Journal of Photochemistry and Photobiology A-chemistry最新文献_第4页

Intramolecular through-space conjugation of chiral C2-spirooxindole

IF 4.1 3区化学

Journal of Photochemistry and Photobiology A-chemistry Pub Date : 2025-01-29 DOI: 10.1016/j.jphotochem.2025.116316

Kosuke Nakashima , Aoi Imamura , Yasuyuki Matsushima , Shin-ichi Hirashima , Dancho Yordanov , Tsuyoshi Miura , Anton Georgiev

{"title":"Intramolecular through-space conjugation of chiral C2-spirooxindole","authors":"Kosuke Nakashima , Aoi Imamura , Yasuyuki Matsushima , Shin-ichi Hirashima , Dancho Yordanov , Tsuyoshi Miura , Anton Georgiev","doi":"10.1016/j.jphotochem.2025.116316","DOIUrl":"10.1016/j.jphotochem.2025.116316","url":null,"abstract":"<div><div>Chiral and non-conjugated C2-spirooxindole substituted at the C3 position by a phenyl ring has been studied for its unusual photoluminescence behaviour. The spectral results showed positive solvatochromism in absorption and visible emission with large Stokes shifts up to 5000 cm<sup>−1</sup> and good quantum yield. The C3-phenyl ring was found to play a central role in the unusual visible emission, allowing rotation through a single bond. Ground-state and excited-state DFT calculations revealed that the twisted phenyl plays a crucial role in the orbital interaction through space. Experiments with binary mixtures of MeCN/H<sub>2</sub>O (v/v %), which are usually associated with aggregate formation and restriction of molecular rotation, clearly showed a gradual decrease in emission with increasing water fraction. Therefore, the excited state rotation of the phenyl ring is the key factor for the observed visible emission, and the quenched emission in the binary mixture of MeCN/H<sub>2</sub>O is a result of the restricted rotation, which is incapable of effective through-space conjugation.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"463 ","pages":"Article 116316"},"PeriodicalIF":4.1,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142533","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}

引用次数: 0

Modification of anionic cyanine dyes and application in cysteine detection

IF 4.1 3区化学

Journal of Photochemistry and Photobiology A-chemistry Pub Date : 2025-01-29 DOI: 10.1016/j.jphotochem.2024.116250

Chen Luo , Huijin Lin , Huihui Cai , Chaobiao Huang

{"title":"Modification of anionic cyanine dyes and application in cysteine detection","authors":"Chen Luo , Huijin Lin , Huihui Cai , Chaobiao Huang","doi":"10.1016/j.jphotochem.2024.116250","DOIUrl":"10.1016/j.jphotochem.2024.116250","url":null,"abstract":"<div><div>Anionic cyanine is an organic fluorescent dye with excellent optical properties. Compared to cationic cyanine, anionic cyanine has been less studied and applied due to the lack of modification sites. However, when the cyclohexene ring in the anionic cyanine skeleton is replaced by a tetrahydropyridine ring, the modification site will be added, forming a novel cyanine dye AHC-N-R with NIR emission. Photophysical properties show that this anionic cyanine retains the excellent optical properties of conventional cyanine and is expected to adjust the fluorescence emission by changing the substituent groups. Acrylates were introduced in this dye to synthesize the cysteine fluorescent probe AHC-NBn-AE. The amino and sulfhydryl groups in cysteine condense with acrylate to form 1,4-thiazepane analogs and release fluorophores AHC-NBn-OH, restoring fluorescence at 650 nm. The fluorescence recovery of the probe was linearly related to the concentration of cysteine for 0.3–50.0 μmol/L. The detection limit was 0.1 μmol/L (S/N = 3, n = 9). There was almost no interference with DL-homocysteine, glutathione and several common amino acids to cysteine. The cysteine content of the L-cysteine capsule was successfully tested. The recovery rate was 94.4 %–101.5 %.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"464 ","pages":"Article 116250"},"PeriodicalIF":4.1,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387795","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}

