RSC Advances
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2023
·Vol. 13
·期 12
·8227-8237
·
IF 3.9
Xiaofei Fu,Junwu Tao,Zizhou Zhao,Siwen Sun,Lin Zhao,Zuming He,Yong Gao,Yongmei Xia
Reducing the recombination rate of photoexcited electron–hole pairs is always a great challenging work for the photocatalytic technique. In response to this issue, herein, a novel Z-scheme CuInS2/In2O3 with interfacial S–O linkages was synthesized by a hydrothermal and subsequently annealing method. The Fourier transform infrared (FT-IR) and X-ray photoelectron spectrometer (XPS) measurements confirmed the formation of covalent S–O bonds between CuInS2 and In2O3. The quenching and electron spin resonance (ESR) tests revealed the Z-scheme transfer route of photogenerated carriers over the CuInS2/In2O3 heterojunctions, which was further verified theoretically via density functional theory (DFT) calculations. As expected, the CuInS2/In2O3 heterojunctions showed significantly boosted photocatalytic activities for lomefloxacin degradation and Cr(VI) reduction under visible light illumination compared with the bare materials. Accordingly, a synergistic photocatalytic mechanism of Z-scheme heterostructures and interfacial S–O bonding was proposed, in which the S–O linkage could act as a specific bridge to modify the Z-scheme manner for accelerating the interfacial charge transmission. Furthermore, the CuInS2/In2O3 heterojunction also exhibited excellent performance perceived in the stability and reusability tests. This work provides a new approach for designing and fabricating novel Z-scheme heterostructures with a high-efficiency charge transfer route.
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MICROCHIMICA ACTA
·
2022
·Vol. 190
·期 1
·1-9
·
IF 6.408
Wang Jiarui,Feng Juanjuan,Sun Min,Lian Yujing,Wang Minglin,Qiao Luqin
Sulfonic acid-functionalized covalent organic frameworks (COF-SO 3 ) as a coating of stir bar sorptive extraction (SBSE) for capturing three fluoroquinolones from milk have been developed. The COF-SO 3 material was characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and infrared spectroscopy. Milk without any typical treatments like protein precipitation and defatting was only diluted five times with water for test. Combined with high-performance liquid chromatography (HPLC), a SBSE-HPLC method was established for detecting fluoroquinolones in milk samples. The corresponding wide linear ranges (4.00–500.0 µg L −1 ), low detection limits (1.20–2.62 µg L −1 ), good test repeatability (RSD < 5.2%), and acceptable enrichment factors (56.2–61.5) were implemented for three fluoroquinolones. The analytical method was applied to determine trace targets and provided satisfactory results. Furthermore, the research displayed satisfied reproducibility for bar-to-bar (RSD < 6.5%) and batch-to-batch (RSD < 8.6%) tests. Graphical abstract
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yunhe Li,Hua Li,Siyuan Jiang,Yuerong Zhou,Dongran Cao,Xinrong Che,Ying Yang,Jiangwei Shang,Xiuwen Cheng
Adsorption plays a critical role in eliminating antibiotics in wastewater, so it is urgent to develop an effective adsorbent in the application. Palygorskite exhibits enormous potential in the field of adsorption. In this study, palygorskite was modified by MnO x into a suitable and efficient adsorbent by a simple method, and they were used for the application and comparison of adsorbing fluoroquinolone antibiotics from aqueous solution. The surface chemical properties of adsorbents were characterized by different analytical techniques, and the results were used to analyze the corresponding adsorption interactions. Statistical physics calculations were performed to explain the physical and chemical parameters involved in FQs adsorption mechanism. The highest adsorption efficiency was achieved at pH 3, and the maximum adsorption capacities of MnO x @Pal for CIP, ENR, LFX and LOM were 51.48 mg · g −1 , 40.46 mg · g −1 , 55.16 mg · g −1 and 52.13 mg · g −1 , respectively. Antibiotics adsorption mechanism of adsorbent is mainly due to electrostatic interaction and hydrogen bonding. The adsorbent can be desorbed more easily using NaOH solutions. This adsorbent is expected to be used to treat wastewater contaminated by fluoroquinolone antibiotics.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 3
·1-8
·
IF 6.408
Jin Yuting,Yan Rongfang,Wang Shuo,Wang Xianghong,Zhang Xuemei,Tang Yiwei
