Pub Date : 2024-10-24DOI: 10.1016/j.jphotochem.2024.116054
Yingzi Lin , Mengshi Wang , Junjie Chen , Siwen Li , Yuanyuan Zhang , Liangliang Wei , Ningning Sun , Chengyu Liu , Junjie Zhao
Based on the deficiency of the Fe2+ catalyzed persulfate (PDS) process, ultraviolet (UV) synergistic Fe2+ activated PDS system was introduced in this study for the degradation of acid orange 7 (AO7) dye. The effects of different initial pH, PDS dosage, Fe2+ dosage, and different UV intensities on the degradation rate of AO7 were investigated, and a kinetic model for the apparent reaction rate was determined. The results showed that the UV/Fe2+/PDS system was effective in degrading AO7 in a wide pH range. Under optimal conditions, 96 % removal of AO7 was achieved in 10 min. The effects of different inorganic anions on AO7 were discussed; Cl− had little effect on the degradation effect, and SO42−, NO3− and HCO3− inhibited the degradation of AO7 by the system to varying degrees. The presence of reactive radicals (SO4·− and·OH) in the reaction was determined by quenching experiments and EPR capture and their degradation contribution was further investigated. Nine intermediates of AO7 were detected by LC-MS/MS, and the degradation pathway of AO7 was inferred by combining with UV-Vis spectra. Finally, the ecotoxicity and tritogenic effects of AO7 intermediates were assessed by Toxtree and T.E.S.T toxicity prediction models, which showed that the final degradation product toxicity was non-mutagenic, non-teratogenic, and devoid of hereditary and non-hereditary carcinogenicity.
{"title":"UV-enhanced Fe2+/PDS system for degradation of acid orange 7: Kinetics, degradation mechanism and toxicity assessment","authors":"Yingzi Lin , Mengshi Wang , Junjie Chen , Siwen Li , Yuanyuan Zhang , Liangliang Wei , Ningning Sun , Chengyu Liu , Junjie Zhao","doi":"10.1016/j.jphotochem.2024.116054","DOIUrl":"10.1016/j.jphotochem.2024.116054","url":null,"abstract":"<div><div>Based on the deficiency of the Fe<sup>2+</sup> catalyzed persulfate (PDS) process, ultraviolet (UV) synergistic Fe<sup>2+</sup> activated PDS system was introduced in this study for the degradation of acid orange 7 (AO7) dye. The effects of different initial pH, PDS dosage, Fe<sup>2+</sup> dosage, and different UV intensities on the degradation rate of AO7 were investigated, and a kinetic model for the apparent reaction rate was determined. The results showed that the UV/Fe<sup>2+</sup>/PDS system was effective in degrading AO7 in a wide pH range. Under optimal conditions, 96 % removal of AO7 was achieved in 10 min. The effects of different inorganic anions on AO7 were discussed; Cl<sup>−</sup> had little effect on the degradation effect, and SO<sub>4</sub><sup>2−</sup>, NO<sub>3</sub><sup>−</sup> and HCO<sub>3</sub><sup>−</sup> inhibited the degradation of AO7 by the system to varying degrees. The presence of reactive radicals (SO<sub>4</sub><sup>·−</sup> and·OH) in the reaction was determined by quenching experiments and EPR capture and their degradation contribution was further investigated. Nine intermediates of AO7 were detected by LC-MS/MS, and the degradation pathway of AO7 was inferred by combining with UV-Vis spectra. Finally, the ecotoxicity and tritogenic effects of AO7 intermediates were assessed by Toxtree and T.E.S.T toxicity prediction models, which showed that the final degradation product toxicity was non-mutagenic, non-teratogenic, and devoid of hereditary and non-hereditary carcinogenicity.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"460 ","pages":"Article 116054"},"PeriodicalIF":4.1,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663341","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}
Pub Date : 2024-10-22DOI: 10.1016/j.jphotochem.2024.116102
Yuanyuan Yao , Jiang Yuan , Zhaochen Wang , Yanwei Zhao , Jiameng Xu , Mo Liu , Jounghyung Cho , Fuqiang Li
Formaldehyde (HCHO) severely degrades indoor air quality, and conventional remediation methods are often inadequate for addressing low concentrations of HCHO indoors. In this study, we synthesized a MIL-68(In)-NH2/graphene oxide (GO) composite using a solvothermal method, aimed specifically at enhancing the photocatalytic degradation of HCHO under visible light. Our results show that the integration of GO enhances visible light absorption and facilitates efficient electron transport, significantly improving photocatalytic performance. The MIL-68(In)-NH2/GO composite achieves a 77 % degradation rate of HCHO, significantly outperforming MIL-68(In)-NH2 (51 %) and GO (22 %) alone. This enhanced activity is attributed to the effective separation of electron-hole pairs and synergistic interactions within the composite. We proposed an enhanced photocatalytic mechanism for the MIL-68(In)-NH2/GO system, identifying h+ and •O2– as the principal active species. Moreover, the MIL-68(In)-NH2/GO composite shows excellent reusability and stability, making it a promising candidate for eco-friendly and efficient indoor air purification using metal–organic frameworks.
