共查询到18条相似文献,搜索用时 78 毫秒
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以四磺酸酞菁铜(CuPcTs)为敏化剂,玻璃和图案化的氧化铟锡(ITO)分别作为基底,制备了敏化薄膜TiO2-CuPcTs和ITO/TiO2-CuPcTs/ITO敏化器件.以罗丹明B(RhB)的可见光光催化降解为模型反应评价敏化薄膜的光催化性能.敏化薄膜采用UV-vis和Raman技术进行表征,同时利用敏化器件的结构特性,测定其在氮气和纯水体系下的光电流.研究结果表明,TiO2-CuPcTs可以有效地将光谱响应拓宽到可见光区,一级反应速率常数为空白TiO2薄膜的3.7倍.TiO2-CuPcTs薄膜光催化降解RhB的重复性能稳定.与ITO/TiO2/ITO器件相比,敏化器件ITO/TiO2-CuPcTs/ITO具有较高的光电流信号,验证了激发态的CuPcTs能够将电子转移到TiO导带上的敏化机理. 相似文献
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酞菁敏化混晶TiO2薄膜的低温制备及其对罗丹明B的催化降解 总被引:1,自引:0,他引:1
以四磺酸酞菁铜(CuPcTs)为敏化剂,采用溶胶-凝胶法制备了酞菁敏化的TiO2溶胶,经浸渍提拉成膜并室温晾干,制得CuPcTs-TiO2薄膜.采用XRD,UV-Vis和SEM等测试手段对薄膜样品进行了表征,并通过罗丹明B的降解考察了薄膜的可见光催化性能.结果表明,TiO2为锐钛矿-板钛矿-金红石混晶结构,CuPcTs-TiO2薄膜对罗丹明B降解具有较高的光催化活性.CuPcTs敏化能有效提高TiO2的可见光催化活性,但过多的CuPcTs会使催化活性降低.在可见光照射条件下,罗丹明B主要是先脱乙基生成罗丹明,然后再逐步被分解.CuPcTs-TiO2薄膜在经2~3次循环使用后,其光催化活性趋于稳定.CuPcTs可牢固地负载于TiO2薄膜中,从而保证了CuPcTs-TiO2薄膜重复使用的稳定性. 相似文献
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Ag3PO4光催化耦合微生物燃料电池去除罗丹明B 总被引:1,自引:0,他引:1
以硝酸银、磷酸钠为原料,一步沉淀法制备了Ag_3PO_4可见光光催化剂,用硅溶胶将其负载于不锈钢丝网上,经干燥得到光催化电极。以此光催化电极和碳棒分别作为阴极、阳极,在阳极室加入负载生物产电菌的活性炭颗粒,建立光催化耦合微生物燃料电池反应器。以罗丹明B(RhB)为模型污染物,考察了光照、底物浓度、pH值等对污染物去除效率与电池产电性能的影响。结果显示:在100 W卤素灯光照下、外接500Ω电阻、pH=10、微生物量1.5倍,反应4 h可去除92%的(50 mg·L-1、200 m L)RhB;此时电池输出电压和功率密度分别为124 m V、34.9 mW·m-2。5次重复实验表明该负载型光催化电极具有很好的稳定性。 相似文献
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以硝酸银、磷酸钠为原料,一步沉淀法制备了Ag3PO4可见光光催化剂,用硅溶胶将其负载于不锈钢丝网上,经干燥得到光催化电极。以此光催化电极和碳棒分别作为阴极、阳极,在阳极室加入负载生物产电菌的活性炭颗粒,建立光催化耦合微生物燃料电池反应器。以罗丹明B(RhB)为模型污染物,考察了光照、底物浓度、pH值等对污染物去除效率与电池产电性能的影响。结果显示:在100 W卤素灯光照下、外接500Ω电阻、pH=10、微生物量1.5倍,反应4 h可去除92%的(50 mg·L-1、200 mL)RhB;此时电池输出电压和功率密度分别为124 mV、34.9 mW·m-2。5次重复实验表明该负载型光催化电极具有很好的稳定性。 相似文献
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CuTSPc/SnO2纳米介孔复合材料的合成及其可见光光催化活性 总被引:4,自引:0,他引:4
采用无模板水热法,以四磺基酞菁铜(CuTSPc)敏化SnO2制备了CuTSPc/SnO2纳米介孔复合材料,通过X射线衍射、透射电镜、氮气吸附-脱附、紫外-可见光谱和傅里叶变换红外光谱等对复合材料进行了表征,并以罗丹明B (RhB)为目标降解物考察了其低功率(15 W光源)可见光光催化活性及循环使用性. 结果表明, CuTSPc周环的磺基与SnO2表面的锡离子形成双齿螯合, 0.1 mol% (CuTSPc与SnO2物质的量比) CuTSPc/SnO2复合材料的比表面积和平均孔径分别为236 m2/g和2.6 nm, 反应180 min时可见光降解率高达87%, 循环使用率较高(87%±5%). 相似文献
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苝染料敏化Pt/TiO2光催化分解水制氢 总被引:1,自引:0,他引:1
The photocatalyst (DPPBI/Pt/TiO2)was prepared using N,N’-di(4-pyridyl)-3,4,9,10-perylene tetracarboxylic acid bisimide (DPPBI) sensitized Pt/TiO2 and characterized by infrared spectroscopy(IR), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), scanning electron microscopy(SEM), X-ray photoelectron spectroscopy(XPS), and X-ray diffraction (XRD). The results of characterizationshowedthat the crystal form of TiO2was anatase, Ptwas highly dispersed on the surface of TiO2 and DPPBI was adsorbed on the surface of Pt/TiO2 in DPPBI/Pt/TiO2. Hydrogen production from water splitting using photocatalyst (DPPBI/Pt/TiO2) was studied. It has been found that the rate of hydrogen evolution reaches 6.69 滋 mol·h-1·g-1 under visible light irradiation for 8 h with 300 W Xe-lamp cold light source when 250 mL reactive liquid contains 0.8 g·L-1 photocatalyst (0.1%DPPBI/0.4%Pt/TiO2) and 0.2 mol·L-1 KI. 相似文献
