- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Sono-solvothermal fabrication of ball-flowerlike Bi2O7Sn2-Bi7O9I3 nanophotocatalyst with efficient solar-light-driven activity for degradation of antibiotic tetracycline
摘要： A novel Bi2O7Sn2-Bi7O9I3 nano-heterostructure photocatalyst with the different weighted percentages and as I-type heterojunction, which acts as pseudo-type II heterojunction, were successfully synthesized using sono-solvothermal manner for the first time. The coupled nanophotocatalysts with various weighted contents of Bi2O7Sn2 and Bi7O9I3 were characterized with XRD, FESEM, EDX, DRS, BET-BJH and pHpzc analyses. Meanwhile, the photocatalytic activity of various nanocomposites was evaluated in the remediation of the antibiotic tetracycline after 90 min irradiation. Results depicted that the ball-flowerlike Bi2O7Sn2(60)-Bi7O9I3(40) nanophotocatalyst, as a mesoporous structure and the type I-heterostructure which appears as an efficient solar-light-driven pseudo-type II heterojunction, represented the best photocatalytic efficiency. This is addressed by the suitable absorption of light range, high separation of charge carriers and its large surface area which provide more active sites for absorption of tetracycline molecules. Furthermore, to elucidate the how the influence of various parameters on the photodegradation efficiency, the different experiments were conducted over Bi2O7Sn2(60)-Bi7O9I3(40). The high activity was obtained in the medium with pH = 6, catalyst loading = 1 g/L and tetracycline concentration = 35 mg/L. Moreover, the capable of reusability and reaction mechanism of improved photodegradation on mentioned photocatalyst were investigated.
关键词： Sono-solvothermal,Water treatment,Antibiotic tetracycline,Photodegradation,Bi2O7Sn2-Bi7O9I3 nanophotocatalyst
更新于2025-09-23 15:22:29
-
A comprehensive study on the enhanced photocatlytic activity of a double-shell mesoporous plasmonic Cu@Cu2O/SiO2 as a visible-light driven nanophotocatalyst
摘要： A novel sunlight-activated double-shell Cu@Cu2O/SiO2 (m-pCu@Cu2O/SiO2) photocatalyst is presented via a combined precipitation and sol-gel methods with a mesoporous silica outer shell. After applying several characterization techniques on the m-pCu@Cu2O/SiO2, it was tested in the photodegradation of ciprofloxacin (CIP). The experimental results demonstrated a higher photocatalytic activity of the double-shell m-pCu@Cu2O/SiO2 nanophotocatalyst than the core-shell pCu@Cu2O nanophotocatalyst under the sunlight irradiation. When the content of pCu@Cu2O was 30 wt.%, it showed the highest activity. The Cu nanoparticles exhibited the surface plasmonic resonance (SPR) effect which increased the light absorption in the visible region of light. It also caused the rapid separation of the photoexcited e?/h+ pairs. Furthermore, the mesoporous structure of outer shell silica favors the transfer of reactants, resulting in the improved photoactivity performance for the supported pCu@Cu2O catalyst. Central composite design (CCD) based on RSM (response surface methodology) approach was used to optimize four of the most important experimental variables. The photodegraded intermediates were identified by HPLC-Mass.
关键词： Plasmonic,Response surface methodology,Ciprofloxacin,Mesoporous,Double-shell,Nanophotocatalyst
更新于2025-09-23 15:21:01
-
Study on the controlled synthesis of Zr/TiO2/SBA-15 nanophotocatalyst and its photocatalytic performance for industrial dye reactive red Xa??3B
摘要： Nanophotocatalytic technology is one of the most promising technologies to treat industrial dyes in waste water. Nanosized TiO2 was loaded on mesoporous SBA-15 molecular sieve by chemical method to prepare TiO2/SBA-15 (TS1) in this work. Then, the transition metal element Zr was further deposited on the surface of TS1 to obtain Zr/TiO2/SBA-15 (ZTS) nanophotocatalysts. The crystal structure, morphology, element distribution and pore size distribution of several samples were studied using small-angle x-ray scattering, X-ray diffraction, Transmission electron microscope, Scanning electron microscope, X-ray photoelectron spectroscopy, N2 adsorption-desorption, UV–Vis diffuse reflectance spectroscopy. The photocatalytic performance of the nanophotocatalyst was evaluated by photocatalyzing reactive red X–3B. The results show that the ZTS nanophotocatalyst has a good mesoporous structure, wherein, the TiO2 is an anatase phase. The specific surface of ZTS reaches 538.24 m2/g and its spectral absorption threshold reaches 425 nm. When the deposition amount of Zr is moderate the ZTS nanophotocatalyst shows quite high photocatalytic activity. In pH 2–10, the photocatalytic activity of ZTS exhibits change with variation of pH value. Under proper conditions, the degradation rate of reactive red X–3B reaches about 96% in ZTS photocatalytic system. Therefore, ZTS nanophotocatalyst has great potential in the treatment of dye wastewater.
