年第7期1363-1374,共12页
Novel graphitic carbon nitride(g-C_(3)N_(4))nanosheet/Bi_(5)O_(7)Br/NH_(2)-MIL-88B(Fe)photocatalysts(denoted as GCN-NSh/Bi_(5)O_(7)Br/FeMOF,in which MOF is metal–organic framework)with double S-scheme heterojunctions... Novel graphitic carbon nitride(g-C_(3)N_(4))nanosheet/Bi_(5)O_(7)Br/NH_(2)-MIL-88B(Fe)photocatalysts(denoted as GCN-NSh/Bi_(5)O_(7)Br/FeMOF,in which MOF is metal–organic framework)with double S-scheme heterojunctions were synthesized by a facile solvothermal route.The resultant materials were examined by X-ray photoelectron spectrometer(XPS),X-ray diffraction(XRD),scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy(EDX),transmission electron microscopy(TEM),high-resolution transmission electron microscopy(HRTEM),photoluminescence spectroscopy(PL),Fourier transform infrared spectroscopy(FT-IR),UV-Vis diffuse reflection spectroscopy(UV-vis DRS),photocurrent density,electrochemical impedance spectroscopy(EIS),and Brunauer–Emmett–Teller(BET)analyses.After the integration of Fe-MOF with GCN-NSh/Bi_(5)O_(7)Br,the removal constant of tetracycline over the optimal GCN-NSh/Bi_(5)O_(7)Br/Fe-MOF(15wt%)nanocomposite was promoted 33 times compared with that of the pristine GCN.The GCN-NSh/Bi_(5)O_(7)Br/Fe-MOF(15wt%)nanocomposite showed superior photoactivity to azithromycin,metronidazole,and cephalexin removal that was 36.4,20.2,and 14.6 times higher than that of pure GCN,respectively.Radical quenching tests showed that·O_(2)-and h+mainly contributed to the elimination reaction.In addition,the nanocomposite maintained excellent activity after 4 successive cycles.Based on the developed n–n heterojunctions among n-GCN-NSh,n-Bi_(5)O_(7)Br,and n-Fe-MOF semiconductors,the double S-scheme charge transfer mechanism was proposed for the destruction of the selected antibiotics. 展开更多
关键词 g-C_(3)N_(4)nanosheet/bi_(5)o_(7)br/NH_(2)-MIL-88B(Fe) metal-organic framework double S-scheme heterojunctions ANTIbioTICS pho-tocatalytic performance
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高催化活性2D/2D Ti_(3)C_(2)/Bi_(4)O_(5)Br_(2)纳米片异质结的构建及其可见光催化去除NO 被引量:2
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作者 杨晓庆 杨华琳 +7 位作者 卢欢 丁皓璇 童妍心 饶斐 张鑫 申茜 高健智 朱刚强 《物理化学学报》 SCIE CAS CSCD 北大核心 2021年第10期150-158,共9页
本研究采用水热法构建出2D/2D Ti_(3)C_(2)/Bi_(4)O_(5)Br_(2)纳米异质结,在可见光下研究了该复合材料对NO的光催化去除能力。实验表明,15%Ti_(3)C_(2)/Bi_(4)O_(5)Br_(2)对NO的光催化去除效率相比纯Bi_(4)O_(5)Br_(2)显著提高:其降解... 本研究采用水热法构建出2D/2D Ti_(3)C_(2)/Bi_(4)O_(5)Br_(2)纳米异质结,在可见光下研究了该复合材料对NO的光催化去除能力。实验表明,15%Ti_(3)C_(2)/Bi_(4)O_(5)Br_(2)对NO的光催化去除效率相比纯Bi_(4)O_(5)Br_(2)显著提高:其降解效率达到57.6%,比Bi_(4)O_(5)Br_(2)高27.1%。同时,15%Ti_(3)C_(2)/Bi_(4)O_(5)Br_(2)具有很好的稳定性,经过5次循环催化,其催化率依然接近50.0%。研究发现,反应过程中主要的反应活性物质是e^(−)和·O_(2)^(−),光氧化产物主要为NO_(2)^(−)和NO_(3)^(−)。分析复合材料的光催化机制,发现光催化活性的提高主要得益于2D/2D Ti_(3)C_(2)/Bi_(4)O_(5)Br_(2)异质结提高了电子与空穴的分离率,从而提高了光催化效率。这项工作提供了一个制备2D/2D纳米复合材料用于光催化降解环境污染物的有效方法,在缓解能源紧张与环境污染方面有巨大应用潜力。 展开更多
