ENVIRONMENTAL POLLUTION
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2024
·
IF 7.6
Yaoyu Zhou,Jianlong Wang
Electro-Fenton (EF) can in-situ produce H 2 O 2 and effectively activate H 2 O 2 to generate powerful reactive species for the destruction of contaminants under acidic conditions, however, the production of iron-containing sludge and requirement of low working pH significantly hinder its practical application. Herein, a novel Cu, N co-doped carbon (Cu–N@C) with metal organic framework (MOF) as a precursor was constructed and adopted for the elimination of pefloxacin (PEF) in the heterogeneous electro-Fenton (HEF) process. PEF could be almost completely removed within 1 h and total organic carbon (TOC) removal efficiency was 48.57% within 6 h. Meanwhile, Cu–N@C had good repeatability and environmental adaptability, it can still maintain excellent catalytic performance after 10 cycles, and it exhibited satisfactory remediation performance in simulated water matrix. In addition, the HEF process catalyzed by Cu–N@C also showed satisfactory degradation effect on other organic pollutants including atrazine, methylene blue, and chlorotetracycline. Under the action of impressed current, the HEF system could generate H 2 O 2 in-situ, and the active species could be generated in the redox cycle of Cu 0 /Cu 1+ /Cu 2+ . Electron paramagnetic resonance and quenching experiments confirmed that •OH was the dominant active species in the degradation of organic compounds. The degradation process of PEF was studied by mass spectrometry analysis of intermediate products. This study provided a simple method to prepare MOF-based electrocatalyst , which exhibits promising application potential for treatment wastewater .
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Huijing Ma,Bing Yu,Qingping Wang,Gary Owens,Zuliang Chen
While Fe-based metal-organic frameworks (MOFs) can be used to remove antibiotics by adsorption, knowledge of how antibiotics are degraded by MOFs is still limited. In this study, one Fe-based MOF, NH 2 -MIL-88B was used to remove pefloxacin from aqueous solution via a combination of adsorption and Fenton-like oxidation. NH 2 -MIL-88B exhibited a high adsorption capacity for pefloxacin (41.37 mg·g −1 ), with >99% removal efficiency within 120 min based on Fenton-like oxidation. To better understand the mechanisms involved in integrated adsorption and Fenton-like oxidation, various advanced characterization techniques were used to monitor the changes in morphology and composition of NH 2- MIL-88B before and after removal of pefloxacin. Scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDS), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) all supported adsorption and Fenton oxidation of pefloxacin. In addition, the pefloxacin degradation products identified by LC-UV and LC-MS provided information on the potential adsorption-Fenton oxidation mechanism. These results suggested that NH 2 -MIL-88B has remarkably potential to be used in an integrated adsorption and Fenton-like process for the removal of antibiotics from aqueous solution.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 28
·43201-43211
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IF 5.19
Huang Hongli,Zheng Yongxin,Wei Dongning,Yang Guang,Peng Xin,Fan Lingjia,Luo Lin,Zhou Yaoyu
In this paper, one kind of acid–alkali modified sludge-based biochar (ASBC) was synthesized, characterized, and employed as adsorbent for the removal of pefloxacin. The characterization results showed that the specific surface area (SSA) of ASBC (53.381 m 2 /g) was significantly higher than that of SBC (24.411 m 2 /g). ASBC had a rougher surface, larger particle distribution, lower zero point charge, and richer functional groups (e.g., C-O and O–H) than SBC. The adsorption capacity of ASBC was 1.82 times than that of SBC. After 8 adsorption cycles in reuse experiment, the adsorption capacity of ASBC for pefloxacin still reached 144.08 mg/L, indicating that ASBC has good reusability. Static experiments showed that the optimal pH value was 6.0 in the adsorption of pefloxacin on SBC and ASBC. The result of adsorption kinetics indicated that the pseudo-second-order model could describe well the adsorption process. The Freundlich model was better than the Langmuir model to describe the adsorption of pefloxacin by ASBC, indicating that the adsorption process was mainly multilayer adsorption. Thermodynamic result showed that the adsorption of pefloxacin by ASBC was spontaneous and endothermic. The removal mechanism of pefloxacin by ASBC is mainly the substitution reaction and π-π EDA interaction. In summary, acid–alkali modified biochar is an effective adsorbent for pefloxacin in aqueous solution, and has great application prospects. Graphical abstract
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Qihong Cai,Menglin Wang,Zhima Yangcuo,Xiaodan Zheng,Xinyi Zheng,Yaning Qin,Zhexiang Zou,Shiqi Zhang,Zhonghui Chen,Zhangxu Chen