{"title":"Efficient visible-light-driven photocatalytic degradation of indoor formaldehyde using an indium-based MOF/graphene oxide composite","authors":"Yuanyuan Yao , Jiang Yuan , Zhaochen Wang , Yanwei Zhao , Jiameng Xu , Mo Liu , Jounghyung Cho , Fuqiang Li","doi":"10.1016/j.jphotochem.2024.116102","DOIUrl":"10.1016/j.jphotochem.2024.116102","url":null,"abstract":"<div><div>Formaldehyde (HCHO) severely degrades indoor air quality, and conventional remediation methods are often inadequate for addressing low concentrations of HCHO indoors. In this study, we synthesized a MIL-68(In)-NH<sub>2</sub>/graphene oxide (GO) composite using a solvothermal method, aimed specifically at enhancing the photocatalytic degradation of HCHO under visible light. Our results show that the integration of GO enhances visible light absorption and facilitates efficient electron transport, significantly improving photocatalytic performance. The MIL-68(In)-NH<sub>2</sub>/GO composite achieves a 77 % degradation rate of HCHO, significantly outperforming MIL-68(In)-NH<sub>2</sub> (51 %) and GO (22 %) alone. This enhanced activity is attributed to the effective separation of electron-hole pairs and synergistic interactions within the composite. We proposed an enhanced photocatalytic mechanism for the MIL-68(In)-NH<sub>2</sub>/GO system, identifying h<sup>+</sup> and •O<sub>2</sub><sup>–</sup> as the principal active species. Moreover, the MIL-68(In)-NH<sub>2</sub>/GO composite shows excellent reusability and stability, making it a promising candidate for eco-friendly and efficient indoor air purification using metal–organic frameworks.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"460 ","pages":"Article 116102"},"PeriodicalIF":4.1,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142663344","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}
Pub Date : 2024-10-22DOI: 10.1016/j.jphotochem.2024.116112
Bruna M. Rodrigues , Carlos C. Diniz , Mateus H. Köhler , Otávio A. Chaves , Bernardo A. Iglesias
In this study, it was evaluated the photophysical, electrochemical, photobiological, and DNA/BSA-binding properties of fluorenyl corrole derivatives H3MFluCor and H3TFluCor. Absorption and emission analyses were corroborated by theoretical calculations performed using time-dependent density functional theory, which revealed natural transition orbitals densities concentrated around the tetrapyrrolic macrocycle in all cases. The experimental studies indicated that the corroles H3MFluCor and H3TFluCor are stable in solution and exhibited photostability primarily in DMSO(5%)/Tris-HCl (pH 7.4) buffer. The generation of reactive oxygen species (ROS) and log POW values highlight their potential application in photobiological methods, as these corroles effectively generate ROS with more lipophilic characteristics. Furthermore, their binding capacity towards double-stranded DNA and bovine serum albumin (BSA) was also evaluated by spectroscopic techniques and molecular docking calculations. The interactive profile with biomolecules indicates that the corrole derivatives H3MFluCor and H3TFluCor tend to binding into the minor grooves of DNA through secondary forces, which are particularly pronounced at site III of the BSA, likely due to the static interactions.
