FOOD CHEMISTRY
·
2024
·
IF 8.5
Zhi Li,Shuangying Li,Liushan Jiang,Jingwen Niu,Yue Zhang,Linchun Nie,Qingxiang Zhou,Chunmao Chen
As a typical kind of new pollutants, there are still some challenges in the rapid detection of antibiotics. In this work, a sensitive fluorescent probe based on boron-doped carbon dots (B-CDs) in combination with thermo-responsive magnetic molecularly imprinted polymers (T-MMIPs) was constructed for the detection of oxytetracycline (OTC) in tea drinks. T-MMIPs were designed, fabricated and employed to enrich OTC at trace level from tea drinks, and B-CDs were utilized as the fluorescent probe to detect the concentration of OTC. The proposed method exhibited good linear relationship with OTC concentration from 0.2 to 60 μg L −1 and the limit of detection was 0.1 μg L −1 . The established method has been successfully validated with tea beverages. Present work was the first attempt application of T-MMIPs in combination with CDs in detection of OTC, and demonstrated that the proposed method endowed the detection of OTC with high selectivity, sensitivity, reliability and wide application prospect, meanwhile offered a new strategy for the method establishment of rapid and sensitive detection of trace antibiotics in food and other matrices.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Lidan Xie,Xinyi Lu,Wenyi Huang,Guoqiang Jiang,Yi Liu,Xiaoyun Fan
Piezoelectric polarized electric fields in non-centrally symmetric materials can enhance photocatalytic activity by inhibiting the recombination of photogenerated carriers. However, the catalytic performance of the unmodified piezo-photocatalyst is still not satisfactory, and it restricts its practical application in the field of piezo-photocatalysis. Herein, this study focuses on oxygen vacancies (OVs) and N doping to improve the catalytic activity of BCBF-OV2 piezo-photocatalyst. The effect of OVs and N doping on the efficient degradation of oxytetracycline (OTC) was explained through experimental research and characterization. The results indicate that the co-modified sample (BCBF-OV2) exhibited the highest OTC removal efficiency of 91.9 % after 30 min of reaction, with a kinetic constant 2.3 times higher than that of pristine BCBF. The potential mechanism for improving the piezo-photocatalytic activity of BCBF-OV2 has been revealed by PFM, KPFM and free radical quantification experiments. The presence of OVs and N doping leads to the generation of intermediate energy levels to reduce the energy barrier and promote the charge transfer between O 2 /H 2 O and BCBF-OV2 to enhance radical generation. Besides, BCBF-OV2 could also degrade a variety of pollutants and exhibit excellent catalytic properties. This study provides a deep understanding of the regulatory mechanism of N doping and OVs synergistically enhancing piezo-photocatalytic activity.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 33
·50177-50191
·
IF 5.19
Wang Meng-lu,Zhao Zhe,Lin Shumin,Su Ming,Liang Bolong,Liang Shu-xuan
The present study aimed to investigate the co-adsorption and application of water stabilized Fe 3 O 4 @ZIF-8 composite with magnetic cubic crystal structure. This new material was successfully prepared by facile modification strategy and rational design, which was used for simultaneous adsorption of oxytetracycline (OTC) and Pb(II) in aqueous solution. The co-adsorption behavior and mechanism of the composite for OTC and Pb(II) were systematically investigated by characterization techniques and batch experiments, and its application potential was effectively evaluated. The results showed that the synthesized Fe 3 O 4 @ZIF-8 composite innovatively retained the cubic crystal structure of ZIF-8 and was successfully loaded on the surface of Fe 3 O 4 particles with small particle size to form a core-shell structure. The Fe 3 O 4 @ZIF-8 composite possessed a large specific surface area (1722 m 2 /g), magnetic separation performance (13.4 emu/g), and rich functional groups. The co-adsorption of OTC and Pb(II) on Fe 3 O 4 @ZIF-8 had fast reaction kinetics (equilibrium within 90 min) and large adsorption capacity (310.29 mg/g and 276.06 mg/g respectively). The adsorption process for both contaminants followed pseudo-second order kinetics and Langmuir isotherm models and had synergistic and competitive effects at the same time. π-π stacking and electrostatic interaction were the main mechanisms of adsorption. Fe 3 O 4 @ZIF-8 had good adsorption performance after cyclic adsorption for 4 times and it performed well in the treatment of real waste water. This study provided a new sight for the control of combined pollution of OTC and Pb(II) and proved Fe 3 O 4 @ZIF-8 composites have great application potentials for complex wastewater treatment.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Tao He,Xuemei Pan,Wenguang Zhou,Huijun Ding,Mengting Liu,Mingxue Xiang,Qian Lou,Liu Han,Yan Zhang,Yixiao Wu,Yiling Chen