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染料敏化是提升二硫化钼(MoS2)光催化制氢性能的一种有效手段。相较于单一敏化剂,共敏化可进一步拓展光吸收范围,提高催化剂的光催化效率,但目前尚无共敏化下MoS2光催化制氢的报道。本文在利用液相法制得MoS2的基础上,以藻红B钠盐(EB)和罗丹明B(RhB)为共敏化剂,测定了二者共敏化下MoS2的光催化制氢性能,重点研究了EB和RhB的加入比例和加入顺序对产氢性能的影响。结果发现当少量RhB与EB共存时,产氢性能得到一定程度的提升;EB、RhB分步加入时的性能优于一同加入且RhB先加入时的性能最佳。此外,结合紫外-可见吸收光谱、荧光光谱结果和两种染料分子的结构对染料共敏化提升MoS2光催化产氢性能的原因进行了初步分析。 相似文献
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SHANG Jing ZHAO FengWei ZHU Tong & LI Jia State Key Joint Laboratory of Environmental Simulation Pollution Control College of Environmental Sciences Engineering Peking University Beijing China 《中国科学B辑(英文版)》2011,(1)
Perylene tetracarboxylic diimide (PTCDI),widely used in organic photovoltaic devices,is an n-type semiconductor with strong absorption in the visible-light spectrum.There has been almost no study of the PTCDI-sensitized TiO2 composite used to photocatalytically degrade pollutants.In this study,PTCDIand copper phthalocyanine tetrasulfonic acid (CuPcTs)-sensitized TiO2 composites were prepared using a hydrothermal method.The morphologies and structures of the two composites were characterized by X-ray diffrac... 相似文献
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In this work, a new visible-light-responsive photocatalyst, mercury oxide (HgO) was successfully developed. Its activity is significantly higher than that of the highly efficient photocatalyst, Ag3PO4 in degradation of rhodamine B (RhB) dye under irradiation of visible light. The HgO photocatalyst can be reused for at least three cycles without obvious loss of its activity in the degradation experiments. It was found that the RhB degradation rate is significantly influenced by the dye solution pH. The ultrahigh photocatalytic activity of HgO is attributed to its strong oxidization-ablility of the photogenerated holes, and high separation-possibility of the photogenerated carriers. 相似文献
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Visible light induced photocatalytic reaction of rhodamine B dye via 12-tungstosilicic acid in water
Using 12-tungstosilicic acid (SiW124-) as the catalyst, rhodamine B (RhB) dye in an aerated aqueous solution can undergo an effective photocatalytic stepwise N-deethylation process under visible light irradiation, and dioxygen is reduced to hydrogen peroxide by the reducedSiW12 4-. This provides the potential for moving polyoxometalate-based photocatalytic processes from the near-UV into the visible region of the spectrum. 相似文献