本研究评估了芴基珊瑚衍生物 H3MFluCor 和 H3TFluCor 的光物理、电化学、光生物学和 DNA/BSA 结合特性。 利用随时间变化的密度泛函理论进行的理论计算证实了吸收和发射分析，计算显示所有情况下自然过渡轨道密度都集中在四吡咯大环周围。实验研究表明，腐蚀物 H3MFluCor 和 H3TFluCor 在溶液中是稳定的，主要在 DMSO（5%）/三羟基乙酸（pH 7.4）缓冲液中表现出光稳定性。活性氧（ROS）的生成和对数 POW 值突显了它们在光生物方法中的潜在应用，因为这些腐蚀剂能有效生成具有更亲脂特性的 ROS。此外，还通过光谱技术和分子对接计算评估了它们与双链 DNA 和牛血清白蛋白（BSA）的结合能力。与生物大分子的相互作用曲线表明，珊瑚虫衍生物 H3MFluCor 和 H3TFluCor 倾向于通过次级作用力结合到 DNA 的次要沟槽中，在 BSA 的位点 III 尤为明显，这可能是由于静态相互作用的缘故。
{"title":"Fluorenyl-corroles: Characterization, photophysical, photobiological, and DNA/BSA-binding properties of novel examples","authors":"Bruna M. Rodrigues , Carlos C. Diniz , Mateus H. Köhler , Otávio A. Chaves , Bernardo A. Iglesias","doi":"10.1016/j.jphotochem.2024.116112","DOIUrl":"10.1016/j.jphotochem.2024.116112","url":null,"abstract":"<div><div>In this study, it was evaluated the photophysical, electrochemical, photobiological, and DNA/BSA-binding properties of fluorenyl corrole derivatives <strong>H<sub>3</sub>MFluCor</strong> and <strong>H<sub>3</sub>TFluCor</strong>. Absorption and emission analyses were corroborated by theoretical calculations performed using time-dependent density functional theory, which revealed natural transition orbitals densities concentrated around the tetrapyrrolic macrocycle in all cases. The experimental studies indicated that the corroles <strong>H<sub>3</sub>MFluCor</strong> and <strong>H<sub>3</sub>TFluCor</strong> are stable in solution and exhibited photostability primarily in DMSO(5%)/Tris-HCl (pH 7.4) buffer. The generation of reactive oxygen species (ROS) and log <em>P</em><sub>OW</sub> values highlight their potential application in photobiological methods, as these corroles effectively generate ROS with more lipophilic characteristics. Furthermore, their binding capacity towards double-stranded DNA and bovine serum albumin (BSA) was also evaluated by spectroscopic techniques and molecular docking calculations. The interactive profile with biomolecules indicates that the corrole derivatives <strong>H<sub>3</sub>MFluCor</strong> and <strong>H<sub>3</sub>TFluCor</strong> tend to binding into the minor grooves of DNA through secondary forces, which are particularly pronounced at site III of the BSA, likely due to the static interactions.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"460 ","pages":"Article 116112"},"PeriodicalIF":4.1,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553282","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}
Pub Date : 2024-10-22DOI: 10.1016/j.jphotochem.2024.116110
Elena V. Fedorenko , Anatolii G. Mirochnik , Andrey V. Gerasimenko , Nikita A. Lyubykh , Anton Yu. Beloliptsev , Alexander Yu. Mayor , Anton E. Egorov , Alexey A. Kostyukov , Ivan D. Burtsev , Tuan M. Nguyen , Anna V. Shibaeva , Alina A. Markova , Vladimir A. Kuzmin
Boron β-diketonates are prospective fluorescent dyes for functional organic materials to new technologies in the fields of chemistry, NLO-optics, photonics and bio-imaging. The novel NIR-to-NIR luminophors – curcuminoids of boron difluoride with different substituents at the central carbon atom (at the γ-position) of the chelate ring 1,7-bis(4′-N,N′-dimethylaminophenyl)-4-organyl-gept-1,6-dien-3,5-dionate of boron difluoride (1–5) were synthesized. Luminescence in solutions, crystals and polymer matrices, photobiological properties and NLO properties in polystyrene (PS) and polymethylmethacrylate (PMMA) were studied. The crystal structure has been determined for 1. For 1–5, in PS film, upon excitation by laser (365 nm), two luminescence bands are observed in the blue (430 nm) and red (650–700 nm) regions of the spectrum. For 1–5, two-photon luminescence is recorded in PS and PMMA films. PS 1 films demonstrate high photostability. The synthesized dyes turned out to be almost non-toxic for HCT116 tumor cells both in a long-term dark experiment (72 h) and after photoexcitation in accordance with absorption maxima in the submicromolar concentration range. The compounds were rapidly accumulated by cells within 3 h, demonstrating cytoplasmic distribution and the potential for use as cellular photoimaging agents. The accumulation of dyes with hydrocarbon γ-substitutes (methyl, iso-propyl, phenyl) after 3 and 24 h is more effective compared to dye 2 (commercial product Cranad-2).
