MICROCHIMICA ACTA
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2022
·Vol. 189
·期 4
·1-9
·
IF 6.408
Gao Xue,Sun Minjun,Liu Xiuying,Li Xuepeng,Li Jianrong
A simple smartphone-integrated ratiometric fluorescent sensing system for visual determination of copper ions (Cu 2+ ) and fluoroquinolones (FQs) was developed based on carbon dots (CDs) which were synthesized through the high-temperature pyrolysis of citric acid. In this system, with the fluorescence resonance energy transfer effect between CDs and 2,3-diaminophenazine (oxOPD), the detection of Cu 2+ and ciprofloxacin (CIP, an example for FQs) was realized. Cu 2+ catalyzes the oxidation of OPD to form oxOPD with yellow fluorescence, resulting in the quenching of CDs. In addition, CIP can inhibit the catalytic activity of Cu 2+ and induce the recovery of CDs fluorescence. Under the excitation of 400 nm, the changes of CDs fluorescence at 472 nm and oxOPD fluorescence at 556 nm were monitored. The detection results showed that the sensing system exhibited good selectivity and sensitivity to Cu 2+ and CIP with the limit of detection of 2.32 × 10 −8 mol L −1 and 0.2 ng mL −1 , respectively. In addition, a smartphone was developed as a portable analyzer to capture the change of fluorescence color and quickly analyze the concentration of Cu 2+ and CIP. The proposed smartphone-based sensing platform has satisfactory sensitivity, and it has application prospects for detecting Cu 2+ and FQs in food safety monitoring. Graphical abstract
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Boqiang Gao,Yu Pan,Qianqian Chang,Zhonghua Xi,Hu Yang
In this work, the sheet-like BiVO 4 with a higher exposure ratio of {0 1 0} facets was synthesized by the addition of TiCl 3 , and the ratio of (0 4 0)/(0 1 1) on {0 1 0}BiVO 4 was 2.85 times higher than that of normal decahedral BiVO 4 . Accordingly, the {0 1 0}BiVO 4 /Ag/CdS all-solid-state Z-scheme heterojunction was further constructed by photoreduction of Ag and chemical deposition of CdS on the well prepared {0 1 0}BiVO 4 successively. The performance and mechanism of {0 1 0}BiVO 4 /Ag/CdS in synergistic adsorption-photodegradation of fluoroquinolones (FQs) from water were investigated in detail. The adsorption-photodegradation could be divided into three processes: adsorption, surface degradation, and solution degradation, with the rate constants of 0.118, 0.029, and 0.012 min −1 , respectively. Accordingly, the adsorption was a rapid process due to the combined CdS in this composited photocatalyst had a high affinity to FQs to achieve an adsorption equilibrium on the surfaces<30.0 min. Besides, {0 1 0}BiVO 4 /Ag/CdS had a better separation efficiency of photogenerated electron-hole pairs than BiVO 4 /Ag/CdS, because the enriched {0 1 0} facets of {0 1 0}BiVO 4 caused more BiVO 4 /Ag/CdS ternary structure formed, and>90% photodegradation efficiency for five FQs ( C 0 = 0.062 mmol/L) was thus obtained within 60.0 min. The radical trapping and EPR results showed that holes and superoxide radicals were the main active species for FQs photodegradation. In summary, {0 1 0}BiVO4/Ag/CdS achieved an enhanced performance in synergistic adsorption and photodegradation of organic contaminants from water, and a talented photocatalyst was thus provided in water and wastewater treatment.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 3
·1977-1993
·
IF 4.682
Weng Peijie,Cai Qing,Wu Huadong,Zhang Linfeng,Wu Kun,Guo Jia
