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Effective synthesis of nanoscale anatase TiO <sub/>2</sub> single crystals using activated carbon template to enhance the photodegradation of crystal violet
摘要： Nanoscale anatase TiO2 single crystals were successfully synthesized using three kinds of activated carbon (AC) templates through a simple sol–gel method. The optimal photocatalyst (T‐WOAC) was obtained using wood‐based AC template. X‐ray diffraction, transmission electron microscopy and Brunauer–Emmett–Teller analyses revealed that T‐WOAC possessed a small crystallite size of 8.7 nm and a clear mesoporous structure. The photocatalytic properties of samples were then evaluated through photodegradation of crystal violet (CV). Results implied that the photocatalysts prepared using the AC templates exhibited superior photocatalytic activity to that of the original TiO2. This enhancement may be due to the small crystallite size, large specific surface area and pore volume of the catalysts prepared with ACs. T‐WOAC showed high photocatalytic activity, CV degradation of 99.01% after 120 min of irradiation and k = 0.03914 min?1, which is 3.9 times higher than that of the original TiO2 (k = 0.00994 min?1). This result can be mainly attributed to the application of WOAC with moderate specific surface area and pore volume to produce T‐WOAC. Alkaline conditions benefitted the photodegradation of CV over photocatalysts. This work proposes a possible degradation mechanism of CV and indicates that the fabricated photocatalysts can be used to effectively remove CV from aqueous solutions.
关键词： photocatalyst,anatase TiO2 single crystals,sol–gel,crystal violet,activated carbon
更新于2025-11-14 17:04:02
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Morphological effect of titanate nanostructures on the photocatalytic degradation of crystal violet
摘要： The heterogeneous photocatalysis using semiconductor nanocrystals is an important process in the field of water treatment since it is a low cost, environmentally friendly, and zero waste technique. In this work, titanate nanostructures (sheets, tubes, and wires) were prepared by simple hydrothermal method. All samples were characterized by X-ray diffraction, transmission electron microscopy, Brunauer–Emmett–Teller surface area analysis, and Zetasizer. The results revealed that tuning the morphology of TiO2 changed the activity of the prepared nanostructures, where titanate nanowires exhibited the highest photocatalytic activity toward crystal violet dye, reaching 100% at pH 3 under ultraviolet illumination for 35 min.
关键词： water-treatment,crystal violet,selectivity,Selective degradation,titanate,photocatalysis
更新于2025-09-19 17:15:36
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A study of spectro photo metric determination of ion association complex, formed by anionic surfactant sodium dodecyl by using crystal violet as a cationic dye in region Bilaspur (Chhattisgarh)
摘要： Surface active agents (SAA) with negative charge of polar group are named as anionic compounds. They are the main constituent of most products containing synthetic surfactants. Anionic surfactants after use are passed into sewage-treatment plants, where they are partially degraded and adsorbed to sewage sludge. Therefore, it is important to investigate the environmental fate of those classes of compounds in more details. A sensitive, selective and inexpensive method for the determination of anionic surfactants in waste water of sewage has been developed. This research involves determination the concentration of anionic surfactants sodium dodecyl sulphate (SDS) with use appropriated analytical techniques in environmental samples. The official methodology for determination of anionic surfactant (AS) in liquid samples is based on the ion-pair reaction of these analysts’ compounds with crystal violet (CV) and an extraction with organic solvent benzene. In an organic solvent benzene anionic surfactant SDS and a cationic dye CV forms an ion association complex. This ion associate exhibits an absorption maximum wave length (λ max) at 560 nm. The method proposed has been found much easier, accurate and rapid, and there is no use of any toxic chemicals.
关键词： crystal violet,Anionic surfactant,Surface active agents,Sodium dodecyl sulphate
更新于2025-09-10 09:29:36
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Highly sensitive, stable g-CN decorated with AgNPs for SERS sensing of toluidine blue and catalytic reduction of crystal violet
摘要： SERS substrates with high sensitivity, SERS enhancement and stability are essential for fabrication of SERS sensors to detect dyes at low concentration. Such substrates generally have a versatile support bonded to metal nanoparticles of optimum size. Simple methodology that yields SERS substrates with reproducible results is mostly desired for sensor fabrication. In this study, silver ions were reduced with safe reducing agent NaBH4 to Ag metal nanoparticles (AgNPs) in the presence of previously prepared g-CN to obtain g-CN decorated with silver nanoparticles (AgNPs@g-CN) of average diameter 22 nm. The results of XPS and UV–Vis spectroscopy unambiguously establish signi?cant interaction between the nitrogen sites of g-CN and AgNPs. The AgNPs@g-CN yielded very high SERS enhancement for toluidine blue at very low concentration (2.5 9 10-09 M), and the SERS results are reproducible. The surface enhancement factor (EF) is one of the important criteria to evaluate and compare SERS materials, and it was equal to 9.13 9 106 toward toluidine blue. The catalytic activity of the substrate for the reduction of crystal violet (CV) to its leuco-form was tested with NABH4. The reaction was monitored by UV Vis spectroscopy. There was a rapid fall in intensity of CV. The reduction of CV mainly occurred via electron transfer from AgNPs, and the product did not interfere with the absorbance of CV. Hence, AgNPs@g-CN could be a convenient choice for fabrication of commercial SERS sensors for detection of dyes at low concentrations. It is also useful as a catalyst for the reduction of organic dyes.
关键词： g-CN,crystal violet,SERS,toluidine blue,AgNPs,catalytic reduction
更新于2025-09-04 15:30:14