{"title":"Molecular design of −substituted boron difluoride curcuminoids: Tuning luminescence and nonlinear optical properties","authors":"Elena V. Fedorenko , Anatolii G. Mirochnik , Andrey V. Gerasimenko , Nikita A. Lyubykh , Anton Yu. Beloliptsev , Alexander Yu. Mayor , Anton E. Egorov , Alexey A. Kostyukov , Ivan D. Burtsev , Tuan M. Nguyen , Anna V. Shibaeva , Alina A. Markova , Vladimir A. Kuzmin","doi":"10.1016/j.jphotochem.2024.116110","DOIUrl":"10.1016/j.jphotochem.2024.116110","url":null,"abstract":"<div><div>Boron β-diketonates are prospective fluorescent dyes for functional organic materials to new technologies in the fields of chemistry, NLO-optics, photonics and bio-imaging. The novel NIR-to-NIR luminophors – curcuminoids of boron difluoride with different substituents at the central carbon atom (at the γ-position) of the chelate ring 1,7-bis(4′-N,N′-dimethylaminophenyl)-4-organyl-gept-1,6-dien-3,5-dionate of boron difluoride (<strong>1</strong>–<strong>5</strong>) were synthesized. Luminescence in solutions, crystals and polymer matrices, photobiological properties and NLO properties in polystyrene (PS) and polymethylmethacrylate (PMMA) were studied. The crystal structure has been determined for <strong>1</strong>. For <strong>1</strong>–<strong>5</strong>, in PS film, upon excitation by laser (365 nm), two luminescence bands are observed in the blue (430 nm) and red (650–700 nm) regions of the spectrum. For <strong>1</strong>–<strong>5</strong>, two-photon luminescence is recorded in PS and PMMA films. PS <strong>1</strong> films demonstrate high photostability. The synthesized dyes turned out to be almost non-toxic for HCT116 tumor cells both in a long-term dark experiment (72 h) and after photoexcitation in accordance with absorption maxima in the submicromolar concentration range. The compounds were rapidly accumulated by cells within 3 h, demonstrating cytoplasmic distribution and the potential for use as cellular photoimaging agents. The accumulation of dyes with hydrocarbon γ-substitutes (methyl, <em>iso</em>-propyl, phenyl) after 3 and 24 h is more effective compared to dye 2 (commercial product Cranad-2).</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"460 ","pages":"Article 116110"},"PeriodicalIF":4.1,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142594057","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}
The HPTS serves as a versatile tool in pH and CO2 sensing studies, as well as in cell biology studies of various processes. However, the long-term photostability of HPTS as a fluorescent dye is an important consideration in its use, especially for long-term applications. In this work, sol–gel synthesized Er3+, Tb3+ and Er3+: Tb3+ co-doped 1393 bioactive glass particles were incorporated with the HPTS in the presence of ionic liquid in an ethyl cellulose matrix. The interaction of the bioactive glasses with the HPTS was investigated by steady-state luminescence and excited-state lifetime measurements. The prepared composites showed linearizable responses when exposed to different CO2 concentrations. High I0/I100 values (87, 109 and 115) were obtained for the binary blends of HPTS and bioactive glasses. When the imidazolium-based IL was used together with the offered composites, we observed improved stability and longevity for the HPTS up to 315 days. The incorporation of imidazolium-based ionic liquids as additives in HPTS-based fluorescence assays together with the bioactive glasses holds promise for enhancing the photostability of the HPTS and improving the reliability and longevity of fluorescence signals in various research applications.