引用次数: 0

Facile strategy toward smart nanocomposite glass nanofiber-reinforced polysiloxane adhesives with superhydrophobic and photoluminescence properties

IF 4.1 3区化学

Journal of Photochemistry and Photobiology A-chemistry Pub Date : 2025-01-29 DOI: 10.1016/j.jphotochem.2025.116318

Hany M. Abd El-Lateef , Mai M. Khalaf , Manal F. Abou Taleb , Ahmed Mohajja Alshammari , Mohamed Gouda

{"title":"Facile strategy toward smart nanocomposite glass nanofiber-reinforced polysiloxane adhesives with superhydrophobic and photoluminescence properties","authors":"Hany M. Abd El-Lateef , Mai M. Khalaf , Manal F. Abou Taleb , Ahmed Mohajja Alshammari , Mohamed Gouda","doi":"10.1016/j.jphotochem.2025.116318","DOIUrl":"10.1016/j.jphotochem.2025.116318","url":null,"abstract":"<div><div>Smart adhesive was developed toward a simple preparation of photoluminescent and water-resistant products. The formulated adhesive persisted to emit light for up to 90 min after the lighting source was switched off. Rare-earth aluminate (SrAl<sub>2</sub>O<sub>4</sub>:Eu<sup>2+</sup>,Dy<sup>3+</sup>; SAO) nanoparticles (5–12 nm) and glass nanofibers (GNF) were distributed in liquid volcanized silicone rubber (VSR; polysiloxane) to produce a nanocomposite adhesive. Electrospun glass nanofibers (GNF) were used as a reinforcement agent, displaying diameters of 50–125 nm. SAO was evenly distributed without agglomeration in the polysiloxane matrix by using nanoparticles, allowing the resultant nanocomposite adhesive to be transparent. The applied adhesives exhibited an emission band at 519 nm when excited at 365 nm. According to the SAO concentration, the photoluminescence spectra exhibited either fluorescence or afterglow emission. Photochromism was observed transitioning from translucent to green under an ultraviolet source and yellowish-green in a dark room. The developed adhesives showed scratch and water resistance owing to the incorporation of SAO nanoparticles (NPs) into the polysiloxane matrix. The SAO@VSR nanocomposite exhibited significant durability and photostability. This study demonstrated the viability of industrial production of intelligent adhesives for various uses, such as safety signs and smart windows.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"463 ","pages":"Article 116318"},"PeriodicalIF":4.1,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142532","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}

引用次数: 0

Enhanced g-C3N4 photocatalytic removal of tetracycline under visible light: Synergistic effect of N vacancies and Ni, Zr co-doping

IF 4.1 3区化学

Journal of Photochemistry and Photobiology A-chemistry Pub Date : 2025-01-28 DOI: 10.1016/j.jphotochem.2025.116308

Peng Wang , Haitao Ren , Xinheng Yu , Jianmin Luo , Bin Liu , Abdukader Abdukayum