关键词： Nanophotocatalyst,Reactive red X–3B,Mesoporous material,Zr,TiO2
更新于2025-09-23 15:19:57
-
Sono-photodeposition of Ag over sono-fabricated mesoporous Bi2Sn2O7-two dimensional carbon nitride: Type-II plasmonic nano-heterojunction with simulated sunlight-driven elimination of drug
摘要： The mesoporous Ag/Bi2Sn2O7-C3N4 plasmonic nanophotocatalyst, which synthesized by the hybridization method of sono-dispersion and heat-treatment following with the sono-photodeposition, was applied as an efficient solar-light-driven photocatalyst for degradation of Tetracycline (TC) antibiotic. Also, the Bi2Sn2O7, g-C3N4, Bi2Sn2O7-C3N4, Ag/Bi2Sn2O7 and Ag/C3N4 nanophotocatalysts were synthesized to compare. The characterizations of samples were conducted using XRD, morphology analyses such as FESEM, TEM and AFM, EDX and dot mapping, BET-BJH, FTIR, DRS and pHpzc. The results of morphology analyses showed that about 75.2% of nanoparticles are at the range of 10-20 nm and the minimum and maximum particle sizes were 6.9 nm and 42.2 nm respectively. Moreover, the cubic Ag particles size was about 25.7 nm. Besides, the results of the UV-vis diffuse reflectance spectroscopy analysis illustrated the promotion of the absorption edge of Ag/Bi2Sn2O7-C3N4 (at about 521nm) following with the decrement of band gap (2.38 eV). The photocatalytic activity of Ag/Bi2Sn2O7-C3N4 was obtained higher than other samples (89.1%) due to Bi2Sn2O7-C3N4 type-II heterojunction, porous structure with high specific surface area (66 m2/g) owing to the usage of ultrasonic energy and surface plasmon resonance created using the Ag particle. Moreover, experiments were carried out to investigate the effect of various parameters such as the photocatalyst dosage, initial concentration and pH of TC solution in removing the contaminate molecule from aqueous solution under the light illumination, which was simulated as sunlight, in the presence of photocatalyst and the possible elimination mechanism was proposed for pollutant removal.
关键词： Sono-Hydrothermal,Solar-Light-Driven,Photo-Deposition,Ag/Bi2Sn2O7-C3N4 Nanophotocatalyst,Tetracycline Degradation
更新于2025-09-12 10:27:22
-
Grain-like bismuth-rich bismuth/bismuth oxychlorides intra-heterojunction: Efficacious solar-light-driven photodegradation of fluoroquinolone antibiotics and 2-level factorial approach
摘要： The grain-like BiOCl (60%)–Bi 24 O 31 Cl 10 (40%) intra-heterojunction nanophotocatalyst was fabricated by a facile one-pot combustion route using sorbitol fuel. It was characterized by the utilization of XRD, FESEM, PSD, BET–BJH and DRS, which proved its successful synthesis. The solar-light-driven photocatalytic activity of BiOCl (60%)–Bi 24 O 31 Cl 10 (40%) was appraised through the destruction of fluoroquinolone antibiotics (FQAs) such as ciprofloxacin, ofloxacin and levofloxacin as persistent and resisting emerging pollutants in an aqueous solution. Consequences obtained were implied to its prominent performance. To investigate the individual and interplay influences of the input operating parameters (catalyst loading, initial pollutant concentration, initial pH and reaction time), the modelling of the photocatalytic destruction of ofloxacin as the response was done by 2-level full factorial experimental design approach. A semi-empirical fourth-order regression model with R 2 = 0.9878 was expressed to relate between the response and independent variables. Results obtained of the mentioned approach demonstrated the high adequacy of the model. The influence of individual parameters and their interactions on the photocatalytic degradation efficiency of ofloxacin was possessed by the main effect graphs, contour and response surface plots. This study not only illustrates a hopeful application of the grain-like BiOCl–Bi 24 O 31 Cl 10 in the solar-light-driven photo-destruction of resistant pollutants such as FQAs but also shows the favourable direction to gain the high-performance.
关键词： Simulated solar light,2-level factorial approach,Rich–bismuth oxychlorides,Grain-like nanophotocatalyst,Fluoroquinolone antibiotics
更新于2025-09-10 09:29:36
-
Application of ZnO-Ag-Nd nanocomposite as a new synthesized nanophotocatalyst for degradation of the organic compounds: Kinetic, thermodynamic, and economic study
摘要： In the present research, a zinc oxide (ZnO)–silver (Ag)–neodymium (Nd) nanocomposite was synthesized via the combustion method for the degradation of dyes as organic pollutants. The synthesized nanophotocatalyst was characterized using X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy techniques. The process of organic pollutant (Acid Red 18) removal was carried out in a semi-batch photoreactor equipped with an ultraviolet lamp. Also, the influence of key operational parameters such as pH, temperature, initial concentration of solution, and nanophotocatalyst dosage was investigated to evaluate kinetic and thermodynamic properties. Under optimum process conditions (pH ? 6.21, dosage of nanophotocatalyst ? 0.08 g/l, and low initial concentration of the solution), degradation of pollutant was monitored by measuring the total organic carbon of the solution. Finally, an economic study showed that the photocatalytic advanced oxidation process is an viable treatment method for low concentrations of organic pollutants.
关键词： wastewater treatment,degradation,organic pollutant,Nanophotocatalyst
更新于2025-09-10 09:29:36