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Effects of Operating Parameters on Photocatalytic Degradation of Methylene Blue or Phenol on Supported Titanium-Based Catalysts
摘要： Photocatalytic decompositions of both methylene blue and phenol in aqueous solutions were conducted separately on titanium-based catalysts. The catalysts were prepared using impregnation method on different supports (SiO2, Al2O3 or ZSM-5) and titanium precursors (TiO2 or TiCl4). They were tested in visible light or UV irradiations of different wavelengths (254 and 365 nm). The physico-chemical characteristics of the catalysts were obtained using BET, XRD, FTIR and TGA. The supports surface areas and porosities showed insignificant decreased after impregnation with the active components. The diffraction patterns showed strong peaks that are assigned to titania anatase phase and weaker peak that indicated low concentration of rutile phase. Irrespective of the support, FTIR showed broad peaks of Ti-O-Ti linkages in TiO2 particles. The catalysts were found to be active in decomposition of either methylene blue or phenol from aqueous solutions. For both methylene blue and phenol, the removal trend is TiO2/SiO2<TiO2/Al2O3<<TiO2/ZSM-5.
关键词： Titania,Phenol,Precursors,Methylene blue,Supports,Photocatalysis
更新于2025-09-04 15:30:14
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Preparation of C60 Nanowhiskers/NiS2 Nanocomposites and Photocatalytic Degradation of Organic Dyes
摘要： [C60]Fullerene nanowhiskers/NiS2 nanocomposites were prepared by a reaction of NiS2 nanoparticles and C60 nanowhiskers. The C60 nanowhiskers (FNWs) were synthesized by a liquid-liquid interfacial precipitation method using solvent solutions, such as benzene and toluene saturated with C60 powder and isopropyl alcohol. The NiS2 nanoparticles were synthesized by a reaction of NiCl2·H2O and Na2S2O3·5H2O in deionized water under microwave irradiation. The C60 nanowhiskers/NiS2 nanocomposites were calcined in an electric furnace at 700 °C for 2 h. The C60 nanowhiskers/NiS2 nanocomposites were characterized by X-ray diffraction and UV-visible spectrophotometry. The C60 nanowhiskers/NiS2 nanocomposites were evaluated as a photocatalyst by UV-visible spectrophotometry in the degradation of organic dyes, such as methylene blue and brilliant green, under ultraviolet light at 365 nm.
关键词： [C60]Fullerene nanowhiskers,Brilliant green,NiS2 nanoparticles,Photocatalytic degradation,Methylene blue
更新于2025-09-04 15:30:14
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AIP Conference Proceedings [Author(s) PROCEEDINGS OF THE 3RD INTERNATIONAL SYMPOSIUM ON CURRENT PROGRESS IN MATHEMATICS AND SCIENCES 2017 (ISCPMS2017) - Bali, Indonesia (26–27 July 2017)] - Synthesis and photocatalytic activity of nanocomposite based on sodium alginate from brown algae with ZnO impregnation
摘要： The objective of this research is to synthesize nano sodium alginate-ZnO nanocomposite as photocatalyst to degrade methylene blue compounds. The successful synthesis of nano sodium alginate-ZnO nanocomposite was supported by the characterization of XRD (X-Ray Diffraction), FTIR (Fourier Transform Infrared), SEM (Scanning Electron Microscope) and TEM (Tunneling Electron Microscope). The first stage of the research was the synthesis of nano sodium alginate with particle size 140 nm and crystallinity index 38.78 % by XRD and TEM characterization, the obtained particle size was 146 nm x 61 nm. Nano ZnO particle size 38 nm, by XRD and TEM characterization the obtained particle size was 56.6 nm x 33.3 nm. The next stage of nanocomposite synthesis of nano sodium alginate was the impregnation with nano ZnO particle size 130 nm, by XRD and TEM characterization the particle size was 228.0 nm x 134.2 nm. The success was also supported by FTIR and SEM characterization. The final stage was the degradation of blue methylene using nano-sodium alginate-ZnO nanocomposite. The highest degradation percentage by nano sodium alginate-ZnO nanocomposite with zinc nitrate concentration of 0.075 M was 51.68% with the first order rate constant of 9.5 x10-3 /min.