The flower-like CQDs/ S -Bi 4 O 5 Br 2 composites photocatalyst with high visible-light response is prepared by adjusting bismuth-rich, S -doped, and introducing carbon quantum dots (CQDs) into the bismuth oxybromide (BiOBr). Particularly, the prepared C 10 /S 6 –Bi 4 O 5 Br 2 composite shows the highest degradation efficiency for the ciprofloxacin (CIP) under visible-light irradiation with the apparent rate constants k of 0.03798 min −1 , which is 26.3 times and 10.1 times higher than that of BiOBr and Bi 4 O 5 Br 2 , respectively. The sulfur doping leads to the increase of the specific surface area and decreases of the band gap but retains the original flower-like morphology of Bi 4 O 5 Br 2 . Compared to the pure Bi 4 O 5 Br 2 , CQDs/Bi 4 O 5 Br 2 , and S -Bi 4 O 5 Br 2 , the CQDs introduction and S -doping can improve both of the light absorption range and intensity, as well as the charge transfer efficiency for the C 10 /S 6 –Bi 4 O 5 Br 2 composites. Furthermore, because of the combination of the CQDs and S doped for the Bi 4 O 5 Br 2 composites, the separation efficiency of photo-generated carriers is improved with the recombination rate greatly reduced. Graphical Abstract
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Nguyen Quang Tung,Do Thi Cam Van,Dam Xuan Thang,Nguyen Thi Kim An,Tran Thi Trang,Bui Dinh Nhi,Nguyen Phuong Thao,Le The Son,Nguyen Nhat Huy,Nguyen Trung Dung
In this study, the CuCoFe-LDH catalyst was synthesized by hydrothermal method and applied to degrade levofloxacin (LFX) by peroxymonosulfate (PMS) activation. The physicochemical properties of the synthesized samples were analyzed by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), Brunauer-Emmett-Teller (BET), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA). The influence of various factors such as catalyst system, pH, catalyst content, PMS , pH, and coexisting ions on the degradation of LFX was systematically investigated. The results showed that after 10 min, 94.57 % of LFX was decomposed under the conditions of 200 mg/L of catalyst, 500 mg/L of PMS, 10 mg/L of LFX, and pH 7.0. Besides, the CuCoFe-LDH/PMS system can effectively remove LFX over a wide pH range from 3.5 to 9.0. Both radical superoxide (O 2 •- ) and non-radical singlet oxygen ( 1 O 2 ) were major reactive oxygen species in the CuCoFe-LDH/PMS system. Mass spectrometry identified 16 major degradation products of LFX, and 38.43 % of LFX was mineralized after 30 min of reaction. Besides, the CuCoFe-LDH/PMS system had the ability to effectively degrade different groups of antibiotics (e.g., fluoroquinolone, tetracycline , and sulfonamide). The mechanism of PMS activation by CuCoFe-LDH and the LFX degradation pathway were proposed. Finally, testing the reusability of CuCoFe-LDH in LFX degradation showed that a decrease of nearly 7 % occurred after five consecutive cycles, suggesting its stability for practical applications.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2023
·
IF 4.3
Zhendong Yu,Bolong Liang,Zhe Zhao,Shumin Lin,Hongbin He,Shu-Xuan Liang
In this study, magnetic polystyrene polymers (Fe 3 O 4 @PLS) with both hydrophilic and hydrophobic groups were synthesized for magnetic solid-phase extraction. Experimental parameters, including solution pH, adsorption time, elution solvent, elution volume and elution time, were optimized. A magnetic solid-phase extraction method using Fe 3 O 4 @PLS as adsorbent for three fluoroquinolones (FQs), including enrofloxacin , ofloxacin and ciprofloxacin , in milk substrates was established with high-performance liquid chromatography. Under the optimized experimental conditions, the limits of detection of the three FQs were 0.41–0.45 µg/kg and the limits of quantitation of the three FQs were 1.37–1.51 μg/kg. The recoveries of three FQs in milk samples were 96.5–118.6%. The method was successfully applied to the detection of three FQs in 20 kinds of milk. The results showed that the proposed method had the advantages of easy operation, rapid and efficient enrichment and separation of analytes, which proved its reliability and applicability. The adsorption property of Fe 3 O 4 @PLS was significantly improved compared with ProElut polystyrene polymers (PLS), which provided a new idea for the development of magnetic polymer materials and expanded the application of magnetic polymers in the pretreatment of complex samples.