关键词 Ti_(3)C_(2)/bi_(4)o_(5)br_(2) 2D/2D异质结 半导体 光催化剂 光催化降解 No去除
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Bi_(4)O_(5)Br_(2)/Ti_(3)C_(2)-Ru复合光催化剂的合成及其对磺胺甲噁唑药物废水降解性能研究 被引量:1
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作者 张雷 李瑞 樊彩梅 《人工晶体学报》 CAS 北大核心 2022年第7期1248-1256,共9页
Bi_(x)O_(y)Br_(z)光催化剂在有机药物废水处理领域有着非常广阔的潜在应用价值,但光生电子-空穴对的快速复合限制了其应用。本文选用具有优良电子传递性能的Ti_(3)C_(2)作为助催化剂,首先利用Ti_(3)C_(2)表面丰富的Ti空位缺陷和高还原... Bi_(x)O_(y)Br_(z)光催化剂在有机药物废水处理领域有着非常广阔的潜在应用价值,但光生电子-空穴对的快速复合限制了其应用。本文选用具有优良电子传递性能的Ti_(3)C_(2)作为助催化剂,首先利用Ti_(3)C_(2)表面丰富的Ti空位缺陷和高还原能力,制备了Ti_(3)C_(2)-Ru助催化剂,接着利用Ti_(3)C_(2)表面官能团与Bi^(3+)的离子键合力实现了Bi_(4)O_(5)Br_(2)在Ti_(3)C_(2)-Ru表面的原位生长,得到Bi_(4)O_(5)Br_(2)/Ti_(3)C_(2)-Ru复合光催化剂,从而实现了电子由Bi_(4)O_(5)Br_(2)到Ti_(3)C_(2)再到反应活性位点Ru的定向传递,最终使催化剂具有较高的光生载流子分离率和较低的界面电荷转移阻力,有效抑制了光生电子-空穴对的复合。同时以磺胺甲噁唑(SMX)为模拟药物污染物进行了光催化性能测试,结果表明所制备的Bi_(4)O_(5)Br_(2)/Ti_(3)C_(2)-Ru复合光催化剂展示出了优异的光催化降解SMX性能,在可见光下照射75 min,SMX的降解率达到95.1%,相较于纯的Bi_(4)O_(5)Br_(2)和Bi_(4)O_(5)Br_(2)/Ti_(3)C_(2)催化剂,其降解率分别提升了36.9个百分点和25.3个百分点。最后基于自由基捕获实验和催化剂能带结构分析提出了所制催化剂的降解机理。研究结果可为构建具有药物废水净化功能的光催化剂提供设计思路。 展开更多
关键词 bi_(4)o_(5)br_(2)/Ti_(3)C_(2)-Ru 复合光催化剂 磺胺甲噁唑 电子-空穴-分离效率 电子定向转移 光催化降解
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肖特基异质结Pt/Bi_(4)O_(5)Br_(2)的制备及其光催化性能研究 被引量:1
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作者 张小超 寇丽芳 +2 位作者 张珍 王韵芳 张长明 《河南师范大学学报(自然科学版)》 CAS 北大核心 2022年第4期36-43,共8页
以Bi_(4)O_(5)Br_(2)为前驱体,通过静电吸附辅助光还原法成功制备了低负载量(0.05%~0.50%,质量分数)且高分散Pt纳米粒子修饰Bi_(4)O_(5)Br_(2)光催化剂体系.对一系列Pt/Bi_(4)O_(5)Br_(2)样品进行了降解双酚A(BPA)活性测试,结果表明,0.2... 以Bi_(4)O_(5)Br_(2)为前驱体,通过静电吸附辅助光还原法成功制备了低负载量(0.05%~0.50%,质量分数)且高分散Pt纳米粒子修饰Bi_(4)O_(5)Br_(2)光催化剂体系.对一系列Pt/Bi_(4)O_(5)Br_(2)样品进行了降解双酚A(BPA)活性测试,结果表明,0.20%Pt/Bi_(4)O_(5)Br_(2)样品在模拟太阳光照射30 min对BPA的降解效率达96%,远高于单一Bi_(4)O_(5)Br_(2).通过一系列表征手段(XRD,SEM,TEM,XPS,UV-vis DRS,PL等)对催化剂的结构形貌、化学组分及光学性质进行了系统性研究.研究发现,0.20%Pt/Bi_(4)O_(5)Br_(2)复合物活性显著提高的主要原因归因于以下几点:第一,Pt作为电子捕获陷阱提高了光生电子-空穴的分离效率;第二,贵金属等离子共振效应提高其光利用效率;第三,Pt与Bi_(4)O_(5)Br_(2)构成肖特基异质结,提高了光生载流子利用率.此外,根据捕获剂实验证明光催化过程中主要的活性物种是h^(+)和·OH,并提出相应的反应机理,该结果为低含量贵金属修饰铋基材料提供一定的理论基础和指导意义. 展开更多
关键词 肖特基异质结 Pt/bi_(4)o_(5)br_(2) 光催化 双酚A
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适用于化学生物学专业物理化学课程的综合性实验:Bi_(4)O_(5)Br_(2)光催化降解卡马西平及产物的毒性评价
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作者 毛晓明 梁亚琴 李燕 《长治学院学报》 2021年第5期114-117,共4页
建立了一个包括Bi_(4)O_(5)Br_(2)光催化剂的制备及结构表征、活性测定和降解产物生物毒性评价的系统性物理化学综合实验。通过水解法制备了可见光响应光催化剂Bi_(4)O_(5)Br_(2),对其结构和光吸收性能进行了X射线粉末衍射(XRD)和固体紫... 建立了一个包括Bi_(4)O_(5)Br_(2)光催化剂的制备及结构表征、活性测定和降解产物生物毒性评价的系统性物理化学综合实验。通过水解法制备了可见光响应光催化剂Bi_(4)O_(5)Br_(2),对其结构和光吸收性能进行了X射线粉末衍射(XRD)和固体紫外-可见漫反射光谱(UV-vis DRS)表征,并测定了其对卡马西平的光催化氧化性能。考察了降解产物对蚕豆根尖细胞微核率的影响,评价了卡马西平降解产物的生物毒性。该综合实验实现了光催化技术、物理化学实验教学、生物毒性评价相关内容的结合,有利于提高化学生物学专业学生专业知识的交叉融合,也有利于提高学生的综合实验能力,对培养应用型、复合型人才具有重要意义。 展开更多
