三维网状Dy3+:YVO4/TiO2复合纤维的制备及光催化产氢性能

以电纺TiO₂纳米纤维为基质, 柠檬酸为软模板, 采用一步水热法制备了具有三维立体网状结构的稀土Dy ³⁺掺杂YVO₄/TiO₂复合纤维. 通过X射线衍射、 扫描电子显微镜、 X射线光电子能谱、 N₂吸附-脱附、 紫外-可见漫反射光谱及荧光光谱等手段对材料的组成、 表面形貌和性能进行表征, 以光分解水产氢实验考察其光催化活性. 结果表明, Dy ³⁺∶YVO₄纳米枝与TiO₂纳米纤维相互交联构筑的纳米纤维网具有大比表面积, 可提供更多活性位点, 改善了多相光催化反应的传递过程; 稀土Dy ³⁺掺杂的YVO₄与TiO₂复合形成异质结相互促进, 在拓宽光谱响应范围、 提高太阳光利用率的同时使光生电子-空穴对得到较好分离, 从而提高了样品的光催化活性. 模拟太阳光照射下, Dy ³⁺∶YVO₄/TiO₂复合纤维光催化产氢速率达到8.63 mmol· h ^-1·g ^-1, 是纯TiO₂纳米纤维的10倍.     

Surface Functionalization of PEO Nanofibers Using a TiO2 Suspension as Sheath Fluid in a Modified Coaxial Electrospinning Process

Convenient and integration fabrication process is a key issue for the application of functional nanofibers. A surface functionalization method was developed based on coaxial electrospinning to produce ultraviolet(UV) protection nanofibers. The titanium dioxide(TiO₂) nanoparticles suspension was delivered through the shell channel of the coaxial spinneret, by which the aggregation of TiO₂ nanoparticles was overcome and the distribution uniformity on the surface of polyethylene oxide(PEO) nanofiber was obtained. With the content of TiO₂ increasing from 0 to 3%(mass fraction), the average diameter of nanofibers increased from (380±30) nm to (480±100) nm. The surface functionalization can be realized during the electrospinning process to gain PEO/TiO₂ composite nanofibers directly. The uniform distribution of TiO₂ nanoparticles on the surface of nanofibers enhanced the UV absorption and resistance performance. The maximum UV protection factor(UPF) value of composite nanofibers reaches 2751. This work presented a novel surface-functionalized way for the preparation of composite nanofiber, which has great application potential in the field of micro/nano system integration fabrication.     

AOPAN@Mg(OH)2多层次电纺纤维膜的制备及除铬性能

以含有—NH₂和C═N的偕胺肟化聚丙烯腈(AOPAN)纳米纤维膜为载体, 通过水热法在AOPAN纳米纤维膜表面原位生长片状Mg(OH)₂纳米粒子, 得到具有多层次结构的有机-无机电纺复合纳米纤维膜[AOPAN@Mg(OH)₂], 并研究了AOPAN@Mg(OH)₂的除铬性能. 研究结果表明, 当水热温度为40 ℃, 水热时间为7 h时, AOPAN纳米纤维膜表面形成了明显的多层次结构的Mg(OH)₂纳米晶体. 当溶液pH=2时, AOPAN@Mg(OH)₂复合纳米纤维膜对Cr(Ⅵ)的吸附符合Langmuir模型, 且满足二级动力学方程, 5 h后最大吸附量达到123.5 mg/g. AOPAN@Mg(OH)₂复合纳米纤维膜中含有—NH₂基团和Mg(OH)₂纳米粒子, 在酸性条件下可以质子化为带正电的—N\begin{array}{c}{H}_3^{+}\end{array}和Mg(OH)₂H⁺, 通过静电吸附更易与HCr\begin{array}{c}{O}_4^{-}\end{array}结合. 此类复合纳米纤维膜材料在水体中易取出, 并且在稀NaOH溶液中可以解吸附, 循环使用4次去除率仍可以保持在50%以上.     

Preparation and Photocatalysis of Mesoporous TiO2 Nanofibers via an Electrospinning Technique

Mesoporous TiO₂ nanofibers have been synthesized by a new method that combines sol-gel chemistry and electrospinning technique. The obtained mesoporous TiO₂ nanofibers were characterized with scanning electron microscopy(SEM), X-ray diffraction(XRD), transmission electron microscopy(TEM) and nitrogen adsorption-desorption isotherms. The photocatalytic performance was evaluated by the photocatalytic degradation of Rhodamine B under UV light irradiation. The results show that mesoporous TiO₂ nanofibers exhibit higher photocatalytic activity compared with nonporous TiO₂ nanofibers.     