{"title":"Enhanced g-C3N4 photocatalytic removal of tetracycline under visible light: Synergistic effect of N vacancies and Ni, Zr co-doping","authors":"Peng Wang , Haitao Ren , Xinheng Yu , Jianmin Luo , Bin Liu , Abdukader Abdukayum","doi":"10.1016/j.jphotochem.2025.116308","DOIUrl":"10.1016/j.jphotochem.2025.116308","url":null,"abstract":"<div><div>Inhibiting the recombination of photo-generated charge carriers is crucial for improving the photocatalytic performance of materials. In this study, we ingeniously proposed a Ni, Zr co-doped graphite carbon nitride catalyst (CNNZ-x) with rich N vacancies (Vs). The analysis of the system shows that Ni, Zr co-doping and N Vs provide multiple channels for electron transfer, greatly promoting the efficient separation of photogenerated charges, promoting the generation of active species, and accelerating the degradation of TC. As a result, the optimized CNNZ1.2 almost completely removes TC within 30 min under visible light (λ ≥ 420 nm), with a corresponding first-order rate constant (<em>k</em>) of 0.2097 min<sup>−1</sup>, which is 9.71 times higher than pure CN (<em>k</em> = 0.0216 min<sup>−1</sup>). This TC removal performance is significantly higher than other CN-based photocatalysts reported in the literature. Furthermore, the CNNZ1.2 exhibits good cycling stability and adaptability under real-water conditions. The intermediates and three removal pathways of TC were analyzed by LC-MS and Fukui function. The <em>E. coli</em> culture experiment showed that the TC solution treated with CNNZ1.2 photocatalysis is almost non-toxic and does not cause secondary pollution to the water environment. These findings provide new insights into the design of CN-based photocatalysts and their efficient purification of antibiotic pollutants.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"464 ","pages":"Article 116308"},"PeriodicalIF":4.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143157978","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}

引用次数: 0

Effect of Mg0.71Zn0.29O electron transport layer on violet/blue emission of CsPbCl3 LED

IF 4.1 3区化学

Journal of Photochemistry and Photobiology A-chemistry Pub Date : 2025-01-28 DOI: 10.1016/j.jphotochem.2025.116309

Weifang Zhang, Shenwei Wang, Zhengmao Wen, Qingxue Zhao, Lixin Yi

{"title":"Effect of Mg0.71Zn0.29O electron transport layer on violet/blue emission of CsPbCl3 LED","authors":"Weifang Zhang, Shenwei Wang, Zhengmao Wen, Qingxue Zhao, Lixin Yi","doi":"10.1016/j.jphotochem.2025.116309","DOIUrl":"10.1016/j.jphotochem.2025.116309","url":null,"abstract":"<div><div>In this study, the electron transport layer Mg<sub>0.71</sub>Zn<sub>0.29</sub>O was deposited using magnetron sputtering in a violet/blue CsPbCl<sub>3</sub> light-emitting diode (LED) device. Apart from facilitating electron transfer, a crucial aspect was hole blocking. The high crystallinity of Mg<sub>0.71</sub>Zn<sub>0.29</sub>O not only maintained the grain size of CsPbCl<sub>3</sub> films but also enhanced their crystalline quality. The crystal quality of the luminescent layer played a vital role in the performance of the subsequent devices. The valence band top and conduction band bottom energies of Mg<sub>0.71</sub>Zn<sub>0.29</sub>O were determined to be −9.87 eV and −4.45 eV respectively, which matched with the luminescent layer energy level. Energy level matching is the key to manufacturing efficient LED. Ultimately, an optimal thickness of 9 nm for Mg<sub>0.71</sub>Zn<sub>0.29</sub>O resulted in the highest electroluminescence (EL) intensity at a driving voltage of 8 V. Devices incorporating Mg<sub>0.71</sub>Zn<sub>0.29</sub>O exhibited significantly enhanced EL compared to those without it. This improvement was attributed to the effective inhibition of hole injection into the electron transport layer by the lower valence band level of Mg<sub>0.71</sub>Zn<sub>0.29</sub>O, thereby increasing carrier recombination likelihood. The violet/blue EL spectrum position of the device was 409 nm, the full width at half maximum was only 9.7 nm, and it had excellent luminescence monochromaticity.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"463 ","pages":"Article 116309"},"PeriodicalIF":4.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142930","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}

引用次数: 0

A near-infrared-activatable polyvinyl alcohol/chitosan composite hydrogel for efficient synergistic bacteria-killing

IF 4.1 3区化学

Journal of Photochemistry and Photobiology A-chemistry Pub Date : 2025-01-28 DOI: 10.1016/j.jphotochem.2025.116310

Jinzhao Shu , Zhiguo Hou , Yuqi Zhang , Xueyi Dong , Yue Zhang , Qiangwei Liu , Shijun Kang , Mingliang Liu , Sen Wang , Bin Yang , Jiasheng Qian

