光触媒及其在纤维中的应用

介绍了二氧化钛光触媒的特点和作用机理,简述了光触媒粉末及复合材料的开发情况以及光触媒 在纤维领域的应用情况,指出我国光触媒技术研究还在起步阶段,应加快光触媒的研究,开发具有光触媒功 能的纤维产品。     

二氧化钛光触媒在金属镀膜与金属防护技术中的应用第四部分——光触媒的性能评价标准与高性能化

随着二氧化钛光触媒从研究领域走向实用,光触媒材料的评价标准问题逐渐受到重视。介绍了日本制定光触媒标准的现状以及实现光触媒的高性能化方法。以含或不含光触媒的乙醛试样在紫外光的照射下的分解速度对比试验说明了光触媒的空气净化性能的评价方法。     

二氧化钛光触媒在金属镀膜与金属防护技术中的应用第三部分光触媒的金属涂饰与腐蚀防护

分别介绍了金属表面二氧化钛光触媒涂层的自清洁原理和光半导体光触媒的防腐蚀原理。比较了含与不含光触媒涂层的不锈钢基体在不同pH的氯化钠溶液中的腐蚀电位。指出使水接触角趋于零而产生超亲水性是光触媒涂层具有自清洁功能的原因;吸收紫外光释放电子给金属,从而降低金属的腐蚀电位,是其具有防腐性能的实质;在基体与光触媒涂层间设置中间层可以避免基体被光触媒氧化;采用WO3与TiO2复合可以使光触媒涂层在无光或夜间继续发挥其防腐蚀功能。     

国内外TiO2光触媒涂料的研究进展

光触媒涂料是一种环境友好涂料,因其具有将有机物降解为二氧化碳和水的特性近年来备受关注。综述了国内外TiO2光触媒涂料如光触媒抗菌防霉类涂料、光触媒耐污类涂料等等的作用机理及其研究现状,并对今后TiO2光触媒涂料的发展进行了展望。     

可见光活性纳米TiO2光触媒研究进展

简要概述了具有可见光活性的纳米TiO2光触媒的光催化机理,该机理与紫外光光催化机理的不同之处在于其电荷传输与分离机制。结合近年来TiO2光触媒的研究成果,分别从离子掺杂、离子注入、复合半导体、表面贵金属沉积和染料光敏化五个方面对纳米TiO2光触媒的可见光化研究作了较为详细的总结,以期推动纳米TiO2光触媒在我国的发展。     

负载光触媒复合材料的研究进展

在目前水体污染治理应用中,半导体光催化氧化技术已经受到了人们的极大关注。制备光触媒负载物,更能有效应用于水体污染治理。本文介绍了光催化降解的机理,同时分析了目前光催化剂治理水体污染所面临的主要问题,提出了制备负载光触媒复合材料的解决方法,并对光触媒负载物现有研究情况进行总结,并对光触媒负载织物的应用前景进行展望。     

二氧化钛光触媒在金属镀膜与金属防护技术中的应用第二部分溶胶-凝胶法制备二氧化钛工艺

介绍了由Ti(OR)4合成二氧化钛光触媒的反应机理和合成工艺。X射线衍射分析表明,由该工艺得到的无定形的二氧化钛粉末即使在加热到650℃,所得的光触媒仍属于锐钛型。对四氯化钛合成二氧化钛光触媒的高温工艺研究表明,乙醇的浓度对光触媒的晶型有较大的影响,从含与不含乙醇的溶剂中得到的无定型TiO2在加热到430℃时,得到的光触媒的晶型不同,前者为金红石型,后者为锐钛型;而低温工艺得到的是锐钛型的TiO2光触媒。分析了低温合成工艺的优缺点。     

光触媒治理室内空气污染的实验研究

本文研究了两种光触媒在不同条件下对室内空气中有害物质甲醛、苯系物、TVOC降解效率。指出光触媒在无可见光下,净化效率低的不足之处,并对此提出建设性意见。     

纳米光触媒技术,国际新兴的环保高新技术

光触媒技术是指利用不同光源照射某些物质使之具有催化反应功能的技术,能在光作用下具有催化功能的物质叫光触媒;光源主要可以是紫外光或含有紫外光的灯光、自然光和日光。目前应用最广泛的光触媒主要是TiO2。因此,目前人们所说的光触媒是以纳米TiO2为代表的具有光催化功能的光半导体材料的总称。纳米光触媒催化技术是利用纳米技术将触媒物质做成纳米级范围内颗粒（5～10nm）,使之能适应更多的光源,发挥出更好的光催化效果,故把经纳米技术处理的光触媒称之为纳米光触媒。     