三元Ho3+-TiO2/Bi等离子体复合纤维制备及其可见光催化产氢性能

以电纺Ho³⁺-TiO₂纳米纤维为基质,葡萄糖酸钠为还原剂,采用水热法制备Ho³⁺-TiO₂/Bi等离子体复合纤维光催化剂。 利用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)、紫外可见漫反射光谱(UV-Vis DRS)和瞬时光电流(IP)等分析测试手段对样品的物相、形貌和光电性能等进行表征。 以三乙醇胺为电子给体,研究了Ho³⁺-TiO₂/Bi光催化分解水产氢的反应过程。 结果表明:在水热过程中,Bi³⁺被葡萄糖酸钠还原成单质Bi纳米颗粒,复合在Ho³⁺-TiO₂纳米纤维表面形成肖特基结。 金属Bi通过局域表面等离子体共振效应结合稀土元素丰富的能级结构和4f电子跃迁特性,对TiO₂进行双重修饰改性,有效提高了TiO₂的光催化活性和稳定性,可见光下产氢速率最大为43.6 μmol/(g·h)。     

共沉淀法制备Ag/AgCl-TiO2空心复合纳米微球及其光催化性能

通过甲基丙烯酸与苯乙烯聚合制备了表面负电性的聚苯乙烯(PSt)纳米乳胶粒. 在乙醇与水的混合溶剂中, 用硅烷偶联剂乙烯基三甲氧基硅烷对其进行表面改性后加入钛酸四丁酯、 氯化钠和硝酸银, 以PSt乳胶粒为模板采用共沉淀法制备了PSt-AgCl-TiO₂复合微球. 在180 ℃对其进行液相预处理及煅烧去除PSt模板后制备了Ag/AgCl-TiO₂空心复合粒子. 对各阶段产物的形貌、 晶体结构和比表面积等进行了表征. 结果表明, 所得产物为Ag/AgCl与锐钛矿型TiO₂复合的空心粒子, 其比表面远大于商品TiO₂(P25). 考察了Ag/AgCl-TiO₂复合粒子在紫外光与可见光下对罗丹明B(RhB)降解的催化活性. 结果表明, 在紫外光下n(Ag)/n(Ti)=0.1%的Ag/AgCl-TiO₂复合粒子活性最高, 30 min时对RhB的降解率比不含Ag/AgCl的TiO₂空心微球提高了13%; 虽然Ag/AgCl-TiO₂在可见光下的催化活性远比紫外光下低, 但与纯TiO₂空心纳米微球相比其催化活性仍明显增强. n(Ag)/n(Ti)=2.0%的Ag/AgCl-TiO₂复合粒子催化活性最高, 120 min时对RhB的降解率比不含Ag/AgCl的TiO₂空心微球提高了38%.     

H4SiW12O40/乙烯-乙烯醇共聚物复合纳米纤维膜的制备及光催化性能

利用静电纺丝技术制备了H₄SiW₁₂O₄₀(SiW₁₂)/乙烯-乙烯醇共聚物(EVOH)复合纳米纤维膜. X射线能谱(EDX)和红外光谱(IR)表征结果表明, SiW₁₂负载到EVOH纤维膜中, 且其Keggin结构完好无损. SiW₁₂/EVOH复合纳米纤维膜在氙灯光源照射下对甲基橙(MO)表现出优异的光催化活性. 当EVOH与SiW₁₂的质量比为2:1时, MO降解率可达96.3%. 复合纳米纤维膜优异的光催化活性主要归于EVOH与SiW₁₂的协同相互作用. 复合纤维膜具有良好的可重复使用性, 循环使用3次后, 其光催化活性没有明显下降. 因此, SiW₁₂/EVOH复合纳米纤维膜在去除废水中有机染料方面具有广阔的应用前景.     

