Fe(Ⅲ)/rGO/Bi_2MoO_6复合光催化剂制备及光催化芬顿协同降解苯酚

光催化–芬顿技术耦合可高效降解有机污染物。本研究采用溶剂热法制备了Fe(Ⅲ)掺杂rGO/Bi_2Mo O_6复合催化剂(Fe(Ⅲ)/rGO/Bi_2Mo O_6),通过外加H_2O_2构建了光催化–芬顿协同体系,可见光照射3 h后对苯酚的降解率(82%)远高于单独光催化(18%)或芬顿反应(48%),进一步优化条件对苯酚可实现完全降解。这主要是通过Fe得失电子实现价态的转变,并以此作为桥梁实现光催化–芬顿的协同作用。同时石墨烯的优异导电性能不仅克服了光催化中光生电子空穴难以分离的问题,而且促进了Fe~(3+)/Fe~(2+)的循环反应,促使芬顿反应产生更多的羟基自由基(·OH),进一步提高了苯酚的降解效率。实验考察了Fe(Ⅲ)含量、催化剂投加量、H_2O_2含量以及p H等因素对协同降解效果的影响。淬灭实验证明·OH是协同降解体系中最主要的活性物种,·O_2~–和h~+对降解活性也会产生一定的影响,结合实验结果提出了Fe(Ⅲ)/rGO/Bi_2Mo O_6光催化–芬顿协同降解苯酚的机理。     

Bi2MoO6/BiVO4异质结光催化剂的制备及性能

本工作采用水热法+热处理法制备了Bi_2MoO_6/BiVO_4异质结复合光催化剂,并采用XRD、SEM、EDS-Mapping、XPS和UV-vis DRS对一系列样品进行了表征。结果表明:不同比例的Bi_2MoO_6异质复合BiVO_4均未改变BiVO_4的晶体结构,但由于二者之间形成了异质结结构,其结晶程度有所提高;与纯BiVO_4相比,复合光催化剂的光吸收边发生红移,对可见光的光响应范围扩大,Bi_2MoO_6与BiVO_4形成的异质结结构有利于提高光生电子-空穴的分离效率,从而表现出更高的光催化活性。当Bi_2MoO_6与BiVO_4的质量比为5%时,样品的光催化活性最高,光照50 min后对甲基橙的降解率为58%,分别是纯相BiVO_4和Bi_2MoO_6的2.3倍、2.8倍,样品重复稳定性好。通过活性基捕获实验,证明了甲基橙溶液降解过程中,羟基和空穴为主要活性物质。     

Bi2MoO6/WO3复合光催化材料的合成及其可见光催化性能

采用水热法成功制备了不同Bi2MoO6含量的Bi2MoO6/WO3复合光催化剂,利用XRD、SEM、UV-Vis、EIS和PL对样品进行了微观结构、形貌、光吸收特性、光谱响应和光电流的测试与表征,并考察了Bi2MoO6/WO3复合材料光催化分解水制氧的活性.结果表明,Bi2MoO6/WO3复合样品的光催化活性明显高于纯...     

Ti3C2-OH/Bi2WO6复合光催化剂的制备及光催化性能研究

以硝酸铋(Bi（NO₃）₃·5H₂O)为铋源、钨酸钠（Na₂WO₆·2H₂O）为钨源以及碱性碳化钛（Ti₃C₂-OH）为助催化剂,在CTAB的辅助作用下用简易的水热法成功地制备了具有光催化性能复合Ti₃C₂-OH/Bi₂WO₆光催化剂,在可见光（300 W氙灯）的照射下,以降解罗丹明B（RhB）染液来评估催化剂的光催化性能,并最终分析其降解机理。结果表明,纯相Bi₂WO₆在可见光照射20 min后,对污染物降解效率达到了60.8%,而负载助催化剂Ti₃C₂-OH后,复合物的光催化性能明显提高。具体的,当Ti₃C₂-OH负载量为20 mg时,复合催化剂20 mg-Ti₃C     

光降解苯酚用rGO/Mo@TiO2纳米复合材料的制备及性能表征

利用溶胶-凝胶法,制备了TiO₂和Mo@TiO₂纳米粒子。采用液相沉积法,将TiO₂和Mo@TiO₂纳米粒子沉积到GO上面,制备了rGO/TiO₂和rGO/Mo@TiO₂纳米复合材料。利用SEM、XRD、XPS、FT-IR和拉曼光谱分别对TiO₂、Mo@TiO₂、rGO/TiO₂和rGO/Mo@TiO₂样品的形貌、晶型结构、离子状态以及材料的复合情况进行了研究;利用紫外-可见分光光度计测定了样品的UV-Vis吸收光谱。结果表明,制备的所有样品中的TiO₂均为锐钛矿型,且GO大部分被还原成了rGO;Mo@TiO₂、rGO/TiO₂和rGO/Mo@TiO₂样品的UV-Vis吸收光谱谱带向可见光区域内明显移动,纳米复合材料可见光利用率得到明显提升;Mo和rGO的引入,使样品的Ti2p和Mo3d光谱强度降低,XPS光谱均发生了红移,从而导致TiO₂表面化学环境发生变化,特征峰向较高的结合能处偏移;SEM分析表明,rGO和TiO₂之间具有良好的相互作用,在rGO表面沉积Mo@TiO₂颗粒后,其形貌保持不变,形成了rGO/Mo@TiO₂纳米复合材料;rGO/Mo@TiO₂纳米复合材料的光催化活性最高,3 h对p-NP的降解率为84%,而TiO₂、rGO/TiO₂和Mo@TiO₂3 h对p-NP的降解率分别为26%,42%和61%。     