{"title":"A near-infrared-activatable polyvinyl alcohol/chitosan composite hydrogel for efficient synergistic bacteria-killing","authors":"Jinzhao Shu , Zhiguo Hou , Yuqi Zhang , Xueyi Dong , Yue Zhang , Qiangwei Liu , Shijun Kang , Mingliang Liu , Sen Wang , Bin Yang , Jiasheng Qian","doi":"10.1016/j.jphotochem.2025.116310","DOIUrl":"10.1016/j.jphotochem.2025.116310","url":null,"abstract":"<div><div>In this paper, PVA/CS/CuS-based antibacterial hydrogel was prepared by a simple method. The CuS-based particles were characterized using zeta potentiometers, X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, and scanning electron microscopy. These analyses verified the successful synthesis of CuS@PDA and CuS@PDA@Ag particles. The composite hydrogel exhibited good photothermal effect and antibacterial activity, with silver doping significantly improving its photocatalytic performance. Under 808 nm near-infrared light irradiation, the hydrogel exhibited excellent photothermal conversion ability, with the maximum temperatures of the three hydrogels being 59.2 °C, 61.5 °C, and 64.8 °C, respectively. After 10-minute irradiation, the composite hydrogel exhibited obvious antibacterial activity due to the synergistic effect of hyperthermia and reactive oxygen species, resulting in a bactericidal efficiency of 96.2 % against <em>E. coli</em> and 98.4 % against <em>S. aureus.</em></div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"463 ","pages":"Article 116310"},"PeriodicalIF":4.1,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142539","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}

引用次数: 0

Ce2O3 and TiO2 p-n heterojunction for enhanced degradation of p-nitrophenol under visible light

IF 4.1 3区化学

Journal of Photochemistry and Photobiology A-chemistry Pub Date : 2025-01-27 DOI: 10.1016/j.jphotochem.2025.116284

Antoine Farcy , Maxine Mathy , Louise Lejeune , Pierre Eloy , Sophie Hermans , Patrick Drogui , Julien G. Mahy

{"title":"Ce2O3 and TiO2 p-n heterojunction for enhanced degradation of p-nitrophenol under visible light","authors":"Antoine Farcy , Maxine Mathy , Louise Lejeune , Pierre Eloy , Sophie Hermans , Patrick Drogui , Julien G. Mahy","doi":"10.1016/j.jphotochem.2025.116284","DOIUrl":"10.1016/j.jphotochem.2025.116284","url":null,"abstract":"<div><div>A sol–gel method is used to synthesize TiO<sub>2</sub>, using few organic products. In order to increase the photocatalytic activity in the near visible range (395 nm), cerium is used as a dopant at various concentrations ranging from 0.03 mol% to 4.40 mol%. The addition of cerium leads to the formation of p-n heterojunctions between Ce<sub>2</sub>O<sub>3</sub> and TiO<sub>2</sub>, multiplying by 2 (under UV–visible light) or 2.6 (under visible light) the photocatalytic efficiency of the composite material with the best dopant amount, i.e. 0.06 mol% of cerium. X-ray diffraction showed the formation of TiO<sub>2</sub> in its anatase form, while nitrogen adsorption/desorption isotherms showed changes in specific surface area as a function of the percentage of cerium added. The presence of cerium (III) in the sample is confirmed by XPS and the amount is determined quantitatively by ICP. DRUS analysis highlights the difference in bandgap caused by the Ce<sub>2</sub>O<sub>3</sub> incorporated into the sample. In order to compare the different photocatalysts obtained, the degradation of p-nitrophenol is tested in their presence in water under UV light as well as a wavelength close to the visible range, i.e. 395 nm. Finally, based on the results obtained by electron paramagnetic resonance, a photoactivation mechanism of the mixed oxide is proposed.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"463 ","pages":"Article 116284"},"PeriodicalIF":4.1,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142932","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}