{"title":"Emission based response of Er3+, Tb3+, and Er3+-Tb3+ co-doped 1393 bioactive glasses along with HPTS towards CO2","authors":"Utku Ulucan , Sibel Oguzlar , Aylin M. Deliormanlı , Kadriye Ertekin","doi":"10.1016/j.jphotochem.2024.116107","DOIUrl":"10.1016/j.jphotochem.2024.116107","url":null,"abstract":"<div><div>The HPTS serves as a versatile tool in pH and CO2 sensing studies, as well as in cell biology studies of various processes. However, the long-term photostability of HPTS as a fluorescent dye is an important consideration in its use, especially for long-term applications. In this work, sol–gel synthesized Er<sup>3+</sup>, Tb<sup>3+</sup> and Er<sup>3+</sup>: Tb<sup>3+</sup> co-doped 1393 bioactive glass particles were incorporated with the HPTS in the presence of ionic liquid in an ethyl cellulose matrix. The interaction of the bioactive glasses with the HPTS was investigated by steady-state luminescence and excited-state lifetime measurements. The prepared composites showed linearizable responses when exposed to different CO<sub>2</sub> concentrations. High I<sub>0</sub>/I<sub>100</sub> values (87, 109 and 115) were obtained for the binary blends of HPTS and bioactive glasses. When the imidazolium-based IL was used together with the offered composites, we observed improved stability and longevity for the HPTS up to 315 days. The incorporation of imidazolium-based ionic liquids as additives in HPTS-based fluorescence assays together with the bioactive glasses holds promise for enhancing the photostability of the HPTS and improving the reliability and longevity of fluorescence signals in various research applications.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"459 ","pages":"Article 116107"},"PeriodicalIF":4.1,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539812","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}
The removal efficiencies of Acid Red 337 dye were investigated by combining advanced oxidation processes based on OH and SO4− radicals. The photocatalytic oxidation processes were carried out at the natural pH (5.4) and acidic pH (3.0) values of the dye solution. In the experiments, iron (II) sulfate (Fe2+) and potassium ferrioxalate (FeOx) were used as catalysts, hydrogen peroxide (H2O2) and peroxymonosulfate (PMS) were used as oxidants to compare dye removal efficiency and to determine the optimum doses. This comparison provided the opportunity to identify suitable catalysts and oxidants for dye removal. Furthermore, time-based comparisons were conducted from 2 to 10 min using the optimum catalyst doses. It was obtained that PMS was more effective as an oxidant in the presence of both iron catalysts for colour removal. The colour removal efficiency of 98.2 % was achieved in the PMS/Fe2+/UV process with doses of 1 mM PMS and 0.1 mM Fe2+ at pH 5.4 and an irradiation time of 10 min. In experiments using light-sensitive ferrioxalate (FeOx), colour removal was achieved in the PMS/FeOx/UV process with an efficiency of 97.8 %. Additionally, an artificial neural networks (ANNs) model effectively optimized the oxidation parameters, with predicted values closely matching the experimental data. The ANNs model yielded excellent statistical performance, with a root mean square error (RMSE) of 0.0317, 0.0223 and coefficient of determination (R2) of 0.9690 and 0.9854 for UV/Fe2+/H2O2-UV/FeOx/H2O2 and UV/Fe2+/PMS-UV/FeOx/PMS oxidation systems respectively.
{"title":"Decolorization of Acid Red 337 dye with hydroxyl and sulfate radical based advanced oxidation processes using different iron Catalyst: An experimental and statistical Investigation","authors":"Pelin Saraç Uluçtan, Handan Atalay Eroğlu, Elif Nihan Kadıoğlu, Feryal Akbal","doi":"10.1016/j.jphotochem.2024.116105","DOIUrl":"10.1016/j.jphotochem.2024.116105","url":null,"abstract":"<div><div>The removal efficiencies of Acid Red 337 dye were investigated by combining advanced oxidation processes based on <img>OH and SO<sub>4</sub><img><sup>−</sup> radicals. The photocatalytic oxidation processes were carried out at the natural pH (5.4) and acidic pH (3.0) values of the dye solution. In the experiments, iron (II) sulfate (Fe<sup>2+</sup>) and potassium ferrioxalate (FeOx) were used as catalysts, hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) and peroxymonosulfate (PMS) were used as oxidants to compare dye removal efficiency and to determine the optimum doses. This comparison provided the opportunity to identify suitable catalysts and oxidants for dye removal. Furthermore, time-based comparisons were conducted from 2 to 10 min using the optimum catalyst doses. It was obtained that PMS was more effective as an oxidant in the presence of both iron catalysts for colour removal. The colour removal efficiency of 98.2 % was achieved in the PMS/Fe<sup>2+</sup>/UV process with doses of 1 mM PMS and 0.1 mM Fe<sup>2+</sup> at pH 5.4 and an irradiation time of 10 min. In experiments using light-sensitive ferrioxalate (FeOx), colour removal was achieved in the PMS/FeOx/UV process with an efficiency of 97.8 %. Additionally, an artificial neural networks (ANNs) model effectively optimized the oxidation parameters, with predicted values closely matching the experimental data. The ANNs model yielded excellent statistical performance, with a root mean square error (RMSE) of 0.0317, 0.0223 and coefficient of determination (R<sup>2</sup>) of 0.9690 and 0.9854 for UV/Fe<sup>2+</sup>/H<sub>2</sub>O<sub>2</sub>-UV/FeOx/H<sub>2</sub>O<sub>2</sub> and UV/Fe<sup>2+</sup>/PMS-UV/FeOx/PMS oxidation systems respectively.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"459 ","pages":"Article 116105"},"PeriodicalIF":4.1,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539809","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}