The photocatalytic activity of TiO2 foam and surface modified binary oxide titania nanoparticles

Surface modified titania dioxide composite nanoparticles prepared by hydrogen reduction reaction and a mesoporous TiO₂ foam made from a surface modifier and a long chain organic surfactant were characterized by diffractive, spectroscopic and microscopic techniques and studied for their catalytic activity towards the decomposition of an industrial water pollutant, methyl orange. The surface deposition of ruthenium and silicon particles improved the photocatalytic activity of the composite particles resulting in a faster decomposition of the methyl orange compared to commercial TiO₂ alone. Modification of TiO₂ with RuO₂ only offered a marginal benefit over TiO₂ while the incorporation of RuO₂ and SiO₂ into TiO₂ resulted in a marked increase in the rate constant and catalytic activity. These results are consistent with the enhanced surface properties of the composite materials resulting from the modification of TiO₂ with RuO₂ and SiO_2. This surface enhancement effects appear synergetic to the charge separation process and hence the photocatalytic results are explained on the basis of a mechanism involving efficient charge transfer across the interfaces of the composites involving photogenerated electron–hole pairs. Results obtained in this study show that the percentage degradation after 1 h of illumination was 47.15% for TiO₂ foam, 75.5 and 106.4%, respectively, for TiO₂/RuO₂ (SiO₂ 5%, w/w) and TiO₂/RuO₂(SiO₂ 10%, w/w) and 34.15% for commercial TiO₂.     

Isoelectric point-controlled preferential photodeposition of platinum on Cu2O-TiO2 composite surfaces

Isoelectric point-controlled preferential adsorption of[PtCl₆]^2- on Cu₂O/TiO₂ composite surfaces is revealed to play a key role in the photodeposition process.     

Characterization and photocatalytic properties of silver and silver chloride doped TiO2 hollow nanoparticles

Using polystyrene（PSt） particles as template,PSt/TiO₂ composite particles with AgCl incorporation were prepared through hydrolysis of tetrabutyl titanate in the presence of AgNO₃ and NaCl.AgCl doped TiO₂ hollow particles were successfully prepared with the PSt/TiO₂ composite microspheres pretreated at 180℃followed by calcination.The morphology of PSt/TiO₂ particles and the crystal structures of the AgCl doped TiO₂ hollow particles were characterized.The photocatalytic activity of the doped TiO₂ hollow particles in degradation of Rhodamine B was tested under UV and visible lights and compared to that with Ag doped TiO₂ particles.The results showed that TiO₂ hollow particles,either doped with Ag or AgCl,demonstrated higher photocatalytic activity than the pure TiO₂ particles.This enhancement in photocatalytic activity was more significant with AgCl doped TiO₂ than that with Ag doped,and more distinct when the degradation was done under visible light than that under LTV light.     

TiO2-V2O5纳米复合膜的制备及防腐蚀性能

采用溶胶-凝胶法和浸渍提拉技术在316L不锈钢表面构筑纳米TiO₂薄膜和“夹心”式TiO₂-V₂O₅复合薄膜（TiO₂/TiO₂-V₂O₅/TiO₂）, 应用AFM和XRD表征膜的形貌及纳米颗粒的晶型. 结合光、电化学方法测试了复合膜在0.5 mol•L^-1 NaCl溶液(pH=4.6)中暗态或紫外照射条件下的防腐蚀性能. 结果表明, TiO₂/TiO₂-V₂O₅/TiO₂复合膜具有双重保护功能, 即在紫外光照下可以起到光生阴极保护的作用, 特别是当停止光照后, 光生电位仍可维持在较低的电位长达6 h以上. 同时作为表面阻挡层, 可显著提高金属的耐腐蚀性.     

A Novel Hollow Carbon@MnO2 Electrospun Nanofiber Adsorbent for Efficient Removal of Pb2+ in Wastewater

Lead ion(Pb²⁺) is one of the most hazardous heavy metal ions in aquatic environments. Carbon materials and manganese dio-xide(MnO₂) have been shown to be prospective adsorbents to cope with the lead pollution. In this study, a novel hollow carbon@MnO₂ composite nanofiber adsorbent was prepared by the combination of electrospinning and carbonization. The PAN nanofiber membrane is subjected to a pre-oxidation and carbonization process, and then the obtained carbon nanofibers react with KMnO₄ solution during the hydrothermal process to develop the hollow carbon@MnO₂ nanofibers. The hollow carbon@MnO₂ nanofibers displayed a higher adsorption capacity of Pb²⁺ than carbon and MnO₂/PDA/PAN nanofibers. The maximum adsorption capacity toward Pb²⁺ by hollow carbon@MnO₂ nanofibers was 460.83 mg/g. After 5 adsorption-desorption cycles, the carbon@MnO₂nanofibers had a good recyclability and the removal efficiency remained 81.47%. Moreover, the removal efficiency of the hollow composite nanofibers for Pb²⁺ from real wastewater could reach 94.37%. This work shows a strategy for synthetics of the hollow carbon@MnO₂ nanofibers, which exhibits a promising potential in actual wastewater treatment.     

