Pub Date : 2024-10-10DOI: 10.1016/j.jphotochem.2024.116069
Xiu-Mei Song , Hai-Fei Ye , Jiang-Li Song , Yan-Jie Xi , Yancheng Wu
A novel sensor (Sensor 2) containing a fluorescent core of aromatic naphthalene and a binding site of aminothiourea group has been synthesized and systematically investigated with regard to anions recognition. The results indicate that Sensor 2 shows fast response, high selectivity and sensitivity and reversibility to detect fluoride (F−) and cyanide (CN−). Adding F−/CN− into DMSO solution of Sensor 2 induces a distinct color change from colorless to yellow under ambient light and from blue to greenish-blue under 365 nm UV light. Besides, Sensor 2 can distinguish F− from CN− by fluorescent spectra based on the different sensitivities of Sensor 2 to F− and CN−, as well as “turn on” at the different emission wavelengths. The sensing mechanism has been proposed and verified by ESI-MS, 1H NMR titration, DFT and TD-DFT calculations, which refers to the interaction of Sensor 2 with F− and CN−via forming hydrogen bond and subsequent deprotonation. The reversibility of Sensor 2 was also studied, confirming that it is a reusable sensor. In addition, the preliminary application of Sensor 2 for the detection of fluoride in toothpaste was successful.
{"title":"A novel “turn on” fluorescent and colorimetric ICT-based sensor for the detection of fluoride and cyanide ions","authors":"Xiu-Mei Song , Hai-Fei Ye , Jiang-Li Song , Yan-Jie Xi , Yancheng Wu","doi":"10.1016/j.jphotochem.2024.116069","DOIUrl":"10.1016/j.jphotochem.2024.116069","url":null,"abstract":"<div><div>A novel sensor (Sensor <strong>2</strong>) containing a fluorescent core of aromatic naphthalene and a binding site of aminothiourea group has been synthesized and systematically investigated with regard to anions recognition. The results indicate that Sensor <strong>2</strong> shows fast response, high selectivity and sensitivity and reversibility to detect fluoride (F<sup>−</sup>) and cyanide (CN<sup>−</sup>). Adding F<sup>−</sup>/CN<sup>−</sup> into DMSO solution of Sensor <strong>2</strong> induces a distinct color change from colorless to yellow under ambient light and from blue to greenish-blue under 365 nm UV light. Besides, Sensor <strong>2</strong> can distinguish F<sup>−</sup> from CN<sup>−</sup> by fluorescent spectra based on the different sensitivities of Sensor <strong>2</strong> to F<sup>−</sup> and CN<sup>−</sup>, as well as “turn on” at the different emission wavelengths. The sensing mechanism has been proposed and verified by ESI-MS, <sup>1</sup>H NMR titration, DFT and TD-DFT calculations, which refers to the interaction of Sensor <strong>2</strong> with F<sup>−</sup> and CN<sup>−</sup> <em>via</em> forming hydrogen bond and subsequent deprotonation. The reversibility of Sensor <strong>2</strong> was also studied, confirming that it is a reusable sensor. In addition, the preliminary application of Sensor <strong>2</strong> for the detection of fluoride in toothpaste was successful.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"459 ","pages":"Article 116069"},"PeriodicalIF":4.1,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418728","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}
Propranolol hydrochloride, a widely used medication, contaminates water bodies as it’s not fully metabolized by humans. Conventional water treatment methods are ineffective against it, necessitating more advanced approaches like heterogeneous photocatalysis. TiO2, often used as a photocatalyst, is typically combined with other materials to form nanocomposites, enhancing its activity. This study evaluated TiO2 synthesized via sol–gel method with organophilized bentonite for propranolol removal. Composites were prepared through solvothermal treatment, and an experimental design assessed the TiO2/bentonite ratio, time, and temperature of the solvothermal treatment effects on photocatalytic activity. Increasing these parameters led to a nanocomposite capable of removing over 99 % of propranolol in water after 60 min of adsorption followed by 150 min of photocatalysis. The nanocomposite remained active after four treatment cycles. Characterization revealed TiO2 (anatase) nanoparticles with a size range of 6–13 nm dispersed in bentonite’s fine tubular structures. This research underscores the potential of TiO2-based nanocomposites in addressing pharmaceutical contamination in water bodies efficiently.