引用次数: 0

Photoluminescent property, mechanistic and crystallographic studies on novel (Z)-5,6-dihydrodibenzo[b,f]azocine AIEgens

IF 4.1 3区化学

Journal of Photochemistry and Photobiology A-chemistry Pub Date : 2025-01-27 DOI: 10.1016/j.jphotochem.2025.116293

Wen-Chao Xiong , Yan-Xue Li , Hao-Yuan Zhang , Shan-Shan Gong , Shouzhi Pu , Rongwei Shi , Qi Sun

{"title":"Photoluminescent property, mechanistic and crystallographic studies on novel (Z)-5,6-dihydrodibenzo[b,f]azocine AIEgens","authors":"Wen-Chao Xiong , Yan-Xue Li , Hao-Yuan Zhang , Shan-Shan Gong , Shouzhi Pu , Rongwei Shi , Qi Sun","doi":"10.1016/j.jphotochem.2025.116293","DOIUrl":"10.1016/j.jphotochem.2025.116293","url":null,"abstract":"<div><div>A series of four novel (<em>Z</em>)-5,6-dihydrodibenzo[<em>b</em>,<em>f</em>]azocine AIEgens (<strong>DHDBA-1</strong>–<strong>4</strong>) featuring a flexible non-aromatic eight-membered ring fused with two rigid aromatic rings were designed and synthesized. All of these π-conjugated polycyclics exhibited typical AIE properties with excellent solid-state fluorescence quantum yields ranging from 33.2 % to 67.6 %. Theoretical calculations revealed that <strong>DHDBA-1</strong>–<strong>4</strong> adopt a unique tub conformation in solutions and their excitations have both locally excited (LE) and charge transfer (CT) characters. As exemplified by <strong>DHDBA-1</strong>, the low molar absorption coefficient and energetically accessible S<sub>0</sub>/S<sub>1</sub> minimum energy conical intersection (MECI) were identified as the two major causes for the poor photoluminescent properties of DHDBA compounds in solution phase. In solid state, DHDBA compounds was found to adopt more planar conformations. The more effective excitation and prohibition of structural deformation that leads to S<sub>0</sub>/S<sub>1</sub> surface crossing open the radiative decay channel. Crystallographic analysis illustrated that the flexibility of the central dihydroazocine core enables the DHDBA compounds to exist in multiple conformations in crystal lattice. The absence of π–π stacking and presence of abundant weak intermolecular interactions in the single crystals well explain their high solid-state fluorescence quantum yields.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"463 ","pages":"Article 116293"},"PeriodicalIF":4.1,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142925","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}

引用次数: 0

A sensitive colorimetric and “OFF-ON” fluorescent sensor for cyanide ions based on ESIPT-AIE mechanism from a fluorene-hydroxybenzaldehyde Schiff base

IF 4.1 3区化学

Journal of Photochemistry and Photobiology A-chemistry Pub Date : 2025-01-27 DOI: 10.1016/j.jphotochem.2025.116295

Hossein Reza Darabi, Amin Ghaemi, Kioumars Aghapoor, Farshid Mohsenzadeh, Hani Sayahi, Ramo Nazarian

