Journal of Photochemistry and Photobiology A-chemistry最新文献

{"title":"Investigating the excited state dynamics and two-photon absorption of β-functionalized neutral and cationic meso-tetraphenylporphyrins","authors":"Diego F. de Oliveira ,&nbsp;Carolina S. do Nascimento ,&nbsp;Nuno M.M. Moura ,&nbsp;M. Amparo F. Faustino ,&nbsp;Cleber R. Mendonça ,&nbsp;Leonardo De Boni","doi":"10.1016/j.jphotochem.2025.116724","DOIUrl":"10.1016/j.jphotochem.2025.116724","url":null,"abstract":"<div><div>Photophysical characterization of recently developed <em>meso</em>-tetraphenylporphyrin-pyrrolidine/pyrroline conjugates with potential in photodynamic inactivation was performed, including both neutral and cationic derivatives. Cationic compounds exhibited red-shifts in both absorption and emission spectra, alongside reduced absorption intensities, likely reflecting conformational distortions. Fluorescence quantum yields ranged from 0.6 % to 7.1 %, with cationic porphyrins consistently less emissive than their neutral analogues, and their fluorescence lifetimes were likewise decreased. Triplet quantum yields were determined using the Consecutive Laser Pulse Excitation (CLPE) method, reaching up to 34 % for neutral and 26 % for cationic derivatives. Internal conversion was the dominant decay pathway across all the derivatives. According to the calculated rates, the decrease in fluorescence and triplet formation observed for cationic derivatives was mostly due to the increase in the non-radiative decay path. Heavy-atom effect promoted by the iodide counterion may be one of the main causes for this effect. Two-photon absorption cross-section spectra were determined for all the samples using a fluorescence-based technique. Measurements between 820 nm and 1400 nm revealed that two-photon absorption enables the same transitions as one-photon absorption. This behavior indicates a symmetry-breaking effect in the molecule, induced by the solvent and peripheral substituents. A region of enhanced two-photon absorption was observed near 800 nm, aligning with the first biological window, making it particularly promising for biomedical applications. While the added charge reduced one-photon absorption values, it had minimal impact on the two-photon absorption cross-section or two-photon brightness of these samples.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"471 ","pages":"Article 116724"},"PeriodicalIF":4.7,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Systematic development and comprehensive validation of a green spectrofluorimetric method for enalapril determination: response surface optimization, mechanistic investigation with application to pharmaceutical and bioanalytical samples","authors":"Reem M. Alnemari ,&nbsp;Rami M. Alzhrani ,&nbsp;Maram H. Abduljabbar ,&nbsp;Farooq M. Almutairi ,&nbsp;Muneef M. Aldhafeeri ,&nbsp;Yusuf S. Althobaiti ,&nbsp;Atiah H. Almalki ,&nbsp;Mona A. Abdel Rahman ,&nbsp;Ahmed Serag","doi":"10.1016/j.jphotochem.2025.116720","DOIUrl":"10.1016/j.jphotochem.2025.116720","url":null,"abstract":"<div><div>A sensitive, selective, and environmentally friendly spectrofluorimetric method was developed and validated for the determination of enalapril, an antihypertensive drug, using eosin Y as a fluorescent probe. At acidic pH, an ion-association complex is formed between enalapril and eosin Y, resulting in the quenching of the dye's fluorescence. The quenching mechanism was systematically investigated using temperature-dependent Stern-Volmer analysis (298–313 K), Job's method, thermodynamic characterization, and quantum mechanical calculations, revealing a static mode of interaction with Stern-Volmer constants decreasing from 8.22 × 10⁵ M⁻¹ (298 K) to 6.17 × 10⁵ M⁻¹ (313<em>K</em>). Comprehensive thermodynamic analysis provided negative enthalpy and negative entropy changes, indicating highly exothermic binding dominated by strong electrostatic interactions with loss of translational freedom upon complex formation. Job's ratio confirmed 1:1 stoichiometry with maximum at mole fraction 0.5 while PM3 quantum mechanical calculations identified the binding site between the protonated amino group of enalapril and carboxylate group of eosin Y, confirming 1:1 complex formation. Factors affecting the quenching process, including pH, buffer volume, and reagent volume, were optimized using response surface methodology with a central composite design. Significant modeling parameters were identified through