Journal of the Taiwan Institute of Chemical Engineers
·
2024
·
IF 5.5
Li Feng,Yanyan Liu,Yuxue Shan,Shuao Yang,Lanting Wu,Tianyu Shi
Background Ciprofloxacin (CIP) is a broad-spectrum antibacterial agent. Its extensive use has led to high frequency detection in various water environments, resulting in environmental pollution. The peroxymonosulfate-based advanced oxidation processes (PMS-AOPs) is a promising method for the removal of organic pollutants due to its low cost and high redox potential. Methods Magnetic CuS/MnFe 2 O 4 composites were successfully prepared using hydrothermal and solvothermal methods. The catalysts were characterized by XRD, SEM, TEM and VSM, and the degradation efficiency and mechanism of CIP by CuS/MnFe 2 O 4 /PMS system were investigated. Significant findings The results demonstrated that the magnetic CuS/MnFe 2 O 4 composites exhibited superior catalytic performance than pure CuS and pure MnFe 2 O 4 . Under optimized degradation conditions (CuS/MnFe 2 O 4 =15 mg/L, PMS=1 mM, CIP=20 mg/L, initial pH = 5.89, T = 25 ℃), 98.9 % of CIP was degraded within 60 min. Metal ions (Cu, Mn, Fe) on the catalysts surface played an important role in activating PMS, whereas low-sulfur species (S 2− and S n 2− ) promoted the Cu(II)/Cu(I), Mn(III)/Mn(II) and Fe(III)/Fe(II) cycles to accelerate the generation of free radicals. Additionally, S O 4 • − and 1O 2 were considered to be important reactive species in the CuS/MnFe 2 O 4 /PMS system. Finally, the magnetic CuS/MnFe 2 O 4 composites exhibited excellent recyclability and universality.
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CHEMOSPHERE
·
2024
·
IF 8.1
Yuliya E. Tyutereva,Olga A. Snytnikova,Dmitriy G. Sheven,Roman G. Fedunov,Vadim V. Yanshole,Vyacheslav P. Grivin,Ivan P. Pozdnyakov
Mechanism of direct UV photolysis of the zwitterionic and anionic forms of the quinolone antibiotic ciprofloxacin (CIP) was revealed by combination of nanosecond laser flash photolysis, steady-state photolysis coupled with high resolution LC-MS and DFT quantum-chemical calculations. For both forms, the main intermediate is a dissociative triplet state, which loses a fluorine ion to form a triplet carbocation; subsequent solvent attack of the latter leads to the formation of products of hydroxylation both the aromatic ring and the piperazyl substituent. Correspondingly, the quantum yield of photolysis of both CIP forms does not depend on the excitation wavelength, but depends on the concentration of dissolved oxygen. Secondary photolysis leads to a number of products of oxidation of the aromatic system, as well as oxidation, opening and full destruction of the piperazinyl substituent. The results obtained may be important for understanding the fate of quinolone antibiotics in UVC disinfection processes and in natural waters under the action of sunlight.
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Journal of Environmental Sciences
·
2018
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IF 3.12
Jie Li,Guangwei Yu,Lanjia Pan,Chunxing Li,Futian You,Shengyu Xie,Yin Wang,Jianli Ma,Xiaofu Shang
In this study, used tea leaves (UTLs) were pyrolyzed to obtain used tea-leaf biochar (UTC), and then the UTC was used as an adsorbent to remove ciprofloxacin (CIP) from aqueous solutions. Batch experiments were conducted to investigate the CIP adsorption performance and mechanism. The results showed that the CIP-adsorbing ability first increased and then declined as the UTC pyrolysis temperature increased. The UTC obtained at 450°C presented excellent CIP-absorbing ability at pH 6 and 40°C. The maximum monolayer adsorption capacity was 238.10 mg/g based on the Langmuir isotherm model. The pseudo-second-order kinetic equation agreed well with the CIP adsorption process, which was controlled by both external boundary layer diffusion and intra-particle diffusion. The characterization analysis revealed that the OH groups, C C bonds of aromatic rings, C H groups in aromatic rings and phenolic C O bonds play vital roles in the CIP adsorption process, and that the N C, N O, O C O and C OH groups of UTC were consumed in large quantities. π–π interactions, hydrogen bonding and electrostatic attraction are inferred as the main adsorption mechanisms. The present work provides not only a feasible and promising approach for UTLs utilization but also a potential adsorbent material for removing high concentrations of CIP from aqueous solutions.
