JOURNAL OF MOLECULAR LIQUIDS
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2017
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IF 3.648
Yuqin Wu,Hongmei Zhang,Yanqing Wang
In the present study, we have investigated the thermal stability of bovine serum albumin (BSA) in the presence of TiO 2 nanoparticles (TiO 2 NPs). The effects of TiO 2 NPs on the transportation function of BSA were also studied by fluorescence spectral method . The circular dichroism (CD) study revealed that addition of TiO 2 NPs moderately decreased the α-Helix content of the protein with the abruptly changing its tertiary structure by hydrogen bonding , van der Waals or electrostatic forces . It has been found that TiO 2 NPs acted as a structure destabilizer for BSA during the thermal denaturation process. The fluorescence quenching and molecular modeling data indicated the existence of strong interaction between BSA and the TiO 2 NPs surface that changed the binding affinities of some ligands for BSA, implying that TiO 2 NPs in blood will affect the transporting ability of serum albumin.
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ANALYTICA CHIMICA ACTA
·
2014
·
IF 4.517
Jintai Lin,Yuhui Zheng,Qianming Wang,Zhi Zeng,Cheng Cheng Zhang
A new type of Eu(III) ofloxacin complex as the fluorescent pH indicator has been presented. Compared to pure ligand, the complex offers more distinguished color changes (green–red–blue) derived from both lanthanide line emissions and the secondary ionization steps of ofloxacin. During the concentration dependence experiments, the photoluminescence studies on the complex showed that the excitation of this pH probe can occur at a very long wavelength which extends to visible range (Ex = 427 nm). Furthermore, the functional complex was successfully incorporated into soft networks and two novel luminescent hydrogels (rod and film) were fabricated. The soft materials also exhibited specific responses towards the pH variation. Finally, the onion cell-stain experiments were carried out to further confirm the validity of pH dependence and the results support the idea that the material will be suitable for monitoring biological samples in the future.
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JOURNAL OF SEPARATION SCIENCE
·
2014
·Vol. 38
·期 1
·134-140
·
IF 2.594
Dan Liu,Jiutong Ma,Yan Jin,Xiqian Li,Xiao Zhou,Qiong Jia,Weihong Zhou
This study describes the enrichment ability of ZnO-modified methacrylic acid- co -ethylene dimethacrylate polymer monoliths as stationary phases for the simultaneous determination of antibiotics (ofloxacin, ciprofloxacin, enoxacin, and pefloxacin) combined with high-performance liquid chromatography. The prepared monolith was characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, Fourier-transformed infrared spectroscopy, and thermogravimetric analysis. The polymer monolith microextraction method has been applied to the enrichment of fluoroquinolone antibiotics and satisfactory results were obtained in the analysis of water samples. Compared with the conventional methacrylic acid based monolith, the developed monolith exhibited a higher enrichment capacity because of the introduction of zinc oxide into the preparation process.
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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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DYES AND PIGMENTS
·
2015
·
IF 3.966
Jintai Lin,Xuan Xu,Wohua Zhou,Liudan Yu,Qianming Wang
Reaction of quinolone type antibiotics (enrofloxacin, ciprofloxacin, norfloxacin and ofloxacin) with lanthanide ions (Eu 3+ and Tb 3+ ) afforded eight kinds of complexes that can be dissolved in water. These compounds possess not only the advantages of long excited state lifetimes, but also allow excitation in the visible light range depending on the concentration variation. Especially the excitation wavelength of the terbium complexes can be extended into 405 nm. Theoretical studies demonstrated that the calculated energy gaps between HOMO and LUMO+1 orbital could be reduced and a dimeric structure was formed during the concentration experiments. Moreover, uniform and long rod-like structures (diameter: 100 nm; length: 10 μm) were achieved and concentration dependence has been investigated. The strategy of combining lanthanide characteristic emission nature and longer wavelength excitations can be applicable to the development of luminescent devices with controllable shapes.
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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.
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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.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Yifeng Xu,Xinyu Yang,Chuanzhou Liang,Lai Peng
This study synthesized Bi 24 O 31 Br 10 (BOB) to enhance the photocatalytic degradation of four common pharmaceutical compounds including ofloxacin (OFL), sulfamethoxazole (SMX), favipiravir (FAV) and ibuprofen (IBP). Characterization results demonstrated that BOB exhibited superior photocatalytic properties, including an extensive specific surface area, an optimal band gap and the presence of surface defects. Photocatalytic degradation experiments showed that BOB exhibited substantial adsorption capacity and photocatalytic efficiency for all four pharmaceuticals. Specifically, OFL, IBP, and FAV were removed by >95.5 % within 2 h, and SMX was removed by 57 % (10 mg L −1 pharmaceuticals/100 mg L −1 BOB). The adsorption was facilitated by Brönsted acid sites associated with oxygen vacancies and Lewis acid Bi sites. The degradation mechanism primarily involved key reactive species, including ·O 2 − , ·OH and h + . The degradation pathways for four pharmaceuticals were elucidated, as well as the biotoxicity of the products, which confirmed the alleviating potential of BOB-driven photocatalytic degradation on pharmaceuticals. These findings highlight the future potential of BOB-driven photocatalysis in mitigating pharmaceutical pollution in aquatic environments.
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Food Chemistry-X
·
2024
·
IF 6.5
Jingtao Wu,Yonghui Xia,Tianyu Wang,Yafeng Zhang,Guangli Li
An ultrasensitive and selective voltammetric platform combined a molecularly imprinted poly(pyrrole) membrane with Ag-nanoparticle-functionalized black phosphorus nanosheets (MIP/BPNS-AgNPs) was developed for trace GAT detection. The physicochemical properties of the MIP/BPNS-AgNPs were studied by various spectroscopic and electrochemical techniques. BPNS-AgNPs improved the ambient stability and electrochemical activity of the BPNS and possessed a large surface area for accommodating abundant templates to produce specific imprinted sites. The resulting MIP/BPNS-AgNP-modified glassy carbon electrode (GCE) greatly enhanced voltammetric responses for GAT. The MIP/BPNS-AgNP/GCE exhibited admirable GAT determination performance, with two linear responses (0.001–1 and 1–50 μM), high sensitivity (9.965 and 0.5378 μA μM −1 ), and a low detection limit of 0.2 nM. In addition, the MIP electrode could selectively detect GAT in complex matrices and retain roust responses for a month. The applicability of MIP/BPNS-AgNP/GCE toward the detection of GAT in pharmaceutical formulations, milk, and human serum was verified with satisfactory results.
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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.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2024
·
IF 4
Shumin Lin,Xiaoyu Zhang,Xiliang Li,Shu-xuan Liang
Residues of fluoroquinolones (FQs) have been identified as a threat to food safety, highlighting the need for effective detection methods in food samples. This study utilized a hydrothermal synthesis method to create Al-based metal-organic framework (Al-MOF) for pipette-tip solid-phase extraction of FQs in food matrices. Coupled with HPLC-FLD, a novel sample pretreatment method for simultaneous detection of three FQs was developed, demonstrating good linearity (1−500 ng/g) with R 2 values ranging from 0.9990 to 0.9998. Limits of detection and quantification were found to be 0.15−0.25 ng/g and 1.0−2.0 ng/g, respectively, with the relative standard deviations below 9.3 %. The extraction method showed promising results in animal liver and kidney samples, with a recovery rate of 75.2−103.6 %. Overall, this simple, rapid, and efficient method offers a valuable approach for analyzing trace levels of FQs in complex matrices.
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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.
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