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Synthesis plasmonic Bi/BiVO4 photocatalysts with enhanced photocatalytic activity for degradation of tetracycline (TC)
摘要： In recent years, the excessive use of antibiotics has become a serious problem for human health. BiVO4 regarded as one of the most promising visible-light-driven photocatalysts was used to degrade the antibiotics. In this paper, we fabricated Bi/BiVO4 plasmonic photocatalysts which enhanced the photocatalytic activity of BiVO4 for degradation of tetracycline (TC) antibiotic. The Bi/BiVO4 photocatalysts were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy and high-resolution transmission electron microscopy. In addition, the photocatalytic experiment results show that the 0.04-Bi/BiVO4 sample has the best photocatalytic activity for 2 times than the pure BiVO4 photocatalyst. The cycle experiments, after four repetitions of the experiments, showed the sample still maintained a high photocatalytic activity. Finally, the photocatalytic reaction mechanism was also studied by free radical capture experiments and electron paramagnetic resonance spectroscopy.
关键词： Photocatalysts,Tetracycline (TC),Bi/BiVO4,Plasmonic,Visible light
更新于2025-09-12 10:27:22
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Novel up-conversion carbon quantum dots/α-FeOOH nanohybrids eliminate tetracycline and its related drug resistance in visible-light responsive Fenton system
摘要： In this study, novel up-converted carbon quantum dots (CQD) incorporated goethite (α-FeOOH) nanohybrids (CQDs/α-FeOOH) were fabricated via a facile hydrolysis method. CQDs/α-FeOOH exhibited remarkably degradation efficiency towards tetracycline (TC, 0.1503 min-1), approximately 3.7 times than pristine α-FeOOH with much lower amount of H2O2 (0.5 mM) under visible light irradiation (λ＞420 nm). The quenching and electron spin resonance (ESR) tests proved ·OH, O2·- and 1O2 were involved in TC degradation in CQDs/α-FeOOH catalyzed Fenton system. The potential Ultraviolet-Visible-Infrared (UV–vis-IR) broad-spectrum responsive properties of CQDs/α-FeOOH were proved in degradation various surface charged organic contaminants regarding the function of coupling up-conversion CQDs. CQDs/α-FeOOH also exhibited wide application pH, excellent durability, fairly good catalytic performance within different practical water matrices and completely eliminated related drug resistance of TC even under real solar-light conditions. The good biocompatibility makes CQDs/α-FeOOH served as a promising photocatalyst for remediation of water contamination with efficient utilization of solar energy.
关键词： Up-conversion effect,Goethite,Heterogeneous Fenton reaction,Carbon quantum dots,Tetracycline
更新于2025-09-12 10:27:22
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A novel poly(triazine imide) hollow tube/ZnO heterojunction for tetracycline hydrochloride degradation under visible light irradiation
摘要： A novel poly(triazine imide) hollow tube (PTI)/ZnO heterojunction was prepared by a molten salts method. The photocatalyst was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV–vis diffuse reflectance spectroscopy (DRS) and photoluminescence (PL) spectroscopy, respectively. The results showed the ZnO nanoparticles were successfully coupled into the PTI hollow tube to form PTI/ZnO heterojunction. The degradation of tetracycline hydrochloride (TC) under visible light irradiation was used to evaluate the activity of photocatalyst. The PTI/ZnO-6 wt% heterojunction exhibits the highest photocatalytic activity, which can degrade almost all TC within 90 min. The kinetic constant of degradation reaction with PTI/ZnO-6 wt% heterojunction (0.034 min?1) is about 5 times as high as that of the PTI (0.0070 min?1). A possible photocatalytic mechanism for heterojunction according to the energy-band theory was proposed.
关键词： ZnO,Tetracycline hydrochloride,Visible light photocatalytic,Poly(triazine imide),Hollow tube
更新于2025-09-10 09:29:36
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Synthesis of In2S3/UiO-66 hybrid with enhanced photocatalytic activity towards methyl orange and tetracycline hydrochloride degradation under visible-light irradiation
摘要： In this study, a series of In2S3/UiO-66 (ISU) hybrids have been fabricated through the growth of In2S3 nanoparticles onto the surface of UiO-66 via a facile hydrothermal process. The as-obtained samples have been characterized by PXRD, SEM, TEM, XPS, UV–Vis DRS, PC, PL and BET. The photocatalytic performance is evaluated by methyl orange (MO) and tetracycline hydrochloride (TCH) degradation under visible light irradiation. The results show that the In2S3/UiO-66 hybrids exhibit a higher photocatalytic activity than that of the pure In2S3 and UiO-66. Interestingly, the ISU-40% possesses the highest photodegradation e?ciency towards MO and TCH, which can be attributed to the strong visible light absorption, high speci?c surface area as well as e?ective separation of photo-generated electrons and holes. In addition, the photocatalysis mechanism in MO degradation process is also explored.
