无模板剂的溶胶-水热法合成具有可见光响应的氮掺杂混晶TiO_2(锐钛矿/金红石/板钛矿)纳米棒束（英文）

采用无模板剂的溶胶-水热法制备了具有可见光响应的N掺杂锐钛矿/金红石/板钛矿型TiO_2(N-TiO_2)纳米棒束,并利用X射线衍射(XRD)、透射电镜(TEM)、紫外-可见光漫反射光谱(UV-Vis DRS)、傅里叶变换红外光谱(FTIR)和X射线光电子能谱(XPS)等手段对获得的样品进行了表征。以甲基橙为模型反应物,评价了N-TiO_2纳米棒束的光催化活性。表征结果结合光催化活性评价结果显示,与P25-TiO_2相比,N掺杂、混晶及纳米棒束之间的协同作用是所制备的混晶N-TiO_2纳米棒束具有良好光催化活性的主要原因,并对混晶N-TiO_2纳米棒束光催化降解甲基橙的机理进行了探讨。     

N掺杂TiO2薄膜光催化性能的研究

采用溶胶-凝胶法,以Ti(OC4H9)4和氨水等为原料制备纯二氧化钛、N掺杂以及N,Zn2+共掺杂的二氧化钛光催化薄膜.用X射线衍射和X光电子能谱等对薄膜进行了表征,紫外光和可见光下催化剂降解甲基橙溶液的实验结果表明,掺杂TiO2薄膜比无掺杂TiO2薄膜的光催化效率明显提高,并且可见光下对甲基橙溶液有一定的光催化活性,但Zn2+的存在对掺杂薄膜的光催化效率没有显著改善.分析原因可能是N掺杂在价带和导带之间形成了缺陷能级,减小了TiO2的禁带能隙,从而使TiO2的吸收带发生红移,实现可见光响应.     

TiO_2/多孔g-C_3N_4纳米复合材料制备及性能研究

以硫酸钛为钛源,采用水热法成功制备了TiO_2纳米颗粒均匀负载于多孔g-C3N4表面的复合光催化材料。利用X射线衍射(XRD)、红外光谱(FT-IR)、扫描电子显微镜(SEM)、透射电子显微镜(TEM),紫外-可见漫反射(DRS)和荧光光谱(PL)等手段对样品进行表征,并以甲基橙为目标分解物考察了样品的可见光催化活性。结果表明:质子化作用是形成多孔结构的主要原因,且多孔性与Ti(SO4)2浓度高度相关。多孔结构的产生显著提高了复合材料对甲基橙的吸附能力。另一方面,TiO_2在g-C3N4表面原位形核生长,形成纳米结,光生电子-空穴对可通过纳米结有效分离,从而提高复合材料量子效率,增强光催化活性。不过,负载TiO_2后,复合材料的可见光响应特性有所降低。综合来看,当TiO_2与g-C3N4摩尔比为1/3时,所得复合材料光催化活性最强,降解甲基橙的一级反应速率常数为单一g-C3N4的11.1倍。     

N掺杂TiO2薄膜光催化性能的研究

采用溶胶-凝胶法，以Ti（OC4H9）4和氨水等为原料制备纯二氧化钛、N掺杂以及N，Zn^2＋共掺杂的二氧化钛光催化薄膜。用X射线衍射和X光电子能谱等对薄膜进行了表征，紫外光和可见光下催化剂降解甲基橙溶液的实验结果表明，掺杂TiO2薄膜比无掺杂TiO2薄膜的光催化效率明显提高，并且可见光下对甲基橙溶液有一定的光催化活性，但Zn^2＋的存在对掺杂薄膜的光催化效率没有显著改善。分析原因可能是N掺杂在价带和导带之间形成了缺陷能级，减小了TiO2的禁带能隙，从而使TiO2的吸收带发生红移，实现可见光响应。     

