SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Beibei Mao,Fei Qu,Shuyun Zhu,Jinmao You
Herein, utilizing fluorescent Ag nanoclusters (Ag NCs) capped by polyethyleneimine (PEI) with different molecular weights, we constructed a novel Ag NCs-Cu 2+ sensing system based on fluorescence turn-on strategy for trace detection of quinolones, including nalidixic acid, cinoxacin, ciprofloxacin/ofloxacin, and moxifloxacin; these were the representatives of four generations of quinolone antibacterial drugs. The fluorescence of Ag NCs could be efficiently quenched by Cu 2+ , while with the addition of quinolones, the fluorescence of this system recovered rapidly. This protocol exhibited excellent sensitivities to these five quinolones. For instance, the linear ranges were from 1 to 100 nM for nalidixic acid with limit of detection (LOD) 0.47 nM, from 1 to 80 nM for cinoxacin with LOD 0.43 nM, from 0.1 to 120 nM for ciprofloxacin with LOD 38 pM, from 0.1 to 80 nM for ofloxacin with LOD 49 pM, and from 0.1 to 120 nM for moxifloxacin with LOD 48 pM, respectively, revealing that this approach showed low detection limits and wide linear ranges. Benefiting from the high sensitivity, the satisfactory recoveries were obtained for trace detection of quinolones in real samples, such as tablets, human urine and serum.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Xiuying Liu,Lihong Su,Lijie Zhu,Xue Gao,Yuxin Wang,Fengling Bai,Yiwei Tang,Jianrong Li
In this study, aptamer-functionalized magnetic Fe 3 O 4 conjugated with upconversion nanoparticles (UCNPs) were used as hybridization nanoprobes to quantify trace enrofloxacin (ENR) in food samples. Owing to the autofluorescence-free nature of UCNPs, an ENR-responsive aptamer, and the use of magnetic separation to further reduce background signals, our sensing system enabled rapid and highly sensitive detection of trace ENR in real samples. The proposed sensing method was validated in terms of selectivity, linearity, accuracy, precision, and sensitivity; and then was applied to the analysis of four different fish samples. Recoveries between 85.1% and 98.5%, and relative standard deviation (RSD) values in the range of 2.4% to 5.0% and from 3.0% to 4.3%, for intra- and inter-day tests, respectively, were obtained, with the limits of detection and quantification of 0.06 and 0.20 ng/mL, respectively. Therefore, the good validation and application results that we obtained indicate that the sensing method is suitable for the quantification of target ENRs in real samples, and show great potential for wide-ranging application in bioassays by simply changing the type of aptamer.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Xiaohui Wu,Mingjie Huang,Tao Zhou,Juan Mao
A novel magnetic molecular imprinting composites (MICs) were successfully synthesized through cross-linked chitosan and γ-Fe 2 O 3 particles, and the selective removal of aqueous NOR was demonstrated. The γ-Fe 2 O 3 particles embedded in MICs were still of intrinsic crystal and complexed with both amino and hydroxyl groups of chitosan. Adsorption behavior of NOR onto MICs could be described by the pseudo-second-order kinetic and the Langmuir isotherm model. Excellent selective NOR adsorption was identified with competition of sulfadiazine (SD), ofloxacin (OFL) and phenol, respectively. It could be ascribed to the memory cavities for NOR molecules, as well as the formation of triple intermolecular hydrogen bonds with suitable angle and length. Furthermore, application feasibility of MICs in NOR-spiked municipal wastewater treatment plant (WWTP) effluent was investigated. Competing with the effluent organic matters (EfOM), effective adsorption performance of NOR could be still obtained. Effect of humic and fulvic acid-like organics could be effectively reduced, while adsorption of tryptophan-like substances was slightly enhanced. In addition, it was found that Fenton-like oxidation instead of NaOH washing would be more appropriate for the multiple regenerations of MICs. The former would reserve more memory cavities and lead to oxidative decomposition of the desorbed NOR into micromolecular organics of low environmental impacts.