In this study, a new first derivative synchronous fluorescence spectrometry (SFS) for the accurate and sensitive determination of pefloxacin (PFX) and fleroxacin (FLX) in wastewater was established. PFX and FLX were complexed with Al 3+ to significantly enhance their fluorescence intensity. Because the conventional fluorescence spectra of PFX-Al 3+ and FLX-Al 3+ overlap significantly, the wavelength difference (Δλ = 155 nm) was chosen for SFS scanning to narrow spectral band. And the narrowed synchronous fluorescence spectra was subjected to first derivative processing. Finally, the zero intersections of the first derivative synchronous fluorescence spectra at 281.6 nm and 273.6 nm were chosen for the determination of PFX and FLX, cleverly used of spectral parameters to eliminate the serious interference between PFX-Al 3+ and FLX-Al 3+ and the interference of wastewater background. The limits of detection of PFX and FLX were 0.0086 ng·mL −1 and 0.0068 ng·mL −1 with linear ranges from 0.1–40 ng·mL −1 and 0.2–80 ng·mL −1 , respectively. Recoveries of PFX and FLX in wastewater were 88.60 %–98.60 % and 90.00 %–95.60 %. The first derivative SFS established in this study used spectral separation instead of chromatographic separation, so that sample pretreatment was simple and the detection speed was fast. Compared the conventional method of HPLC, the test results of above two methods were close. And the new method had been successfully used for the determination of PFX and FLX residues in wastewater with good results. Therefore, the new first derivative SFS was expected to become a routine detection technology for PFX and FLX residues in wastewater and widely used.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Qi Liang,Donglan Zhou,Kai Zhang,María B. Camarada,Jianhua Xiong,Xiaoning Liao
Developing a reliable detection method with high performance for pefloxacin (PFL) is crucial for environmental protection and food safety. However, this remains a challenge. In this study, a new portable electrochemical sensor with a smartphone readout system based on a modified Cu-MOF was designed for PFL detection. The modified Cu-MOF was prepared using a two-step post-synthetic modification strategy. Firstly, thiourea (Th) was doped into the Cu-MOF framework using a solvothermal method, and then the Th-Cu-MOF was further functionalized with MWCNTs using a self-assembly method. X-ray photoelectron spectroscopy combining with chronocoulometry technique and electrochemical impedance measurements revealed that Th not only increased the Cu-MOF’s affinity to PFL but also acted as a bridge, enhancing the interaction between Cu-MOF and MWCNTs. This led to a MOF-based nanocomposite with significantly improved conductivity and specific catalytic properties for PFL. After optimizing detection conditions, the portable sensor showed wide linearity range (9 nM–2.5 μM), excellent selectivity, good stability and a low detection limit (2.6 nM) surpassed that of HPLC in the detection of PEL by utilizing square wave voltammetry technique. In real sample analysis of pond water, shrimp flesh and pork, the portable sensor showed good recoveries (87.92 %–104.4 %), which were comparable to those of HPLC and an electrochemical sensor with a classical three-electrode configuration. This demonstrates that the sensor holds excellent potential for on-site monitoring of PFL in aquaculture.
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JOURNAL OF MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Ruizhen Li,Yu Hu,Lijun Du,Jiawen Li,Jigang Yuan,Xingyong Liu
In recent years, advanced oxidation processes (AOP) based on sulfate free radicals (SO 4 − ·) have attracted considerable attention due to the excellent advantages of SO 4 − · compared with hydroxyl radical (·OH). However, SO 4 − · generally produced by activating extra persulphates, which causes high cost and risk of secondary pollution. In this work, BiPO 4 modified carbon paper electrode (BiPO 4 /CP) successfully fabricated via simple method can be used as a photocatalyst to effectively activate sulfate originally existed in wastewater to generated sulfate radicals in-situ without adding any extrinsic chemical oxidants. Pefloxacin (PFX) was degraded effectively on BiPO 4 /CP with the help of applied potential. CP with large surface area and high electrical conductivity as an excellent support for BiPO 4 is beneficial to improve the reutilization, electron transfer and photocatalytic performance of BiPO 4 . Moreover, BiPO 4 with large bandgap has sufficient redox capacity to produce not only ·OH, superoxide radical (·O 2 − ), but also SO 4 − ·, which is crucial for photocatalytic pollutant degradation. Detailed characterizations give strong evidences of the successful fabrication of photocatalyst, thermodynamic feasibility of SO 4 − · in-situ formation, the generation of free radicals, and the possible mechanism. Consequently, under the optimal conditions (pH=5.6, +1.0 V (vs.SCE), [SO 4 2− ]=10 mM, 61 μW cm −2 UV light irradiation, 33 mg BiPO 4 loaded on CP), the degradation efficiency of PFX (10 mg/L) was 87.8% in 120 min, which was 5.1 ad 8.2 times higher than that in photocatalytic and electrocatalytic system and 3.3 times higher than that without SO 4 2− . Meanwhile, BiPO 4 /CP maintains high level of degradation efficiency of PFX after 6 cycles under the optimal conditions.