A novel fluorescence platform was fabricated for enrofloxacin determination by using cDNA-modified dipeptide fluorescence nanoparticles (FDNP-cDNA) and aptamer-modified magnetic Fe 3 O 4 nanoparticles (Fe 3 O 4 -Apt). The FDNP were prepared via tryptophan-phenylalanine self-assembling. When magnetic Fe 3 O 4 -Apt incubated with standard solution or sample extracts, the target enrofloxacin was selectively captured by the aptamer on the surface of the Fe 3 O 4 nanoparticles. After removing interference by washing with phosphate-buffered saline, the FDNP-cDNA was added, which can bind to the aptamer on the surface of the Fe 3 O 4 nanoparticles not occupied by the analyte. The higher the concentration of the target enrofloxacin in the standard or sample solution is, the less the FDNP-cDNA can be bound with the Fe 3 O 4 nanoparticles, and the more the FDNP-cDNA can be observed in the supernatant. Fluorescence intensity (E x /E m = 310/380 nm) increased linearly in the enrofloxacin concentration range 0.70 to 10.0 ng/mL with a detection limit of 0.26 ng/mL (S/N = 3). Good recoveries (88.17–99.30%) were obtained in spiked lake water, chicken, and eel samples with relative standard deviation of 2.7–6.2% ( n = 3). Graphical abstract
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xinyi Zhang,Yingjie Gao,Yunhe Li,Yuerong Zhou,Haiyan Ma,Jiangwei Shang,Xiuwen Cheng
As a promising method, coupled advanced oxidation processes (AOPs) based on the photocatalytic and peroxymonosulfate (PMS) activation has attracted extensive attention to degrade organic pollutants . Therefore, heterogeneous photosensitive PMS activators with high activity and excellent stability played a crucial role in this process need to be developed. In this study, magnetic NiFe 2 O 4 /CuS composite powder was successfully synthesized based on a simple solvothermal method combined with co-precipitation method, which was applied in the catalytic degradation process of lomefloxacin (LOM). The mass ratio of ingredients was optimized, while the physical and chemical properties of as-prepared samples were analyzed though a series of characterizations. In addition, under the illumination of simulated sunlight, 88.1% of LOM could be eliminated over 40 min with the addition of 0.8 g L −1 PMS and 0.6 g L −1 NiFe 2 O 4 /CuS (1:5) at pH 5.86 (unadjusted). Radical scavenging experiments and EPR test analysis were carried out to prove the contribution of different active species in the degradation process. Besides, the possible degradation mechanism was proposed. The intermediate products produced during the degradation of LOM were detected by the high-performance liquid chromatography/mass spectrometry (HPLC/MS), and the possible degradation pathways were deduced. Finally, the recyclability of NiFe 2 O 4 /CuS and the stability of the new degradation system were elucidated.
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CHINESE CHEMICAL LETTERS
·
2021
·
IF 6.779
Ruonan Guo,Ying Chen,Bingrui Liu,Ying Han,Jianfeng Gou,Xiuwen Cheng
The natural hematite ( α -Fe 2 O 3 ) is stable and abundant on the earth, as well as with strange electronic band structure and good visible light absorption properties. However, the composition and catalytic performance of natural hematite should be explored. In this study, the photo-assisted hematite nanoparticles activated persulfate (H-NPs/PS/vis) system was constructed. As detected, H-NPs had an irregular agglomerate structure with abundant internal pore and were mainly composed of Fe 2 O 3 , SiO 2 and TiO 2 . The system was applied to removing various antibiotic ( i.e. , lomefloxacin , ciprofloxacin and enrofloxacin with initial concentration of 10 mg/L), achieving high degradation performance of 82.0%, 81.2% and 82.2% after 120, 330 and 240 min, respectively. Moreover, H-NPs had excellent reusability with low metal leaching (Ti leaching percentage lower than 0.01%, Fe dissolution percentage was 0.48%) and stable structure. At last, a possible reaction mechanism of H-NPs/PS/vis system was proposed that lomefloxacin (LOM) was efficiently removed via the synergistic process of components contained in H-NPs with PS and light, involving the generation of • O 2 − , • OH and SO 4 •− . Above all, this paper provided a novel application scheme of natural hematite through in-depth and comprehensive experimental exploration.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·
IF 5.8
Li Zhili,Jiang Tianxiang,Huo Hanxin,Zhang Yizhong,Wang Xunliang,Guo Jian,Ma Yuhui
