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Effective Removal of Tetracycline by Using Bio-Templated Synthesis of TiO2/Fe3O4 Heterojunctions as a UV–Fenton Catalyst
摘要： Novel maize-straw-templated TiO2/Fe3O4 hierarchical porous composites were synthesized by high-temperature calcination followed by a hydrothermal process. The composites were demonstrated to be efficient heterogeneous catalysts for the UV–Fenton-like degradation of TC. The results show that the as-prepared TiO2/Fe3O4 catalysts retain the original pore morphology of the maize-straw material, and a large amount of Fe3O4 particles are attached to the TiO2 surfaces. The as-prepared TiO2/Fe3O4 heterojunctions have abundant interfacial boundaries, which greatly improve the migration of photoexcited charges across different components. Consequently, in the UV–Fenton system, the TiO2/Fe3O4 catalysts exhibit significant activity towards the degradation of TC (50?mg/L) in a wide pH range. In particular, a maximum mineralization and TC removal of 98% is achieved within 60?min at pH 7.0, which is much higher than that of traditional Fe3O4-based UV–Fenton (81%) and TiO2 photocatalysis (23%). The enhanced degradation and mineralization of tetracycline is attributed to the efficient reduction of Fe3+ to Fe2+ by photo-generated electrons from the TiO2 skeleton of the TiO2/Fe3O4 heterojunction.
关键词： UV–Fenton,Biotemplated,TiO2/Fe3O4 heterojunction,Tetracycline degradation
更新于2025-09-23 15:21:21
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Photocatalytic degradation of tetracycline hydrochloride over rugby-like ?2-Ga <sub/>2</sub> O <sub/>3</sub> with a 3D hierarchically assembled porous structure for environmental remediation
摘要： A novel rugby-like β-Ga2O3 with 3D hierarchically assembled porous structures was successfully constructed through a facile precipitation-calcination method. The synthesized Ga2O3 materials were used to the photocatalytic degradation of tetracycline hydrochloride (TC·HCl) and the effects of calcination temperature on photocatalytic activity were discussed. The conversions of TC·HCl over Ga2O3-900 was 99.0% for Ga2O3-900 after 25 min UV-light irradiation, which was higher than those of commercial Ga2O3 (71.2%) and P25 (82.9%). The best photocatalytic activity of Ga2O3-900 could be attributed to the large specific surface area, intrinsic electronic properties and stable 3D hierarchically assembled porous structure. Based on the liquid chromatography quadrupole time-of-flight mass spectrometry (LC-QTOF-MS) analysis, the photocatalytic mechanism of Ga2O3 and feasible degradation pathway of TC·HCl were proposed. We believe that the present study can exploit an effective avenue to design the photocatalysts with 3D hierarchical porous structures to meet ever-increasing environmental remediation requirements.
关键词： β-Ga2O3,photodegradation pathway,nano-porous structures,tetracycline hydrochloride,optical properties
更新于2025-09-23 15:21:01
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The fabrication of self-floating Ti3+/N co-doped TiO2/diatomite granule catalyst with enhanced photocatalytic performance under visible light irradiation
摘要： Powdery photocatalyst has long been investigated and developed, yet its disadvantages such as low light-harvesting and reuse capability in suspension system have greatly hindered its practical application. The proposal of floating photocatalyst provided an alternative method to overcome the above limitations. In this work, TiO2 nanoparticles were doped by Ti3+ and N, and dispersed onto natural porous mineral diatomite via sol-gel method. The obtained black powder was granulated to produce floating granule catalyst (black Ti3+/N co-doped TiO2/diatomite hybrid granule), denoted as b/N-TDHG. The synergy between Ti3+ and N dopants, as well as diatomite and TiO2 were studied. The photoactivity of b/N-TDHG was investigated via the degradation of antibiotic tetracycline (TC) solution under visible light irradiation, and then the optimal co-doping amount and granule dosage were determined. The optimal granule catalyst presented its removal rate of TC as 92.0% within 150 min, and its rate constant was 0.0144 min?1, while the corresponding powdery sample showed the removal rate of TC as 90.5% during the same period, with its rate constant as 0.0135 min?1. Moreover, floating b/N-TDHG could simply be filtrated from TC solution, and the removal rate slightly dropped to 89.6% after 5 repetitions, presenting good reusability.
