The broad UVA (UVAI and UVAII) filtering activity of the sunscreen agent avobenzone is due to its enolic forms which undergoes ketonization followed by degradation upon exposure to sunlight/radiation. The current report aims to lock the enolic forms of avobenzone through chemical derivatization that preserves the chelated intramolecular hydrogen bond geometry. The pyrimidine derivative mimicking both the enol-1 and enol-2 forms of avobenzone has been synthesized and evaluated for it photostability under natural sunlight by UV spectroscopy. The avobenzone pyrimidine derivative acts as a broad-spectrum UVAII, and UVB filter and exhibits unprecedented photostability under sunlight. The new derivative of avobenzone is a valuable additive to the tool kit of chemical UV filters and its poor skin permeability relative to the native avobenzone may be an advantage for cosmetics.
{"title":"Pyrimidine derivative mimicking the locked enol form of avobenzone acts as a photostable UVAII and UVB filter","authors":"Deepak Kumar Sahoo , Abhishek Nayak , Srinivas Reddy Dannarm , A. Subha Jahnavi , Amol G. Dikundwar , Rajesh Sonti , Konkallu Hanumae Gowd","doi":"10.1016/j.jphotochem.2024.116099","DOIUrl":"10.1016/j.jphotochem.2024.116099","url":null,"abstract":"<div><div>The broad UVA (UVAI and UVAII) filtering activity of the sunscreen agent avobenzone is due to its enolic forms which undergoes ketonization followed by degradation upon exposure to sunlight/radiation. The current report aims to lock the enolic forms of avobenzone through chemical derivatization that preserves the chelated intramolecular hydrogen bond geometry. The pyrimidine derivative mimicking both the enol-1 and enol-2 forms of avobenzone has been synthesized and evaluated for it photostability under natural sunlight by UV spectroscopy. The avobenzone pyrimidine derivative acts as a broad-spectrum UVAII, and UVB filter and exhibits unprecedented photostability under sunlight. The new derivative of avobenzone is a valuable additive to the tool kit of chemical UV filters and its poor skin permeability relative to the native avobenzone may be an advantage for cosmetics.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"459 ","pages":"Article 116099"},"PeriodicalIF":4.1,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539808","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 : 2024-10-19DOI: 10.1016/j.jphotochem.2024.116098
Jiehua Ma , Bing Qian , Weijian Gong , Xin Cui , Lili Ge , Juan Xu
Metal-organic frameworks (MOFs) are a class of materials with highly ordered pore structures. Due to their unique physical and chemical properties, they show great potential in the field of biosensors. Some MOFs can adsorb fluorescently labeled nucleic acid aptamers through various interaction mechanisms (such as electrostatic interactions, π-π stacking, hydrogen bonding, etc.). These interactions not only ensure the stable binding of the aptamers but also allow for their controlled release under specific conditions (such as changes in pH, temperature, or the presence of specific molecules). This mechanism provides multiple possibilities for the design of biosensors. Herein, we have systematically compared the quenching effects of widely used MOFs that can bind to aptamers, i.e., Fe-MOF (MIL-101), Cu-MOF, Zn-MOF (ZIF-8) and Zr-MOF (UiO-66). The study on the kinetics, quenching efficiency, and influencing factors such as ionic strength pH and temperature is performed. Interestingly, Cu-MOF exhibits superior quenching abilities to the other three materials in both the quenching efficiency and kinetics. Thus, a Cu-MOF based fluorescent sensor is reported to detect the ovarian cancer marker carbohydrate antigen 125 (CA125), which provides convenient detection performance (assay time about 10 min), and a detection range from 0.1 to 400 ng/mL. Moreover, it is designed in a simple mix-and-detect format and can be directly applied to clinical sample detection. This work may offer guidance for the choice of MOFs and elaborate design of biosensors.