关键词 bi_(4)o_(5)br_(2)光催化剂 卡马西平 生物毒性评价 物理化学实验
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Bi_(4)O_(5)Br_(2)/BiOCl复合光催化剂的制备及其降解有机污染物的性能
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作者 罗时梓 肖逸帆 +1 位作者 丁婷婷 肖新颜 《青岛科技大学学报(自然科学版)》 CAS 2022年第2期14-19,共6页
采用水热法合成Bi_(4)O_(5)Br_(2)纳米片的基础上,利用聚乙烯吡咯烷酮(PVP)辅助水热法合成了Bi_(4)O_(5)Br_(2)/BiOCl复合光催化剂。通过X射线衍射光谱技术(XRD)、冷场发射扫描电子显微镜(SEM)、紫外-漫反射光谱(UV-vis DRS)、氮气吸-... 采用水热法合成Bi_(4)O_(5)Br_(2)纳米片的基础上,利用聚乙烯吡咯烷酮(PVP)辅助水热法合成了Bi_(4)O_(5)Br_(2)/BiOCl复合光催化剂。通过X射线衍射光谱技术(XRD)、冷场发射扫描电子显微镜(SEM)、紫外-漫反射光谱(UV-vis DRS)、氮气吸-脱附等温技术(BET)、光电流响应和电化学阻抗(EIS)等测试手段对所制备光催化剂的结构与性能进行了表征。分别以罗丹明B(RhB)和四环素(TC)为目标污染物评价催化剂的光催化活性。结果表明:Bi_(4)O_(5)Br_(2)与BiOCl复合后,大大增加了比表面积,提供了更多的活性位点,从而导致复合物的光催化活性显著提升。 展开更多
关键词 bi_(4)o_(5)br_(2)纳米片 bi_(4)o_(5)br_(2)/bioCl复合光催化剂 光催化降解 有机污染物
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Bi_(4)O_(5)Br_(2)光催化材料研究进展 被引量:1
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作者 蔡宇昂 曹壮 《工业催化》 CAS 2021年第12期13-18,共6页
光催化作为一种利用太阳能去除污染物使其无害化的技术得到了广泛研究和发展。综述了近年来Bi_(4)O_(5)Br_(2)光催化材料的研究进展,并介绍了Bi_(4)O_(5)Br_(2)光催化材料的优势及特点、催化原理和改性方法。指出改性后的Bi_(4)O_(5)Br_... 光催化作为一种利用太阳能去除污染物使其无害化的技术得到了广泛研究和发展。综述了近年来Bi_(4)O_(5)Br_(2)光催化材料的研究进展,并介绍了Bi_(4)O_(5)Br_(2)光催化材料的优势及特点、催化原理和改性方法。指出改性后的Bi_(4)O_(5)Br_(2)材料作为性能优良的光催化剂已经成为新的研究趋势,复合型Bi_(4)O_(5)Br_(2)材料具有很大的发展潜力。 展开更多
关键词 催化化学 光催化 bi_(4)o_(5)br_(2)催化剂 改性
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g-C_(3)N_(4)纳米片修饰Bi_(4)O_(5)I_(2)光催化剂降解罗丹明B
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作者 仵慧缘 郑楠 +2 位作者 王宇 董晓丽 张新欣 《大连工业大学学报》 CAS 北大核心 2022年第5期350-354,共5页
采用高温煅烧法制备了g-C_(3)N(CN)纳米片,用其修饰花球状Bi_(4)O_(5)I_(2)构建异质结光催化剂,通过SEM、XRD、DRS等表征方法研究了异质结材料的形貌、晶体结构及光学特征。将染料罗丹明B作为目标污染物,通过对其降解率来评价异质结材... 采用高温煅烧法制备了g-C_(3)N(CN)纳米片,用其修饰花球状Bi_(4)O_(5)I_(2)构建异质结光催化剂,通过SEM、XRD、DRS等表征方法研究了异质结材料的形貌、晶体结构及光学特征。将染料罗丹明B作为目标污染物,通过对其降解率来评价异质结材料的光催化性能。与g-C_(3)N_(4)相比,g-C_(3)N_(4)/Bi_(4)O_(5)I_(2)具有更广的可见光吸收范围和更高的光生载流子分离效率,显示出更优秀的光催化性能。g-C_(3)N_(4)质量分数为30%的复合样品CN-30/Bi_(4)O_(5)I_(2)光催化性能最佳,60 min内罗丹明B降解率可达到95%,且具有较高的稳定性。 展开更多
关键词 异质结 石墨氮化碳 碘氧化铋 光催化剂
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Enhanced photocatalytic N_(2) fixation using KNbO3/Bi_(4)O_(5)Br_(2) type Ⅱ heterojunction
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作者 Lin Yue Zhihao Zeng +6 位作者 Xujie Ren Shude Yuan Chuanqi Xia Xin Hu Leihong Zhao Lvchao Zhuang Yiming He 《Frontiers of Chemical Science and Engineering》 SCIE EI CSCD 2024年第6期85-97,共13页