水热制备TiO2纳米管及其光催化性能

本文利用TiO₂粉体在高浓度NaOH溶液中水热反应制备TiO₂纳米管,采用X射线衍射(XRD)、扫描电镜(SEM),透射电镜(TEM),紫外可见分光光度计(UV-Vis)考察了NaOH浓度、水热反应温度、水热反应时间等因素对TiO₂纳米管结构和性能的影响。结果表明：当NaOH浓度为10mol/L,水热反应温度为160℃,水热反应时间20h时,所制备的TiO₂纳米管显示出较高的光催化活性,经紫外光照30min后,对甲基橙(MO)的降解率可达75.48%。     

B/Fe2O3共掺杂纳米TiO2可见光下的催化性能

采用溶胶凝胶法制备B/Fe2O3共掺杂TiO2复合光催化材料,并用X射线衍射仪(XRD)、扫描电镜(TEM)和紫外可见漫反射光谱(DRS)对粉体进行表征。结果表明:催化剂以锐钛矿存在的纳米颗粒,直观地显示了物质的形貌,掺杂B能极大提高催化剂的可见光响应。以二氯苯酚(DCP)为降解物质,在紫外和可见光下分别研究了复合催化剂的光催化活性。掺杂B能使吸收光谱红移至可见光区,而进一步掺杂Fe2O3大大提高了催化剂的活性。     

掺铜二氧化钛纳米颗粒的制备及其催化性能（英文）

采用溶胶-凝胶法制备掺铜量为0~2.0%(摩尔分数)的二氧化钛纳米颗粒。应用X射线衍射(XRD)、X射线光电子能谱(XPS)和场发射电子显微镜(FE-SEM)技术对二氧化钛纳米颗粒的晶体结构、化学价态和形貌进行表征。样品的光学吸收性能用紫外-可见吸收光谱进行表征;其光催化性能通过在紫外-可见光照射下分解20 mg/L甲基橙溶液进行表征。结果表明,掺铜二氧化钛纳米颗粒具有比纯二氧化钛更优的光催化性能,尤其是铜掺杂量为1.0%的二氧化钛TiO2纳米颗粒具有最好的光催化性能。铜掺杂能提高二氧化钛在紫外-可见光区对光的吸收、减小电子-空穴对的复合,因此,铜掺杂使二氧化钛的光催化性能得到提高。     

N-doped TiO2 nanotube arrays: Synthesis by anodic oxidation in an Ionic Liquid ([BMIM]BF4) and Assessment of Photocatalytic Properties

本文简述了以HF水溶液为电解液,离子液体（1-丁基-3-甲基咪唑四氟硼酸盐 [BMIM]BF4）为N源,采用阳极氧化法制备N掺杂TiO2纳米管阵列。通过扫描电子显微镜(SEM)、X射线衍射光谱(XRD)、X射线光电子能谱（XPS）、傅里叶变换红外光谱（FT-IR）和紫外-可见漫反射光谱（DRS）对N掺杂TiO2纳米管阵列的表面形貌、晶型和氮元素的掺杂方式进行分析。以球形氙灯为光源,亚甲基蓝溶液为目标物质测试N掺杂TiO2纳米管阵列的光催化活性。N掺杂TiO2纳米管阵列对亚甲基蓝溶液的降解率明显高于未掺杂的TiO2纳米管阵列。这是因为N掺杂后产生杂质能级使禁带宽度变窄,并且N掺杂进入TiO2晶格中形成O-Ti-N 键和Ti- O-N键,使氧空位数量增加,从而使光催化活性提高。     