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ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Jun Yao
Background The residues of kanamycin can accumulate in the human body for a long time and pose serious health risks, including hearing loss , kidney poisoning, and drug allergic reactions. Therefore, it is crucial to develop a rapid, highly sensitive, and low-cost method for detecting kanamycin residues in foods. However, the current methods have limitations such as low sensitivity, expensive instruments, and multiple steps, which make them impractical for use in resource-limited environments and emergencies. In this study, the creation of a multiple-signal amplification photoelectrochemical biosensor to address these aforementioned issues is discussed. Results Herein, we proposed a multiple signal amplification photoelectrochemical (PEC) biosensor based on carboxylated g-C 3 N 4 and avidin functionalized Ru@SiO 2 for the ultrasensitive detection of kanamycin. The carboxylated g-C 3 N 4 was a highly efficient photoactive substance for amplifying photoelectric signals and a substrate for aptamer immobilization. The DOS and PDOS of g-C 3 N 4 were studied by simulation, and the sensing mechanism of the probe at the molecular level was revealed. Meanwhile, using Ru@SiO 2 as a signal amplifying unit, through the cooperative work between Ru@SiO 2 and g-C 3 N 4 , the photoelectric signal could be double amplified to produce an excellent photocurrent response. Under optimized conditions, the photocurrent response of the PEC biosensor to kanamycin was obtained at concentrations from 0.1 nM to 1000 nM with a lower detection limit of 4.1052 × 10 −11 mol L −1 . This protocol demonstrates high sensitivity, brilliant specific recognition ability, excellent reproducibility, and acceptable stability. Significance The first combination of g-C 3 N 4 and avidin-Ru@SiO 2 as photocurrent materials greatly enhanced the sensitivity of the PEC biosensors. Moreover, the specificity and sensitivity of the PEC biosensor were further improved through the specific interaction between kanamycin and aptamer. The photoelectric conversion mechanism based on g-C 3 N 4 and two pathways for enhancing the photocurrent by Ru(byp) 3 2+ were proposed. Through simulations of the DOS and PDOS of g-C 3 N 4 , the sensing mechanism of the probe at the molecular level was revealed. Under the optimum conditions, the PEC biosensor exhibited a wide linear concentration range and a low detection limit.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Yan Wu,Ling-Hui Kong,Rong-Fang Shen,Xiao-Jing Guo,Wen-Ting Ge,Wen-Jie Zhang,Zhen-Yue Dong,Xi Yan,Yan Chen,Wan-Zhong Lang
Herein, highly dispersed Fe species supported on activated carbon (CA-Fe-C) was fabricated with the aid of citric acid , showing excellent catalytic performance and stability for the degradation of rhodamine B (RhB) through peroxymonosulfate (PMS) activation. The radical quenching study, electron paramagnetic resonance (EPR) measurement and PMS consumption analysis confirmed the RhB degradation mechanism involving reactive radical species attacking RhB and non-radical oxidation pathway. The main degradation intermediates were identified by LC-MS, and the possible RhB degradation pathways were deduced. A multivariate quadratic polynomial model was developed using the response surface methodology (RSM) to examine how the removal of RhB was influenced by several quantifiable factors, with the objective of optimizing RhB removal. The analysis of variance (ANOVA) was used to evaluate the adequacy and significance of the proposed model. The effects of solution pH values, initial concentration, inorganic anions, PMS dosage, catalyst dosage, and metal loading amount on RhB removal were investigated. The method of initial rates was employed to determine the intrinsic reaction rate law, and the reaction was identified to follow the Langmuir-Hinshelwood (L-H) kinetics model.
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Journal of Materials Chemistry B
·
2022
·Vol. 10
·期 32
·6187-6193
·
IF 7.571
Lulan Yang,Xingyue Chen,Xu Wen,Jiaming Tang,Xiaoling Zheng,Jiaqi Li,Lingling Chen,Shuang Jiang,Tao Le
Sulfadiazine (SDZ) residues in food products and the environment pose a serious threat to human health and ecological balance, thereby warranting the development of new methods for simple, rapid and accurate detection of these compounds. To this end, we developed a novel label-free dual-modal aptasensor for SDZ detection based on distance-dependent color change of gold nanoparticles (AuNPs) and fluorescence resonance energy transfer between AuNPs and rhodamine B (RhoB). In this aptasensor, the binding of the aptamer to SDZ causes unprotected AuNPs to aggregate in NaCl solution, which alters the color of the solution and restores the fluorescence of RhoB. Under optimal conditions, the aptasensor exhibited a linear colorimetric response in the SDZ concentration range of 50–1000 ng mL−1, and a linear fluorescence response in the SDZ concentration range of 4–256 ng mL−1. The limits of detection for colorimetric and fluorescent readings were 28 ng mL−1 and 2 ng mL−1 respectively. The recoveries of SDZ in the spiked real samples were 88.28–108.44% by colorimetry and 90.27–106.04% by fluorometry. Furthermore, the results of this aptasensor showed excellent correlation (R2 ≥ 0.9858) with HPLC findings. Taken together, these experimental results demonstrate that the proposed label-free dual-modal aptasensor can be employed to screen for SDZ contamination in food and environmental samples.