The fabrication of heterojunction catalysts is an effective strategy to enhance charge separation efficiency,thus boosting the performance of photocatalysts.This work presents the synthesis and investigation of a nove... The fabrication of heterojunction catalysts is an effective strategy to enhance charge separation efficiency,thus boosting the performance of photocatalysts.This work presents the synthesis and investigation of a novel KNbO_(3)/Bi_(4)O_(5)Br_(2) heterostructure catalyst for photocatalytic N_(2)-to-NH_(3) conversion under light illumination.While morphology analysis revealed KNbO_(3) microcubes embedded within Bi_(4)O_(5)Br_(2) nanosheets,the composite exhibited no significant improvement in specific surface area or optical property compared to Bi_(4)O_(5)Br_(2) due to the relatively wide band gap and low surface area of KNbO_(3).The main contribution lies in the enhanced separation efficiency of photogenerated electrons and holes.Besides,the band structure analysis suggests that KNbO_(3) and Bi_(4)O_(5)Br_(2) exhibit suitable band potentials to form a type II heterojunction.Benefiting from the higher Fermi level of KNbO_(3) than Bi_(4)O_(5)Br_(2),the electron drift at the contact region thus occurs and leads to the formation of a built-in electric field with the direction from KNbO_(3) to Bi_(4)O_(5)Br_(2),accelerating electron migration and improving the operational efficiency of the photocatalysts.Consequently,the KNbO_(3)/Bi_(4)O_(5)Br_(2) catalyst shows an increased photoactivity,achieving an NH_(3) generation rate 1.78 and 1.58 times those of KNbO_(3) and Bi_(4)O_(5)Br_(2),respectively.This work may offer valuable insights for the design and synthesis of heterojunction composite photocatalysts. 展开更多
关键词 knbo_(3)/bi_(4)o_(5)br_(2) HETERoJUNCTIoN photocatalytic N_(2)fixation charge separation
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Enhanced photocatalytic performance of Bi_(2)O_(2)CO_(3)/Bi_(4)O_(5)Br_(2)/reduced graphene oxide Z-schemehe terojunction via a one-pot room-temperature synthesis
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作者 Xiaoge Wu Lei Yan +6 位作者 Rongrong Qin Qikai Zhang Wei Yang Xiaozhi Wang Yongcai Zhang Min Luo Jianhua Hou 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2024年第4期418-427,共10页
Bi_(2)O_(2)CO_(3)(BOC)/Bi_(4)O_5Br_(2)(BOB)/reduced graphene oxide(rGO)Z-scheme heterojunction with promising photocatalytic properties was synthesized via a facile one-pot room-temperature method.Ultra-thin nanosheet... Bi_(2)O_(2)CO_(3)(BOC)/Bi_(4)O_5Br_(2)(BOB)/reduced graphene oxide(rGO)Z-scheme heterojunction with promising photocatalytic properties was synthesized via a facile one-pot room-temperature method.Ultra-thin nanosheets of BOC and BOB were grown in situ on r GO.The formed 2D/2D direct Z-scheme heterojunction of BOC/BOB with oxygen vacancies(OVs)effectively leads to lower negative electron reduction potential of BOB as well as higher positive hole oxidation potential of BOC,showing improved reduction/oxidation ability.Particularly,rGO is an acceptor of the