The facile fabrication of low-cost adsorbents possessing high removal efficiency and convenient separation property is an urgent need for water treatment. Herein, magnetic activated carbon was synthesized from spent coffee grounds (SCG) by Fe-catalyzed CO 2 activation at 800 °C for 90 min, and magnetization and pore formation were simultaneously achieved during heat treatment. The sample was characterized by N 2 adsorption–desorption, XRD, VSM, SEM, and FTIR. Batch adsorption experiments were conducted using lomefloxacin (LMO) as the probing pollutant. Preparation mechanism was revealed by TG-FTIR and XRD. Experimental results showed that Fe 3 O 4 derived from Fe species can be reduced to Fe by carbon at high temperatures, followed by subsequent reoxidation to Fe 3 O 4 by CO 2 , and the redox cycle between Fe and Fe 3 O 4 favored the formation of pores. The promotion effects of Fe species on CO 2 activation can be quantitatively reflected by the yield of CO as the signature gaseous product, and the suitable activation temperate range was determined to be 675 to 985 °C. The BET surface area, total pore volume, and saturated magnetization value of the product were 586 m 2 g −1 , 0.327 cm 3 g −1 , and 11.59 emu g −1 , respectively. The Langmuir model was applicable for the adsorption isotherm data for LMO with the maximum adsorption capacity of 95 mg g −1 , and thermodynamic analysis revealed that the adsorption process was endothermic and spontaneous. This study demonstrated that Fe-catalyzed CO 2 activation was an effective method of converting SCG into magnetic separable adsorbent for LMO removal from aqueous medium.
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Cuizhu Ye,Xingguang Chen,Dong Zhang,Junjun Xu,Huiting Xi,Tiantian Wu,Danwen Deng,Chunhong Xiong,Jinsheng Zhang,Ganhui Huang
Coated with polypyrrole (Ppy)-based molecularly imprinted polymer (MIP), 3D CoFe-metal organic frameworks (CoFe-MOFs) with gold nanoparticles (AuNPs) was developed for electrochemical trace detection of norfloxacin (NOR). On one hand, the trace detection of NOR was realized with MIP/CoFe-MOFs/AuNPs/Glassy carbon electrode (GCE). The effective surface area of the imprinted cavities capable of identifying NOR on MIP/CoFe-MOFs/AuNPs/GCE increased to 0.1058 cm 2 after 3D CoFe-MOFs/AuNPs was modified, which indicates that CoFe-MOFs/AuNPs could generate more imprinted cavities, thus contributing to a lower limit of detection (LOD) of 0.131 pmol L −1 (S/N = 3) with a wider linear range (5–100, 100–1000 and 1000–6000 pmol L −1 ). On the other hand, the recognition reaction to NOR by MIP/CoFe-MOFs/AuNPs/GCE is an irreversible electrochemical oxidation reaction involving an electron and a proton, controlled by a mixed adsorption-diffusion mechanism. Rapid and precise detection of NOR in prescription (norfloxacin capsules with the specification of 0.1 g) and pure milk with the recovery rates between 97.04 and 110.2% and the relative standard deviations (RSD) were less than 5.7%. The measured results by MIP/CoFe-MOFs/AuNPs/GCE were close to the commercial norfloxacin enzyme-linked immunosorbent assay (ELISA) kit, demonstrates its high potential to NOR trace detection in environmental and animal foods.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Zhijia Zhu,Chenmiao Zhu,Ruiying Yang,Lingfeng Yan,Chunyan Hu,Baojiang Liu
Exploring the efficient and sustainable photocatalysts is the key pot for the improvement of photocatalytic efficiency. In this work, a series of Bi 5 O 7 I/BiOIO 3 composite materials were successfully prepared via a mild hydrothermal method to make layered BiOIO 3 nanosheets uniformly grown in-situ on the smooth surface of Bi 5 O 7 I microrods. The electronic channel at the interface constructed by the in-situ growth could drastically shorten the distance of electron transmission to accelerate the electron transfer. The formation of Bi 5 O 7 I/BiOIO 3 heterojunction was determined via the characterization of the composition and photochemical analysis. Benefited from this structure, the Bi 5 O 7 I/BiOIO 3 with the mass ratio of 1:1 exhibited over 90% efficiency in degradation of 4 different antibiotics after irradiation for 120 min. After that, 5 cycles proved that Bi 5 O 7 I/BiOIO 3 has excellent stability and reusability, which can guarantee the application in the practical process. Finally, the electron migration path and photocatalytic mechanism of the catalyst are inferred base on the capture experiment and ESR test, which proposed that h + and ·O 2 - were the primary active species in the photocatalytic process and confirmed the formation of Z-type heterojunctions between Bi 5 O 7 I and BiOIO 3 . The heterostructure with well-matched band structure enhances the separation and migration of photogenerated charges, which contributes to improve the photocatalytic activity. The design of novel photocatalyst with high efficiency and low-toxicity provides a new approach to achieve full utilization of solar energy and efficient environmental purification.