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WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 235
·期 5
·1-13
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IF 3.8
Su Dan,Huang Jingyi,Li Yang,Chen Lin,Wang Yingru
This work found that rectorite (REC) has a good adsorption effect on cationic pollutants such as ciprofloxacin (CIP), with a maximum adsorption capacity of 79.73 mg/g for CIP. The zeta potential analysis showed that the electronegativity of the REC surface would be weakened after CIP adsorption under acidic conditions. Through adsorption kinetics, isotherm study, XRD, FTIR, and other characterizations, the phenomenon of reduced negative charge on the surface of REC adsorbed with CIP under acidic conditions was explained. Based on the Langmuir and Temkin models, the adsorption process of CIP on REC is a spontaneous endothermic adsorption process. The adsorption kinetics can be better described using a pseudo-second-order model, indicating that the adsorption rate is mainly controlled by chemical adsorption. The characterization further proved that REC adsorbed ciprofloxacin mainly through hydrogen bonding, cation exchange, and electrostatic gravitational interaction. CIP, as an emerging contaminant discharged into the water environment, will be harmful to the ecological environment and human health. Therefore, the utilization of REC for the removal of CIP from an aqueous solution has potential prospects.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2021
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IF 4.098
Xinan An,Xinyue Zhu,Jiaojiao Liu,Lina Zou,Gaiping Li,Baoxian Ye
Herein, a facile self-assembly through adenosine monophosphate (AMP) and luminol with Tb 3+ was employed to construct a dual-ligand coordinated AMP-Tb-luminol coordination polymers (CPs), which emitted the typical fluorescence of luminol. Based on the sensitization effect of ciprofloxacin (CIP) on the luminescence of Tb 3+ , a ratiometric sensor was fabricated using the fluorescence of luminol as an inert reference. The fluorescent intensity ratios of Tb 3+ to that of luminol enhanced linearly with the CIP concentration in the range from 5 nM to 2.5 μM with a lower limit of detection of 2 nM. In addition, the proposed ratiometric fluorescent sensor exhibited high selectivity for CIP, which could also be used to detect CIP in human blood serum (HBS) with satisfactory results. To our knowledge, this is the first demonstration of using dual-ligand coordination lanthanide (Ln)-based CPs for ratio-metric CIP assay, and this straightforward strategy may open up a new platform for designing the ratio-metric sensors based on the Ln CPs.
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REACTIVE & FUNCTIONAL POLYMERS
·
2025
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IF 5.1
Shaolin Deng,Xiaolin Yue,Ping Li,Haoyue Xie,Zehua Huang,Wenyuan Tan
In this study, core-shell magnetic molecularly imprinted polymers (MMIPs) were rationally designed using Fe 3 O 4 @SiO 2 nanoparticles as carriers for selective recognition and extraction of ciprofloxacin (CIP) in milk matrices. Compared with the reported molecularly imprinted polymers, The synthesized MMIPs demonstrated exceptional magnetic responsiveness enabling rapid solid-liquid separation. Static and dynamic adsorption studies revealed a maximum CIP adsorption capacity of 11.64 mg/g, Scatchard model analysis identified two distinct binding sites: high-affinity and low-affinity sites. Pseudo-second-order kinetics indicating chemisorption-dominated binding. Moreover, selective adsorption experiments confirmed high specificity toward CIP adsorption, with no significant interference from structural analogs. Coupled with HPLC-DAD, the method achieved sensitive detection of CIP with limits of detection (LOD) and limits of quantification (LOQ) values of 0.86 g/L and 2.6 g/L, respectively. In the practical application of commercial samples, the recovery rate was 84.11–99.11 %, and the precision (RSD)was 0.5–1.21 %, demonstrating robustness for CIP enrichment in complex milk products.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2026
·
IF 3.5
Jun Ma,Yang Jin,Jun Li,Lianyu Jia,Yun Yin
