Journal of Environmental Chemical Engineering
·
2019
·
IF 0
Xiyang Liu,Fei Huang,Yide He,Yang Yu,Yong Lv,Yanhua Xu,Yongjun Zhang
The degradation behavior of oxytetracycline (OTC) in aqueous solution using sludge derived carbon (SC) was investigated in this paper. SC treated with different kinds of acids were characterized by BET and thermogravimetric analysis. The results showed that SC-H 2 SO 4 exhibited higher catalytic activity than SC-HCl and SC. The maximum removal of OTC and total organic carbon (TOC) after catalytic oxidation process at 60 °C was 92.6% and 70.2%, respectively. The safety of antibiotics after advanced oxidation processes (AOPs) has attracted much attention due to the possibility of toxicity increasing. Seven intermediate products were identified by GC–MS and four pathways were proposed. Furthermore, the toxicity of OTC degradation was investigated by zebrafish embryos for the first time. Zebrafish incubated with OTC solution (TE2) had haemagglutination, pericardial edema and showed significant changes in heartbeat, body length, and roaming frequency compared with the normal nutrient solution (TE1). Moreover, all zebrafish embryos had condensation phenomenon and did not hatch out in the treated OTC solution (TE3). In contrast, the zebrafish could hatch out without abnormality cultured with the treated OTC solution adjusted to the neutral pH (TE4). Results indicated that the treated OTC solution after catalytic oxidation process should be adjusted to the neutral pH to reduce the toxicity to the ecology.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 10
·9087-9096
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IF 2.195
Liu Minmin,Yu Shuili,Hou Li-an,Hu Xiaojun
A series of Fe 2 O 3 and TiO 2 immobilized on NZVI modified zeolite composites ((n)Fe 2 O 3 –TiO 2 /FeZ) were synthesized by a one-pot hydrothermal method combined with calcination for oxytetracycline (OTC) removal. Some of the zero valent iron particles (NZVI) were impregnated into the framework of zeolite X by hydrothermal method and others were oxidized to Fe 2 O 3 through calcination. The TiO 2 and Fe 2 O 3 particles were immobilized on the surface of zeolite X. Compared with pure Fe 2 O 3 –TiO 2 , the OTC adsorption and photocatalytic degradation efficiency of (n)Fe 2 O 3 –TiO 2 /FeZ increased sharply. As the weight ratio of NZVI to TiO 2 was six and four, the sample had the highest adsorption efficiency (95%) and showed the highest total efficiency (98%) via adsorption and visible light—driven photocatalytic activity for the degradation of OTC, respectively. The materials also had good cyclic stability and the removal efficiency reached up to above 80% after four runs. In addition, the photocatalytic mechanism was proposed. The improved photocatalytic activities and stabilities of (n)Fe 2 O 3 –TiO 2 /FeZ for OTC degradation were ascribed to the enhanced adsorption capacity of FeZ, the strong absorbance in the visible light region and improved photo-induced charge carriers separation.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 51
·40764-40771
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IF 3.84
Rong Li,Yuefa Jia,Jun Wu,Qiang Zhen
The degradation behavior of oxytetracycline (OTC) in aqueous solution using Fe2O3–TiO2 nanopowders (Fe2O3–TiO2 NPs) as photocatalysts under UV/visible light was investigated in this paper. Fe2O3–TiO2 NPs photocatalysts synthesized using co-precipitation were characterized by XRD, TEM, FT-IR and UV-vis DRS. Fe2O3–TiO2 NPs with 45 wt% Fe2O3 exhibited higher photocatalytic activity than others. The photocatalytic degradation of OTC shows a maximum efficiency at pH = 5.5 under both UV/visible light due to the surface adsorption. The intermediate products during the photocatalytic degradation of OTC were detected by LC-MS/TOF. Seven main intermediates were formed, and their evolution was discussed. On the basis of the evidence oxidative intermediate formation and a detailed degradation path way of OTC by 45 Fe2O3–TiO2 NPs are proposed.