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2017
·Vol. 409
·期 28
·6643-6653
·
IF 3.431
Wang Nan,Wang Yan-Fei,Omer Ahmed M.,Ouyang Xiao-kun
A novel adsorbent based on the surface of magnetic graphene oxide-grafted cellulose nanocrystal molecularly imprinted polymers (Mag@GO-g-CNCs@MIPs) was developed for the selective extraction and fast adsorption of fluoroquinolones (FQs) from river water samples. Cellulose nanocrystals (CNCs) were grafted onto activated graphene oxide (GO), and the surfaces of the obtained magnetic GO-g-CNC particles were molecularly imprinted with polymers using ofloxacin (OFX) as a template molecule and methacrylic acid (MAA) as a functional monomer. The resulting Mag@GO-g-CNCs@MIP material was characterized by Fourier transform infrared spectroscopy, transmission electron microscopy, scanning electron microscopy, vibrating sample magnetometry, and X-ray photoelectron spectroscopy. Under optimum adsorption conditions, the Mag@GO-g-CNCs@MIPs with large specific surface area were easily collected and separated using an external magnetic field. Mag@GO-g-CNCs@MIPs exhibited an ultra-fast adsorption profile for FQs (5 min to achieve the maximum adsorption capacity of 74 mg/g), with imprinting factor values ranging from 1.5 to 3.1. High recognition selectivity towards nine FQs from real river water samples was established through coupling with high-performance liquid chromatography (HPLC), and the recovery of samples spiked with nine FQs was found to be in the range of 79.2–96.1%, with a detection limit ranging from 6.5 to 51 ng/g. Moreover, the data obtained adhered to the Freundlich isotherm model, and the adsorption kinetics followed a pseudo-second-order model. Finally, the Mag@GO-g-CNCs@MIPs could be regenerated and reused for seven consecutive cycles with only a 13% drop in adsorption capacity, indicating its effective application as a new, reusable, and selective adsorbent for the enrichment and separation of FQs from aqueous solutions.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Yan-Fei Wang,Yang-Guang Wang,Xiao-Kun Ouyang,Li-Ye Yang
We herein describe a novel adsorbent based on molecularly imprinted polymers (MIPs) on the surface of magnetic carboxylated cellulose nanocrystals (Fe3O4@CCNs@MIPs) for the separation and purification of six fluoroquinolones (FQs) from egg samples. The obtained Fe3O4@CCNs@MIPs not only exhibited a large surface area and specific recognition toward FQs, but also were easily gathered and separated from the egg samples using an external magnetic field. The morphologies and surface groups of the Fe3O4@CCNs@MIPs were assessed by X-ray photoelectron spectroscopy, transmission electron microscopy, vibrating sample magnetometry, X-ray diffraction, thermogravimetric analysis, Fourier transform infrared spectroscopy, and Brunauer–Emmett–Teller surface area analysis. The Fe3O4@CCNs@MIPs exhibited high selectivity toward six structurally similar FQs. An enrichment approach was established for the measurement of six FQs from egg samples using Fe3O4@CCNs@MIPs coupled to high-performance liquid chromatography. The recovery of spiked FQs ranged from 75.2–104.9% and limit of detection was in the range of 3.6–18.4 ng g–1 for the six FQs. Therefore, the proposed method is a promising technique for the enrichment, separation, and determination of FQs from biomatrices.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Yanling Liu,Yuying Chen,Xiaping Zhu,Ping Zhao,Wei Ren
The magnetic solid phase extraction material (MnFe 2 O 4 @TiO 2 ) was prepared by coating TiO 2 on MnFe 2 O 4 through an in-situ formation method. The structure and properties of MnFe 2 O 4 @TiO 2 were characterized by X-ray diffractometer (XRD), scanning electron microscope (SEM), nitrogen adsorption–desorption experiment, and vibrating sample magnetometer (VSM). The conditions for magnetic solid phase extraction (MSPE) of quinolone antibiotics were optimized, and an MSPE-HPLC method was established to determine quinolone antibiotics in water samples. The optimal conditions for MSPE are MnFe 2 O 4 @TiO 2 amount of 15 mg, extraction time of 15 min, 5 mL of methanol solution with 20 % ammonia as eluent, and elution time of 1 min. Under the optimal conditions, 50 mL 0.1 mg/L mixed standard solutions of fleroxacin, ofloxacin, norfloxacin, ciprofloxacin, and enrofloxacin have achieved enrichment multiples of 67.8, 72.1, 59.6, 55.8, and 60.7, respectively. The linear range of five antibiotics determined by MSPE-HPLC is 0.004–1 mg/L with the relative standard deviations (RSDs) of 2.1 %–4.9 % and the limits of detection (LODs) of 0.0006–0.0020 mg/L. The method is applied to the determination of the five antibiotics in rice paddy water and fish pond water; the recoveries range from 78.9 to 105.8 %, and the RSDs (n = 5) are 3.6 %–8.7 %.