关键词： Ti3+/N co-doped,Diatomite,Visible light,Self-floating,Tetracycline
更新于2025-09-23 15:21:01
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Preparation of molecularly imprinted fluorescence sensor based on carbon quantum dots via precipitation polymerization for fluorescence detection of tetracycline
摘要： A facile and effective method was proposed to prepare the molecularly imprinted fluorescence sensor with carbon quantum dots, which were modified vinyl groups by acrylic acid on the surface. The obtained fluorescence composite material was investigated by transmission electron microscope and Fourier transform infrared spectra. After the experimental conditions were optimized, a linear range of 1.0–60 μmol L?1 was obtained and the detection limit was 0.17 μmol L?1. The novel fluorescence sensor can be successfully used to detect tetracycline in real samples. This study provides a convenient strategy for selective recognition and rapid detection of tetracycline in the complex environment.
关键词： precipitation polymerization,tetracycline,carbon quantum dots,molecularly imprinted polymers,fluorescence detection
更新于2025-09-23 15:19:57
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Response surface optimization of hydrothermal synthesis of Bismuth ferrite nanoparticles under supercritical water conditions: Application for photocatalytic degradation of Tetracycline
摘要： Ultra?ne bismuth ferrite (BiFeO3) powders have been successfully synthesized through supercritical water hydrothermal technique, in a batch type reactor. A Box–Behnken three-level experimental design was used to optimize the process variables a?ecting the BiFeO3 e?ciency includes pH of starting solution (1.5–12.5), reaction time (1–2 h), and reaction temperature (450–550 ℃). The samples were characterized via X–ray powder di?raction (XRD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The model was validated by analysis of variance (ANOVA) and conducting an experiment at optimal design conditions (temperature of 522 ℃, pH of 3.25 and 1.3 h). The maximum BiFeO3 production e?ciency which obtained at optimum condition was about 45%. The attained results showed good correlation between the predicted model and experimental data (Model P-Value = 0.0052). The present work con?rmed that the supercritical water hydrothermal method is a suitable way to produce BiFeO3 nanoparticles with a mean grain size of 60 nm and narrow size distribution. Moreover, the optical property of the product was investigated by Ultraviolet-visible di?use re?ectance spectroscopy (DRS). The attained nanostructures showed a narrow band gap of 1.96 eV, indicating that BiFeO3 powders can be applied as a novel visible-light-responsive photocatalyst for degradation of tetracycline (TC). Photocatalytic experiments revealed that using BiFeO3 nanoparticles, TC degradation e?ciency of 80.3% and 87.5% could be reached under UV and visible light radiations, respectively. Furthermore, it was found the degradation of TC follows the pseudo-second-order kinetics by BiFeO3.
关键词： Tetracycline,Bismuth ferrite nanoparticles,Photocatalyst,Supercritical water,Hydrothermal synthesis
更新于2025-09-23 15:19:57
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Visible-light-driven Ag/Bi <sub/>3</sub> O <sub/>4</sub> Cl nanocomposite photocatalyst with enhanced photocatalytic activity for degradation of tetracycline
摘要： In this study, a novel Ag/Bi3O4Cl photocatalyst has been synthesized by a facile photodeposition process. Its photocatalytic performance was evaluated from the degradation of tetracycline (TC) under visible light irradiation (λ > 420 nm). The 1.0 wt% Ag/Bi3O4Cl photocatalyst could significantly enhance the degradation of TC compared with pure Bi3O4Cl, with the degradation level reaching 94.2% in 120 minutes. The enhancement of photocatalytic activity could be attributed to the synergetic effect of the photogenerated electrons (e?) of Bi3O4Cl and the surface plasmon resonance (SPR) caused by Ag nanoparticles, which could improve the absorption capacity of visible light and facilitate the separation of photogenerated electron–hole pairs. In addition, electron spin resonance (ESR) analysis and trapping experiments demonstrated that the superoxide radicals (?O??), hydroxyl radicals (?OH) and holes (h?) played crucial roles in the photocatalytic process of TC degradation. The present work provides a promising approach for the development of highly efficient photocatalysts to address current environmental pollution, energy issues and other related areas.