关键词： methylene blue,nano ZnO,degradation,nanocomposite,nano sodium alginate
更新于2025-09-04 15:30:14
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Facile synthesis of Ag/ZnO metal–semiconductor hierarchical photocatalyst nanostructures <i>via</i> the galvanic-potential-enhanced hydrothermal method
摘要： Hierarchical metal–semiconductor nanostructures (NSs) composed of a backbone made of Ag nanowire and ZnO nanorod (NR) branches were successfully prepared using the galvanic-potential-enhanced hydrothermal method. A galvanic cell structure was formed between an Al bottle anode that was used as a hydrothermal reactor and an Ag NW cathode dispersed in a hydrothermal solution. As a result, the contact-potential-driven hydrothermal growth of the ZnO NRs on the sidewalls of the Ag NWs could be achieved. The morphological and microstructure characterization confirmed the formation of well-arranged hierarchical NSs composed of Ag NW trunk and ZnO NR branch structures. The photocatalytic properties of the hierarchical Ag/ZnO NSs were investigated by degrading methylene blue (MB) dye as a model pollutant. It was found that the hierarchical Ag/ZnO NSs demonstrated a more than two-fold faster degradation rate than the pristine ZnO NSs. The high-performance photocatalytic activity of the Ag/ZnO hierarchical NSs was attributed to the synergetic effect of the metallic Ag NWs and the ZnO NRs that enhanced the charge separation and diffusion by suppressing charge recombination, as well as enhanced reaction sites and light absorption.
关键词： methylene blue degradation,Ag/ZnO,photocatalytic activity,hierarchical nanostructures,galvanic-potential-enhanced hydrothermal method
更新于2025-09-04 15:30:14
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AIP Conference Proceedings [Author(s) SolarPACES 2017: International Conference on Concentrating Solar Power and Chemical Energy Systems - Santiago, Chile (26–29 September 2017)] - Study of self cleaning fabric modified by Cu doped TiO2 with the addition of tetraethyl orthosilicate (TEOS)
摘要： Study of self – cleaning fabric modified by Cu doped TiO2 with the addition of TEOS has been done to achieve high performance of self – cleaning fabric. TiO2 doped Cu were made by using Photo Assisted Deposition (PAD) method. After that, certain compositions of the water, TEOS and Cu – TiO2 catalyst with the TEOS variated are prepared to be padded by the fabric and then dryed in the oven at certain temperature. The addition of TEOS in fabric coating is to improved the catalyst performance in self – cleaning ability and photodegradation of methylen blue. After the fabric is made, then analyzed it by using FTIR. The photodegradation is tested by puting a small amount of fabric to a methylen blue solution for 2 hours to see its absorbance using UV – Vis Spectroscopy and the self – cleaning ability test is to put the fabric in a sludge dirt for several minutes then spray it with water. FTIR result showed that the addition of TEOS cause Ti – O – Si bond to be applied in the fabric. The fabric coated with doped TiO2 has better performance than the undoped on both MB photodegradation and self – cleaning ability. The MB photodegradation performance of fabric increased with the amount of TEOS up to 74.4% within 2 hours and the efficiency of sludge dirt self – cleaning of fabric increased with the amount of fabric up to 83% efficiency, which is the type of fabric cotton Cu – TiO2 1,2% Si was the best among the other type of fabrics.
关键词： photodegradation,TEOS,methylene blue,self-cleaning fabric,Cu doped TiO2
更新于2025-09-04 15:30:14
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“Titanium Oxide-Clay” as Adsorbent and Photocatalysts for Wastewater Treatment
摘要： A novel composite based on Titanium oxide and clays hydrothermally was synthesized to be used as substrate in advanced treatment of wastewaters. The treatment consists of one single step process combining photocatalysis and adsorption. The composite’s crystalline structure is investigated by X-ray diffraction and FTIR, while atomic force microscopy (AFM) and scanning electron microscopy (SEM) are used to analyze the surface morphology. The adsorption capacity and photocatalytic properties of the material are tested on pollutants matrix containing dye (Methylene Blue) and heavy metal (cadmium cation). The results under optimized conditions indicate a good removal efficiency using this novel composite material.