氮掺杂纳米TiO_2负载活性炭纤维的制备及光催化性能（英文）

采用溶胶-凝胶法制备氮掺杂纳米TiO_2负载活性炭纤维光催化复合材料(N-TiO_2/ACF)。用X射线衍射、扫描电子显微镜和紫外漫反射光谱表征N-TiO_2/ACF的晶相组织和纤维结构;以真丝绸染色废水降解效果评价其光催化活性。结果表明:当煅烧温度为773K时,所制复合材料中N-TiO_2晶粒呈锐钛矿相,粒径约为15.3nm,且均匀分布在ACF表面,其吸收边带红移至569nm。金卤灯照射下反应180min,2.31gN-TiO_2/ACF对200mL浓度为5mg/L的真丝绸染色废水的COD去除率达80.6%。     

离子液体辅助阳极氧化法制备N掺杂TiO_2纳米管阵列及其光催化性能研究（英文）

以HF水溶液为电解液,离子液体(1-丁基-3-甲基咪唑四氟硼酸盐[BMIM]BF_4)为N源,采用阳极氧化法制备N掺杂TiO_2纳米管阵列。通过扫描电子显微镜(SEM)、X射线衍射(XRD)、X射线光电子谱(XPS)、傅里叶变换红外光谱(FT-IR)和紫外-可见漫反射光谱(DRS)对N掺杂TiO_2纳米管阵列的表面形貌、晶型和氮元素的掺杂方式进行分析。以球形氙灯为光源,亚甲基蓝溶液为目标降解物测试N掺杂TiO_2纳米管阵列的光催化活性。结果表明,N掺杂TiO_2纳米管阵列对亚甲基蓝溶液的降解率明显高于未掺杂的TiO_2纳米管阵列。这是因为N掺杂后不仅使TiO_2禁带宽度变窄,并且N掺杂进入TiO_2晶格中形成O-Ti-N键和Ti-O-N键,使氧空位数量增加,从而使其光催化活性提高。     

Low-temperature synthesis of N-TiO2 sol and characterization of N-TiO2 coating on cotton fabrics

To extend the application of N-TiO₂ to substrates with low thermal resistance, N-TiO₂ sol has been successfully synthesized at low temperature by reflux method and N-TiO₂ coating on cotton fabrics has been successfully prepared in a dip-coating process. Several characterization tools, such as X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV–vis diffuse reflectance spectroscopy, were employed to study the phase structures, morphologies, the chemical states and optical properties of the samples. The photocatalytic properties of the prepared products were measured with the degradation of methyl orange at room temperature under visible light irradiation. In comparison with TiO₂-cotton, the remarkable enhancement in the visible light photocatalytic performance of the N-TiO₂-cotton could be attributed to the existence of N-TiO₂ with narrow band gap. The photocatalytic performances of the N-TiO₂-cotton were maintained for the cycling experiments, indicating that N-TiO₂-cotton could be used as stable and efficient visible-light-induced self-cleaning materials.     

Modification of TiO2 nanorods by Bi2MoO6 nanoparticles for high performance visible-light photocatalysis

In this work, TiO₂ nanorods were prepared by a hydrothermal process and then Bi₂MoO₆ nanoparticles were deposited onto the TiO₂ nanorods by a solvothermal process. The nanostructured Bi₂MoO₆/TiO₂ composites were extensively characterized by X-ray diffraction, scanning and transmission electron microscopy, X-ray photoelectron spectroscopy and UV-vis diffuse reflectance spectroscopy. The photocatalytic activity of the Bi₂MoO₆/TiO₂ composites was evaluated by degradation of methylene blue. The Bi₂MoO₆/TiO₂ composites exhibit higher catalytic activity than pure Bi₂MoO₆ and TiO₂ for degradation of methylene blue under visible light irradiation (λ > 420 nm). Further investigation revealed that the ratio of Bi₂MoO₆ to TiO₂ in the composites greatly influenced their photocatalytic activity. The experimental results indicated that the composite with Bi₂MoO₆:TiO₂ = 1:3 exhibited the highest photocatalytic activity. The enhancement mechanism of the composite catalysts was also discussed.     