{"title":"Photocatalytic degradation of propranolol hydrochloride in aqueous medium employing bentonite-TiO2 nanocomposites","authors":"Tamires Pereira Rosa , Gustavo Lopes Colpani , Márcio Antônio Fiori , Noemi Raquel Checca Huaman , Giane Gonçalves Lenzi , Michel Zampieri Fidelis , Onelia Aparecida Andreo dos Santos , Rodrigo Brackmann","doi":"10.1016/j.jphotochem.2024.116080","DOIUrl":"10.1016/j.jphotochem.2024.116080","url":null,"abstract":"<div><div>Propranolol hydrochloride, a widely used medication, contaminates water bodies as it’s not fully metabolized by humans. Conventional water treatment methods are ineffective against it, necessitating more advanced approaches like heterogeneous photocatalysis. TiO<sub>2</sub>, often used as a photocatalyst, is typically combined with other materials to form nanocomposites, enhancing its activity. This study evaluated TiO<sub>2</sub> synthesized via sol–gel method with organophilized bentonite for propranolol removal. Composites were prepared through solvothermal treatment, and an experimental design assessed the TiO<sub>2</sub>/bentonite ratio, time, and temperature of the solvothermal treatment effects on photocatalytic activity. Increasing these parameters led to a nanocomposite capable of removing over 99 % of propranolol in water after 60 min of adsorption followed by 150 min of photocatalysis. The nanocomposite remained active after four treatment cycles. Characterization revealed TiO<sub>2</sub> (anatase) nanoparticles with a size range of 6–13 nm dispersed in bentonite’s fine tubular structures. This research underscores the potential of TiO<sub>2</sub>-based nanocomposites in addressing pharmaceutical contamination in water bodies efficiently.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"459 ","pages":"Article 116080"},"PeriodicalIF":4.1,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418729","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 : 2024-10-10DOI: 10.1016/j.jphotochem.2024.116083
María B. Ballatore , Javier E. Durantini , Claudia Solis , Milena B. Boarini , Miguel Gervaldo , Luis Otero , María E. Milanesio , Edgardo N. Durantini
Zn(II) porphyrin derivatives (ZnACP and ZnTCP-C60) were used to obtain electrogenerated polymeric films on optically transparent indium tin oxide (ITO) electrodes. This approach produced stable and reproducible polymers that increase the lipophilicity of the surfaces. The spectroscopic and photodynamic properties of these polymeric films were compared with those corresponding to their porphyrin units. These materials photosensitized singlet molecular oxygen in water. Photoinactivation activity of the films were investigated in Staphylococcus aureus biofilms depositing on the surfaces. Thus, the ZnTCP-C60 film was effective in reducing bacterial survival, reaching a photokilling of 99.7 %. In addition, ZnACP-coated surface with an absorption of 0.7 at Soret band produced a notable decrease of 4 log units in cell survival (equivalent to 99.99 % reduction) upon an exposure to white light for 60 min. Confocal scanning microscopy and scanning electron microscopy were employed to detect morphological alterations. In addition to its bactericidal effects within the biofilm, PDI using ZnACP films induced cell detachment, thereby disrupting the overall architecture of the biofilm. Thus, these polymeric films emerge as compelling photodynamic active surfaces for eradicating S. aureus bacterial biofilms.
{"title":"Photodynamic surfaces coated with porphyrin-derived polymers to eradicate Staphylococcus aureus biofilms","authors":"María B. Ballatore , Javier E. Durantini , Claudia Solis , Milena B. Boarini , Miguel Gervaldo , Luis Otero , María E. Milanesio , Edgardo N. Durantini","doi":"10.1016/j.jphotochem.2024.116083","DOIUrl":"10.1016/j.jphotochem.2024.116083","url":null,"abstract":"<div><div>Zn(II) porphyrin derivatives (ZnACP and ZnTCP-C<sub>60</sub>) were used to obtain electrogenerated polymeric films on optically transparent indium tin oxide (ITO) electrodes. This approach produced stable and reproducible polymers that increase the lipophilicity of the surfaces. The spectroscopic and photodynamic properties of these polymeric films were compared with those corresponding to their porphyrin units. These materials photosensitized singlet molecular oxygen in water. Photoinactivation activity of the films were investigated in <em>Staphylococcus aureus</em> biofilms depositing on the surfaces. Thus, the ZnTCP-C<sub>60</sub> film was effective in reducing bacterial survival, reaching a photokilling of 99.7 %. In addition, ZnACP-coated surface with an absorption of 0.7 at Soret band produced a notable decrease of 4 log units in cell survival (equivalent to 99.99 % reduction) upon an exposure to white light for 60 min. Confocal scanning microscopy and scanning electron microscopy were employed to detect morphological alterations. In addition to its bactericidal effects within the biofilm, PDI using ZnACP films induced cell detachment, thereby disrupting the overall architecture of the biofilm. Thus, these polymeric films emerge as compelling photodynamic active surfaces for eradicating <em>S. aureus</em> bacterial biofilms.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"459 ","pages":"Article 116083"},"PeriodicalIF":4.1,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418732","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 : 2024-10-09DOI: 10.1016/j.jphotochem.2024.116072
Dengmeng Song , Jiaojiao Wei , Luyao Qiang , Jun Li
Porphyrin based covalent organic polymers are excellent catalysts. Herein, a sp2 carbon linked porphyrin based organic polymer H2Pp-PDAN was designed and synthesized by co-condensation of porphyrin monomer containing flexible chains H2Pp with 1, 4-phenylenediacetonitrile PDAN. As photocatalysts, H2Pp-PDAN exhibited excellent photocatalytic performance for photocatalytic oxidative coupling of amines, and was successfully used for 15 consecutive reactions with no detectable reduction of the catalytic activity. H2Pp-PDAN showed good photocatalytic activity and excellent recyclability for photocatalytic oxidation of thioanisole to methyl phenyl sulfoxide. Mechanistic studies revealed that the photocatalytic oxidation of benzylamine coupling by H2Pp-PDAN proceeds via both energy transfer and electron transfer pathways.