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MICROCHIMICA ACTA
·
2014
·Vol. 182
·期 1
·297-306
·
IF 3.719
Liang Wanjun,Liu Zhengqing,Li Dan,Wu Xiaoping,Liu Shaopu,He Youqiu
We describe a novel fluorescent bioprobe for the sensitive and selective detection of double-stranded DNA (dsDNA). It consists of quantum dots (Q-dots) whose fluorescence is quenched (through photoinduced electron transfer) on covering them with the Al(III)-pefloxacin complex. It is found, however, that dsDNA has an affinity for this complex that is so strong that it can break up the binding to the quantum dots, this leading to a complete recovery of the fluorescence of both the Q-dots and the Al(III)-pefloxacin complex. Dual fluorescence (peaking at 420 and 547 nm) is observed under a single excitation wavelength of 350 nm. Neither ribonucleic acid, bovine serum albumin, nor biologically relevant metal ions are capable of giving this effect. The detection limit (3σ/k) for herring sperm DNA is 15.3 μg L −1 if determined via the fluorescence of the Q-dots, and 48 μg L −1 via the Al(III)-pefloxacin complex. The method was applied to the determination of hsDNA in synthetic samples and gave excellent results.
Al 3+ -pefloxacin mesylate (QDs-Al 3+ -PFLX) complex acts as an excellent quencher of the fluorescence of QDs, which was attributed to the photoinduced electron transfer from QDs to Al 3+ -PFLX complex. Due to the strong and specific binding of double-stranded DNA with Al 3+ -PFLX complex, the fluorescence intensity of QDs-Al 3+ -PFLX dyads system is restored
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Guangli Li,Xiaoman Qi,Jingtao Wu,Xuan Wan,Tianyu Wang,Ying Liu,Yuwei Chen,Yonghui Xia
The overuse of pefloxacin (PEF) leaves residues in foods. Therefore, the development of robust analytical techniques for the selective detection of PEF is of great importance. In this study, a highly stable electrochemical sensing platform has been constructed, using molecularly imprinted polymer (MIP)-coated gold nanoparticle/black phosphorus nanocomposites (BPNS-AuNPs), for the selective detection of PEF. BPNS-AuNPs significantly enhance the black phosphorus (BP) stability and electrochemical activity and offer a larger surface area to accommodate more imprinted sites for selective PEF binding. MIP/BPNS-AuNPs exhibit a broad linear detection range (0.005–10 μM), low detection limit (0.80 nM), and high sensitivity (3.199 μA μM −1 ). The MIP/BPNS-AuNPs show a high binding affinity for PEF, even in the presence of structural analogs, and maintain stable voltammetric signals for at least 35 d. The MIP sensor exhibits consistent high sensitivity in the detection of PEF in real milk and orange juice samples.
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FOOD CHEMISTRY
·
2025
·
IF 9.8
Minghui Li,Daqi Chen,Yuhuai Guo,Tianxu Li,Wenjie Guo,Rui Feng,Dien Shao,Ziqi Jiang,Ye Li,Jie Zan
Residual quinolone antibiotics (lomefloxacin [LOM], ofloxacin [OFL], pefloxacin [PEF]) in food matrices present significant public health risks due to bioaccumulation and toxicity, necessitating field-deployable methods with superior sensitivity over conventional laboratory techniques. We developed a dual-mode lateral flow immunoassay (LFIA) integrating antibody-conjugated Au@4-ATP@AgNPs nanoprobes with machine learning (ML)-enhanced multi-peak surface-enhanced Raman scattering (SERS) analysis (1071, 1142, 1392, 1442, 1576 cm -1 ) for simultaneous quantification in milk. Results showed the dual-mode SERS-LFIA platform achieved limits of detection (LODs) of 2.94 pg/mL (LOM), 264 pg/mL (OFL), and 1.05 ng/mL (PEF)-representing 330-, 946-, and 476-fold improvements over conventional colorimetric LFIA (CM-LFIA), respectively, with recovery rates of 83.2-118.1% and reproducibility (CV < 13%) in complex milk matrices. ML-based multi-peak analysis reduced quantification error from 21-fold to 13-fold overestimation, compared to single-peak calibration. Overall, this ML-integrated SERS-LFIA delivers unprecedented sensitivity, accuracy, and field-deployability for quinolone residue monitoring in dairy products.
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