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Analytical Methods
·
2020
·Vol. 12
·期 36
·4457-4465
·
IF 2.596
Meng Zhang,Jie Chen,Faqiong Zhao,Baizhao Zeng
In this work, a simple and sensitive method based on Fe3O4/multi-walled carbon nanotubes/ionic liquid (Fe3O4/MWCNTs/IL) as the adsorbent for magnetic solid phase extraction coupled with high performance liquid chromatography was developed for the determination of trace fluoroquinolones in foods. After a simple one-pot solvothermal synthesis, Fe3O4/MWCNTs were further modified with an amine-terminated ionic liquid to enhance their dispersibility and extraction capacity. The morphology, structure and magnetic properties of the composite adsorbent were characterized by transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction spectrometry and vibrating-sample magnetometry. Under the optimized extraction and detection conditions, the studied fluoroquinolones were enriched effectively and separated well and their UV signals were linear to their concentrations in the range of 4–1000 ng mL−1, with correlation coefficients ranging from 0.9958 to 0.9990. The enrichment factors were 29.1–43.9 fold and the limits of detection were 0.33–0.78 ng mL−1. The spiked recoveries were 85.4–105.9% for milk and 85.2–103.7% for pork samples, with relative standard deviations of 0.8–5.7%. The developed method provided a fast, sensitive and reliable determination platform for fluoroquinolones in complex real samples.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Xiangning Han,Hong Lin,Limin Cao,Xiangfeng Chen,Luefeng Wang,Hongwei Zheng,Ziang Zhang,Tushar Ramesh Pavase,Sai Wang,Xun Sun,Jianxin Sui
Purification of antibodies has become a critical factor in antibody production. A high-purity specific antibody against antigens, especially small molecules, seems to be difficult to obtain, even with the help of a protein A affinity column, which is a conventional and broadly used ligand for the separation of antibody and non-antibody proteins. Therefore, it is urgent to develop a cheap, simple, efficient, and stable method to separate the specific antibody from other antibodies. In this study, to improve the sensitivity and accuracy of immunoassay results, enrofloxacin (ENR) was grafted onto polyethylenimine (PEI) by the abundant amino groups and then the whole ligand (ENR–PEI) was conjugated to CNBr–Sepharose 4B to prepare the affinity column for the purification of the specific antibody against ENR from polyclonal antibodies. Scanning electron microscopy and Fourier transform infrared spectroscopy verification showed that Sepharose 4B was successfully modified by ENR–PEI with excellent uniformity. The capacity of the prepared column could reach to 6.15 mg of specific antibody with high purity per milliliter resin due to the high coupling ratio (49.3:1) of ENR on PEI, and the IC50 value of the antibody after purification was 47.58 ng/mL with a lowest limit of detection (IC10) of 1.099 ng/mL—18 times lower than those of the antibody purified through the protein A column. All the results showed that this new kind of resin could be used as the potential ligand in the purification of the trace-specific antibody against antigens in complex mixtures with high efficiency and specificity.
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FOOD CHEMISTRY
·
2020
·
IF 6.306
Kaili Yu,Mei-E. Yue,Jie Xu,Ting-Fu Jiang
A simple and sensitive salting out-assisted dispersive liquid-liquid microextraction method using deep eutectic solvent combined with back extraction and micellar electrokinetic capillary chromatography (SO-DLLME-DES-BE-MECC) was developed for the determination of fluoroquinolones in milk, honey and water samples. Several parameters affecting the extraction efficiency including DES volume, vortex time, centrifugation time, salt type and amount, sample pH and volume, etc. were investigated. Good linearity were obtained for fluoroquinolones in a range of 0.020–3.200 μg mL −1 and 0.030–4.800 μg mL −1 with LODs less than 0.010 μg mL −1 . The recoveries were in the ranges of 95.0–104.9%, 90.1–110.2% and 87.8–114.1% for water, honey and milk samples, respectively. The relative standard deviations for reproducibility were all below 7.6%. Under the optimized conditions, the enrichment factors for analytes were achieved in the range from 531 to 858 folds. The presented method was successfully applied for the determination of fluoroquinolones in milk, honey and water samples.
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