ANOVA, and a reduced quadratic model was developed and validated, demonstrating good predictive ability. Numerical optimization was then performed to maximize the quenching efficiency. The proposed method was fully validated according to ICH guidelines, exhibiting excellent linearity in the range of 0.05–1.5 μg/mL, with a limit of detection of 0.0147 μg/mL. Moreover, accuracy, precision, and robustness were within acceptable limits. The developed method was successfully applied for the determination of enalapril in pharmaceutical formulations and spiked human plasma samples with satisfactory results. Statistical comparison to a reported HPLC method revealed comparable analytical performance. Furthermore, the environmental impact and analytical practicality of the method were evaluated using AGREE and BAGI tools, respectively, indicating that the proposed spectrofluorimetric technique offers a greener and practical alternative to traditional HPLC methods for routine quality control and therapeutic drug monitoring of enalapril showcasing its potential for widespread application in the pharmaceutical industry and clinical settings.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"471 ","pages":"Article 116720"},"PeriodicalIF":4.7,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144908243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Innovative design of Bi4O5l2/Bi7O9I3-C composites for reinforced piezophotocatalytic treatment of color and colorless pollutants under LED radiation and ultrasonic power","authors":"Bassim H. Graimed ,&nbsp;Zaid H. Jabbar ,&nbsp;Huda S. Merdas ,&nbsp;Saad H. Ammar ,&nbsp;Raad Farhan Shahad ,&nbsp;Ali Majdi","doi":"10.1016/j.jphotochem.2025.116717","DOIUrl":"10.1016/j.jphotochem.2025.116717","url":null,"abstract":"<div><div>This work introduces a novel fabrication of Bi₄O₅l₂/Bi₇O₉I₃-C composites via the ultrasonic-assisted wet impregnation strategy. Robust characterizations, such as XRD, FTIR, SEM, TEM, BET, UV–Vis DRS, PL, and EIS, were employed to identify the ternary heterojunction and its components. Developing Bi₄O₅l₂/Bi₇O₉I₃-C heterojunction could significantly boost piezoelectric and photocatalytic properties. The light utilization was expanded by incorporating carbon nanoparticles into Bi₄O₅l₂/Bi₇O₉I₃, which promotes electrical conductivity and narrows the band gap of composites. The piezocatalytic, photocatalytic, and piezophotocatalytic activity of Bi₄O₅l₂/Bi₇O₉I₃-C was tested for the degradation of color and colorless organic pollutants, like crystal violet (CV), malachite green (MG), tetracycline (TC), and levofloxacin (LFX). The Bi₄O₅l₂/Bi₇O₉I₃-C showed powerful piezophotocatalytic treatment in a short time (40 min) with removal efficiencies of 97.5 %, 100 %, 91.3 %, and 94.4 % against CV, MG, TC, and LFX, respectively. The first-order kinetics revealed the superiority of piezophotocatalytic efforts of Bi₄O₅l₂/Bi₇O₉I₃-C, which is 5.36 and 1.67 times greater than sole piezocatalytic and photocatalytic, respectively. The integrated work of piezoelectric force, light irradiation, and <em>Z</em>-scheme charge mode exhibited rapid charge separation, boosted charge generation, and positive valence band potential, resulting in enhanced piezophotocatalytic performance. Ultimately, our study encourages the employment of Bi-based catalysts in piezophotocatalytic fields to improve the degradation efficiency and reduce the pollutant degradation time.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"471 ","pages":"Article 116717"},"PeriodicalIF":4.7,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144903098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"In vitro eradication of Fusarium oxysporium conidia using light-triggered thiopyridinium porphyrin-cyclodextrin dyes","authors":"Claudia P.S. Ribeiro ,&nbsp;Isabel N. Sierra-Garcia ,&nbsp;Ângela Cunha ,&nbsp;Leandro M.O. Lourenço","doi":"10.1016/j.jphotochem.2025.116719","DOIUrl":"10.1016/j.jphotochem.2025.116719","url":null,"abstract":"<div><div>The genus <em>Fusarium</em> comprises filamentous fungi widely distributed in soil and plants, representing threats to various organisms, including plants, animals, and humans. Conventional fungicides have limitations, leading to a growing interest in sustainable control methods such as photodynamic inactivation (PDI) of microorganisms. This study evaluates the antifungal photodynamic activity of <em>meso</em>-substituted porphyrin derivatives (H₂Pors <strong>1a</strong>–<strong>3a</strong>), which each structure is composed by three thiopyridinium groups and one cyclodextrin group (α-, β-, or γ-CD). These water-soluble porphyrin-cyclodextrin derivatives were prepared and tested on <em>Fusarium oxysporium</em> conidia. Photoinactivation tests were conducted at different concentrations (1.0, 2.5, and 5.0 μM) under white light exposure at an irradiance of 25 mW.cm^{−<strong>2</strong>} for 60 min (light dose of 90 J.cm^{−<strong>2</strong>}). Fungal inactivation was observed for all molecules at the highest tested concentration. H₂Por <strong>3a</strong> demonstrated the strongest PDI effect, achieving complete inactivation of the conidia (5.0 log₁₀ viability reduction) at 2.5 and 5.0 μM and partially at 1.0 μM (∼3.0 log₁₀ viability reduction). H₂Por <strong>1a</strong> showed similar results to H₂Por <strong>3a</strong> at the highest concentration, but was less effective at the lowest concentration. H₂Por <strong>2a</strong> showed partial inactivation of the fungi at the highest tested concentration of 5.0 μM (2 log₁₀ viability reduction). This lower antifungal activity is attributed to the β-CD forming aggregates in water. These findings suggest that H₂Pors <strong>1a</strong> and <strong>3a</strong> are promising drugs for the photoinactivation of <em>F. oxysporium</em> conidia.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"471 ","pages":"Article 116719"},"PeriodicalIF":4.7,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144913532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation and application of carbon dot composite materials with long-lasting phosphorescence emission under extreme acidic and alkaline conditions","authors":"Jian Wang ,&nbsp;Lei Xue ,&nbsp;Ling Chen ,&nbsp;Jian Zhou","doi":"10.1016/j.jphotochem.2025.116714","DOIUrl":"10.1016/j.jphotochem.2025.116714","url":null,"abstract":"<div><div>Carbon dots (CDs), as a novel luminescent material, have demonstrated broad application prospects in fields such as bioimaging, sensing, and information encryption. However, their room temperature phosphorescence (RTP) performance is susceptible to environmental factors (e.g., oxygen, moisture, and pH), with stability and luminescence efficiency under extreme pH conditions remaining significant challenges. In this study, a cross-linked hydrogen bond network was constructed through a one-step hydrothermal method using 3-aminophenylboronic acid and biuret as raw materials. The resulting MB-II composite material exhibits an ultra-long phosphorescence lifetime (1.48 s) and exceptional stability in aqueous solutions across a broad pH range (pH = 1–14) and organic solvents. This breakthrough surpasses the environmental adaptability limitations of current materials. The design integrates surface state engineering regulated by pH and optimized CD-matrix interactions, providing new perspectives for information encryption and biosensing under extreme conditions.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"471 ","pages":"Article 116714"},"PeriodicalIF":4.7,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144896017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photochemistry of sodium tetrathionate in aqueous solutions","authors":"Veronica V. Semionova ,&nbsp;Evgeni M. Glebov ,&nbsp;Vjacheslav P. Grivin ,&nbsp;Roman G. Fedunov ,&nbsp;Evgeniya A. Isaeva ,&nbsp;Nikolai B. Egorov","doi":"10.1016/j.jphotochem.2025.116721","DOIUrl":"10.1016/j.jphotochem.2025.116721","url":null,"abstract":"<div><div>Photochemistry of tetrathionate anion S₄O₆²⁻ in aqueous solutions was studied by means of stationary photolysis and laser flash photolysis. Quantum yield of S₄O₆²⁻ disappearance was found to change from 0.05 to 0.2 depending on the irradiation wavelength and the presence of dissolved oxygen. Deep photolysis leads to the sol formation. S₂O₃^•- radical absorption was detected in the laser flash photolysis experiments. For quantitative description of the laser flash photolysis data, two channels of S₄O₆²⁻ photodissociation were proposed. The first channel yields in formation of two S₂O₃^•- radical anions; in the second channel S₂O₃^•- and SO₃^•- radical anions and a sulfur atom are formed. Surprisingly, the results of the laser flash photolysis experiments did not depend on the presence of dissolved oxygen. This fact was explained by the formation of the weakly-bound van der Waals complexes [S₄O₆²⁻…O₂]. At the experimental conditions all the dissolved oxygen molecules are bound and cannot react with the primary radical anions. In conditions of stationary photolysis, oxygen is photochemically released and can react with other intermediates, increasing the quantum yield of tetrathionate photodecomposition.