光触媒在空气净化中的应用

叙述了以纳米级二氧化钛为代表的光触媒在治理环境中痕量污染物的应用效果及光触媒与空气净化器的组合设计,以提高其功效。     

Fe2O3/TiO2光催化剂固载化及处理有机废水可行性研究

研究了采用溶胶-凝胶法制备Fe2O3和TiO2两种光催化剂，将其负载于不同的固体颗劳上以提高光催化剂的光量子效率及回收率。并探索了采用固载型复合光催化剂处理亚甲基兰、结晶紫等染料废水和甲醛、乙醇、TNT、十四烷等多种有机物废水的难易程度及可行性。显示了固载复合型光催化剂比单一光催化剂具有更高的处理效率与更广泛的应用前景。     

BiOCl光催化剂的改性和固定化研究进展

氯氧化铋(BiOCl)是一种具有良好光催化活性的的新型半导体光催化剂,其独特的层状结构和电子性质决定了它在化工、环保、能源等领域有着巨大的应用前景。本文针对BiOCl光催化剂在应用中存在的问题,对BiOCl光催化剂的掺杂改性和固定化研究进展进行了综述,并对BiOCl光催化剂的研究方向及存在问题进行了展望。     

絮凝法制备TiO2/MCM-41复合光催化剂及其性能的研究

以MCM-41分子筛为介孔材料,采用絮凝法制备复合光催化剂,通过XRD对复合光催化剂的晶型结构和形貌进行了表征,以人工合成染料罗丹明B为降解对象,考察絮凝pH、煅烧时间、煅烧温度、光照时间、催化剂投加量对复合光催化剂活性的影响。实验结果表明：在絮凝pH值为4时所得絮凝污泥,经700℃煅烧2h后的复合光催化剂具有最佳的光催化活性,在紫外光下照射浓度为20mg/L的罗丹明B 40min可获得98%以上的降解效果。     

TiO2光催化剂改性研究进展

TiO2以其催化活性高,热稳定性好,抗光氧化性强及无二次污染等特性成为最受重视的一种光催化剂。本文介绍了TiO2光催化机理、指出了TiO2的缺点,重点对TiO2光催化剂的改性、提高其降解废水效率的研究进行了综述,提出了今后TiO2光催化剂改性的研究方向。     

钒掺杂二氧化钛光催化活性研究

二氧化钛凭借优异的光催化性能,越来越受到人们的广泛关注和重视。以钛酸四丁酯为原料,利用水解-水热-干燥/煅烧工艺制备得到未掺杂TiO₂光催化剂和掺钒TiO₂光催化剂,利用其对甲基橙溶液的降解率做了比较分析。结果表明,以钛酸四丁酯为原料,采用溶胶-凝胶法制备钒掺杂TiO₂光催化剂是可行的。制备V/TiO₂产品的最佳工艺条件：钒钛质量比为6∶100、水热温度为160 ℃、水热时间为12 h,120 ℃下干燥14 h。紫外光照射条件下,甲基橙光催化降解效率达到99.10%,降解时间小于45 min。     

Efficient solar photocatalyst based on cobalt oxide/iron oxide composite nanofibers for the detoxification of organic pollutants

A Co₃O₄/Fe₂O₃ composite nanofiber-based solar photocatalyst has been prepared, and its catalytic performance was evaluated by degrading acridine orange (AO) and brilliant cresyl blue (BCB) beneath solar light. The morphological and physiochemical structure of the synthesized solar photocatalyst was characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FTIR). FESEM indicates that the Co₃O₄/Fe₂O₃ composite has fiber-like nanostructures with an average diameter of approximately 20 nm. These nanofibers are made of aggregated nanoparticles having approximately 8.0 nm of average diameter. The optical properties were examined by UV-visible spectrophotometry, and the band gap of the solar photocatalyst was found to be 2.12 eV. The as-grown solar photocatalyst exhibited high catalytic degradation in a short time by applying to degrade AO and BCB. The pH had an effect on the catalytic performance of the as-grown solar photocatalyst, and it was found that the synthesized solar photocatalyst is more efficient at high pH. The kinetics study of both AO and BCB degradation indicates that the as-grown nanocatalyst would be a talented and efficient solar photocatalyst for the removal of hazardous and toxic organic materials.     