关键词： Cadmium cation,Methylene blue,Wastewater treatment,Nanocomposite
更新于2025-09-04 15:30:14
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Two bimetallic metal–organic frameworks capable of direct photocatalytic degradation of dyes under visible light
摘要： Two bimetallic metal–organic frameworks (MOFs), specifically {2[LiM(TDA)2(DMF)]·NH2+(CH3)2}n (M = Co (HNU-29) or Zn (HNU-30), TDA = 2,5-thiophenedicarboxylate), were synthesized by solvothermal methods. X-ray crystal structures of the two MOFs showed them to be isostructural. Thus, in both cases, the metal secondary building units were connected by TDA2? ligands to form a 3D framework whose structure can be simplified to the twofold interpenetrated dia net. HNU-29 showed excellent photocatalytic activity for the degradation of methylene blue (MB) under visible light even without the addition of H2O2 as an electron acceptor, remaining stable even after several cycles of reuse. The MB degradation followed first-order kinetics, and the photocatalytic degradation mechanism was found to be related to the effective ligand-to-metal charge transfer within the framework.
关键词： Photocatalysis,Methylene blue,Metal–organic frameworks,Visible light,Dye degradation
更新于2025-09-04 15:30:14
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Enhanced Photocatalytic degradation of methylene blue dye using CuS-CdS nanocomposite under visible light irradiation
摘要： The inorganic nanoparticles based semiconductor photocatalyst has attracted widespread attention for the practical applications in sustainable energy and environmental remediation due to its low cost, eco-friendly, high efficiency and ease of process. CuS, CdS and CuS-CdS nanocomposite photocatalysts have been successfully synthesized by a simple hydrothermal approach. The phase purity, composition and surface morphology of as synthesized nanomaterials were characterized using various analytical techniques. The photocatalytic activities of the as-prepared materials have been evaluated by the degradation of methylene blue (MB) dye in the presence of hydrogen peroxide (H2O2) which served as an oxidant under visible light irradiation. MB dye (10 ppm) was degraded by about 80%, 59% and 99.97% for CuS, CdS and CuS-CdS nanocomposite respectively at 10 min. The results demonstrate that CuS-CdS nanocomposite exhibited excellent photocatalytic activity as compared to the CuS and CdS is which mainly attributed to large surface area, narrow band gap, high adsorbing capacity of the dye and also low recombination of the photo-generated electrons and holes. Further, electrochemical impedance (EI) measurement revealed that as prepared CuS-CdS nanocomposite suggested that as compared to CuS and CdS, the CuS-CdS nanocomposite exhibits rapid migration of photo-induced charge carriers. In addition, the CuS-CdS nanocomposite demonstrated that good stability towards photocatalytic degradation even after repeated usage. Finally, a suitable photocatalytic reaction mechanism has been proposed to indicate the photocatalytic performance of the nanocomposite.
关键词： Methylene blue dyes,hydrogen peroxide,CuS-CdS,photocatalytic activity.,charge carrier
更新于2025-09-04 15:30:14
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In Vitro antimicrobial photoinactivation with methylene blue in different microorganisms
摘要： Aim: To evaluate the in vitro antimicrobial effects of photodynamic therapy (PDT). Methods: The microorganism indicators were: Candida albicans, Pseudomonas aeruginosa,Enterococcus faecalis and Staphylococcus aureus. A microbial pool was prepared (108 cells/mL), from which aliquots were transferred to culture plates for carrying out the PDT using methylene blue (50 μM) and low-power laser (660 nm, 100 mW and 9 J).The effect of methylene blue alone, low power laser and the absence of treatments were evaluated. Then, aliquots of 1 μL were plated in a media culture, the number of colony forming units (CFU/mL) was obtained and the data submitted to the F test (ANOVA) with Tamhane’s comparisons. Results:The laser radiation in the presence of methylene blue was able to eliminate 74.90% of C. albicans, 72.41% of P. aeruginosa, 96.44% of E. faecalis and 95.42% of S. aureus, thus statistically significant differences were found among the groups (p<0.001). Conclusions: PDT was effective in reducing the number of viable cells in the studiedmicroorganisms, especially E. faecalis and S. aureus.
关键词： microbiology,Enterococcus faecalis,methylene blue,endodontics,photodynamic therapy
更新于2025-09-04 15:30:14