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"471 ","pages":"Article 116721"},"PeriodicalIF":4.7,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144908106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced photocatalytic degradation of norfloxacin via SPR effect in CuNi/TiO2-x composite under visible light","authors":"Shishu Sun ,&nbsp;Tianyi Sun ,&nbsp;Dashuai Zhang ,&nbsp;Jinrui Liu ,&nbsp;Liying Ren ,&nbsp;Chuilong Chen ,&nbsp;Wei Yao ,&nbsp;Zaifeng Shi","doi":"10.1016/j.jphotochem.2025.116710","DOIUrl":"10.1016/j.jphotochem.2025.116710","url":null,"abstract":"<div><div>In this paper, the synthesis, characterization, and photocatalytic performance of CuNi/TiO_2-x composites in the degradation of antibiotic Norfloxacin (NOR) under visible light were investigated. Compared to conventional TiO₂, the composite catalyst demonstrated superior photocatalytic activity by introducing CuNi nanoparticles and oxygen vacancy in TiO₂. The oxygen vacancy defect in titanium dioxide crystal reduced the band gap energy. In addition, the incorporation of Cu nanoparticles leveraging Surface Plasmon Resonance (SPR) and Ni nanoparticles as electron traps further markedly enhanced the electron-hole pair separation efficiency and solar energy utilization, catalyzing NOR degradation efficiently. Electron Spin Resonance (ESR) confirmed the generation of reactive oxygen species, which was pivotal to the NOR degradation. This study underscores the potential of bimetallic composites for environmental remediation, particularly in treating antibiotic-laden wastewater.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"471 ","pages":"Article 116710"},"PeriodicalIF":4.7,"publicationDate":"2025-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144892312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ACCys: A fluorescent probe for highly sensitive tandem detection of aluminum (III), copper (II), and cysteine","authors":"JunHyuk Kim ,&nbsp;Arun Dattatray Kulthe ,&nbsp;Ye Chan Jung ,&nbsp;Neha Jain ,&nbsp;David G. Churchill ,&nbsp;Taisun Kim ,&nbsp;Satish Balasaheb Nimse","doi":"10.1016/j.jphotochem.2025.116704","DOIUrl":"10.1016/j.jphotochem.2025.116704","url":null,"abstract":"<div><div>Aluminum and copper are associated with health risks and environmental concerns and have been mandated by WHO, among other agencies, as having a low limit of toxicity. Therefore, a simple and cost-effective method to detect and track Al³⁺ and Cu²⁺ in biological and environmental samples using fluorescence probe is paramount in biomedical research. In this study, we developed a novel Schiff base fluorescent probe <strong>ACCys</strong> (C₁₇H₁₆O₄N₂) bearing phenol and hydrazone groups for the selective and tandem detection of Al³⁺, Cu²⁺, and cysteine (Cys). <strong>ACCys</strong> exhibited a fluorescence “turn-on” response in the presence of [Al³⁺], a “turn-off” response in the presence of [Cu²⁺], and a fluorescence recovery with [Cys] addition. The binding stoichiometry, binding constants, and electronic properties were confirmed using spectroscopic and density functional theory (DFT) studies. <strong>ACCys</strong> demonstrated excellent sensitivity for Al³⁺ (<em>Ka</em> = 3.78 × 10³ M⁻¹), Cu²⁺ (<em>Ka</em> = 8.12 × 10⁴ M⁻¹), and Cys with the limit of detection of 72.7 nM, 140.6 nM, and 168 nM, respectively. Furthermore, <strong>ACCys</strong> successfully detected intracellular Al³⁺ ions in live-cell imaging and accurately quantified Al³⁺ levels in analytical water samples from different environmental sources. The selectivity, reversibility, and biocompatibility of <strong>ACCys</strong> make it a promising tool for real-time monitoring of Al³⁺ and Cu²⁺ in biological and environmental samples. The ability of <strong>ACCys</strong> to detect Cys with a fluorescence “turn-on” effect makes it unique and highly applicable for detecting multiple analytes with high selectivity and sensitivity.