Indoor air purification using heterogeneous photocatalytic oxidation. Part I: Experimental study

Heterogeneous photocatalytic oxidation (PCO) has shown to be a promising air purifying technology in outdoor conditions using TiO₂ as photocatalyst activated with UV light. Also to indoor air quality more and more attention is paid because of the very important role it plays on human health, and it can be influenced by many factors like ventilation system, building materials, furniture, cooking, and outdoor pollutants.The present work addresses the indoor air purification using photocatalytic oxidation. The photocatalytic reaction setup is introduced for the assessment of the indoor air quality. A modified TiO₂ that can be activated with visible light (VIS) is used as photocatalyst due to the shortage of UV light in indoor condition. One special wall paper is applied as the substrate for the coating of the photocatalyst in the present study.Nitric oxide (NO) is one typical indoor air pollutant, which is used as target pollutant for the photocatalytic oxidation with indoor concentration level. Influential parameters like initial NO concentration, flow rate, relative humidity of the experimental environment, irradiance, photocatalyst dosage that can affect the PCO are studied. Furthermore, the second part content of the present study is introduced at the end of this paper.     

Molecule assembly of heterostructured TiO2@BiOCl via fenton-like reaction for enhanced solar energy conversion

In this work, we applied the fenton-like reaction to fabricate TiO₂ nanocrystalline, and employed molecular self-assembly with TiO₂ and BiOCl to form composite photocatalyst with cookie-like nano-heterostructure for enhanced solar energy to hydrogen. The TiO₂@BiOCl photocatalyst with cookie-like nano-heterostructure exhibited excellent photocatalytic performance for the photocatalytic hydrogen evolution under sunlight irradiation compared to the single TiO₂ or BiOCl. Besides, the TiO₂@BiOCl photocatalyst displayed outstanding reusability and stability in the photocatalytic reaction. Meanwhile, the possible mechanisms of cookie-like nano-heterostructure formation and photocatalytic redox reaction have been proposed. What's more, this work demonstrated a new perspective for the design and mass preparation of TiO₂-based composite photocatalytic materials at atmospheric condition, which demonstrated that this method has enormous potential to achieve mass preparation of efficient photocatalyst for photocatalytic application.     

Ag nanoparticles-polypyrrole-carbon black/mesoporous TiO2 novel nanocomposite as ultrafast visible-light-driven photocatalyst

Effective design and fabrication of novel visible light-oriented photocatalysts is an existing challenging task that requires further dedicated efforts, and it has been always a main concern among the scientific community. This study deals with the design and fabrication of an extremely active and ultrafast ternary photocatalyst based on Ag nanoparticles, polypyrrole doped carbon black (PPy-C) and mesoporous TiO₂ (m-TiO₂). Sol-gel methodology along with sonication and photodeposition routes have been employed for the successful creation of the ternary framework. Ternary photocatalyst composed of uniform spherical titania nanoparticles (10–15 nm in size) perfectly intermingled with the polymeric linkage of PPy-C. Fruitful creation of unique trio photocatalyst between AgNPs, PPy-C and m-TiO₂ was confirmed by XPS and XRD. FTIR analysis further supports the development of nanocomposite photocatalyst. TEM analysis showed uniform spherical m-TiO₂ nanoparticles (10–15 nm in size) covered by PPy-C with compact nodes like appearance interlocked very well among each other. The newly developed Ag@PPy-C/m-TiO₂ ternary photocatalyst exhibited band gap energy in desired visible range of spectra. The photocatalytic efficiency for all created photocatalysts has been evaluated taking Imidacloprid (insecticide derivative) and methylene blue (MB) dye as target pollutants. The novel Ag@PPy-C/m-TiO₂ photocatalyst produced astonishing results with ultrafast removal of both Imidacloprid as well MB dye under visible light irradiation. The newly created ultrafast Ag@PPy-C/m-TiO₂ photocatalyst has removed 96.0% of the insecticide Imidacloprid in only 25 min with almost ? 2.65 times more efficient than bare m-TiO₂ towards the removal of insecticide derivative. The present report offers a highly encouraging and vastly talented Ag@PPy-C/m-TiO₂ ternary photocatalyst, enabling the ideal management of extremely lethal and notorious chemicals.