{"title":"Metal organic frameworks (MOFs)-based fluorescent CA125 analysis: A comparative study of the quenching effects of MIL-101, Cu-MOF, ZIF-8, UiO-66","authors":"Jiehua Ma , Bing Qian , Weijian Gong , Xin Cui , Lili Ge , Juan Xu","doi":"10.1016/j.jphotochem.2024.116098","DOIUrl":"10.1016/j.jphotochem.2024.116098","url":null,"abstract":"<div><div>Metal-organic frameworks (MOFs) are a class of materials with highly ordered pore structures. Due to their unique physical and chemical properties, they show great potential in the field of biosensors. Some MOFs can adsorb fluorescently labeled nucleic acid aptamers through various interaction mechanisms (such as electrostatic interactions, π-π stacking, hydrogen bonding, etc.). These interactions not only ensure the stable binding of the aptamers but also allow for their controlled release under specific conditions (such as changes in pH, temperature, or the presence of specific molecules). This mechanism provides multiple possibilities for the design of biosensors. Herein, we have systematically compared the quenching effects of widely used MOFs that can bind to aptamers, i.e., Fe-MOF (MIL-101), Cu-MOF, Zn-MOF (ZIF-8) and Zr-MOF (UiO-66). The study on the kinetics, quenching efficiency, and influencing factors such as ionic strength pH and temperature is performed. Interestingly, Cu-MOF exhibits superior quenching abilities to the other three materials in both the quenching efficiency and kinetics. Thus, a Cu-MOF based fluorescent sensor is reported to detect the ovarian cancer marker carbohydrate antigen 125 (CA125), which provides convenient detection performance (assay time about 10 min), and a detection range from 0.1 to 400 ng/mL. Moreover, it is designed in a simple mix-and-detect format and can be directly applied to clinical sample detection. This work may offer guidance for the choice of MOFs and elaborate design of biosensors.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"459 ","pages":"Article 116098"},"PeriodicalIF":4.1,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539839","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 : 2024-10-19DOI: 10.1016/j.jphotochem.2024.116088
Yu Wang , Ting Ma , Wenda Zhang
Carboxylesterases (CEs) have attracted increasingly attention in the physiological and pathological processes of many diseases such as diabetes, hepatocellular carcinoma (HCC) and drug metabolism. Selective detection of CEs activity is imperative to evaluate the pathophysiological process of CEs-related disease. Herein, a selective near-infrared (NIR) fluorescent probe (DCM-CE) with high selectivity is reported. DCM-CE was composed of dicyanoisophorone-based fluorophore and carbamate unit which is a highly selective identification group for CEs. DCM-CE exhibited good sensitivity for CEs detection at physiological pH and temperature. Furthermore, DCM-CE featured large Stokes shift (175 nm) and good at tracking the drug-induced trace change of CEs activity in HepG2 cells with little effect on cell viability. Moreover, DCM-CE was applied to monitor the activity of CEs in living mice. Taken all together, DCM-CE had extensive potential application value in detecting CEs for evaluating related diseases.
羧基酯酶（CEs）在糖尿病、肝细胞癌（HCC）和药物代谢等多种疾病的生理和病理过程中日益受到关注。要评估 CEs 相关疾病的病理生理过程，必须对 CEs 活性进行选择性检测。本文报告了一种具有高选择性的近红外（NIR）荧光探针（DCM-CE）。DCM-CE 由基于二氰异佛尔酮的荧光团和氨基甲酸酯单元组成，氨基甲酸酯单元是 CEs 的高选择性识别基团。在生理 pH 值和温度条件下，DCM-CE 对 CEs 的检测具有良好的灵敏度。此外，DCM-CE 还具有较大的斯托克斯位移（175 nm），能很好地跟踪药物诱导的 HepG2 细胞中 CEs 活性的微量变化，且对细胞活力影响很小。此外，DCM-CE 还可用于监测活体小鼠体内 CEs 的活性。综上所述，DCM-CE 在检测 CEs 以评估相关疾病方面具有广泛的潜在应用价值。
{"title":"Detection of carboxylesterases by an activatable NIR fluorescence probe with high selectivity in living systems","authors":"Yu Wang , Ting Ma , Wenda Zhang","doi":"10.1016/j.jphotochem.2024.116088","DOIUrl":"10.1016/j.jphotochem.2024.116088","url":null,"abstract":"<div><div>Carboxylesterases (CEs) have attracted increasingly attention in the physiological and pathological processes of many diseases such as diabetes, hepatocellular carcinoma (HCC) and drug metabolism. Selective detection of CEs activity is imperative to evaluate the pathophysiological process of CEs-related disease. Herein, a selective near-infrared (NIR) fluorescent probe <strong>(DCM-CE</strong>) with high selectivity is reported. <strong>DCM-CE</strong> was composed of dicyanoisophorone-based fluorophore and carbamate unit which is a highly selective identification group for CEs. <strong>DCM-CE</strong> exhibited good sensitivity for CEs detection at physiological pH and temperature. Furthermore, <strong>DCM-CE</strong> featured large Stokes shift (175 nm) and good at tracking the drug-induced trace change of CEs activity in HepG2 cells with little effect on cell viability. Moreover, <strong>DCM-CE</strong> was applied to monitor the activity of CEs in living mice. Taken all together, <strong>DCM-CE</strong> had extensive potential application value in detecting CEs for evaluating related diseases.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"459 ","pages":"Article 116088"},"PeriodicalIF":4.1,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539807","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 : 2024-10-19DOI: 10.1016/j.jphotochem.2024.116091
Nikita A. Shekhovtsov , Elena B. Nikolaenkova , Sofia Vorobyeva , Alexey A. Ryadun , Mark B. Bushuev
ESIPT-based materials (ESIPT = Excited State Intramolecular Proton Transfer) find diverse applications in optoelectronics and biomedicine owing to the peculiarities of their luminescence properties. Here, an ESIPT-capable compound 2-(3,5-dimethyl-1H-pyrazol-1-yl)-4-(2-hydroxyphenyl)pyrimidine (HL4,2,Me) featuring a short O–H⋅⋅⋅N intramolecular hydrogen bond and two N,N-sites for metal binding has been synthesized. HL4,2,Me is the first reported molecule which can act as an ESIPT molecular switch triggered by metal ion coordination without its deprotonation. Drastic changes in the HL4,2,Me conformation in the [Zn(HL4,2,Me)X2] (X = Cl, Br, I) complexes significantly alter the photoluminescence response compared to the free ligand. In the solid state, HL4,2,Me exhibits barrierless ESIPT and large Stokes-shifted yellow-orange emission due to the interplay of anti-Kasha S2 → S0 fluorescence and Kasha-like T1 → S0 phosphorescence radiative channels. The violation of Kasha’s rule for HL4,2,Me is justified by an extraordinarily large S2 – S1 energy gap (ca. 0.9 eV), slowing down the rate of S2 → S1 internal conversion. The photoluminescence behavior of the ESIPT–incapable zinc(II) coordination compounds strongly depends on the halide anion: the chlorido complex exhibits only fluorescence, the bromido complex displays a minor phosphorescence channel in addition to a major fluorescence channel, while the iodido complex exhibits predominantly phosphorescence. As a result, the emission color of the [Zn(HL4,2,Me)X2] complexes changes gradually from blue for X = Cl to orange for X = I, providing a platform for the fine-tuning of emission by the halide anion.
{"title":"Coordination-driven molecular switch on the base of an ESIPT-capable pyrimidine ligand: Synthesis, fine-tuning of emission by the halide anion and theoretical studies","authors":"Nikita A. Shekhovtsov , Elena B. Nikolaenkova , Sofia Vorobyeva , Alexey A. Ryadun , Mark B. Bushuev","doi":"10.1016/j.jphotochem.2024.116091","DOIUrl":"10.1016/j.jphotochem.2024.116091","url":null,"abstract":"<div><div>ESIPT-based materials (ESIPT = Excited State Intramolecular Proton Transfer) find diverse applications in optoelectronics and biomedicine owing to the peculiarities of their luminescence properties. Here, an ESIPT-capable compound 2-(3,5-dimethyl-1<em>H</em>-pyrazol-1-yl)-4-(2-hydroxyphenyl)pyrimidine (<strong>HL<sup>4,2,Me</sup></strong>) featuring a short O–H⋅⋅⋅N intramolecular hydrogen bond and two N,N-sites for metal binding has been synthesized. <strong>HL<sup>4,2,Me</sup></strong> is the first reported molecule which can act as an ESIPT molecular switch triggered by metal ion coordination without its deprotonation. Drastic changes in the <strong>HL<sup>4,2,Me</sup></strong> conformation in the <strong>[Zn(HL<sup>4,2,Me</sup>)X<sub>2</sub>]</strong> (X = Cl, Br,<!--> <!-->I) complexes significantly alter the photoluminescence response compared to the free ligand. In the solid state, <strong>HL<sup>4,2,Me</sup></strong> exhibits barrierless ESIPT and large Stokes-shifted yellow-orange emission due to the interplay of anti-Kasha S<sub>2</sub> → S<sub>0</sub> fluorescence and Kasha-like T<sub>1</sub> → S<sub>0</sub> phosphorescence radiative channels. The violation of Kasha’s rule for <strong>HL<sup>4,2,Me</sup></strong> is justified by an extraordinarily large S<sub>2</sub> – S<sub>1</sub> energy gap (<em>ca.