TiO2/Bi2WO6复合光催化剂的制备及光催化性能研究

TiO₂/Bi₂WO₆异质结是当前最具潜力的一种可见光响应半导体光催化剂。以富含缺陷的TiO2纳米带为基体,采用水热法,诱导Bi2WO6在基体缺陷位点进行异质生长,从而合成具有异质结构的TiO₂/Bi₂WO₆复合材料。利用XRD、SEM、UV-Vis等技术,分析了基体表面缺陷、Bi2WO6负载量对TiO₂/Bi₂WO₆复合材料微观结构和性能的影响。结果表明,在基体表面引入缺陷,可以使TiO₂/Bi₂WO₆复合材料在可见光下对有机污染物Rh B的降解速率提高约50%。Bi2WO6负载量为0.12时的TiO₂/Bi₂WO₆复合材料,在可见光下,辐照6 min后对Rh B的降解率达99.3%,辐照30 min后对MB的降解率达99.7%,辐照15 min后对TC-HCl的降解率达87.7%。     

BiOI/Zn-Bi2WO6异质结的构建及光催化降解磺基水杨酸研究

采用水热法制备了BiOI/Zn-Bi₂WO₆异质结光催化剂。X射线粉末衍射(XRD)分析其物相、扫描电镜(SEM-EDS)分析其形貌和元素组成、X射线光电子能谱(XPS)分析其表面物种的化学态、紫外-可见吸收光谱(UV-Vis)分析其对太阳光的利用率、光致发光光谱(PL)和电化学阻抗谱(EIS)分析光生载流子的分离情况等。结果表明：形成异质结后一方面使光催化剂的吸收边红移且吸收强度增加,提高了可见光谱的利用率;另一方面实现了光生空穴-电子的高效分离,所得光催化剂对磺基水杨酸表现出较好的光催化降解性能,120 min内降解率达到82%,且具有较好的稳定性。     

P(MMA-AN)/TiO2复合粒子的制备及光催化性能

采用原位乳液聚合方法制备了基于共价键结合的P(MMA-AN)/TiO2复合粒子,红外光谱和热失重分析结果表明P(MMA-AN)在TiO2表面接枝率为15.9%。以甲基橙溶液为目标污染物,研究了P(MMA-AN)/TiO2复合粒子和TiO2对甲基橙的吸附和光催化降解甲基橙溶液的性能,结果表明:两种粒子对甲基橙的吸附都很少;在相同时间内,P(MMA-AN)/TiO2复合粒子对甲基橙溶液的降解性能优于TiO2,紫外光照180 min后,P(MMA-AN)/TiO2复合粒子对甲基橙溶液的降解率达到了88%,而TiO2仅为74%。     

Synthesis and characterization of Bi2MoO6/MIL-101(Fe) as a novel composite with enhanced photocatalytic performance: Effect of water matrix and reaction mechanism

The integration of Bi₂MoO₆ with MIL-101(Fe) as a novel structure enhanced photocatalytic activity for RhB degradation. Bi₂MoO₆/MIL-101(Fe) composites were synthesized via the solvothermal procedure and characterized by XRD, EDX, FE-SEM, TEM, FT-IR, BET, TGA, UV–vis DRS, and PL. The optimal molar ratio Bi₂MoO₆:MIL-101(Fe) equal to 1:1 showed better photocatalytic activity than Bi₂MoO₆ and MIL-101(Fe) and other heterostructure composites. The effect of pH (5–9), reaction time (60–120 min), catalyst concentration (0.1–0.5 g/L), and dye concentration (10–20 ppm) were investigated on the removal performance of RhB by using central composite face-centered (CCF). In the optimal process factors where the [Catalyst]:0.4 g/L, [RhB]:20 ppm, pH: 6.5, irradiation time: 120 min, the RhB and TOC removal efficiency were 85% and 84.2%, respectively. The holes and superoxide radicals played a major role in the degradation of RhB. The addition of salt (NaCl, Na₂SO₄, and NaHCO₃) at different concentrations (100, 200, 400, and 800 ppm) revealed that the salts have an inhibitory role in the photocatalytic performance. At low concentrations of 100 ppm, the salts had a negative effect on removal efficiency (k_{Pure water} = 0.0155 min^?1, k_NaCl = 0.0075 min^?1, k_Na2SO4 = 0.0132 min^?1, k_NaHCO3 = 0.006 min^?1). Increasing the salt concentration to 800 ppm caused improved efficiency for NaCl (k_NaCl = 0.0141 min^?1), while for Na₂SO₄ this trend was decreasing (k_Na2SO4 = 0.011 min^?1), and for NaHCO₃ sharply diminished (k_NaHCO3 = 0.0026 min^?1).     