Pyrolytic reduction as an effective method is generally employed for synthesizing zero-valent iron @ biochar composite (ZVI@BC). However, it suffers from intractable obstacles, such as poor zero-valent iron (ZVI) dispersibility and low α-iron (α-Fe 0 ) content. Herein, we reported a possible way to target the dilemma for the first time, i.e., adding ammonium bicarbonate (NH 4 HCO 3 ) pretreatment step before pyrolytic reduction. In detail, the special NH 4 HCO 3 not only served as a precipitant to uniformly disperse ZVI over biochar by gradually releasing OH – , but also as a reductant to facilitate γ-Fe 0 transforming to α-Fe 0 in ZVI (∼71 %) via providing sufficient NH 3 . Besides, NH-ZVI@BC 3/1/5 exhibited outstanding oxytetracycline hydrochloride (OTC) removal ability (∼2869.1 mg/g), with the removal efficiency of 99.0 % at the dosage of 0.05 g/L. The removal mechanism was investigated which involved adsorption dominated by complexation, π-π electron donor acceptor interaction, hydrogen bonds, and electrostatic interactions. As well, OTC degradation was achieved by [H] and ·OH resulting from Fe-C micro-electrolysis and Fenton-like reaction during the corrosion of ZVI in ZVI@BC, respectively. In addition, four possible degradation pathways were proposed, and the contribution role in OTC removal followed the sequence: adsorption > degradation involved with [H] > degradation involved with ·OH. Moreover, N-ZVI@Biochar 3/1/5 exhibited easy separability, excellent reusability, and well practical applicability. Overall, this work not only opens a new avenue for the fabrication of ZVI@BC with high ZVI dispersibility and content of α-Fe 0 , but also shed light on the environmental remediation of antibiotics.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Yiying Yue,Jiamin Gu,Wanli Cheng,Guangping Han,Jingquan Han,Jianchun Jiang
A portable, sensitive, rapid, specific, and environment-friendly polyvinyl alcohol–borax (PB) hydrogel fluorescence probe was synthesized for the sequential sensing of Cu 2+ and oxytetracycline (OTC) in wastewater. The aminated 2,2,6,6-tetramethylpiperidinooxy-oxidized cellulose nanofibers/europium complexes/carbon dot (ATOCN/Eu(DPA) 3 /CD) complex was added to the PB matrix. With the assistance of ATOCNs, the in-situ polymerized ATOCN/Eu(DPA) 3 /CD complexes were well-dispersed in the hydrogel and enhanced the mechanical properties of the hydrogel. The prepared hydrogel could be converted from solid to liquid by adjusting the water content to reduce the deviations caused by the solid probe detection. The probe not only induced evident fluorescence quenching and instantaneous response to Cu 2+ at 430 nm and OTC at 617 nm but also exhibited a high selectivity to Cu 2+ and OTC. The detection limits for Cu 2+ and OTC were 0.031 and 0.019 mg L −1 , respectively. Fluorescence recover was achieved by adding S 2− for CuS precipitate formation and for the thermal decomposition of OTC. After repeatedly recovering the fluorescence for 10 times, the fluorescence intensity at 430 nm was restored to 79% of the original intensity and that at 617 nm was stored to 95%. The results show that hydrogels have remarkable potential applicability in detecting Cu 2+ and OTC in wastewater.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·
IF 0
Zhang Zekun,Zhao Le,Yang Jie,Pang Jiayin,Lambers Hans,He Honghua
Antibiotic contamination in soil has become a major concern worldwide. At present, it is not clear how two co-existed antibiotics with environmentally relevant concentrations would affect soil bacterial community structure, the abundances of antibiotic resistance genes (ARGs) and functional genes, and whether the effects of antibiotics would differ between rhizosphere and bulk soil. We conducted a greenhouse pot experiment to grow maize in a loess soil treated with oxytetracycline (OTC) or sulfadiazine (SDZ) or both at an environmentally relevant concentration (1 mg kg −1 ) to investigate the effects of OTC and SDZ on the rhizosphere and bulk soil bacterial communities, abundances of ARGs and carbon (C)-, nitrogen (N)-, and phosphorus (P)-cycling functional genes, and on plant growth and plant N and P nutrition. The