To achieve efficient degradation of ciprofloxacin (CIP), this work investigates the performance of a TiO 2 slurry system within the coiled flow inverter microreactor (CFIMR). The CFIMR utilizes its unique structural properties to induce chaotic mixing, thereby enhancing photon utilization and reaction kinetics in a slurry-phase environment. We systematically explored the influence of key operational parameters on the degradation process, specifically examining single residence time, catalyst dosage, initial CIP concentration, illumination methods, pH, and matrix composition. Comprehensive evaluations were conducted regarding the efficacy, stability, and overall efficiency of the system. Results indicate that the 98.49% degradation rate was achieved for a 10 mg/L CIP solution with a cumulative residence time of only 30 s under optimal conditions. The process exhibited an initial apparent reaction rate constant ( k app0 ) of 0.1539 s -1 and a space-time yield (STY) of 2880 m 3 pollutant per m 3 reactor per day. Notably, the CFIMR demonstrated superior performance compared to conventional reactors, with k app0 and STY increasing by two and one orders of magnitude, respectively. Furthermore, compared to the straight spiral tube microreactor (SSTMR), the CFIMR improved photon efficiency by 5.9% while reducing electrical energy per order ( E EO ) by 20%. This work provides a solid theoretical foundation for applying CFIMR in slurry-based photocatalysis. Download: Download high-res image (207KB) Download: Download full-size image
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JOURNAL OF ALLOYS AND COMPOUNDS
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2026
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IF 6.7
Yulin Ling,Jianhong Zhou,Xiaoyue Peng,Ye Xiao,Qingliang Chen,Jiangpeng Shen,Yuanqi Huang,kaihong Mao,Xiangbo Tang
Three-dimensional BiOI/WO 3 composite photoelectrodes were synthesized using a solvothermal method. Material characterization showed good crystallinity and purity, with BiOI nanosheets interlaced and firmly attached to WO 3 nanorods to form a three-dimensional structure. Using 2-methoxyethanol as the solvent, ultra-thin BiOI nanosheets were successfully synthesized. These nanosheets were closely combined with WO 3 nanorods and formed a large number of interlaced pore structures on their surfaces. As a result, the specific surface area was larger and the active sites were more numerous. The photoelectrodes utilized light with wavelengths below approximately 540 nm for catalytic degradation. The photoelectrode with an appropriate BiOI loading ratio (BIW-1.2) exhibited the strongest photoelectric performance and photoelectrocatalytic (PEC) degradation activity. When a 1.2 V bias was applied, a 20 mg/L ciprofloxacin solution was degraded with an efficiency of 97.1% after 3 h. The catalyst also maintained good stability over five cycles. Analysis of the band structure and reactive species indicated that the Z-scheme charge-migration mechanism, together with the applied bias, promoted efficient separation of photogenerated charges. The interlaced three-dimensional structure provides strong adsorption capacity, abundant catalytic sites, and high light-utilization efficiency, which together increase radical generation and enhance PEC performance.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2026
·
IF 3.5
Xiaofu Li,Tingfeng Xue,Junliang Ma,Zhibo Liu,Zejia Song,Bingyan Zhu,Liwei Pan,Jing Zhang
A bimetallic Mn-Co@γ-Al 2 O 3 catalyst was prepared • The catalyst effectively activates PMS for the mineralization of CIP • The catalyst enhances PMS activation via electronic, structural and active-site synergy • 1 O 2 is synergistically generated by LAS, oxygen vacancies and bimetallic redox cycles Ciprofloxacin (CIP) is recalcitrant to complete degradation by conventional treatment methods, and persulfate-based advanced oxidation processes often suffer low activation efficiency. In this study, a bimetallic Mn-Co@γ-Al 2 O 3 catalyst was developed to activate peroxymonosulfate (PMS) for the efficient mineralization of CIP. Under optimal conditions (1 mmol·L -1 PMS, pH=9), CIP was completely mineralized within 60 min. The catalytic activity of the bimetallic catalyst surpassed that of the single-metal Mn@γ-Al 2 O 3 and Co@γ-Al 2 O 3 , with a synergistic factor ( SF =1.12, >1) confirming a strong Mn-Co synergy. This synergistic effect results from coupled redox cycles, the inhibition of manganese oxide aggregation, and the presence of abundant Lewis acid sites and oxygen vacancies. The PMS system, primarily governed by singlet oxygen ( 1 O 2 ), effectively reduced the biotoxicity of CIP wastewater, increasing the germination rate of fescue seeds from 80% to 92%. A total of 14 degradation intermediates were identified. The excellent mineralization performance is closely associated with the unique CIP degradation pathway driven by 1 O 2 .