{"title":"A Porphyrin-Based sp2 Carbon-Conjugated covalent organic polymer containing flexible chains for efficient heterogeneous photocatalysis","authors":"Dengmeng Song , Jiaojiao Wei , Luyao Qiang , Jun Li","doi":"10.1016/j.jphotochem.2024.116072","DOIUrl":"10.1016/j.jphotochem.2024.116072","url":null,"abstract":"<div><div>Porphyrin based covalent organic polymers are excellent catalysts. Herein, a sp<sup>2</sup> carbon linked porphyrin based organic polymer H<sub>2</sub>Pp-PDAN was designed and synthesized by co-condensation of porphyrin monomer containing flexible chains H<sub>2</sub>Pp with 1, 4-phenylenediacetonitrile PDAN. As photocatalysts, H<sub>2</sub>Pp-PDAN exhibited excellent photocatalytic performance for photocatalytic oxidative coupling of amines, and was successfully used for 15 consecutive reactions with no detectable reduction of the catalytic activity. H<sub>2</sub>Pp-PDAN showed good photocatalytic activity and excellent recyclability for photocatalytic oxidation of thioanisole to methyl phenyl sulfoxide. Mechanistic studies revealed that the photocatalytic oxidation of benzylamine coupling by H<sub>2</sub>Pp-PDAN proceeds via both energy transfer and electron transfer pathways.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"459 ","pages":"Article 116072"},"PeriodicalIF":4.1,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432155","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}
Guanine rich DNA sequences are widespread throughout the genome and they are prone to form G-quadruplex structures both in-vitro and in-vivo. Owing to their regulatory roles in important biological reactions, DNA G-quadruplexes are the prime target for the development of anti-cancer drug molecules. In the present study, we have investigated the interaction of curcumin with anti-parallel chair and basket type DNA G-quadruplexes formed by thrombin binding aptamer (TBA) and human telomeric repeat (HTG) sequences, respectively. The results obtained from spectroscopic techniques demonstrated that curcumin interacts with both the DNA G-quadruplexes through external binding mode and the estimated apparent binding constant value (Kb) was slightly higher for HTG (Kb = (4.38 ± 0.09) × 105 M−1) than that estimated for TBA (Kb = (0.62 ± 0.02) × 105 M−1) DNA G-quadruplex structures. It was also revealed that upon binding with curcumin, TBA and HTG DNA G-quadruplexes were slightly stabilized and destabilized, respectively. Circular dichroism study revealed that upon binding with curcumin the global structure of both the DNA G-quadruplexes was unaltered, whereas the local structure of HTG DNA G-quaruplex was slightly altered. Conjointly all the aforementioned spectroscopic methods emphasize that curcumin has differential interaction with anti-parallel DNA G-quadruplex structures depending on their loop orientation.