Characteristics of N-doped TiO2 nanotube arrays by N2-plasma for visible light-driven photocatalysis

N-doped TiO₂ nanotube arrays were prepared by electrochemical anode oxidation of Ti foil followed by treatment with N₂-plasma and subsequent annealed under Ar atmosphere. The morphologies, composition and optical properties of N-doped TiO₂ nanotube arrays were characterized using field-emission scanning electron microscope (FE-SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction spectrometer (XRD), Photoluminescence (PL) and UV-vis diffusion reflection spectroscopy (UV-vis DRS). Methylene blue (MB) solution was utilized as the degradation model to evaluate the photocatalytic activity of the samples under visible light irradiation. The results suggested N₂-plasma treatment created doping of nitrogen onto the surface of photoelectrodes successfully and the N-doped TiO₂ nanotube arrays display a significantly enhancement of the photocatalytic activity comparing with the pure TiO₂ nanotube arrays under the visible light irradiation.     

Photogenerated cathodic protection of flower-like, nanostructured, N-doped TiO2 film on stainless steel

Flower-like, nanostructured, N-doped TiO₂ (N-TiO₂) films were fabricated using a low-temperature hydrothermal method. The morphology, crystalline phase, and composition of these flower-like nanostructured films were characterized systematically by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and UV-vis spectroscopy. The photoelectrochemical properties of N-TiO₂ films in 0.5 M NaCl solution were evaluated under illumination and in the dark through electrochemical measurements. Flower-like nanostructured TiO₂ films exhibited a drastically enhanced photocurrent in the UV light region and a notable absorption in the visible light region (600-700 nm). The negative shifts of the electrode potentials of 316L stainless steel coupled with N-doped TiO₂ photoanodes are 470 and 180 mV under UV and visible light irradiation, respectively. The flower-like, nanostructured, N-doped TiO₂ films were able to function effectively as photogenerated cathodic protection for metals under UV and visible light illumination. Such photogenerated cathodic protection could last a period of 5.5 h even in darkness.     

溶胶凝胶-离子交换法制备具有可见光活性介孔AgInO2光催化剂

具有可见光响应高效光催化剂的设计和制备是环境与能源光催化研究领域的前沿和热点之一。本文采用溶胶凝胶-离子交换法制备AgInO₂介孔纳米材料,利用热分析(TGA-DSC)、X-射线衍射(XRD)、场发射扫描电镜(FESEM)、N₂吸附脱附以及紫外-可见吸收光谱等测试手段,研究了制备条件对AgInO₂微观结构的影响因素,并以甲醛为目标降解物研究了AgInO₂在可见光条件下光催化性能。研究结果表明：制备的介孔AgInO₂具有铜铁矿结构的晶型,颗粒尺寸约200-500纳米,N₂吸附脱附非等温曲线呈IV型,吸收边位于500-600 nm可见光范围内,在可见光照射180 min 的条件下,介孔AgInO₂对甲醛的光催化降解率达93.97%。本研究为介孔AgInO₂光催化剂在净化室内空气的广泛应用奠定了实验基础。     

空心结构ZnSn(OH)6立方体制备及其可见光催化性能研究

以乙酸锌、锡酸钠、氟化铵为原料,利用NH₄F刻蚀,采用水热法制备了尺寸250 nm的空心结构ZnSn(OH)₆立方体,通过X射线衍射(XRD)、红外光谱(FTIR)、拉曼光谱(Raman)、扫描电镜(SEM)、透射电镜(TEM)、荧光光谱(PL)等来表征ZnSn(OH)₆的晶体结构、形貌和光学性能,研究水热时间对ZnSn(OH)₆形貌的影响,通过降解亚甲基蓝(MB)来探索不同形貌的ZnSn(OH)₆的光催化性能。结果表明,水热2 h制备的ZnSn(OH)₆具有完整的空心结构,且对亚甲基蓝(MB)在可见光下降解效率最优,在降解过程中·O^2-起主要作用,其稳定性良好。说明空心ZnSn(OH)₆立方体光催化材料是一种具有广阔应用前景的可见光催化降解材料。     