关键词： photocatalyst,surface plasmon resonance,Ag/Bi3O4Cl,tetracycline degradation,visible light
更新于2025-09-19 17:15:36
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Construction of 1D Ag-AgBr/AlOOH Plasmonic Photocatalyst for Degradation of Tetracycline Hydrochloride
摘要： In this work, the highly ef?cient and low-cost Ag-AgBr/AlOOH plasmonic photocatalyst is successfully prepared via a simple and mild wet-chemical process and used for degrading high concentration methylene blue (MB) and tetracycline hydrochloride (TCH). The optimized 6-Ag-AgBr/AlOOH sample showed a 79% decomposition of TCH in 2 h, which is almost two times higher than that of bare AgBr (37%). For degrading MB, the photocatalytic activity of 6-Ag-AgBr/AlOOH (decomposing 84% in 2 h) showed a large enhancement as compared to bare AgBr (only 57%). The TEM, HRTEM, XRD, DRS, and XPS characterization results con?rm that Ag-AgBr is a composite catalyst formed by loading Ag nanoparticles onto AgBr surfaces and then loaded on to AlOOH. The possible mechanism proposed is that ?O?2 and ?OH radicals produced under sun light are the main active species for degrading MB and TCH. It is hoped that this work will open a new gateway to the synthesis of highly ef?cient and low-cost Ag-AgBr/AlOOH plasmonic photocatalysts for degrading organic pollutants.
关键词： tetracycline hydrochloride,degradation,Ag-AgBr/AlOOH,plasmonic photocatalyst,methylene blue
更新于2025-09-19 17:13:59
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pH-Controlled photocatalytic abatement of RhB by an FeWO <sub/>4</sub> /BiPO <sub/>4</sub> p–n heterojunction under visible light irradiation
摘要： A novel p–n heterostructure of an FeWO4/BiPO4 nanocomposite was designed and synthesized through a simple hydrothermal method. Among all the nanocomposites prepared with different weight percentages of FeWO4, 30% FeWO4/BiPO4 (S3) showed the highest photocatalytic performance for the degradation of Rhodamine B and tetracycline under visible light irradiation. The degradation efficiency of RhB for the S3 sample was 87% under neutral conditions within 300 min but interestingly, at pH 3, 99% degradation efficiency was observed within 30 min with good recyclability. The enhanced photocatalytic performance should be due to the maximum electron–hole pair decoupling efficiency of the S3 catalyst. The mineralization of RhB during the catalytic process was detected by GC-MS. Consequently, based on the experimental results, a possible photocatalytic mechanism over the FeWO4/BiPO4 composite was anticipated, which indicated the substantial potential of the composite for the treatment of textile and pharmaceutical wastewater.
关键词： p–n heterojunction,Rhodamine B,tetracycline,visible light irradiation,FeWO4/BiPO4,photocatalytic degradation
更新于2025-09-16 10:30:52
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An integrated approach for trace detection of pollutants in water using polyelectrolyte functionalized magneto-plasmonic nanosorbents
摘要： Resistance of pathogenic micro-organisms to conventional antibiotics is an essential issue for public health. the presence of such pharmaceuticals in aquatic ecosystems has been of major concern for which remediation and ultra-sensitive monitoring methods have been proposed. A less explored strategy involves the application of multifunctional nanosorbents for the uptake and subsequent detection of vestigial contaminants. in this study, colloidal nanoparticles (nps) of iron oxide and gold were encapsulated in multi-layers of a charged polyelectrolyte (pei: polyethyleneimine), envisaging the effective capture of tetracycline (TC) and its subsequent detection by Surface Enhanced Raman Scattering (SeRS). Adsorption studies were performed by varying operational parameters, such as the solution pH and contact time, in order to evaluate the performance of the nanosorbents for the uptake of tc from water. While the magnetic nanosorbents with an external pei layer (fe3o4@pei and fe3o4@PEI-Au@PEI particles) have shown better uptake efficiency for TC, these materials showed less SERS sensitivity than the fe3o4@pei- Au nanosorbents, whose SeRS sensitivity for tc in water has reached the limit of detection of 10 nM. Thus, this study highlights the potential of such magneto-plasmonic nanosorbents as multi-functional platforms for targeting specific contaminants in water, by taking into consideration both functionalities investigated: the removal by adsorption and the SeRS detection across the nanosorbents’ surfaces.
关键词： tetracycline,SERS detection,water pollutants,adsorption,magneto-plasmonic nanosorbents
更新于2025-09-16 10:30:52
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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