富含鸟嘌呤的 DNA 序列遍布整个基因组，在体外和体内都容易形成 G 型四联体结构。由于其在重要生物反应中的调控作用，DNA G-四联体是开发抗癌药物分子的主要目标。在本研究中，我们研究了姜黄素与由凝血酶结合适配体（TBA）和人类端粒重复序列（HTG）分别形成的反平行椅型和篮型DNA G-四联体的相互作用。光谱技术得出的结果表明，姜黄素通过外部结合模式与这两种DNA G-四重链相互作用，HTG（Kb = (4.38 ± 0.09) × 105 M-1）的表观结合常数（Kb）略高于TBA（Kb = (0.62 ± 0.02) × 105 M-1）的DNA G-四重链结构。研究还发现，与姜黄素结合后，TBA 和 HTG DNA G-四重链分别略微稳定和不稳定。环二色性研究表明，与姜黄素结合后，两种 DNA G-四重链的整体结构没有改变，而 HTG DNA G-四重链的局部结构则略有改变。上述所有光谱分析方法都表明，姜黄素与反平行 DNA G-四重链结构的相互作用因其环向而异。
{"title":"Differential binding of curcumin with chair and basket type anti-parallel DNA G-quadruplexes","authors":"Pabitra Mandal , Priyabrata Das , Sudipta Bhowmik , Smritimoy Pramanik","doi":"10.1016/j.jphotochem.2024.116075","DOIUrl":"10.1016/j.jphotochem.2024.116075","url":null,"abstract":"<div><div>Guanine rich DNA sequences are widespread throughout the genome and they are prone to form G-quadruplex structures both <em>in-vitro</em> and <em>in-vivo</em>. Owing to their regulatory roles in important biological reactions, DNA G-quadruplexes are the prime target for the development of anti-cancer drug molecules. In the present study, we have investigated the interaction of curcumin with anti-parallel chair and basket type DNA G-quadruplexes formed by thrombin binding aptamer (TBA) and human telomeric repeat (HTG) sequences, respectively. The results obtained from spectroscopic techniques demonstrated that curcumin interacts with both the DNA G-quadruplexes through external binding mode and the estimated apparent binding constant value (<em>K<sub>b</sub></em>) was slightly higher for HTG (<em>K<sub>b</sub></em> = (4.38 ± 0.09) × 10<sup>5</sup> M<sup>−1</sup>) than that estimated for TBA (<em>K<sub>b</sub></em> = (0.62 ± 0.02) × 10<sup>5</sup> M<sup>−1</sup>) DNA G-quadruplex structures. It was also revealed that upon binding with curcumin, TBA and HTG DNA G-quadruplexes were slightly stabilized and destabilized, respectively. Circular dichroism study revealed that upon binding with curcumin the global structure of both the DNA G-quadruplexes was unaltered, whereas the local structure of HTG DNA G-quaruplex was slightly altered. Conjointly all the aforementioned spectroscopic methods emphasize that curcumin has differential interaction with anti-parallel DNA G-quadruplex structures depending on their loop orientation.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"459 ","pages":"Article 116075"},"PeriodicalIF":4.1,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142438435","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 : 2024-10-09DOI: 10.1016/j.jphotochem.2024.116073
Hind Ahmed Siddiq , Amani Alhifthi , Reem Ghubayra , Metwally Madkour
The objective of the present research was to examine the usefulness of the photocatalytic degradation process in removing the ciprofloxacin drug from wastewater, which is difficult to remove from waterbodies. To tackle this difficulty, a ternary copper niobium oxide/carbon nitride/layered bismuthene heterostructure (CuNb13O33/g-C3N5-L-Bi) composite was developed by an intuitive solvothermal process. layered bismuthene (L-Bi) was prepared using a unique ball milling approach. According to the results of the characterization, adding L-Bi and g-C3N5 with a low band gap to the original band structure of CuNb13O33 makes it more efficient. After 120 min of irradiation, the modified CuNb13O33/g-C3N5-L-Bi sample significantly improved ciprofloxacin degradation, resulting in a degradation rate of 98 %. In addition, the impact of the catalyst that has been created on the removal of ciprofloxacin at various pH, catalyst dosages, and scavengers was also examined, demonstrating the catalyst’s suitability for purifying natural water environments. A detailed study of the steps used to break down ciprofloxacin has shown that many active species are involved, with a focus on the important roles played by reactive oxidative species (ROS). Thus, this study introduces a novel combination of layered bismuthene photocatalysts for environmentally friendly degradation of antibiotics.