Photocatalytic activities of N doped TiO2 coatings on 316L stainless steel by plasma surface alloying technique

Nitrogen doped titanium dioxide (N-TiO₂) coatings were fabricated by oxidation of the TiN_x coatings in air. TiN_x coatings were prepared on stainless steel (SS) substrates by plasma surface alloying technique. The reference TiO₂ sample was also deposited by oxidation of the Ti coatings in air. The as-prepared coatings were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and ultra violet-visible absorption spectroscopy (UV-Vis). The formation of anatase type TiO₂ is confirmed by XRD. SEM measurement indicates a rough surface morphology with sharp, protruding modules after annealing treatment. The band gap of the N-doped sample is reduced from 3.25 eV to 3.08 eV compared with the undoped one. All the N-doped samples show red shift in photoresponse towards visible region and improved photocurrent density under visible irradiance is observed for the N-doped samples. The photocatalytic activity was evaluated via the photocatalytic oxidation of methylene blue (MB) in aqueous under visible light irradiation. The results reveal that the N-doped samples extend the light absorption spectrum toward the visible region. The degradation rate of N-TiO₂ is 20% in visible irradiation for 150 min.     

Purifying behavior of photocatalytic TiO2 anodized in nitrate ion containing solution

Mesoporous titanium dioxide films were fabricated on titanium plates by micro-arc oxidation method. To increase the photocatalytic activity of the films, NH₄NO₃ was added to the H₂SO₄ solution, and anodizing was carried out at high voltages using a DC power supply. The crystal structure, chemical composition, surface morphology and the optical property of the films were investigated by XPS, XRD, UV-VIS spectroscopy and SEM. The photocatalytic activity of the films was evaluated by the decomposition of aniline blue, and the activity of the films for the degradation turned out to be improved by the additives to the electrolyte solution. The enhanced photocatalytic activity might result from the increased porosity and nitrate ion incorporation into the anodic films by micro arcing, and thereby the TiO₂ layer might exhibit an improved absorption property for the visible light.     

Facile Synthesis of Ag@AgCl Plasmonic Photocatalyst and Its Photocatalytic Degradation under Visible Light

采用简单的沉淀-光还原法合成了具有可见光催化降解有机物高活性的Ag@AgCl等离子共振光催化剂。采用扫描电镜、X射线能谱、透射电镜、XRD、紫外-可见漫反射光谱和XPS等手段对催化剂进行了表征。通过可见光下降解甲基橙进行光催化活性测试。结果显示,Ag@AgCl由于Ag纳米粒子的等离子共振效应而具有较强的吸收可见光性能。对光催化反应参数如投加量、光还原时间及pH值等进行了优化,在最优条件下,经过120 min可将83%的甲基橙降解。优异的光催化活性归因于银纳米颗粒的等离子共振效应。最后对光致电荷的分离机理进行了讨论。     

N-doped TiO2/ZnO composite powder and its photocatalytic performance for degradation of methyl orange

The N-doped TiO₂/ZnO composite powder with a molar ratio of Ti to Zn of 3/1 was prepared via sol–gel process and then ammonia treated with NH₃ mass fractions of 0%, 7%, and 28% for 24 h at room temperature followed by thermal calcinations in air for 2 h at various temperatures of 500, 600, and 700 °C. The as-prepared composite powder was characterized in detail through thermo-gravimetric analyzer, X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and high-resolution transmission electron microscopy. The results showed that the phase transformation of anatase to rutile has been successfully retarded via the ammonia treating process, leading to the presence of anatase phase in the composite. The particle crystallization of the composite powder was significantly promoted with the increase of the calcining temperature. The photocatalysis evaluation through MO degradation revealed an enhanced photocatalytic activity for the composite powder that might be related to the good crystallization, the presence of anatase phase, and the particle size reduction of the powder.