electrons from the conduction band of BOC.Its dual roles significantly improve the transfer performance of photo-induced charge carriers and accelerate their separation.With layered nanosheet structure,rich OVs,high specific surface area,and increased utilization efficiency of visible light,the multiple synergistic effects of BOC/BOB/rGO can achieve effective generation and separation of the electron-holes,thereby generating more·O_(2)^(-)and h^(+).The photocatalytic reduction efficiency of CO_(2)to CO(12.91μmol/(g·hr))is three times higher than that of BOC(4.18μmol/(g·hr)).Moreover,it also achieved almost 100%removal of Rhodamine B and cyanobacterial cells within 2 hours. 展开更多
关键词 bi_(2)o_(2)Co_(3) bi_(4)o_(5)br_(2) Reduced graphene oxide Z-scheme heterojunction Photocatalysis Co_(2)reduction
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Z-scheme Bi_(4)O_(5)Br_(2)/NH_(2)-MIL-125(Ti)heterojunctions enable exceptional visible photocatalytic degradation of organic pollutant
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作者 Feng Huang Muhammad Humayun +6 位作者 Gang Li Ting-Ting Fan Wen-Lin Wang Yu-Lin Cao Anton Nikiforov Chun-Dong Wang Jing Wang 《Rare Metals》 SCIE EI CAS CSCD 2024年第7期3161-3172,共12页
One key strategy to enhance photocatalytic performance is to improve the transfer and separation efficiency of photogenerated carriers by building optimized heterojunctions.Herein,novel Bi_(4)O_5Br_(2)/NH_(2)-MIL-125(... One key strategy to enhance photocatalytic performance is to improve the transfer and separation efficiency of photogenerated carriers by building optimized heterojunctions.Herein,novel Bi_(4)O_5Br_(2)/NH_(2)-MIL-125(Ti)Z-scheme heterojunctions are fabricated and used as photocatalysts for organic pollutant photodegradation.The NH_(2)-MIL-125(Ti)nanosheets are exfoliated via a self-developed alkali solution stripping approach and then uniformly decorated on Bi_(4)O_(5)Br_(2).The as-prepared Bi_(4)O_(5)Br_(2)/NH_(2)-MIL-125(Ti)presents more than 90%degradation of various pollutants,outperforming the counterpart individual ones.The various characterization results suggest that the enhanced degradation rate is due to the more intimate face-to-face interfacial contact of the lamellar Z-scheme heterojunction materials,in which the migration path of carriers from the material's interior to the surface can be reduced,in turn enhancing migration efficiency and separation capability significantly.A possible photocatalytic reaction mechanism is proposed based on the photoelectric behaviors,radical trapping experiments and liquid chromatography mass spectrometry analysis.This work promotes the development of new photocatalytic materials for heterojunctions with face-to-face interfacial contacts,as well as the effective purification of wastewater in environmental remediation. 展开更多