{"title":"Layered bismuthene forming the interfacial pathway for rapid charge transfer in CuNb13O33/g-C3N5 photocatalyst for enhancing ciprofloxacin degradation","authors":"Hind Ahmed Siddiq , Amani Alhifthi , Reem Ghubayra , Metwally Madkour","doi":"10.1016/j.jphotochem.2024.116073","DOIUrl":"10.1016/j.jphotochem.2024.116073","url":null,"abstract":"<div><div>The objective of the present research was to examine the usefulness of the photocatalytic degradation process in removing the ciprofloxacin drug from wastewater, which is difficult to remove from waterbodies. To tackle this difficulty, a ternary copper niobium oxide/carbon nitride/layered bismuthene heterostructure (CuNb<sub>13</sub>O<sub>33</sub>/g-C<sub>3</sub>N<sub>5</sub>-L-Bi) composite was developed by an intuitive solvothermal process. layered bismuthene (L-Bi) was prepared using a unique ball milling approach. According to the results of the characterization, adding L-Bi and g-C<sub>3</sub>N<sub>5</sub> with a low band gap to the original band structure of CuNb<sub>13</sub>O<sub>33</sub> makes it more efficient. After 120 min of irradiation, the modified CuNb<sub>13</sub>O<sub>33</sub>/g-C<sub>3</sub>N<sub>5</sub>-L-Bi sample significantly improved ciprofloxacin degradation, resulting in a degradation rate of 98 %. In addition, the impact of the catalyst that has been created on the removal of ciprofloxacin at various pH, catalyst dosages, and scavengers was also examined, demonstrating the catalyst’s suitability for purifying natural water environments. A detailed study of the steps used to break down ciprofloxacin has shown that many active species are involved, with a focus on the important roles played by reactive oxidative species (ROS). Thus, this study introduces a novel combination of layered bismuthene photocatalysts for environmentally friendly degradation of antibiotics.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"459 ","pages":"Article 116073"},"PeriodicalIF":4.1,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418733","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 : 2024-10-09DOI: 10.1016/j.jphotochem.2024.116070
Twinkle Anna Jose, Jeena Rose Jose, M.S. Amogh, Cyriac Joseph, P.R. Biju
Red phosphors have garnered an important role in white light-emitting diodes (W-LEDs). Herein we report the structural and luminescent properties of red-emitting Sr(3-x-y)NaSbO6: xSm3+/yEu3+ (SNSO: xSm; yEu) phosphors. Under 350 nm excitation, phosphors emit intense red emission peaking around 689 nm owing to the SNSO host emission. Optimized singly doped SNSO: 0.1Sm and SNSO: 0.2Eu phosphors have intense orange-red and red emissions under 405 and 305 nm excitations respectively. For the codoped SNSO: 0.1Sm; yEu phosphors (y = 0.1, 0.15, 0.2, 0.25, and 0.3 mol), the emission peaks of the host, Sm3+, and Eu3+ ions were present. The energy transfer from the host to Sm3+/ Eu3+ ions and from Sm3+ to Eu3+ ions was identified to be via dipole-quadrupole and quadrupole–quadrupole interactions respectively. Effective red tuning along with high color purity and warm CCT values suggest the suitability of prepared nanorod phosphors for W-LEDs and indoor plant growth LEDs.
{"title":"Photoluminescence investigations on Sm3+/Eu3+ co-doped Sr3NaSbO6 nanorod-shaped red phosphor for W-LEDs and indoor plant growth LEDs","authors":"Twinkle Anna Jose, Jeena Rose Jose, M.S. Amogh, Cyriac Joseph, P.R. Biju","doi":"10.1016/j.jphotochem.2024.116070","DOIUrl":"10.1016/j.jphotochem.2024.116070","url":null,"abstract":"<div><div>Red phosphors have garnered an important role in white light-emitting diodes (W-LEDs). Herein we report the structural and luminescent properties of red-emitting Sr<sub>(3-x-y)</sub>NaSbO<sub>6</sub>: xSm<sup>3+</sup>/yEu<sup>3+</sup> (SNSO: xSm; yEu) phosphors. Under 350 nm excitation, phosphors emit intense red emission peaking around 689 nm owing to the SNSO host emission. Optimized