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高影响因子
ANALYTICAL CHEMISTRY
·
2015
·
IF 5.636
Kai Yan,Yong Liu,Yaohua Yang,Jingdong Zhang
A novel cathodic “signal-off” strategy was proposed for photoelectrochemical (PEC) aptasensing of oxytetracycline (OTC). The PEC sensor was constructed by employing a p-type semiconductor BiOI doped with graphene (G) as photoactive species and OTC-binding aptamer as a recognition element. The morphological structure and crystalline phases of obtained BiOI-G nanocomposites were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The UV–visible absorption spectroscopic analysis indicated that doping of BiOI with graphene improved the absorption of materials in the visible light region. Moreover, graphene could facilitate the electron transfer of BiOI modified electrode. As a result, the cathodic photocurrent response of BiOI under visible light irradiation was significantly promoted when a suitable amount of graphene was doped. When amine-functionalized OTC-binding aptamer was immobilized on the BiOI-G modified electrode, a cathodic PEC aptasensor was fabricated, which exhibited a declined photocurrent response to OTC. Under the optimized conditions, the photocurrent response of aptamer/BiOI-G/FTO was linearly proportional to the concentration of OTC ranging from 4.0 to 150 nM, with a detection limit (3S/N) of 0.9 nM. This novel PEC sensing strategy demonstrated an ultrasensitive method for OTC detection with high selectivity and good stability.
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PubMed
高影响因子
ANALYTICAL BIOCHEMISTRY
·
2015
·
IF 2.219
Hui Zhang,Congcong Fang,Shijia Wu,Nuo Duan,Zhouping Wang
In this work, a biosensor based on luminescence resonance energy transfer (LRET) from NaYF 4 :Yb,Tm upconversion nanoparticles (UCNPs) to SYBR Green I has been developed. The aptamers are covalently linked to UCNPs and hybridized with their complementary strands. The subsequent addition of SYBR Green allows SYBR Green I to insert into the formed double-stranded DNA (dsDNA) duplex and brings the energy donor and acceptor into close proximity, leading to the fluorescence of UCNPs transferred to SYBR Green I. When excited at 980 nm, the UCNPs emit luminescence at 477 nm, and this energy is transferred to SYBR Green I, which emits luminescence at 530 nm. In the presence of oxytetracycline (OTC), the aptamers prefer to bind to its corresponding analyte and dehybridize with the complementary DNA. This dehybridization leads to the liberation of SYBR Green I, which distances SYBR Green I from the UCNPs and recovers the UCNPs' luminescence. Under optimal conditions, a linear calibration is obtained between the ratio of I 530 to I 477 nm ( I 530 / I 477 ) and the OTC concentration, which ranges from 0.1 to 10 ng/ml with a limit of detection (LOD) of 0.054 ng/ml.
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PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Hui Chen,Lingfei Yin,Yuan He,Liangtai Bai,Yuejun Wu,Yuanyuan Zhao,Febelyn Reguyal,Ajit K. Sarmah,Xing Yang,Chengjun Ge,Hailong Wang
The increasing presence of oxytetracycline (OTC) in agricultural soils has raised global environmental concerns. We investigated the environmental behavior and fate of OTC in two types of tropical agricultural soils, focusing on the impact of dissolved organic matter (DOM) from biogas slurry. Techniques such as three-dimensional excitation-emission matrix fluorescence spectroscopy (3D-EEM), Fourier Transform Infrared (FTIR), X-ray photoelectron spectroscopy (XPS), and Ultraviolet-visible spectrophotometer (UV–vis) were used to explore the adsorption mechanisms. Our findings revealed that biogas slurry-derived DOM decreased the OTC adsorption on soils and extended the time to reach adsorption equilibrium. Specifically, the equilibrium adsorption of OTC by the two soils decreased by 19.41 and 15.32 %, respectively. These adsorption processes were effectively modelled by Elovich, intraparticle diffusion, linear, and Freundlich thermodynamic models. Thermodynamic parameters suggested that OTC adsorption onto soils was spontaneous and endothermic, with competitive interactions between biogas slurry-derived DOM and OTC molecules intensifying at higher DOM concentrations. The adsorption mechanisms were governed by both physical and chemical processes. Furthermore, the presence of Ca 2+ and Na + ions significantly inhibited OTC adsorption. These insights advanced our understanding of the fate and risk of OTC in soil environments influenced by DOM, contributing to more informed agricultural and environmental management practices.