✓ 已验证
产品关联
DOI
高影响因子
POLYHEDRON
·
2024
·
IF 2.4
Muhammad Jamshaid,Adeel Ahmed,Rashid Iqbal,Ali Fareed,Wedad A. Al-onazi,Mohamed S. Elshikh
The current study focuses on the development of highly efficient nickel oxide/titanium dioxide (NiO/TiO 2 ) p-n heterojunction catalysts constructed via sol–gel and ultrasonic techniques. Different techniques, including XRD, SEM, EDS mapping, and XPS, confirmed the successful synthesis of the photocatalysts. The BET analysis showed that the NiO/TiO 2 heterojunction has a surface area of 107.52 m 2 /g compared to pure NiO and TiO 2 (75.37 m 2 /g and 89.13 m 2 /g) respectively. The catalyst was then implemented to decompose the antibiotic tetracycline (TC) in water under visible light. The outcomes revealed that the degradation rate of TC reached 97.69 % using NiO/TiO 2 , which is substantially greater than the degradation achieved with pure NiO (52.43 %) and TiO 2 (71.11 %) within a 48-minute period pursuant to the most favorable circumstances. The initial rate constant of the NiO/TiO 2 (0.0756 min −1 ) was significantly higher compared to that of the NiO (0.0153 min −1 ) and TiO 2 (0.0261 min −1 ). The lower bandgap energy of the NiO/TiO 2 (3.19 eV) catalyst compared to the pure NiO (3.58 eV) and TiO 2 (3.29 eV) facilitated the abatement of TC due to the improved harvesting of visible light absorption. Furthermore, the study investigated the impact of several different reaction parameters and intervening anions on TC degradation. Radical trapping investigations substantiate the existence of reactive oxygen species. In addition, NiO/TiO 2 catalyst exhibited extraordinary stability and maintained its catalytic efficiency despite enduring five successive cycles. Overall, the NiO/TiO 2 catalyst demonstrated remarkable potential for abolishing TC-contaminated water.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Mengqing Hu,Di Zhao,Xinlong Yan,Yun Wang,Jin Zhang,Xiaoyan Hu,Ming Zhou,Porun Liu
Designing advanced bimetallic catalysts is essential to improving peroxymonosulfate (PMS) activation. Herein, a novel magnetic nickel/cobalt-layered double hydroxide decorated nitrogen-doped carbon (Ni/Co LDH@NC) catalyst we synthesized using carbonized ZIF-67 as a template for simultaneous removal of sulfamethoxazole (SMX) and Pb(Ⅱ) by PMS activation. The synthesized Ni/Co LDH@NC achieved complete degradation of SMX within 20 min and adsorbed Pb(Ⅱ) at 90.3 mg g −1 in 2 h. Notably, in simulated mixed wastewater, Ni/Co LDH@NC removed 100 % of SMX and simultaneously absorbed 84 % of Pb(Ⅱ) within 60 min. Density functional theory (DFT) studies revealed that synergistic Ni-Co sites and “bridging oxygen” vacancies enhanced electron transfer to PMS, facilitating O-O bond cleavage. The catalyst maintained high performance after four cycles, with over 85 % SMX degradation and 80 % Pb(Ⅱ) removal. This study highlights the potential of MOF-derived catalysts for efficient, simultaneous remediation of antibiotic and heavy metal pollutants, contributing to advanced wastewater treatment.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 8
·083508
·
IF 3.1
Xuan Dinh Ngo,Ngoc Huyen Nguyen,Thi Lan Huong Phung,Tuan Anh Nguyen,Nguyen Thanh Vinh,Quy Nguyen Van,Vinh Hoang Tran,Nhung Pham Tuyet,Anh-Tuan Le
In this study, we describe experimental efforts to decipher the role of ZnCo2O4 nanoflakes (ZCO-NFs) for selective enhancement of voltammetric responses of screen-printed electrode (SPE) toward redox species system. The ZCO-NFs sample was characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and UV–vis spectroscopy. The electrochemical characterization of bare SPE and modified SPE electrodes was investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and Mott−Schottky analysis. A series of redox systems including paracetamol (PA), dopamine (DA), chloramphenicol (CAP), furazolidone (FZD), p-nitrophenol (p-NP), carbaryl (CBR), ofloxacin (OXF), and erythromycin (ERY) were selected to investigate for (i) reversible redox process, (ii) irreversible electrochemical oxidation process, and (iii) irreversible electrochemical reduction process on both bare-SPE and ZCO-NFs/SPE electrodes. The obtained results showed that ZCO-NFs possess the selective enhancement of electrochemical response for redox systems with an increase of 24%–90% for PAR, DA, FZD, CAP, and CBR and a decrease of 13%–49% for p-NP, ERY, and OFX. The different electrochemical response of redox species at nanostructured semiconductor electrodes is attributed to the contribution of both the adsorption capacity of redox species and the interfacial electron transfer process between electrode and redox species. An insight into the interfacial electron transfer kinetics and its contribution to the enhancement of electrochemical response on p-type semiconductor electrode is helpful in designing high-performance sensing platforms based on spinel oxide nanostructures.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Guangli Li,Xuan Wan,Qian Zheng,Mengyu Yang,Yonghui Xia,Xiaoman Qi,Tianyu Wang,Zhi Wu