Stabilization mechanism of TiO2 on flexible fluorocarbon films as a functional photocatalyst

The repetitive discoloration kinetics of the azo-dye Methyl Orange (taken as a model organic compound) was followed under solar simulated radiation (90 mW/cm²) to assess the performance of the TiO₂/Tedlar^® composite photocatalyst. The influence of solution parameters on the photo-discoloration process: pH, dye concentration, applied light intensity and concentration of H₂O₂ were systematically investigated. During the photocatalysis a modification occurs in the TiO₂/Tedlar^® composite due to the TiO₂ interaction with the Tedlar^® film. Physical insight is given for the stabilization mechanism of the TiO₂ particles in the Tedlar matrix based on the data obtained by X-ray photoelectron spectroscopy (XPS). The F 1s peak of the Tedlar film indicates that the TiO₂ is loaded on the Tedlar fluoro-groups. The loading of TiO₂ on the 75 μm thick Tedlar^® film was 0.9% (w/w) as determined by atomic absorption spectrophotometry (AAS). Attenuated total reflection infrared spectroscopy (ATRIR) shows no formation of additional bands within the photodiscoloration reaction. This shows that an efficient catalysis taking place on the TiO₂/Tedlar^® surface. The rugosity (mean square roughness, rms) of the TiO₂/Tedlar^® film was determined by atomic force microscopy (AFM) to be 19.7 nm. This value remained constant during long-term operation. Transmission electron microscopy (TEM) reports the thickness and coverage of TiO₂ Degussa P-25 on the Tedlar^® surface before and after photocatalysis.     

微波辅助快速制备2D/1D ZnIn2S4/TiO2 S型异质结及其光催化制氢性能

The threat and global concern of energy crises have significantly increased over the last two decades. Because solar light and water are abundant on earth, photocatalytic hydrogen evolution through water splitting has been considered as a promising route to produce green energy. Therefore, semiconductor photocatalysts play a key role in transforming sunlight and water to hydrogen energy. To date, various photocatalysts have been studied. Among them, TiO₂ has been extensively investigated because of its non-toxicity, high chemical stability, controllable morphology, and high photocatalytic activity. In particular, 1D TiO₂ nanofibers (NFs) have attracted increasing attention as effective photocatalysts because of their unique 1D electron transfer pathway, high adsorption capacity, and high photoinduced electron–hole pair transfer capability. However, TiO₂ NFs are considered as an inefficient photocatalyst for the hydrogen evolution reaction (HER) because of their disadvantages such as a large band gap (~3.2 eV) and fast recombination of photoinduced electron–hole pairs. Therefore, the development of a high-performance TiO₂ NF photocatalyst is required for efficient solar light conversion. In recent years, several strategies have been explored to improve the photocatalytic activity of TiO₂ NFs, including coupling with narrow-bandgap semiconductors (such as ZnIn₂S₄). Recently, microwave (MW)-assisted synthesis has been considered as an important strategy for the preparation of photocatalyst semiconductors because of its low cost, environment-friendliness, simplicity, and high reaction rate. Herein, to overcome the above-mentioned limiting properties of TiO₂ NFs, we report a 2D/1D ZnIn₂S₄/TiO₂ S-scheme heterojunction synthesized through a microwave (MW)-assisted process. Herein, the 2D/1D ZnIn₂S₄/TiO₂ S-scheme heterojunction was constructed rapidly by using in situ 2D ZnIn₂S₄nanosheets decorated on 1D TiO₂ NFs. The loading of ZnIn₂S₄ nanoplates on the TiO₂ NFs could be easily controlled by adjusting the molar ratios of ZnIn₂S₄ precursors to TiO₂ NFs. The photocatalytic activity of the as-prepared samples for water splitting under simulated solar light irradiation was assessed. The experimental results showed that the photocatalytic performance of the ZnIn₂S₄/TiO₂ composites was significantly improved, and the obtained ZnIn₂S₄/TiO₂ composites showed increased optical absorption. Under optimal conditions, the highest HER rate of the ZT-0.5 (molar ratio of ZnIn₂S₄/TiO₂= 0.5) sample was 8774 μmol·g^-1·h^-1, which is considerably higher than those of pure TiO₂ NFs (3312 μmol·g^-1·h^-1) and ZnIn₂S₄nanoplates (3114 μmol·g^-1·h^-1) by factors of 2.7 and 2.8, respectively. Based on the experimental data and Mott-Schottky analysis, a possible mechanism for the formation of the S-scheme heterojunction between ZnIn₂S₄ and TiO₂ was proposed to interpret the enhanced HER activity of the ZnIn₂S₄/TiO₂heterojunctionphotocatalysts.      