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PubMed
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Yi Tian,Wenbin Shi,Ping Yang,Xiao Zhang
Carbon dots (CDs) with high photoluminescence quantum yields (PLQYs) are expected to be used in sensors (e.g., metal ions and antibiotics). In this paper, aluminum-doped green-emitting CDs (M-Al-CDs) were prepared by a one-step solvothermal route using m-phenylenediamine. Al doping resulted in sample M-Al-CDs with enhanced green emission with a PLQY of 75.4% and related narrow photoluminescence (PL) spectra with a full width at half-maximum of 57 nm. The PLQYs of CDs increased by 2.3 times after Al doping. This phenomenon is ascribed to Al as a network former that can enter the carbon frameworks of CDs to affect the microstructure and PL. Highly crystalline CDs were created after Al addition, suggesting that the number of surface defects decreased and the radiation recombination efficiency increased. In addition, positive Al ions possess powerful coordination ability with the negative functional groups on the surface of CDs to further decrease nonradiational recombination, in which the Fourier transform infrared spectra of samples confirmed such interaction. Furthermore, these CDs also revealed excellent photo- and thermostability even after being stored at room temperature for 240 days. Sample M-Al-CDs exhibited a static quenching response to Cu2+ ions and oxytetracycline with detection limits of 0.1 and 1.0 μM, respectively. The specific detectability of M-Al-CDs for Cu2+ ions and oxytetracycline is related to the formation of stable complexes between M-Al-CDs and Cu2+ ions as well as to the interaction between Al ions and oxytetracycline. These results indicate an effective approach for the application of CDs as sensors.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Rongrong Yuan,Zibo Liu,Hao Sun,Hongming He
A ferriporphyrin-based porous organic framework (Fe-PPOF) was successfully synthesized via the Sonogashira coupling reaction. By reason of high surface area, extended π-conjugation skeleton and excellent stability, Fe-PPOF can efficiently immobilize aptamers to fabricate an electrochemical aptasensor for detecting ultra-trace oxytetracycline (OTC) with the low limitation of detection of 2.05 fg·mL −1 . Meanwhile, this biosensor exhibits high selectivity, good stability and available reproducibility. More importantly, the Fe-PPOF-based electrochemical aptasensor can quantitatively detect OTC in real samples.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
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IF 5.401
Yilin Wang,Pengjuan Ni,Shu Jiang,Wangdong Lu,Zhen Li,Hanmeng Liu,Jing Lin,Yujing Sun,Zhuang Li
In this paper, a novel, selective and eco-friendly biosensor has been fabricated and applied for sensitive detection of antibiotic oxytetracycline (OTC). This fluorescent biosensor was based on carbon quantum dots (CDs), H 2 O 2 and Fe 3 O 4 magnetic nanoparticles (Fe 3 O 4 MNPs). Herein, we firstly demonstrated that the fluorescence of CDs decreased apparently in the presence of OTC, H 2 O 2 and Fe 3 O 4 MNPs. The fluorescence quenching of CDs not only is caused by the hydroxyl radical produced from the Fenton reaction and complexation of Fe 3 O 4 MNPs with OTC, but also might be related to the inner filter effect (IFE) between CDs and OTC, which improved the selectivity and sensitivity of the fabricated biosensor. Under the optimal experiment conditions, the relative fluorescence intensity of the CDs decreased linearly with the increasing concentration of OTC from 25 nM to 1.75 μM. The detection limit of the fabricated biosensor on OTC was 9.5 nM at a signal-to-noise ratio of 3. Compared with other current protocols, the method described here displayed a few advantages including simplicity, low cost and rapid detection. The precision and reproducibility of the proposed sensor were also acceptable Significantly, the practicality of this sensitive sensor for OTC detection in drugs was further validated, revealing the advantages of high simplicity, sensitivity and selectivity. Hence, the developed biosensor might provide a useful and practical tool for OTC determination and related food safety analysis and clinical diagnosis.