Pub Date : 2024-10-20DOI: 10.1016/j.jphotochem.2024.116101
Sithembela A. Zikalala , Abera D. Ambaye , Alex T. Kuvarega , Vincent O. Nyamori , Jianxin Li , Bhekie B. Mamba , Edward N. Nxumalo
The correlation of photocatalytic efficiency of titania–amorphous (nitrogen doped) carbon nanotubes (TiO2–a(N)CNT) nanocomposites with colloidal and optoelectrical properties was investigated. TiO2–aNCNT and TiO2–aCNT exhibited narrow zeta potential variation, high polydispersity index, and large agglomerate sizes across the pH range 1–8. Despite their poor colloidal stability, TiO2–aNCNT exhibited superior degradation efficiency for high molecular weight reactive dyes, RR 120 and Remazol brilliant blue (RBB) with 55 mg.L−1 of RR 120 mineralized under solar irradiation. The photocatalytic performance for TiO2–aNCNT and TiO2–aCNT correlated with the respective energy band gaps 3.01 and 3.14 eV (respectively) and Ubarch tailing energies. Cyclic voltammetry showed a narrow peak-to-peak separation () of 200.7 V (vs Ag/AgCl) for TiO2–aNCNT thus confirming enhanced electron transfer kinetics. Electron impedance spectroscopy confirmed low charge transfer resistance for TiO2–aNCNT. Herein, it is demonstrated that optoelectrical properties are superior to colloidal stability in driving photocatalytic reactions.
{"title":"Dependence of photocatalytic efficiency of titania-carbon nanotube nanocomposites on optoelectrical properties and colloidal stability","authors":"Sithembela A. Zikalala , Abera D. Ambaye , Alex T. Kuvarega , Vincent O. Nyamori , Jianxin Li , Bhekie B. Mamba , Edward N. Nxumalo","doi":"10.1016/j.jphotochem.2024.116101","DOIUrl":"10.1016/j.jphotochem.2024.116101","url":null,"abstract":"<div><div>The correlation of photocatalytic efficiency of titania–amorphous (nitrogen doped) carbon nanotubes (TiO<sub>2</sub>–a(N)CNT) nanocomposites with colloidal and optoelectrical properties was investigated. TiO<sub>2</sub>–aNCNT and TiO<sub>2</sub>–aCNT exhibited narrow zeta potential variation, high polydispersity index, and large agglomerate sizes across the pH range 1–8. Despite their poor colloidal stability, TiO<sub>2</sub>–aNCNT exhibited superior degradation efficiency for high molecular weight reactive dyes, RR 120 and Remazol brilliant blue (RBB) with 55 mg.L<sup>−1</sup> of RR 120 mineralized under solar irradiation. The photocatalytic performance for TiO<sub>2</sub>–aNCNT and TiO<sub>2</sub>–aCNT correlated with the respective energy band gaps 3.01 and 3.14 eV (respectively) and Ubarch tailing energies. Cyclic voltammetry showed a narrow peak-to-peak separation (<span><math><mrow><mi>Δ</mi><msub><mi>E</mi><mi>p</mi></msub></mrow></math></span>) of 200.7 V (vs Ag/AgCl) for TiO<sub>2</sub>–aNCNT thus confirming enhanced electron transfer kinetics. Electron impedance spectroscopy confirmed low charge transfer resistance for TiO<sub>2</sub>–aNCNT. Herein, it is demonstrated that optoelectrical properties are superior to colloidal stability in driving photocatalytic reactions.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"460 ","pages":"Article 116101"},"PeriodicalIF":4.1,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142573178","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}
Pub Date : 2024-10-20DOI: 10.1016/j.jphotochem.2024.116106
Veronica S. Tamozhnikova , Vjacheslav P. Grivin , Yuri P. Tsentalovich , Roman Yu. Balakhonov , Igor S. Mekeda , Valerii Z. Shirinian , Evgeni M. Glebov
Heterocyclic analogues of phenanthridine are an important class of nitrogen-containing compounds with promising optical properties including high quantum yield of luminescence, high molar absorption coefficients and sensitivity to solvent medium. The luminescent properties of phenanthridine and its derivatives can be changed by introducing appropriate substituents into various positions of the phenanthridine framework. Recently developed luminescent azahelicenes of furoquinoline series demonstrate strong acidochromic effect both on absorption and emission spectra. One of the features of these compounds is the photochemical formation of a protonated form in chlorine-containing solvents under UV irradiation. In this work we perform a mechanistic study of 3-methoxy-6-(4-methoxyphenyl)naphtho[1′,2′:4,5]furo[2,3-c]quinoline (compound 1) in 1,2-dichloroethane (1,2-DCE) by means of stationary and laser flash photolysis. In addition to the triplet state formation observed in typical organic solvents photoexcitation in 1,2-DCE was found to result in an electron transfer from the excited compound 1 to a solvent molecule. Reactions of resulting intermediates lead to the formation of the protonated azahelicene. The quantitative mechanism of photoprotonation is put forward.