The overuse of gatifloxacin seriously pollutes the environment and cause potential harm to our health. Hence, it is imperative to develop a rapid and sensitive method for gatifloxacin determination. Herein, an efficient electrocatalyst was designed for the voltammetric determination of gatifloxacin based on carboxylated multiwalled carbon nanotubes warped ZnCo 2 O 4 nanoparticles (ZnCo 2 O 4 /MWCNT-COOH). The ZnCo 2 O 4 nanoparticles were synthesized by a green deep eutectic solvent-mediated ion-thermal route, and further composited with MWCNTs-COOH. The ZnCo 2 O 4 / MWCNT-COOH combined the catalytic activity of ZnCo 2 O 4 with the high electrical conductivity of MWCNT-COOH, aiming to improve the electrochemical sensing performance toward gatifloxacin. The synergistic interactions between ZnCo 2 O 4 and MWCNT-COOH endowed the ZnCo 2 O 4 /MWCNT-COOH with extraordinary catalytic activity for gatifloxacin oxidation . Consequently, the ZnCo 2 O 4 /MWCNT-COOH displayed a wide linear response range (0.01–10 μM) for detecting gatifloxacin, with a high sensitivity (29.64 μA μM −1 cm −2 ) and low detection limit (2.0 nM). The ZnCo 2 O 4 /MWCNT-COOH showed robust voltammetric responses against potential interfering species, and maintained highly stable responses for at least two weeks. Moreover, the ZnCo 2 O 4 /MWCNT-COOH/GCE was successfully used to detect gatifloxacin in water samples with satisfactory recoveries (97.22 − 104.5 %). Together with its low cost, environment friendly and rapid response, the ZnCo 2 O 4 /MWCNT-COOH shows promising prospects in trace detection of gatifloxacin.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Ruizhen Liu,Huaiyuan Jiang,Ping Li,Jianfei Yin,Zhengrui Xu,Xiaoyu Chen,Jian Cheng,Shuangxi Gu,Renliang Lyu
Antibiotic pollution has posed environmental risks, and the crucial point lies in the elimination efficiency of antibiotics from wastewater. Herein, a ternary-structured B-TiO 2 /Bi 2 S 3 /PCs (photonic crystals) film, in which B-TiO 2 was a blend of anatase and rutile crystalline phases, was fabricated to evaluate the efficiency of antibiotic photodegradation under visible light irradiation. The synthesized B-TiO 2 (80 %)/Bi 2 S 3 /PCs(458) film exhibited superior photocatalytic efficiency of tetracycline hydrochloride (TC), with a degradation rate 7.56 times greater than that of pristine B-TiO 2 . These findings are closely related to the excellent photoelectron separation of the heterojunction between B-TiO 2 and Bi 2 S 3 , as well as the bandgap reflection effect and light localization effect of the PCs . Notably, the B-TiO 2 (80 %)/Bi 2 S 3 /PCs(458) film also displayed favourable degradation performance for ofloxacin (OFLX) and ciprofloxacin (CIP), with degradation rates of 83.98 % and 72.79 %, respectively. Active species trapping experiments and electron spin resonance (ESR) measurements revealed superoxide radicals (•O 2 − ) and photogenerated holes (h + ) as the main active species. Furthermore, potential photodegradation pathways were proposed by analyzing the degradation intermediates of TC and OFLX via liquid chromatography-mass spectrometry (LC–MS). In a word, the B-TiO 2 (80 %)/Bi 2 S 3 /PCs(458) film exhibited high efficiency in the treatment of antibiotic pollutants, thereby offering promising prospects for practical application.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xuefeng Zhang,Qin Yang,Zixiao Li,Wenjing Tang,Asmaa Farouk,Mohamed S. Hamdy,Yingchun Yang,Xuping Sun
The electrochemical chlorine evolution reaction (CER) is an essential and valuable technology for converting Cl − to Cl 2 in industrial-scale applications. However, under the background of freshwater scarcity, seawater electrolysis for Cl 2 generation becoming highly demanded. Meanwhile, pollutant degradation in the ocean is still challenging, especially in coastal and offshore seawaters. Herein, we provide a facile approach for constructing a highly efficient system for simultaneous Cl 2 evolution and organic contaminant abatement utilizing Co 3 O 4 nanosheet arrays decorated carbon cloth (Co 3 O 4 /CC) anode in the marine environment. The fabricated Co 3 O 4 /CC electrode achieved a considerably low potential of 1.55 V to reach a current density ( j ) of 10 mA cm −2 and long-term stability of 12 h at 100 mA cm −2 in seawater (pH = 2). Meanwhile, the practical environmental remediation results attested that the Co 3 O 4 nanosheet arrays possess an outstanding Carbamazepine (CBZ) degradation efficiency of 100 % within 6 min accompanied with a k value of 0.358 min −1 in real seawater, demonstrating the integrity and reusability. The overall findings offer new insight into designing highly active CER catalysts with efficient pollutant degradation in the marine environment.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）