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高影响因子
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2017
·Vol. 40
·期 2
·763-776
·
IF 2.616
Wang Lanjun,Wang Jinhua,Zhu Lusheng,Wang Jun
The production of commercial livestock and poultry often involves using with antibiotics and feed additives, such as oxytetracycline (OTC) and copper (Cu). These are often excreted into the soil by animal feces; hence, combined pollutants may contaminate the soil. To evaluate single and combined toxic effects of OTC and Cu on the soil ecology, changes in quantities of bacteria, fungi, and actinomycetes in the soil were studied over a 28-d incubation period by a plate count method, microbes numbers counted on days 7, 14, 21, and 28. Abundances of ammonia monooxygenase ( amoA ) gene expression by ammonia-oxidizing bacteria (AOB) and ammonia-oxidizing archaea (AOA) in soil samples also were tested by real-time polymerase chain reactions (RT-PCRs) on day 21. The results revealed that the numbers of bacteria, fungi and actinomycetes and amoA genes copies of AOA and AOB were reduced seriously by exposure to Cu (1.60 mmol/kg). Similarly, the combined pollution treatments (mole ratios of OTC: Cu was 1:2, 1:8, and 1:32) also had inhibitory effect on bacteria, fungi, and actinomycetes numbers and amoA gene copies of AOA and AOB; the inhibitory rate was on obvious growth trend with the increasing mole ratios. Effects from single OTC pollution were found on bacteria (days 7 and 14), fungi (days 7, 14, 21, and 28), and AOA- amoA gene copies (day 21), with promotion at a low concentration (0.05 mmol/kg) and suppression at higher concentrations (0.2 and 0.8 mmol/kg). Also, numbers of bacteria, fungi, and actinomycetes decreased with longer culture times. Combining OTC and Cu led to a higher inhibition of soil microbes than when either chemical was used alone. However, there was no significant relationship between single and combined toxic chemicals because of their complicated interactions, either antagonistic or synergistic. The results also indicated the sensitivity of bacteria, fungi, actinomycetes on toxic chemicals existed difference and that the AOA were more tolerant than the AOB to these chemicals.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 25
·11919-11927
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IF 3.3
Tao Chen,Yan-Tong Xu,Qing Guo,Xiaoli Chen,Qiucheng Su,Yan Cao
The analysis of trace Fe(III) ions in water is of vital importance in the fields of biology, environment and health. The fluorescent switch technique based on photoluminescent carbon dots (CDs) is highly favorable due to their bio-adaptability, safety and economy, but it is hindered in the highly specific recognition at the trace level. In this work, oxytetracycline-derived CDs (denoted as OCDs) with a uniform size (ca. 2.04 nm), nitrogen dopant, and rich hydroxyl-/carboxyl- groups have been successfully fabricated via a bottom-up hydrothermal carbonization approach. The as-prepared OCDs have displayed excellent photoluminescence characteristics and fluorescence switch performance for the rapid detection of Fe(III) within 2 min with the limit of detection (LOD) as low as 0.440 μM (24.6 ppb) and the second highest sensitivity of 3.52 × 10−2 μM−1 among reported CDs-based Fe(III) fluorescent switch materials. This detection system is stable in the analysis matrix with many interfering metal ions, at least with the help of the masking agent cysteine, realizing the specific detection of Fe(III) in real water environments. The contributions from the fluorophore concentration and the affinity between fluorophore and quencher have been revealed by the numerical model, providing a roadmap for the design of metal ion fluorescence switch materials based on a complex formation quenching mechanism. Fluorescence cell imaging in plant cells has also been performed successfully with the as-synthesized OCDs. This work presents a high-performing CDs-based Fe(III) fluorescence switch derived from the environmentally-risky oxytetracycline, as well as a feasible strategy for recycling waste antibiotics.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Lei Wang,Jafar Ali,Zhibin Wang,N.A. Oladoja,Rong Cheng,Changbo Zhang,Gilles Mailhot,Gang Pan
Nanobubbles have gained much attention due to their unusual properties such as large specific surface area, surface energy and internal energy, thereby, increase the surface reaction and improve the mass transfer efficiency. The long term stability of nanobubbles and generation of reactive oxygen species enables them to address various environmental issues for water purification without secondary pollution. However, there are few studies concerning the application of oxygen nanobubbles in the advanced oxidation processes (AOPs). In this study, first time, oxygen nanobubbles were introduced into the photoreaction system under visible light irradiation for enhanced photodegradation of oxytetracycline (OTC). Results indicated that oxygen nanobubbles significantly improved the photodegradation of OTC through high mass transfer and generation of reactive radicals during the nanobubble collapse. The oxygen nanobubble stability was confirmed to be pH dependent. The nanobubbles concentration increased from 0.76 to 3.78 × 10 8 particles/mL, while the mean size decreased from 205 nm to 138 nm as the pH value increased (3.2–11.0). The photodegradation efficiency of OTC was improved from 45% to 98% with the increase of pH (4.0–11.0). Oxygen nanobubbles hold promise to improve the AOPs , such as reducing catalysts and chemicals usage and costs. Quenching experiments demonstrated that OH was the predominant active species induced the photodegradation of OTC. With the development of nanobubbles technology, it is anticipated to realize totally chemicals free green technology. This study provides a novel nanobubble/AOPs technology, which will be more efficient and environmental friendly and will have broad application in waste water treatment and drinking water purification.
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