{"title":"Photochemical protonation of an azahelicene in 1,2-dichloroethane","authors":"Veronica S. Tamozhnikova , Vjacheslav P. Grivin , Yuri P. Tsentalovich , Roman Yu. Balakhonov , Igor S. Mekeda , Valerii Z. Shirinian , Evgeni M. Glebov","doi":"10.1016/j.jphotochem.2024.116106","DOIUrl":"10.1016/j.jphotochem.2024.116106","url":null,"abstract":"<div><div>Heterocyclic analogues of phenanthridine are an important class of nitrogen-containing compounds with promising optical properties including high quantum yield of luminescence, high molar absorption coefficients and sensitivity to solvent medium. The luminescent properties of phenanthridine and its derivatives can be changed by introducing appropriate substituents into various positions of the phenanthridine framework. Recently developed luminescent azahelicenes of furoquinoline series demonstrate strong acidochromic effect both on absorption and emission spectra. One of the features of these compounds is the photochemical formation of a protonated form in chlorine-containing solvents under UV irradiation. In this work we perform a mechanistic study of 3-methoxy-6-(4-methoxyphenyl)naphtho[1′,2′:4,5]furo[2,3-<em>c</em>]quinoline (compound <strong>1</strong>) in 1,2-dichloroethane (1,2-DCE) by means of stationary and laser flash photolysis. In addition to the triplet state formation observed in typical organic solvents photoexcitation in 1,2-DCE was found to result in an electron transfer from the excited compound <strong>1</strong> to a solvent molecule. Reactions of resulting intermediates lead to the formation of the protonated azahelicene. The quantitative mechanism of photoprotonation is put forward.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"459 ","pages":"Article 116106"},"PeriodicalIF":4.1,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539810","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}
Pub Date : 2024-10-20DOI: 10.1016/j.jphotochem.2024.116103
Chuyu Lu , Futao Yi , Jianqing Ma , Mika Erik Tapio Sillanpää , Minghua Zhou , Qing Ye , Huixia Jin , Kefeng Zhang
Metal-organic frameworks (MOFs), such as MIL-125(Ti), are advanced photocatalytic materials due to their tunable compositions and functionalities. However, their practical application in photocatalysis is often limited by their wide bandgap and the inherent structural instability. This study presents a strategy to improve the photocatalytic performance of MIL-125(Ti) by hydrothermal reaction combined with an in-situ decomposition to generate nano TiO2, creating a composite with g-C3N5 nanosheets. The obtained composite exhibited a rate constant of 0.00122 min−1 mg−1 for the degradation of tetracycline hydrochloride under visible light irradiation, which is 24.4 and 20.3 times that of g-C3N5 and MIL-125(Ti), respectively. Characterization results indicated the formation of an effective composite structure that improved the separation efficiency of photogenerated carriers and promoted the generation of reactive oxygen species. The in-situ generated TiO2 within the MIL-125(Ti)/g-C3N5 composite during the preparation and photocatalysis processes not only compensated for the structural damage to the original MIL-125(Ti) but also significantly enhanced its degradation performance under visible light. The recyclability and stability of the composite material were also demonstrated, highlighting its potential for practical photocatalytic applications.