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Materials Today Chemistry
·
2023
·
IF 7.3
L. Wang,D. Wang,Y. Tao,J. Wang,M. Tian,Q. Liu,Y. Yang,Y. Zou,F. Ke,X. Guo,X. Li,D. Gao
Phenylboronic acid functionalized high-crystallinity fluorescent covalent organic framework ( [email protected] ), which can be applied for rifamycin antibiotics and water sensing, and for rifamycin antibiotics adsorption, was synthesized for the first time. To effectively form [email protected] by post-synthetic modification, a fluorescent COF (COF–OMe) was prepared using deep-eutectic solvent as solvent without using catalyst. The [email protected] showed good fluorescence property and adsorption capacity, which owned superior effects in detecting and adsorbing rifampicin, rifapentine, and rifabutin. The results of fluorescence quenching mechanisms showed that internal filtration effect, dynamic quenching, and photoinduced electron transfer were the major mechanisms. Moreover, mainly due to the pore selectivity of [email protected] , hydrogen bonding, and π-π interaction, [email protected] showed good selectivity for three antibiotics. Finally, a dual-function platform based on [email protected] was successfully developed for sensing and adsorbing three antibiotics from various samples. Besides, [email protected] also showed good effect to detect water amount in ethanol (0.1−50%, v/v).
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MOLECULES
·
2023
·Vol. 28
·期 22
·7496
·
IF 4.6
Qian Han,Ling Fan,Xiuying Liu,Yiwei Tang,Pingping Wang,Zaixi Shu,Wei Zhang,Lijie Zhu
Quantum dot nanobeads (QBs) were used as signal source to develop competitive lateral flow immunoassay (LFIA) for the detection of chloramphenicol (CAP). The quantitative detection of CAP was achieved by calculating the total color difference (∆E) values of the test line (T line) using the images of test strips. QB-based LFIA (QBs-LFIA) allowed the effective dynamic linear detection of CAP in the range of 0.1–1.5 ng/mL. The limit of detection (LOD) was 3.0 ng/mL, which was 50 and 667 times lower than those achieved for two different brands of colloidal gold kits. The recoveries of CAP during real-sample detection were 82.82–104.91% at spiked levels of 0.1, 0.7, and 1.5 ng/mL. These results indicate that the developed QBs-LFIA facilitates the sensitive detection of CAP.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Lingjun Geng,Jiashuai Sun,Mengyue Liu,Jingcheng Huang,Jiwei Dong,Zhen Guo,Yemin Guo,Xia Sun
In this paper, an electrochemical sensor based on a dual recognition strategy of molecularly imprinted polymers (MIPs) and aptamer (Apt) has been designed for the high sensitivity detection of chloramphenicol (CAP). Here, MIPs and Apt have provided dual recognition sites to greatly improve the specific recognition ability of the sensor. Chitosan-multi-walled carbon nanotubes (CS-MWNTs) and AuNPs (gold nanoparticles) have been used for their excellent electrical conductivity. When CAP existed in the detection environment, the imprinted cavities with specific recognition ability bound to CAP through forces such as hydrogen bonds. It hindered the rate of electron transfer and resulted in a decrease in current value. Quantitative detection of CAP could be achieved after analyzing the relationship between the concentration of CAP and the change of current value. After optimizing the experimental parameters, the detection range of the sensor was 10 −8 g/L-10 −2 g/L with the limit of detection of 3.3 × 10 −9 g/L, indicating that the sensor had a high practical application potential.
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BIORESOURCE TECHNOLOGY
·
2023
·
IF 11.4
Yanzhuo Zhang,Yutai Sun,Rui He,Jing Zhao,Jiqin Wang,Tonghuan Yu,Xiaozhuan Zhang,Alexandr V. Bildyukevich
Simulation of microbial aging biochar in compost is an important index for evaluating the biochar degradation efficiency of antibiotics. In this study, biochar was prepared by adding microplastics (MPs) to sludge, and the degradation effect of biochar/(peroxymonosulfate, PMS) on antibiotics was evaluated during the compost aging process of biochar. After the compost aging of biochars, the antibiotic degradation efficiency of HPBC500, HPBC500 + polystyrene (PS), HPBC900/PMS, and HPBC900 + PS/PMS decreased by 6.47, 15.2, 10.16, and 10.33 %, respectively. Environmentally persistent free radicals (EPFRs) and defect structure were the main contributors to the activation of PMS. EPFRs produced through PS pyrolysis of biochar exhibited strong reactivity but poor stability during the degradation of antibiotics. Biochar enhanced the growth of microorganisms in compost but reduced its specific surface area. The antibiotic degradation efficiency of the biochar was positively correlated with the concentration of EPFRs. This study elucidated the durability of different biochar toward antibiotic degradation.
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