singly doped SNSO: 0.1Sm and SNSO: 0.2Eu phosphors have intense orange-red and red emissions under 405 and 305 nm excitations respectively. For the codoped SNSO: 0.1Sm; yEu phosphors (y = 0.1, 0.15, 0.2, 0.25, and 0.3 mol), the emission peaks of the host, Sm<sup>3+</sup>, and Eu<sup>3+</sup> ions were present. The energy transfer from the host to Sm<sup>3+</sup>/ Eu<sup>3+</sup> ions and from Sm<sup>3+</sup> to Eu<sup>3+</sup> ions was identified to be via dipole-quadrupole and quadrupole–quadrupole interactions respectively. Effective red tuning along with high color purity and warm CCT values suggest the suitability of prepared nanorod phosphors for W-LEDs and indoor plant growth LEDs.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"459 ","pages":"Article 116070"},"PeriodicalIF":4.1,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418731","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 : 2024-10-09DOI: 10.1016/j.jphotochem.2024.116076
Shubham Raj , Subrata Das , Tushar Das , Raphaël Schneider
Antibiotics-based effluents pose a severe threat to the natural ecosystem by acting as reservoirs for the growth of drug-resistant bacteria if untreated. Herein, a facile and scalable approach was developed to engineer photocatalysts associating reduced graphene oxide (rGO) and molybdenum disulfide (rGO@MoS2) that were used for the degradation of chloramphenicol (CAP) from contaminated water under UV-light. The hydrothermally produced rGO@MoS2 catalysts contain CO, COH, and COC functional groups that contribute to the binding of CAP onto their surface. The rGO surface modification with MoS2 layers offers a high surface area for light absorption. Results show that the rGO@MoS2 catalyst (1:1 w/w) exhibits the highest degradation efficiency (DE) of 86 % within 180 min of light exposure at neutral pH. Further, the kinetic modelling studies for CAP degradation by rGO@MoS2 1:1 showed high linearity with pseudo-first order kinetics (R2 ∼ 0.9). The isotherm modelling studies correspond to Langmuir isotherm (R2 ∼ 0.99), suggesting monolayer-type interaction of CAP with the photocatalyst surface during photodegradation. Furthermore, the mechanism of degradation elucidated using scavenging experiments showed the involvement of both holes (h+) and electrons (e−) that contribute to the degradation of CAP by generating reactive oxygen species (ROS) like OH● and O2●− radicals. The applicability of the rGO@MoS2 photocatalyst towards the degradation of CAP was tested in Ganga water, wherein a similar ∼86 % CAP removal was observed. Furthermore, the photocatalyst was found to be stable and could be reused five times. Overall, these findings demonstrate the usefulness of the rGO@MoS2 1:1 composite as an efficient photocatalyst that can be used for the degradation of harmful organic pollutants from water bodies to provide a safer and cleaner environment.
以抗生素为基础的污水对自然生态系统构成了严重威胁，因为如果不加以处理，这些污水就会成为耐药细菌滋生的温床。在此，研究人员开发了一种简便、可扩展的方法，将还原氧化石墨烯（rGO）和二硫化钼（rGO@MoS2）结合在一起，制成光催化剂，用于在紫外光下降解污染水中的氯霉素（CAP）。水热法制备的 rGO@MoS2 催化剂含有 CO、COH 和 COC 官能团，有助于将 CAP 结合到其表面。用 MoS2 层对 rGO 表面进行修饰可提供高表面积，有利于光吸收。结果表明，rGO@MoS2 催化剂（1:1 w/w）的降解效率（DE）最高，在中性 pH 值下，光照射 180 分钟内降解效率达到 86%。此外，对 rGO@MoS2 1:1 降解 CAP 的动力学建模研究表明，该催化剂与假一阶动力学具有高度线性关系（R2 ∼ 0.9）。等温线模型研究与 Langmuir 等温线（R2 ∼ 0.99）一致，表明光降解过程中 CAP 与光催化剂表面的相互作用为单层型。此外，利用清除实验阐明的降解机理表明，空穴（h+）和电子（e-）都参与了 CAP 的降解，它们通过产生活性氧（ROS），如 OH● 和 O2●- 自由基，促进了 CAP 的降解。在恒河水中测试了 rGO@MoS2 光催化剂降解 CAP 的适用性，观察到类似的 CAP 去除率为 ∼86%。此外，还发现这种光催化剂非常稳定，可以重复使用五次。总之，这些研究结果证明了 rGO@MoS2 1:1 复合材料作为一种高效光催化剂的实用性，可用于降解水体中的有害有机污染物，从而提供更安全、更清洁的环境。