{"title":"In-Situ generation of nano TiO2 from MIL-125(Ti) and its role in boosting the photocatalytic degradation of tetracycline hydrochloride","authors":"Chuyu Lu , Futao Yi , Jianqing Ma , Mika Erik Tapio Sillanpää , Minghua Zhou , Qing Ye , Huixia Jin , Kefeng Zhang","doi":"10.1016/j.jphotochem.2024.116103","DOIUrl":"10.1016/j.jphotochem.2024.116103","url":null,"abstract":"<div><div>Metal-organic frameworks (MOFs), such as MIL-125(Ti), are advanced photocatalytic materials due to their tunable compositions and functionalities. However, their practical application in photocatalysis is often limited by their wide bandgap and the inherent structural instability. This study presents a strategy to improve the photocatalytic performance of MIL-125(Ti) by hydrothermal reaction combined with an in-situ decomposition to generate nano TiO<sub>2</sub>, creating a composite with g-C<sub>3</sub>N<sub>5</sub> nanosheets. The obtained composite exhibited a rate constant of 0.00122 min<sup>−1</sup> mg<sup>−1</sup> for the degradation of tetracycline hydrochloride under visible light irradiation, which is 24.4 and 20.3 times that of g-C<sub>3</sub>N<sub>5</sub> and MIL-125(Ti), respectively. Characterization results indicated the formation of an effective composite structure that improved the separation efficiency of photogenerated carriers and promoted the generation of reactive oxygen species. The in-situ generated TiO<sub>2</sub> within the MIL-125(Ti)/g-C<sub>3</sub>N<sub>5</sub> composite during the preparation and photocatalysis processes not only compensated for the structural damage to the original MIL-125(Ti) but also significantly enhanced its degradation performance under visible light. The recyclability and stability of the composite material were also demonstrated, highlighting its potential for practical photocatalytic applications.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"459 ","pages":"Article 116103"},"PeriodicalIF":4.1,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539836","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}
Pub Date : 2024-10-20DOI: 10.1016/j.jphotochem.2024.116090
Shiyu Li , Lifen Mao , Qinghui Mao , Xiyu Song , Jialiang Zhou , Wujun Ma , Chuntao Lan , Min Li
The pH value of human sweat serves as a crucial biomarker for disease diagnosis, rendering wearable sweat sensors an innovative tool for monitoring human health. However, the commercialization of these devices is seriously impeded by their low sensitivity, poor wearing comfort, and limited reusability. In this work, a reactive dye capable of color change under pH change has been synthesized. Due to the unique molecular structure, the dye molecule exhibits remarkable color change recognition and high sensitivity. To fabricate a wearable pH sensor, screen printing technology was employed for depositing the color-changing dye onto cotton fabric. The resulting sensor demonstrated excellent performance attributes including high color sensitivity, robust cyclic stability in response to pH changes, and exceptional resistance against washing, friction, and sunlight-induced fading. Therefore, this study presents a highly promising approach for achieving real-time monitoring of human sweat pH levels.
{"title":"Donor–π bridge-acceptor dyes featuring dual chromophoric groups for enhanced sensitivity in wearable sweat sensor","authors":"Shiyu Li , Lifen Mao , Qinghui Mao , Xiyu Song , Jialiang Zhou , Wujun Ma , Chuntao Lan , Min Li","doi":"10.1016/j.jphotochem.2024.116090","DOIUrl":"10.1016/j.jphotochem.2024.116090","url":null,"abstract":"<div><div>The pH value of human sweat serves as a crucial biomarker for disease diagnosis, rendering wearable sweat sensors an innovative tool for monitoring human health. However, the commercialization of these devices is seriously impeded by their low sensitivity, poor wearing comfort, and limited reusability. In this work, a reactive dye capable of color change under pH change has been synthesized. Due to the unique molecular structure, the dye molecule exhibits remarkable color change recognition and high sensitivity. To fabricate a wearable pH sensor, screen printing technology was employed for depositing the color-changing dye onto cotton fabric. The resulting sensor demonstrated excellent performance attributes including high color sensitivity, robust cyclic stability in response to pH changes, and exceptional resistance against washing, friction, and sunlight-induced fading. Therefore, this study presents a highly promising approach for achieving real-time monitoring of human sweat pH levels.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"459 ","pages":"Article 116090"},"PeriodicalIF":4.1,"publicationDate":"2024-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539811","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}
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