{"title":"A sensitive colorimetric and “OFF-ON” fluorescent sensor for cyanide ions based on ESIPT-AIE mechanism from a fluorene-hydroxybenzaldehyde Schiff base","authors":"Hossein Reza Darabi, Amin Ghaemi, Kioumars Aghapoor, Farshid Mohsenzadeh, Hani Sayahi, Ramo Nazarian","doi":"10.1016/j.jphotochem.2025.116295","DOIUrl":"10.1016/j.jphotochem.2025.116295","url":null,"abstract":"<div><div>(E)-2-(((9H-Fluoren-2-yl)imino)methyl)phenol (<strong>FIP</strong>) is an <em>ortho</em>-hydroxy aromatic imine Schiff base that exhibits intramolecular hydrogen bonding. Its spectral characteristics, including absorption and fluorescence, were analyzed in solvents of varying polarities. <strong>FIP</strong> exhibited selective recognition of cyanide ions (CN<sup>−</sup>) in a DMF/H<sub>2</sub>O buffer (7:3) at pH 7, showing significant changes in both absorption and “OFF-ON” fluorescent emission in the presence of competing anions. <sup>1</sup>H NMR and FT-IR studies indicate that the interaction with CN<sup>−</sup> and OH<sup>−</sup> involves a deprotonation process, leading to the formation of the keto tautomer of <strong>FIP</strong>, which plays a crucial role in the OFF-ON emission response: the ESIPT-ICT process is activated by OH<sup>−</sup>, while the ESIPT-AIE process is triggered by CN<sup>−</sup>. Notably, <strong>FIP</strong> exhibits high sensitivity for CN<sup>−</sup> in fluorescent detection, with a limit of detection (LOD) of 6.5 nM, significantly lower than the absorbance detection (LOD = 97 nM). The sensor’s key attributes include selectivity, rapid response time, a large Stokes shift, and the ability to monitor CN<sup>−</sup> levels in tap water, making it a user-friendly option for on-site applications.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"463 ","pages":"Article 116295"},"PeriodicalIF":4.1,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142931","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}

引用次数: 0

Highly efficient photocatalytic inactivation of flowing bioaerosol by using visible light-assisted titanium-based composite: Application and mechanism

IF 4.1 3区化学

Journal of Photochemistry and Photobiology A-chemistry Pub Date : 2025-01-25 DOI: 10.1016/j.jphotochem.2025.116287

Xiaoxuan Liu , Dafei Yu , Yujun Wang , Na Li , Kuo Wang , Yingnan Yang , Na Liu

{"title":"Highly efficient photocatalytic inactivation of flowing bioaerosol by using visible light-assisted titanium-based composite: Application and mechanism","authors":"Xiaoxuan Liu , Dafei Yu , Yujun Wang , Na Li , Kuo Wang , Yingnan Yang , Na Liu","doi":"10.1016/j.jphotochem.2025.116287","DOIUrl":"10.1016/j.jphotochem.2025.116287","url":null,"abstract":"<div><div>Some pathogenic microorganisms can survive and spread as bioaerosols which is a serious threat to human health. Hence, a visible light-assisted photocatalytic inactivation system for bioaerosol inactivation was constructed based on the novel P/Ag/Ag<sub>2</sub>O/Ag<sub>3</sub>PO<sub>4</sub>/TiO<sub>2</sub> (PAgT) composite photocatalyst. The highest inactivation efficiency for 10<sup>8</sup> CFU/m<sup>3</sup> <em>Escherichia coli</em> bioaerosol could reach 99.3 % within just 14.1 s under visible light irradiation. The effect of various operational conditions on photocatalytic inactivation efficiency were investigated, including light intensity, bioaerosol concentration and residence time. Furthermore, during the bioaerosol inactivation process, the changes of cell morphology and intracellular reactive oxygen species were clarified. The oxidizing substances h<sup>+</sup>, <img>O<sub>2</sub><sup>−</sup> and <img>OH produced on the surface of the photocatalyst under the irradiation of visible light were the direct cause of cell oxidizing damage. It disrupted cell membrane permeability and cause an increase in intracellular reactive oxygen species, ultimately leading to cell death. The system possessed an irreversible and efficient photocatalytic bioaerosol sterilization ability toward different airborne pathogenic bacteria, including Gram-positive and Gram-negative bacteria. In addition, the PAgT photocatalytic system demonstrated good cyclability and stability for bioaerosol inactivation, providing a promising strategy to reduce the airborne pathogenic microbial contamination, especially for indoor or occupied space.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"463 ","pages":"Article 116287"},"PeriodicalIF":4.1,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142536","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}

引用次数: 0