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"471 ","pages":"Article 116704"},"PeriodicalIF":4.7,"publicationDate":"2025-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144908244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficient reductive debromination of 2,2′,4,4′-tetrabromodiphenyl ether on nano-Pd-decorated ZnIn₂S₄ photocatalyst","authors":"Yuanyuan Wang ,&nbsp;Yuxin Zhang ,&nbsp;Xuemin Hu ,&nbsp;Weiwei Shao ,&nbsp;Lang Du ,&nbsp;Hangmin Guan ,&nbsp;Runhua Qin ,&nbsp;Yingfei Hu ,&nbsp;Peng Zhou","doi":"10.1016/j.jphotochem.2025.116711","DOIUrl":"10.1016/j.jphotochem.2025.116711","url":null,"abstract":"<div><div>Polybrominated diphenyl ethers (PBDEs) represent a significant category of persistent organic pollutants (POPs) that are garnering increasing attention due to their environmental impact. This investigation details the efficient degradation of 2,2′,4,4′-tetrabromodiphenyl ether (BDE-47) facilitated by nano-Pd-modified ZnIn₂S₄ microspheres. At an optimal palladium loading of 0.1 %, BDE-47 exhibited an outstanding degradation efficiency of 99 % and the fastest reaction rate of 2.252 h⁻¹ within 3 h under visible light irradiation (λ &gt; 420 nm) using methanol as the solvent and N,N-diisopropylethylamine as the hole-sacrificing agent. The nano-Pd modification significantly enhanced the migration of photogenerated carriers in ZnIn₂S₄, thereby improving the removal efficiency of BDE-47. The degradation pathway of BDE-47 involved stepwise debromination, with photo-generated electrons serving as the primary active species responsible for initiating the reductive debromination process. The BDE-47 reduction predominantly yielded 2,4,4′-tribromodiphenyl ether (BDE-28). Density functional theory calculation indicates that nano Pd interacts with the C<img>Br bond in BDE-47, particularly the ortho-C-Br bond, which exhibits a stronger affinity for nano Pd compared to the C<img>Br bond in the para-position. This is a key factor contributing to the efficient and priority removal of bromine atoms in the ortho-position. This study underscores the promising potential of Pd/ZnIn₂S₄ composites in the photocatalytic removal of halogenated environmental contaminants.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"471 ","pages":"Article 116711"},"PeriodicalIF":4.7,"publicationDate":"2025-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144892199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Smartphone-assisted colorimetric detection of phosphate ion based on CeFe bi-metal-organic framework nanozyme","authors":"Feng Zhao,&nbsp;Zhenhui Yue,&nbsp;Zhen Lei","doi":"10.1016/j.jphotochem.2025.116713","DOIUrl":"10.1016/j.jphotochem.2025.116713","url":null,"abstract":"<div><div>Phosphate ion (Pi) is a critical indicator for eutrophication of environmental water, and it is important to develop sensitive and accurate method for Pi detection. In this work, a signal-off colorimetric sensor for Pi detection was developed based on Ce<img>Fe bi-metal-organic framework nanozyme (MIL-88A_Ce/Fe NPs). The MIL-88A_Ce/Fe NPs were simply synthesized at room temperature, and exhibited peroxidase (POD)-like, oxidase-like, superoxide dismutase-like and phosphatase-like activity. The synergistic effect of Ce³⁺/Ce⁴⁺ and Fe²⁺/Fe³⁺ redox pairs endowed MIL-88A_Ce/Fe NPs with higher POD-like activity. The specific activity was calculated to be 2.246 U mg⁻¹. The catalytic mechanism was ascribed to nanozyme-promoted generation of hydroxyl radical. The POD-mimicking activity followed Michaelis-Menten kinetics. The Michaelis constant (K_m) and maximum velocity (V_max) were 0.2788 mM and 10.88 × 10⁻⁸ M s⁻¹ for TMB, while 0.4598 mM and 12.07 × 10⁻⁸ M s⁻¹ for H₂O₂. MIL-88A_Ce/Fe NPs retained 85 % of catalytic activity after stored for 65 days, showing high stability. The Ce species in MIL-88A_Ce/Fe NPs served as the recognition sites for Pi, and the interaction with Pi inhibited the POD-like activity of MIL-88A_Ce/Fe NPs. Thus, a signal-off colorimetric assay for Pi detection was proposed. The method exhibited low detection limit, short assay time, good selectivity and strong anti-interference ability. By proceeding the sensing system on test paper, a smartphone-assisted portable colorimetric platform was constructed to achieve on-site detection. Moreover, the method was used to determine Pi in real water samples, good recoveries (99.27 %-102.86 %) and low relative standard deviations (≤4.64 %) were obtained, showing great potential for environment monitoring.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"471 ","pages":"Article 116713"},"PeriodicalIF":4.7,"publicationDate":"2025-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144895996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}