关键词 Z-scheme heterojunctions Photocatalysis Alkaline solution stripping bi_(4)o_(5)br_(2) NH_(2)-MIL-125(Ti)
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富Bi型Bi_(4)O_(5)Br_(2)/TiO_(2)复合纤维的高效光催化CO_(2)还原
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作者 李跃军 曹铁平 孙大伟 《复合材料学报》 EI CAS CSCD 北大核心 2023年第11期6251-6259,共9页
光催化CO_(2)还原技术既能实现节能减排,又能缓解能源短缺,符合当今绿色可持续发展的理念。本工作以静电纺丝技术制备的TiO_(2)纳米纤维为基质,结合水热还原法制备Bi@Bi_(4)O_(5)Br_(2)/TiO_(2)复合纤维。利用XRD、SEM、HRTEM、XPS、UV-... 光催化CO_(2)还原技术既能实现节能减排,又能缓解能源短缺,符合当今绿色可持续发展的理念。本工作以静电纺丝技术制备的TiO_(2)纳米纤维为基质,结合水热还原法制备Bi@Bi_(4)O_(5)Br_(2)/TiO_(2)复合纤维。利用XRD、SEM、HRTEM、XPS、UV-Vis和碳吸附等方法对其微观结构、形貌和光学性能进行表征。结果表明:TiO_(2)纳米纤维经Bi_(4)O_(5)Br_(2)复合后,光谱响应范围拓展到可见光区,光生电子还原能力增强,可以将CO_(2)还原成CH_(4)和CO;金属Bi的富集不仅能提高催化剂对酸性CO_(2)分子的吸附能力,增强CO_(2)转化效率,而且能改变光催化反应路径,并有醇类物质(CH_(3)OH)的生成。模拟太阳光照射3h,Bi@Bi_(4)O_(5)Br_(2)/TiO_(2)光催化CO_(2)还原生成CH_(4)、CO和CH_(3)OH的速率分别达到3.87、1.06和0.32μmol·h^(-1)·g^(-1)。本文为探索高效二氧化碳光还原催化剂提供了新的机会。 展开更多
关键词 bi bi_(4)o_(5)br_(2)/Tio_(2)复合纤维 光催化 Co_(2)还原 静电纺丝
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Enhanced photocatalytic performance of Bi_(4)O_(5)Br_(2)with threedimensionally ordered macroporous structure for phenol removal 被引量:1
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作者 Kunfeng Zhang Hongxia Chen +3 位作者 Wenbo Pei Hongxing Dai Junshan Li Yongfa Zhu 《Nano Research》 SCIE EI CSCD 2023年第7期8871-8881,共11页
Herein,a series of three-dimensionally ordered macroporous(3DOM)Bi_(4)O_(5)Br_(2)photocatalysts with different macropore sizes were successfully fabricated via a polymethyl methacrylate(PMMA)template method.The photoc... Herein,a series of three-dimensionally ordered macroporous(3DOM)Bi_(4)O_(5)Br_(2)photocatalysts with different macropore sizes were successfully fabricated via a polymethyl methacrylate(PMMA)template method.The photocatalytic activity for phenol degradation over 3DOM Bi_(4)O_(5)Br_(2)first increased and then decreased with the rise in macropore size.Specifically,3DOM Bi_(4)O_(5)Br_(2)-255(macropore diameter ca.170 nm)exhibits the best photocatalytic activity in the static system,which is about 4.5,7.3,and 11.9 times higher than those of bulk Bi_(4)O_(5)Br_(2),Bi_(2)WO_(6),and g-C_(3)N_(4),respectively.Meanwhile,high phenol conversion(75%)is also obtained over 3DOM Bi_(4)O_(5)Br_(2)-255 in the flow system under full spectrum irradiation.Furthermore,3DOM Bi_(4)O_(5)Br_(2)-255 also shows strong mineralization capacity owing to the downward shift of valance band position(0.15 V)as compared with Bi_(4)O_(5)Br_(2).Total organic carbon(TOC)removal rate over 3DOM Bi_(4)O_(5)Br_(2)-255(62%)is much higher than that of Bi_(4)O_(5)Br_(2)(17%).The enhancement in photocatalytic performance of 3DOM Bi_(4)O_(5)Br_(2)-255 is attributable to its better phenol adsorption,O_(2)activation,and charge separation and transfer abilities.This work combines the advantages of 3D structure and surface dangling bonds,providing new possibilities for designing highly efficient photocatalysts for pollutants removal. 展开更多