Modulation of Bi2MoO6‐Based Materials for Photocatalytic Water Splitting and Environmental Application: a Critical Review

Highly active photocatalysts driving chemical reactions are of paramount importance toward renewable energy substitutes and environmental protection. As a fascinating Aurivillius phase material, Bi₂MoO₆ has been the hotspot in photocatalytic applications due to its visible light absorption, nontoxicity, low cost, and high chemical durability. However, pure Bi₂MoO₆ suffers from low efficiency in separating photogenerated carriers, small surface area, and poor quantum yield, resulting in low photocatalytic activity. Various strategies, such as morphology control, doping/defect‐introduction, metal deposition, semiconductor combination, and surface modification with conjugative π structures, have been systematically explored to improve the photocatalytic activity of Bi₂MoO₆. To accelerate further developments of Bi₂MoO₆ in the field of photocatalysis, this comprehensive Review endeavors to summarize recent research progress for the construction of highly efficient Bi₂MoO₆‐based photocatalysts. Furthermore, benefiting from the enhanced photocatalytic activity of Bi₂MoO₆‐based materials, various photocatalytic applications including water splitting, pollutant removal, and disinfection of bacteria, were introduced and critically reviewed. Finally, the current challenges and prospects of Bi₂MoO₆ are pointed out. This comprehensive Review is expected to consolidate the existing fundamental theories of photocatalysis and pave a novel avenue to rationally design highly efficient Bi₂MoO₆‐based photocatalysts for environmental pollution control and green energy development.     

Ag3PO4/BigFe4O9复合催化剂的制备及其光催化性能

利用水热法成功地制备得到具有高效光催化活性的Ag3PO4/Bi2Fe4O9复合型光催化剂.使用X-射线多晶粉末衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)对样品进行表征,并以罗丹明B为目标降解物对其光催化性能进行研究.结果表明:样品是由纳米Ag3 PO4颗粒负载在片状四边形的Bi2Fe4O9表面组成的,当Ag3PO4的负载量为4wt％时,复合材料的光催化效果最好,在可见光(波长＞420nm)照射下,1.5h内对100mL浓度为10-5mol.L-1罗丹明B溶液的脱色率可达98.7％.     

三维介孔Bi_2WO_6光催化剂的制备及无机离子对其光催化活性的影响

以硝酸铋、钨酸铵为起始原料,采用水热法合成介孔Bi_2WO_6光催化剂,借助X射线粉末衍射(XRD)、固体紫外-可见吸收光谱(UV-Vis)、电子扫描电镜(FE-SEM)和透射电镜(TEM)对催化剂的物相组成、形貌和光吸收特性进行表征,并推测三维球状介孔Bi_2WO_6的形成机理;研究溶液pH值和环境水体中常见无机离子对Bi_2WO_6光催化降解亚甲基蓝的影响。结果表明:在强酸条件下,Bi_2WO_6表现出更高的光催化活性;环境水体中的无机离子对亚甲基蓝的光催化降解影响显著,阳离子如Fe~(3+),NH~+_4以及阴离子如卤素离子对其光催化降解具有很强的促进作用,Cu~(2+)和NO~-_2几乎无影响,而Fe~(2+)对其则具有明显抑制作用。     

氧缺陷Bi2WO6-x可见光催化剂的制备和性能

采用乙二醇溶剂热法原位制备氧缺陷Bi₂WO_6-x催化剂, 利用XRD、SEM、N₂吸附-脱附、XPS、ESR、UV-Vis DRS、PL及电化学方法对样品的理化性能进行了表征, 考察了样品在可见光下(λ > 400 nm)对气相苯的光催化降解性能。结果表明: 乙二醇溶剂热法制备的催化剂具有较大比表面积, 形成了Bi-O_v和W-O_v氧缺陷中心; 缺陷的生成改变了催化剂的能带结构, 缩小其光响应带隙宽度, 并有效抑制了光生电子-空穴对的复合, 催化剂的活性增强。Bi₂WO_6-x降解苯的转化率和矿化率分别为52.5%和80.6%, 是Bi₂WO₆的1.72倍和1.84倍。     

Fe3+-SiO2掺杂纳米TiO2的制备及其光催化降解甲基橙的研究

以三嵌段非离子表面活性剂P123为模板,采用水热法制备了Fe3+-SiPO2掺杂纳米TiO2,通过X射线衍射(XRD)、红外光谱(FT-IR)、紫外-可见吸收光谱(UV-Vis)等手段考察了Fe3+-SiO2掺杂纳米TiO2的结构与光学特性.实验结果表明:Fe3+、SiO2掺杂进入TiO2的晶格,可获得高纯度锐钛矿相纳米TiO2.Fe3+和SiO2的加入有助于抑制金红石相的形成和晶粒长大,提高了TiO2的热稳定性.Fe3+-SiO2掺杂将TiO2的光响应范围拓宽至可见光区,提高了纳米TiO2的光催化性能.与纯纳米TiO2相比,Fe3+-SiO2掺杂纳米TiO2光催化降解甲基橙的性能显著提高.