results show that the effects of environmentally relevant concentrations of OTC and SDZ on bacterial communities and abundances of ARGs and functional genes differ between maize rhizosphere and bulk soil. The effects of two antibiotics resulted in a higher absolute abundances of accA , tet(34) , tnpA-04 , and sul2 in the rhizosphere soil than in the bulk soil and different bacterial community compositions and biomarkers in the rhizosphere soil and the bulk soil. However, OTC had a stronger inhibitory effect on the abundances of a few functional genes in the bulk soil than SDZ did, and their combination had no synergistic effect on plant growth, ARGs, and functional genes. The role of co-existed OTC and SDZ decreased shoot height and increased root N concentration. The results demonstrate that environmentally relevant concentrations of antibiotics shift soil microbial community structure, increase the abundances of ARGs, and reduce the abundances of functional genes. Furthermore, soil contamination with antibiotics can diminish agricultural production via phytotoxic effects on crops, and combined effects of antibiotics on plant growth and nutrient uptake should be considered.
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MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 7
·2365-2373
·
IF 4.58
He Jincan,Li Gongke,Hu Yuling
The authors describe a fluorescence amplification strategy for selective and sensitive fluorescent assays based on aptamer-triggered directional hydrolysis and on the use of metal organic frameworks (MOFs) of type MIL-101. The method is implemented by mixing MIL-101, fluorescein-labeled DNA probes, exonuclease of type RecJf, and targets. A smart design of the three-adenine bulge on the DNA probe facilitates exonuclease-assisted directional hydrolysis, making the strategy universal for determination of both proteins and small molecules as well. Good selectivity is accomplished due to the use of MIL-101 protected aptamers, while high sensitivity resulted from exonuclease-assisted target-recycling signal amplification. The power of the method is demonstrated by analyzing the two model analytes thrombin (a fairly large protein) and oxytetracycline (OTC; a small molecule antibiotic). The limits of detection are 15 pM for thrombin and 4.2 nM for OTC. This is two orders of magnitude lower than that of conventional 1:1 homogeneous fluorescence assays. The strategy was successfully applied to the analysis of thrombin and OTC in real samples. In our perception, the strategy presented here has a wide scope for selective and sensitive detection of trace analytes for which appropriate DNA probes can be identified.
Schematic of an aptamer-triggered amplification strategy for sensitive bioassays based on fluorescence quenching of a MOF and 5′→3′ directional hydrolysis of RecJf exonuclease. The adenine-bulge on the DNA probe facilitates exonuclease hydrolysis, making the strategy universal for both proteins and small molecules detection.
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Advanced Science
·
2024
·
IF 14.3
Liyun Ma,Zhi Li,Yiyi Shi,Yuchen Xie,Ming Jiang,Xu Yu,Li Xu
The monitoring and removal of environmental pollutants are vital for the sustainable development of society. Herein, a novel nanocomposite combining silicon nanoparticles and carbon-doped titania, C-TiO 2 /SiNPs, is designed as a fluorescence probe and visible-light photocatalyst to simultaneously monitor and degrade oxytetracycline (OTC). C-TiO 2 /SiNPs emit blue fluorescence, which can be quenched by OTC through inner filter effect. Meanwhile, green fluorescence is turned on upon OTC addition by aggregation-induced emission. Thus, C-TiO 2 /SiNPs successfully act as a fluorescence colorimetric probe for quantitation and semi-quantitation of OTC. Additionally, C-TiO 2 /SiNPs show adorable visible-light photocatalytic activity toward OTC, achieving a removal rate of 93.3% in 30 min. This process is driven by the superoxide radicals, holes and hydroxyl radicals produced by C-TiO 2 /SiNPs under visible light irradiation. The total toxicities obviously reduce after OTC is degraded by C-TiO 2 /SiNPs. The concentration during the OTC degradation can be estimated by naked eyes through the change of fluorescence color, but also precisely quantified by a fluorometer. This study innovatively develops a one-stone-two-birds strategy to achieve simultaneous degradation and in situ real-time detection of OTC, paving a promising paradigm for the highly efficient monitoring and removal of residual drugs.