关键词 three-dimensionally ordered macroporous structure bi_(4)o_(5)br_(2) o_(2)activation PHoToCATALYSIS degradation
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Bi_(4)O_(5)Br_(2)光催化剂的制备及可见光降解卡马西平的活性研究 被引量:1
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作者 毛晓明 李敏 +1 位作者 刘晨 秦永燕 《化学通报》 CAS CSCD 北大核心 2021年第7期715-719,共5页
采用水解法合成了Bi_(4)O_(5)Br_(2)光催化剂,并通过XRD、SEM和DRS等手段对催化剂的结构、形貌和光吸收性质进行了表征。结果表明,催化剂呈不规则片状结构,其带隙能为2.1eV,价带电位EVB和导带电位ECB分别为2.61和0.51 eV。基于反应原理... 采用水解法合成了Bi_(4)O_(5)Br_(2)光催化剂,并通过XRD、SEM和DRS等手段对催化剂的结构、形貌和光吸收性质进行了表征。结果表明,催化剂呈不规则片状结构,其带隙能为2.1eV,价带电位EVB和导带电位ECB分别为2.61和0.51 eV。基于反应原理和表征结果,提出了催化剂形成机理。在可见光照射下,Bi_(4)O_(5)Br_(2)对卡马西平表现出高效的光催化氧化活性,光照120min后,卡马西平的降解率超过90%,反应动力学速率常数k达到0.018min^(-1)。捕获剂实验结果表明卡马西平降解过程中的主要活性物质是光生空穴(h^(+))和超氧自由基阴离子(·O^(-)_(2))。致畸作用实验结果表明,可见光照射120min后,卡马西平溶液基本上没有污染。此外,Bi_(4)O_(5)Br_(2)光催化剂在光催化降解卡马西平过程中表现出较高的化学稳定性和可重复性,表明其具有实际应用的潜力。 展开更多
关键词 bi_(4)o_(5)br_(2) 卡马西平 反应机理 致畸作用
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Green and efficient degradation of cefoperazone sodium by Bi_(4)O_(5)Br_(2) leading to the production of non-toxic products:Performance and degradation pathway 被引量:5
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作者 Yingying Chen Ruiping Li +5 位作者 Yan Gu Hailin Tian Yingping Huang Junsong Chen Yanfen Fang Changying Yang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2021年第2期203-215,共13页
Photocatalytic process represents a promising approach to overcome the pollution challenge associated with the antibiotics-containing wastewater.This study provides a green,efficient and novel approach to remove cepha... Photocatalytic process represents a promising approach to overcome the pollution challenge associated with the antibiotics-containing wastewater.This study provides a green,efficient and novel approach to remove cephalosporins,particularly cefoperazone sodium(CFP).Bi_(4)O_(5)Br_(2) was chosen for the first time to systematically study its degradation for CFP,including the analysis of material structure,degradation performance,the structure and toxicity of the transformation products,etc.The degradation rate results indicated that Bi_(4)O_(5)Br_(2) had an excellent catalytic activity leading to 78%CFP removal compared with the pure BiOBr(38%)within 120 min of visible light irradiation.In addition,the Bi_(4)O_(5)Br_(2) presents high stability and good organic carbon removal efficiency.The effects of the solution p H(3.12-8.75)on catalytic activity revealed that CFP was mainly photocatalyzed under