{"title":"Efficient photocatalytic degradation of chloramphenicol from contaminated water over rGO@MoS2 nanocomposites","authors":"Shubham Raj , Subrata Das , Tushar Das , Raphaël Schneider","doi":"10.1016/j.jphotochem.2024.116076","DOIUrl":"10.1016/j.jphotochem.2024.116076","url":null,"abstract":"<div><div>Antibiotics-based effluents pose a severe threat to the natural ecosystem by acting as reservoirs for the growth of drug-resistant bacteria if untreated. Herein, a facile and scalable approach was developed to engineer photocatalysts associating reduced graphene oxide (rGO) and molybdenum disulfide (rGO@MoS<sub>2</sub>) that were used for the degradation of chloramphenicol (CAP) from contaminated water under UV-light. The hydrothermally produced rGO@MoS<sub>2</sub> catalysts contain C<img>O, C<img>OH, and C<img>O<img>C functional groups that contribute to the binding of CAP onto their surface. The rGO surface modification with MoS<sub>2</sub> layers offers a high surface area for light absorption. Results show that the rGO@MoS<sub>2</sub> catalyst (1:1 w/w) exhibits the highest degradation efficiency (DE) of 86 % within 180 min of light exposure at neutral pH. Further, the kinetic modelling studies for CAP degradation by rGO@MoS<sub>2 1:1</sub> showed high linearity with pseudo-first order kinetics (R<sup>2</sup> ∼ 0.9). The isotherm modelling studies correspond to Langmuir isotherm (R<sup>2</sup> ∼ 0.99), suggesting monolayer-type interaction of CAP with the photocatalyst surface during photodegradation. Furthermore, the mechanism of degradation elucidated using scavenging experiments showed the involvement of both holes (h<sup>+</sup>) and electrons (e<sup>−</sup>) that contribute to the degradation of CAP by generating reactive oxygen species (ROS) like OH<sup>●</sup> and O<sub>2</sub><sup>●−</sup> radicals. The applicability of the rGO@MoS<sub>2</sub> photocatalyst towards the degradation of CAP was tested in Ganga water, wherein a similar ∼86 % CAP removal was observed. Furthermore, the photocatalyst was found to be stable and could be reused five times. Overall, these findings demonstrate the usefulness of the rGO@MoS<sub>2 1:1</sub> composite as an efficient photocatalyst that can be used for the degradation of harmful organic pollutants from water bodies to provide a safer and cleaner environment.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"459 ","pages":"Article 116076"},"PeriodicalIF":4.1,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418736","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 : 2024-10-09DOI: 10.1016/j.jphotochem.2024.116067
S. Gayathri , M. Saravanakumar , P. Manikandan , Jamal M. Khaled , S. Sakthivel , S. Muthu
The current research explored the structural optimization, electrical and vibrational characteristics, and quantum chemical calculations via the procedure of DFT for a purine derivative, 7-[(2R)-2-hydroxypropyl]-1,3-dimethylpurine-2,6-dione (2HDPD). Functional groups were found by correlating FT-IR with simulated spectra. TD-DFT calculations were done for UV–vis absorption and to ascertain the electronic properties of both the solvent and the gas phase, enabling additional study of the compounds LHE. The experimental outcomes and theoretic parameters are in good agreement. LUMO and HOMO band gaps spectacle that the molecule is chemically reactive and that there is adequate charge transfer. Polar solvent exhibits the highest band gap value, 5.057 eV. Numerous topological considerations were accomplished using the Multiwfn tool. Charge transfer investigations have demonstrated the most imperative states. Weak intermolecular interactions were investigated using RDG analysis, LOL, NBO, and ELF. The 2HDPD compounds reactive areas were discovered by applying the MEP and Fukui investigations. Hyperpolarizability characteristics were used to calculate NLO behavior. The drug-like characteristics of the molecule follow Lipinski five rules. After docking with the proteins 1NG2, 2DVV, 3CAF, and 7OEX, the compound 2HDPD showed moderate binding affinities of −5.28, −5.04, −4.96, and −5.66 kcal/mol, in that order. The Ramachandran plot verified the proteins stability and advantageous locations. The Docking results show compound 2HDPD exhibited a COPD property.