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高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Xiaohui Wang,Yichuan Cao,Xuelian Hu,Lin Cai,Haiyang Wang,Guozhen Fang,Shuo Wang
Since oxytetracycline (OTC) residues in foodstuff are very harmful to human health, it is urgent to develop an effective assay to monitor OTC. Herein, an innovative fluorescent biomimetic sensor (Ce, N-CDs@ZIF-67@MIP) based on cerium, nitrogen co-doped carbon quantum dots (Ce, N-CDs) embedded in cobalt-based metal organic framework (ZIF-67) combining with molecularly imprinted polymer (MIP) was triumphantly fabricated by a simple one-pot strategy and subsequently applied for the selective and sensitive detection of OTC. In this strategy, the modification of the surface imprint layer enabled the sensor to possess favorable anti-interference ability and specific recognition performance for OTC. The introduction of ZIF-67 with large specific surface area functioning as supporter significantly increased the mass transfer rate and shortened the response time, which improved the adsorption performance and detection sensitivity of Ce, N-CDs@ZIF-67@MIP. Meanwhile, the Ce, N-CDs featured with bright blue fluorescence (FL) and high fluorescence quantum yield (FLQY, 33.69%) were incorporated as a signal label to make the sensor generate measurable FL response signal according to the inner filter effect (IFE), achieving signal amplification. Thanks to the integrated merits of MIP, ZIF-67 and Ce, N-CDs, the constructed Ce, N-CDs@ZIF-67@MIP sensor not only displayed a favorable linear range (0.05–20 μg mL −1 ) with a low detection limit (0.015 μg mL −1 ), but also showed good precision and reproducibility (RSD). More importantly, the designed sensor was successfully used to quantitatively analyze OTC in milk samples, and the corresponding results were in accordance with those obtained by HPLC method. Therefore, the proposed Ce, N-CDs@ZIF-67@MIP sensor is expected to provide an efficient and sensitive FL detection platform for OTC evaluation in dairy products.
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高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Huang-gen Yang,Mang Lu,Xue-jiao Wu,Rui-ting Dong,Tao-peng Luo,Hui-hua Zhong
Persulfate non-radical oxidation have excellent catalytic capability for degrading specific contaminants in complicated water environments. Nevertheless, the preparation of high-performance activators and their application in actual water treatment in continuous flow mode are still scarce and unsatisfactory. In this work, copper-, manganese-, and copper/manganese-doped ceramsites (Cu–C, Mn–C and Cu/Mn–C), successfully fabricated through a facile impregnation-calcination approach, were characterized and evaluated for their performance to activate potassium peroxydisulfate (PDS) and degrade oxytetracycline (OTC) under different pH, ceramsite dosages, and PDS dosages. Compared with Cu–C and Mn–C, Cu/Mn–C showed the highest OTC degradation rate (0.0264 min −1 ) via activating PDS with an OTC removal efficiency of 98.2% in 240 min at an initial OTC concentration of 40 mg/L. The removal efficiency of OTC by Cu/Mn–C only decreased to 92.8% after 5 cycles; the activating ability of the used Cu/Mn–C was almost completely recovered through 2 h of calcination at 500 °C. The results of electron paramagnetic resonance and radical quenching suggest that singlet oxygen ( 1 O 2 ) was unveiled to be the dominant reactive oxygen species (ROS) for contaminant degradation, originating from the regrouping of superoxide ions or reduction of active Cu/Mn sites. Synergies between Cu and Mn species to enhance ROS yield were the primary activating mechanisms. Six possible routes of OTC decomposition were inferred. Additionally, Cu/Mn–C behaved excellently in treating an actual wastewater using a continuous flow fixed-bed reactor. It is believed that this novel Cu/Mn–C/PDS system may create a fresh path to design effective and cheap metal-ceramsite hybrid activators for degrading recalcitrant contaminants in the actual application process.
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