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SUN ChengDong CHEN JianMing MA HuiMin LIU Yang ZHANG JingHua & LIU QingJun Beijing National Laboratory for Molecular Sciences Key Laboratory of Analytical Chemistry for Living Biosystems 《中国科学B辑(英文版)》2011,(7)
A new rhodamine derivative,N-(3-carboxy)acryloyl rhodamine B hydrazide(CARB),has been synthesized,and its unusual spectroscopic reaction with Cu2+ has been investigated.The derivative exhibits a rapid and reversible non-fluorescent absorption upon coordination to Cu2+,which is a rather unusual phenomenon for rhodamine B derivatives.Stoichiometric measurements using the Job's method and the molar ratio method reveal that one CARB molecule combines two Cu2+ ions,and the two Cu2+ ions play different roles:one ... 相似文献
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三价铁离子对TiO2 光催化降解X3B活性艳红染料具有明显的促进作用 .但是 ,当Fe(III)全部转化为Fe(II)离子以后 ,X3B的降解不再加快 .研究表明 ,Fe(III)捕获表面光生电子是导致X3B降解速率增加的主要原因 ,而Fe(III)光解产生羟基自由基使降解X3B的贡献则相对较小 .由于体系缺乏Fe(III) /Fe(II)循环 ,(Photo) Fenton反应参与X3B降解过程的可能性极小 .X3B和Fe(III)竞争吸附催化剂表面 ,促进了光生电子 -空穴对的分离和转移 .Fe(II)吸附相当微弱 ,这可能是导致Fe(II)难以被表面空穴或其它活性物质重新氧化的原因之一 相似文献
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Fatima Yahya Ghassan Younes 《International journal of environmental analytical chemistry》2013,93(14):1375-1396
ABSTRACTMesoporous silica aerogel/polyoxometalate hybrids were successfully synthesised under mild conditions, and were investigated towards photocatalytic degradation of Rhodamine B and Methylene Blue dye models in aqueous media under ultraviolet irradiation. The materials were characterised, in the solid state, by various tools such as FTIR, TGA, and powder XRD, in order to gather information about their chemical and structural properties. Moreover, UV-Vis, AAS, BET, SEM, and EDX techniques were used to confirm the polyoxometalates’ loading and their distribution onto the silica aerogels’ surface. The most important analytical technique was the Nitrogen adsorption-desorption, which revealed a significant increase in the specific surface area and pore volume of the hybrid catalysts after immobilisation. The synthesised hybrid catalysts, TEOS/PW12 and TEOS/SiW12, have shown efficient photocatalytic activity towards Methylene Blue and Rhodamine B degradation within 120 min under ultraviolet illumination, thus reaching a degradation percentage of 81–98% and 55–90%, respectively. UV-Vis analysis was employed to scrutinise the formation of intermediate species and revealed that the photocatalytic degradation process proceeded to completion within a surprisingly short time of ~5 min. 相似文献