{"title":"Quantum computational and experimental spectroscopic investigation (FT-IR, Raman, UV–Vis), PES, LHE and topological investigations of 7-[(2R)-2-hydroxypropyl]-1,3-dimethylpurine-2,6-dione","authors":"S. Gayathri , M. Saravanakumar , P. Manikandan , Jamal M. Khaled , S. Sakthivel , S. Muthu","doi":"10.1016/j.jphotochem.2024.116067","DOIUrl":"10.1016/j.jphotochem.2024.116067","url":null,"abstract":"<div><div>The current research explored the structural optimization, electrical and vibrational characteristics, and quantum chemical calculations via the procedure of DFT for a purine derivative, 7-[(2R)-2-hydroxypropyl]-1,3-dimethylpurine-2,6-dione (2HDPD). Functional groups were found by correlating FT-IR with simulated spectra. TD-DFT calculations were done for UV–vis absorption and to ascertain the electronic properties of both the solvent and the gas phase, enabling additional study of the compounds LHE. The experimental outcomes and theoretic parameters are in good agreement. LUMO and HOMO band gaps spectacle that the molecule is chemically reactive and that there is adequate charge transfer. Polar solvent exhibits the highest band gap value, 5.057 eV. Numerous topological considerations were accomplished using the Multiwfn tool. Charge transfer investigations have demonstrated the most imperative states. Weak intermolecular interactions were investigated using RDG analysis, LOL, NBO, and ELF. The 2HDPD compounds reactive areas were discovered by applying the MEP and Fukui investigations. Hyperpolarizability characteristics were used to calculate NLO behavior. The drug-like characteristics of the molecule follow Lipinski five rules. After docking with the proteins 1NG2, 2DVV, 3CAF, and 7OEX, the compound 2HDPD showed moderate binding affinities of −5.28, −5.04, −4.96, and −5.66 kcal/mol, in that order. The Ramachandran plot verified the proteins stability and advantageous locations. The Docking results show compound 2HDPD exhibited a COPD property.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"459 ","pages":"Article 116067"},"PeriodicalIF":4.1,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418735","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 : 2024-10-06DOI: 10.1016/j.jphotochem.2024.116077
Elham N. Bifari , Si Mohamed Bouzzine , Reda M. El-Shishtawy
Three novel hemicyanine dyes, D1-D3, were synthesized successfully based on dimethylaniline (DMA) and TPA donors and a carboxylated indolium vinyl acceptor linked through benzene unit as an extended π-spacer or through PTZ unit as an auxiliary donor to form the D1-π-A, D2-π-A & D2-D3-A systems, respectively. A multi-step process was conducted to yield the desired donor and acceptor intermediates. These were finally coupled through the Suzuki-Miyaura coupling and Knoevenagel condensation reactions to obtain the desired target dyes. A panchromatic response and a bathochromic shift of the ICT band maxima in the visible region were observed with the lowest band gap energy, Eg = 1.71 eV and λabs., max. = 590 nm, given by dye D3, were attributed to the presence of the auxiliary donor, PTZ. However, due to the high coplanarity of dye D1 it showed the highest absorptivity value of ε = 36462 M−1cm−1. The HOMO and LUMO levels are within the range suitable for smooth dye regeneration and electron ejection, EHOMO = -5.37 to −5.18 eV, and ELUMO = -3.47 to −3.27 eV. The density functional theory (DFT) and time-dependent TD-DFT at the B3LYP/6-31G(d,p) level were conducted to explore the bridged effect on geometric and TD-BHandH/6-31G(d,p) for optoelectronic properties.
{"title":"Novel Indolenine-Based hemicyanine dyes with extended π-Linker and auxiliary donor as potential Photosensitizers: Synthesis, Photophysical, electrochemical and computational Insights","authors":"Elham N. Bifari , Si Mohamed Bouzzine , Reda M. El-Shishtawy","doi":"10.1016/j.jphotochem.2024.116077","DOIUrl":"10.1016/j.jphotochem.2024.116077","url":null,"abstract":"<div><div>Three novel hemicyanine dyes, <strong><em>D1-D3</em></strong>, were synthesized successfully based on dimethylaniline (DMA) and TPA donors and a carboxylated indolium vinyl acceptor linked through benzene unit as an extended π-spacer or through <em>PTZ</em> unit as an auxiliary donor to form the D<sub>1</sub>-π-A, D<sub>2</sub>-π-A & D<sub>2</sub>-D<sub>3</sub>-A systems, respectively. A multi-step process was conducted to yield the desired donor and acceptor intermediates. These were finally coupled through the Suzuki-Miyaura coupling and Knoevenagel condensation reactions to obtain the desired target dyes. A panchromatic response and a bathochromic shift of the ICT band maxima in the visible region were observed with the lowest band gap energy, E<sub>g</sub> = 1.71 eV and λ<sub>abs., max.</sub> = 590 nm, given by dye <strong><em>D3,</em></strong> were attributed to the presence of the auxiliary donor, <em>PTZ</em>. However, due to the high coplanarity of dye <strong><em>D1</em></strong> it showed the highest absorptivity value of ε = 36462 M<sup>−1</sup>cm<sup>−1</sup>. The HOMO and LUMO levels are within the range suitable for smooth dye regeneration and electron ejection, E<sub>HOMO</sub> = -5.37 to −5.18 eV, and E<sub>LUMO</sub> = -3.47 to −3.27 eV. The density functional theory (DFT) and time-dependent TD-DFT at the B3LYP/6-31G(d,p) level were conducted to explore the bridged effect on geometric and TD-BHandH/6-31G(d,p) for optoelectronic properties.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"459 ","pages":"Article 116077"},"PeriodicalIF":4.1,"publicationDate":"2024-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418813","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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