RE-B共掺杂片层TiO2的合成及其光催化性能

采用溶胶-凝胶法,利用钛酸四丁酯、硝酸镧、硝酸铈和硼酸为原料,对TiO₂光催化剂进行稀土-B(RE-B)的共掺杂改性制备和性能研究。采用X-射线衍射法(XRD)、冷场发射扫描电子显微镜(SEM)、X射线光电子能谱(XPS)、紫外-可见吸收(UV-Vis)光谱和荧光(PL)光谱对制得样品的相组成、表面形貌结构、表面元素组成、光响应范围及带隙能和电子-空穴的复合情况进行了初步分析。结果表明,所制掺杂TiO₂的组成均为锐钛矿型,掺杂使晶格发生了较大畸变,且细晶粒由未掺杂的27 nm减小到RE-B-TiO₂的10 nm,形貌为片层状不规则堆放状态存在。XPS结果表明掺杂元素有效进入二氧化钛, PL谱显示共掺杂可有效延长光催化剂的载流子寿命。掺杂后吸收边均红移, La-B-TiO₂由TiO₂的405 nm移动到466 nm,相应地禁带宽度减小了0.4 eV。光催化实验表明:2 h内降解亚甲基蓝(MB)时掺杂能够同时提高紫外和可见光下二氧化钛的光催化效率,而共掺杂的降解效果又优于单掺杂, La-B-TiO₂紫外光下的降解率达到80.67%,为同等条件下纯TiO₂的2.7倍,可见光下的降解率为74.78%。     

Au/TiO_2/MoS_2等离子体复合光催化剂的制备及其增强光催化产氢活性

采用尿素沉积法制备了Au/Ti O_2/Mo S_2等离子体复合光催化剂。通过光催化产氢实验,在10%(φ,体积分数)甘油水溶液为牺牲剂条件下,研究了不同Mo S_2含量、Au固载2%(w,质量分数)时,Au/Ti O_2/Mo S_2(ATM)复合样品的光催化产氢活性。结果表明,当Mo S_2含量为0.1%(w)时,复合样品ATM0.1显示出最高的光催化产氢活性,其产氢速率达到708.85μmol·h~(-1),是Ti O_2/Mo S_2(TM)两相复合样品中光催化活性最高样品TM6.0产氢速率的11倍。三相复合样品显示增强光催化产氢活性主要是由于吸附在Ti O_2/Mo S_2层状复合材料上的Au纳米颗粒具有表面等离子共振效应,能强烈吸收波长范围550–560 nm的可见光,诱导产生光生电子,金纳米颗粒上的电子受到激发后转移到Ti O_2导带上,Ti O_2导带上的电子传递给片状Mo S_2,最终在Mo S_2上催化氢气产生。     

NiO/TiO2异质结构纳米管阵列膜对不锈钢的光生阴极保护及其储能性能

本工作通过修饰TiO₂制备半导体复合膜,提高其光吸收和光电化学性能,以期应用于光生阴极保护。先采用阳极氧化法在Ti表面制备TiO₂纳米管阵列膜,再应用水热处理法在膜表面沉积NiO纳米颗粒,形成具有异质结构纳米管复合膜。利用扫描电子显微镜、X-射线衍射、X-射线光电子能谱、紫外-可见吸收光谱、光致发光谱和光电化学技术对制备的纳米膜进行表征。结果表明,与纯TiO₂纳米管膜比较,NiO/TiO₂纳米管复合膜的光吸收扩展到可见光区。白光照射下,其在0.5 mol·L^?1 KOH和1 mol·L^?1 CH3OH混合液中的光电流密度达到176μA·cm^?2,是纯TiO₂纳米管膜的2倍。复合膜具有良好的光生阴极保护作用,与0.5 mol·L^?1 NaCl溶液中的403不锈钢耦连后,可使其电极电位下降440 mV,在光照2.5 h再转为暗态后,因具有电荷储存能力还可继续提供约15.5 h的阴极保护效应。     