关键词： Hybrids,Visible light,In2S3/UiO-66,Methyl orange,Photocatalysis mechanism,Tetracycline hydrochloride
更新于2025-09-10 09:29:36
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The preparation of self-floating Sm/N co-doped TiO2/diatomite hybrid pellet with enhanced visible-light-responsive photoactivity and reusability
摘要： Powdery photocatalyst has long been studied, yet its several disadvantages such as light-harvesting and recyclability in suspension system are the bottlenecks for practical application. The recent report on floating photocatalyst provided an alternative method to solve the above problem. In this paper, TiO2 nanoparticles were co-doped by samarium and nitrogen, and then supported onto natural porous mineral diatomite via sol-gel method. The composite powder was granulated to produce self-floating pellet catalyst (Sm/N co-doped TiO2/diatomite hybrid pellet), denoted as SN-TDHP. Its various physicochemical properties such as light absorbance, crystallinity, surface condition as well as morphology were systematically analyzed. The synergy between Sm and N dopants, as well as diatomite and TiO2 were studied. The photoactivity of SN-TDHP was investigated via the degradation towards an antibiotic tetracycline (TC) solution under visible light, and then the optimal co-doping amount and pellet dosage were determined. The optimal pellet catalyst presented its removal rate of TC as 87.2% within 150 min of reaction time. Moreover, self-floating SN-TDHP could simply be filtrated from the surface of water matrix, and presented good reusability after 5 repetitions.
关键词： Visible light,Self-floating,Tetracycline,Sm/N co-doped,Diatomite
更新于2025-09-09 09:28:46
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Enhanced photocatalytic performance of sphere-like AgCl/ rGO catalysts under simulated and natural sunlight irradiation
摘要： Here we prepared sphere-like AgCl by stirring in the presence of sodium oleate, and loaded it on the surface of reduced graphene oxide (rGO) to form sphere-like AgCl/ rGO composite. Sphere-like AgCl exhibited enhanced degradation e?ciency after the inserting of rGO with degrading 80.6% of tetracycline (TC) within 90 min, which was about 15.4% higher than pristine spherical AgCl (65.2%) under simulated sunlight irradiation. Moreover, ?ve times cycling test of the obtained samples had revealed the improved stability of AgCl/ rGO. The remarkable photocatalytic activity was mainly due to the better interaction between AgCl and rGO, where charge separation and transfer as well as the utilization of sunlight were boosted. Improved photocatalytic stability was majorly ascribed to the fast electrons transfer from AgCl to rGO before the reduction of Ag+ to Ag. Besides, a possible photocatalytic reaction mechanism under simulated sunlight was proposed. Meanwhile, AgCl/ rGO also exhibited better photocatalytic e?ciency for the degradation of TC under natural sunlight irradiation (73.2%), which is hopeful for practical application of photocatalysts.
关键词： Natural sunlight irradiation,Sphere-like AgCl/ rGO,Tetracycline,Photocatalyst
更新于2025-09-09 09:28:46
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TiO2-SiO2-PMMA Terpolymer Floating Device for the Photocatalytic Remediation of Water and Gas Phase Pollutants
摘要： Floating photocatalytic devices are highly sought-after as they represent good candidates for practical application in pollutant remediation of large water basins. Here, we present a multilayer floating device for the photocatalytic remediation of contaminants present in water as well as of volatile species close to the water surface. The device was prepared on a novel tailored ter-polymer substrate based on methylmethacrylate, α-methylstyrene and perfluoroctyl methacrylate. The ad hoc synthesized support presents optimal characteristics in terms of buoyancy, transparency, gas permeability, mechanical, UV and thermal stability. The adhesion of the TiO2 top layer was favoured by the adopted casting procedure, followed by a corona pre-treatment and by the deposition of an intermediate SiO2 layer, the latter aimed also at protecting the polymer support from photocatalytic oxidation. The device was characterized by contact angle measurement, UV-vis transmittance and scanning electron microscopy. The final device was tested for the photocatalytic degradation of an emerging water pollutant as well as of vapors of a model volatile organic compound. Relevant activity was observed also under simulated solar irradiation and the device showed good stability and recyclability, prospecting its use for the photocatalytic degradation of pollutants in large water basins.