acidic conditions and hydrolyzed under alkaline conditions.Combined with active species and degradation product identification,the photocatalytic degradation pathways of CFP by Bi_(4)O_(5)Br_(2) was proposed,including hydrolysis,oxidation,reduction and decarboxylation.Most importantly,the identified products were all hydrolysis rather than oxidation byproducts transformed from the intermediate ofβ-lactam bond cleavage in CFP molecule,quite different from the mostly previous studies.Furthermore,the final products were demonstrated to be less toxic through the toxicity analysis.Overall,this study illustrates the detailed mechanism of CFP degradation by Bi_(4)O_(5)Br_(2) and confirms Bi_(4)O_(5)Br_(2) to be a promising material for the photodegradation of CFP. 展开更多
关键词 bi_(4)o_(5)br_(2) Cefoperazone sodium Photocatalytic activity Degradation products
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Carbon quantum dots/Bi_(4)O_(5)Br_(2) photocatalyst with enhanced photodynamic therapy:killing of lung cancer(A549)cells in vitro 被引量:2
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作者 Bing He Hai-Yan Jin +6 位作者 Ya-Wen Wang Cai-Mei Fan Yun-Fang Wang Xiao-Chao Zhang Jian-Xin Liu Rui Li Jue-Wen Liu 《Rare Metals》 SCIE EI CAS CSCD 2022年第1期132-143,共12页
Inorganic photocatalysts have been regarded as a promising candidate in the domain of tumor photodynamic therapy(PDT)due to their inspirational photocatalytic activity.In this study,a Bi_(4)O_(5)Br_(2)photocatalyst wa... Inorganic photocatalysts have been regarded as a promising candidate in the domain of tumor photodynamic therapy(PDT)due to their inspirational photocatalytic activity.In this study,a Bi_(4)O_(5)Br_(2)photocatalyst was synthesized and it exhibited effective photo-killing activity of A549 cells(a human lung carcinoma epithelial cell line)in vitro.On this basis,we modified Bi_(4)O_(5)Br_(2)with carbon quantum dots(CQDs)via a hydrolysis method at room temperature,which resulted in an improved photo-killing effect of Bi_(4)O_(5)Br_(2)to A549 cells.The samples and the interaction between samples and cells were fully characterized.It has been found that the loading of CQDs on Bi_(4)O_(5)Br_(2)can reduce the hydration ratio,increase the cellular uptake and improve the photogenerated reactive oxygen species(ROS)as compared with pristine Bi_(4)O_(5)Br_(2).Electron spin resonance(ESR)analysis and radical-trapping experiments manifested that the ROS contributed to PDT may be·O^(2-)and ·OH.This study may provide a useful strategy to ameliorate the penetrability,cell compatibility and PDT effect upon cancer cells of other inorganic photocatalysts. 展开更多
关键词 CQDs/bi_(4)o_(5)br_(2) PHoToCATALYST PDT A549 cell Reactive oxygen species
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