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MICROCHEMICAL JOURNAL
·
2026
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IF 5.2
Xingyi Wang,Lina Zhu,Mingming Zhang,Qin Ouyang
A GO integrated hydrogel UCNP sensor for ciprofloxacin detection. • Aptamer-functionalized UCNPs provide specific recognition for CIP. • UCNP-GO FRET disruption enables sensitive fluorescence response. • Ciprofloxacin detected at 1.34 × 10 −2 ng mL −1 , lower than most sensors. Ciprofloxacin residues in aquatic products pose significant threats to food safety and public health, yet sensitive and reliable detection in complex matrices remains challenging. Herein, a fluorescence “off-on” hydrogel sensing platform integrating graphene oxide (GO) and aptamer-functionalized upconversion nanoparticles (UCNPs) was developed for the sensitive detection of ciprofloxacin. Aptamer-functionalized UCNPs were embedded into a GO-incorporated hydrogel matrix, wherein GO acted as an efficient fluorescence quencher via fluorescence resonance energy transfer (FRET). In the absence of the target, the upconversion fluorescence was effectively quenched by GO, establishing a low-background “off” state. Upon specific recognition of ciprofloxacin by the aptamer, the resulting conformational change disrupted the FRET process, yielding pronounced fluorescence recovery (“on” state). Under optimized conditions, this target-triggered “off-on” switching strategy exhibited a good linear relationship over 0.1–100 ng mL −1 , with a detection limit of 1.34 × 10 −2 ng mL −1 . The integrated design combines aptamer-based target recognition, GO-mediated fluorescence quenching, and hydrogel-assisted probe confinement within a single sensing platform. The platform also demonstrated good selectivity toward ciprofloxacin. Satisfactory recoveries of 88.85%–97.72% were obtained in spiked aquatic product samples, showing good agreement with high-performance liquid chromatography (HPLC) analysis. This work provides a sensitive and practical strategy for antibiotic residue monitoring and holds great promise for food safety assurance in complex matrices. Download: Download high-res image (133KB) Download: Download full-size image
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Energy Sources Part A-Recovery Utilization and Environmental Effects
·
2021
·
IF 3.447
Yanzhen Fu,Zili Yang,Yangchao Xia,Yaowen Xing,Xiahui Gui
The feasibility of using discarded solid biomass as modified waste grapefruit peel (MWGP) for the removal of ciprofloxacin (CIP) pollutants from aqueous solution was explored in terms of equilibrium studies, kinetic studies, and adsorption mechanism elucidation. Characterization of MWGP by SEM and FTIR analyses indicate irregular pore structures and carboxylates as the active adsorption sites. Optimum adsorption conditions were determined in terms of pH, Na+/Ca2+ concentration, adsorbent time, adsorbent dosage, and initial concentration of CIP. Maximum uptake of CIP is 1.71 mmol·g−1 under optimal experimental conditions. Adsorption data fit the Langmuir isotherm model and the adsorption process follows pseudo-second order kinetics. Mechanistic studies showed that electrostatic, hydrophobic, hydrogen bonding, and π-π interactions are the main driving forces for CIP adsorption on MWGP. These findings suggest that MWGP is a promising adsorbent for the removal of CIP from aqueous solutions.
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MOLECULES
·
2023
·Vol. 28
·期 11
·4411
·
IF 4.6
Fuhua Wei,Kui Wang,Wenxiu Li,Qinhui Ren,Lan Qin,Mengjie Yu,Zhao Liang,Meng Nie,Siyuan Wang
This work studies the use of Fe/Ni-MOFs for the removal of ciprofloxacin (CIP) in wastewater. Fe/Ni-MOFs are prepared by the solvothermal method and characterized by X-ray diffraction (XRD), a scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FT-IR), and a thermal gravimetric analyzer (TG). Under the conditions of the concentration of 50 ppm, a mass of 30 mg, and a temperature of 30 °C, the maximum adsorption capacity of ciprofloxacin removal within 5 h was 232.1 mg/g. The maximum removal rate was 94.8% when 40 mg of the Fe/Ni-MOFs was added to the solution of 10 ppm ciprofloxacin. According to the pseudo-second-order (PSO) kinetic model, the R2values were all greater than 0.99, which proved that the adsorption theory of ciprofloxacin by Fe/Ni-MOFs was consistent with the practice. The adsorption results were mainly affected by solution pH and static electricity, as well as other factors. The Freundlich isotherm model characterized the adsorption of ciprofloxacin by Fe/Ni-MOFs as multilayer adsorption. The above results indicated that Fe/Ni-MOFs were effective in the practical application of ciprofloxacin removal.Keywords:metal–organic frameworks;antibiotics;adsorption
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