关键词： titanium dioxide,tetracycline,ethanol,composite,photocatalytic oxidation,polymethylmethacrylate
更新于2025-09-09 09:28:46
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Zeolitic Imidazolate Framework 8-derived Au@ZnO for Efficient and Robust Photocatalytic Degradation of Tetracycline
摘要： Tetracycline (TC) and other antibiotics accumulated in groundwater and soil pollutes ecological environment and threaten human health. Gold nanoparticles doped on photocatalysts are able to enhance the photodegradation efficiency during removing these antibiotics, but preparation of Au nanoparticles of well-dispersion on photocatalysts remains challenging. In this work, zeolite imidazolate (ZIF-8) was employed as the precursor to prepare Au@ZnO photocatalyst via impregnation and in-situ reduction method to efficiently degrade the tetracycline in the aqueous solution. Au nanoparticles are of 10 nm in size and uniformly dispersed on the surfaces of ZnO microstructures. The as-prepared Au@ZnO is able to remove 85.5% of TC of 0.010 mg/mL within two hours, of higher photocatalytic activity than pure ZnO catalyst. Most importantly, the catalyst shows its superior stability after five cycles without structure and activity changing. The mechanism of the photocatalytic degradation was discussed in detail.
关键词： ZIF-8,Au@ZnO,degradation,tetracycline,photocatalytic
更新于2025-09-09 09:28:46
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Integrating the plasmonic effect and p-n heterojunction into a novel Ag/Ag2O/PbBiO2Br photocatalyst: Broadened light absorption and accelerated charge separation co-mediated highly efficient visible/NIR light photocatalysis
摘要： Among several factors that influence the effectiveness of a semiconductor mediated photocatalysis, efficient charge separation and broadened light absorption are regarded as two of the most important parameters. Herein, a series of plasmonic p-n heterojunction Ag/Ag2O/PbBiO2Br photocatalysts with wide spectrum responses were successfully fabricated through a facile precipitation-calcination method. The obtained samples display exceptional photocatalytic performance for the degradation of tetracycline (TC), and the results reveal that the 10 wt% Ag/Ag2O/PbBiO2Br exhibits the optimal activity, which can efficiently decompose 84.4% of TC after 90 min of visible light irradiation. While under NIR light irradiation, the TC removal ratio can still reach 50.9% with 240 min. Besides, no significant deterioration in the degradation performance is observed even after four cycling runs. The photoactivity enhancement of Ag/Ag2O/PbBiO2Br can be credited to the synergistic effect between the local surface plasmon resonance (LSPR) effect of metallic Ag and the p-n heterojunction of Ag2O/PbBiO2Br, which not only greatly broadens the light utilization, but also remarkably accelerates the charge separation. The radical trapping experiments and the ESR measurements ascertains that %O2?, h+ and %OH play a critical role in the degradation of TC under visible light irradiation, while %O2? and h+ become the major reactive species in NIR light-driven reaction. According to the experimental results, the plausible reaction mechanisms for TC degradation over Ag/Ag2O/PbBiO2Br composite are proposed under both visible and NIR light irradiation. This work provides some guidance for rational construction of novel plasmonic p-n heterojunction photocatalysts to meet ever-increasing environmental requirements.
关键词： Surface plasmon resonance,Photocatalysis,P-n heterojunction,Tetracycline
更新于2025-09-09 09:28:46
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Microcystis aeruginosa Synergistically Facilitate the Photocatalytic Degradation of Tetracycline Hydrochloride and Cr(VI) on PAN/TiO2/Ag Nanofiber Mats
摘要： Cyanobacterial blooms can cause serious damage to aquatic ecosystems. However, we have demonstrated that typical algae-blooming species Microcystis aeruginosa (M. aeruginosa) combined with photocatalysts could synergistically facilitate the photodecontamination of tetracycline hydrochloride (TC) and Cr(VI). In this study, for the first time, harmful algae were successfully converted into photoreactive bionano hybrid materials by immobilizing M. aeruginosa cells onto polyacrylonitrile (PAN)-TiO2/Ag hybrid nanofibers, and their photocatalytic activity was evaluated. The addition of M. aeruginosa significantly improved the photodecontamination, and the reaction rate constant (k) values of TC and Cr(VI) degradation by M. aeruginosa-PAN/TiO2/Ag nanofiber mats were 2.4 and 1.5-fold higher than that of bare PAN/TiO2/Ag nanofiber. Photoreaction caused damage to algae cells, but no microcystin was found that had been photodegraded simultaneously. The effects of various active species were also investigated, and the photodegradation mechanism was proposed. Recycling tests revealed that this flexible M. aeruginosa-PAN/TiO2/Ag hybrid mat had potential application in the removal of mixed organic and inorganic pollutants with high efficiency and without secondary pollutants. Thus, harmful algae blooms could serve as an efficient materials to remove toxic pollutants in a sustainable way under visible light irradiation.
关键词： Ag nanoparticles,PAN nanofiber,Cr(VI),tetracycline,TiO2 photocatalytic,Microcystis aeruginosa
更新于2025-09-04 15:30:14