制备二氧化钛分枝纳米棒阵列结构以提高聚合物杂化太阳电池的性能

分别采用一步水热法和两步水热法在导电玻璃(FTO)上制备了二氧化钛(TiO₂)纳米棒(NR)阵列和TiO₂分枝纳米棒(B-NR)阵列。 利用低温化学浴沉积法(CBD)在TiO₂纳米棒阵列(NRA)和TiO₂分枝纳米棒阵列(B-NRA)基底上沉积Sb₂S₃纳米粒子(NPs)。 接着分别旋涂聚-3已基噻吩(P3HT)和2,2'7,7'-四-(二甲氧基二苯胺)螺芴(Spiro-OMeTAD)组装成TiO₂(NRA)/Sb₂S₃/P3HT/Spiro-OMeTAD和TiO₂(B-NRA)/Sb₂S₃/P3HT/ Spiro-OMeTAD为光活性层的杂化太阳电池。 结果表明,由TiO₂(NRA)/Sb₂S₃/P3HT/Spiro-OMeTAD复合膜结构组装的杂化太阳电池的光电转换效率(PCE)是2.92%,而由TiO₂(B-NRA)/Sb₂S₃/P3HT/Spiro-OMeTAD复合膜结构组装的杂化太阳电池的PCE提高到了4.67%。     

氟钒锰共掺对TiO2柱撑膨润土光催化脱硝性能的影响

采用溶胶-凝胶法制备氟钒锰共掺改性的TiO₂柱撑膨润土，使用XRD、氮吸附、UV-vis光谱和SEM等手段对其进行了表征测试，并对其室温下的可见光催化脱硝性能进行了评价研究。结果表明，对于NO质量浓度为661 μg/m³的气体，F-V-Mn共掺TiO₂柱撑膨润土的光催化脱除效率近似达到100%，而NO质量浓度提升至1657 μg/m³时，光催化效率为81.9%，与未柱撑的F-V-Mn共掺TiO₂相比提高了33.8%。F-V-Mn共掺TiO₂柱撑膨润土上光催化脱反应速率常数最大，是V-Mn共掺TiO₂柱撑膨润土的2倍，且前者的抗水和抗SO₂中毒能力也更强。TiO₂柱撑不仅保留了膨润土的片状晶体结构，而且使膨润土层间距由0.667 nm增大至0.710 nm，吸附能力增强；同时，掺杂元素能抑制TiO₂金红石相生长，降低TiO₂禁带宽度，提高可见光响应，延长使用寿命，拓宽应用范围。     

微波辅助溶剂热合成In-Si共改性TiO_2的增强光催化性能

利用微波辅助溶剂热法合成了In-Si共改性的TiO2光催化剂.粉末X射线衍射(XRD)、激光拉曼(Raman)光谱、N2吸脱附(BET)、X射线光电子能谱(XPS)、光致发光(PL)光谱和紫外-可见漫反射光谱(UV-Vis DRS)等实验表明,尽管掺杂和改性后TiO2结晶度略有降低,但不影响光催化剂锐钛相的形成.Si掺杂入TiO2晶格使颗粒变小,比表面积变大.In不能进入TiO2晶格,在TiO2表面形成了In2O3.罗丹明B(RhB)降解实验显示,In-Si共改性TiO2表现出很高的紫外和可见光催化活性,Si:In:Ti的摩尔比为0.03:0.02:1的样品(IST-2)光催化活性最高,紫外光下3 min即可将RhB降解完全,可见光下120 min RhB降解率为97%,这是由材料的高表面积,In2O3-TiO2复合半导体之间高效电荷转移及染料敏化等共同作用所致.对于苯酚,光催化降解则相对缓慢,700 min内尚不能降解完全.