</em> 0.9 eV), slowing down the rate of S<sub>2</sub> → S<sub>1</sub> internal conversion. The photoluminescence behavior of the ESIPT–incapable zinc(II) coordination compounds strongly depends on the halide anion: the chlorido complex exhibits only fluorescence, the bromido complex displays a minor phosphorescence channel in addition to a major fluorescence channel, while the iodido complex exhibits predominantly phosphorescence. As a result, the emission color of the <strong>[Zn(HL<sup>4,2,Me</sup>)X<sub>2</sub>]</strong> complexes changes gradually from blue for X = Cl to orange for X = I, providing a platform for the fine-tuning of emission by the halide anion.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"459 ","pages":"Article 116091"},"PeriodicalIF":4.1,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539799","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 : 2024-10-18DOI: 10.1016/j.jphotochem.2024.116093
Yifan Wang , Haoran Cheng , Ze Cheng , Gongliang Zhang , Hongman Hou , Jingran Bi , Shuang Yan , Hongshun Hao
In this paper, an ultrasensitive photoelectric chemical sensor based on AgBiS2 and Ag/g-C3N4 was prepared for the detection of Salmonella enteritidis (SE). The AgBiS2 and Ag/g-C3N4 were modified on FTO by layer modification to increase the photoelectric activity of the electrode, the gold nanoparticles continued to be modified, and the aptamer of SE was fixed by AuS bond to realize the specific detection of SE. Compared with the AgBiS2-modified electrode, the electrode prepared by the composite material produced a significantly enhanced and stable photocurrent signal under Xe lamp irradiation. The detection limit of sensor was 2.18 CFU/mL, and ideally, the concentration of SE detection would show a good linear relationship between 6.72 × 103 CFU/mL and 6.72 × 108 CFU/mL. The constructed photoelectrochemical sensor has strong sensitivity, wide linear range, and good selectivity for potential pathogenic bacteria. Therefore, this study provides a very promising photoelectric chemical platform for the detection of SE.
{"title":"Sensitive photoelectrochemical aptasensing of Salmonella enteritidis based on AgBiS2 and Ag/g-C3N4 with gold nanoparticles","authors":"Yifan Wang , Haoran Cheng , Ze Cheng , Gongliang Zhang , Hongman Hou , Jingran Bi , Shuang Yan , Hongshun Hao","doi":"10.1016/j.jphotochem.2024.116093","DOIUrl":"10.1016/j.jphotochem.2024.116093","url":null,"abstract":"<div><div>In this paper, an ultrasensitive photoelectric chemical sensor based on AgBiS<sub>2</sub> and Ag/g-C<sub>3</sub>N<sub>4</sub> was prepared for the detection of <em>Salmonella enteritidis</em> (SE). The AgBiS<sub>2</sub> and Ag/g-C<sub>3</sub>N<sub>4</sub> were modified on FTO by layer modification to increase the photoelectric activity of the electrode, the gold nanoparticles continued to be modified, and the aptamer of SE was fixed by Au<img>S bond to realize the specific detection of SE. Compared with the AgBiS<sub>2</sub>-modified electrode, the electrode prepared by the composite material produced a significantly enhanced and stable photocurrent signal under Xe lamp irradiation. The detection limit of sensor was 2.18 CFU/mL, and ideally, the concentration of SE detection would show a good linear relationship between 6.72 × 10<sup>3</sup> CFU/mL and 6.72 × 10<sup>8</sup> CFU/mL. The constructed photoelectrochemical sensor has strong sensitivity, wide linear range, and good selectivity for potential pathogenic bacteria. Therefore, this study provides a very promising photoelectric chemical platform for the detection of SE.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"459 ","pages":"Article 116093"},"PeriodicalIF":4.1,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539796","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}
This paper aims to achieve high-quality utilization of desulfurization waste liquid mixed salt. CN-MIX was prepared through pyrolysis of a mixture containing ammonium thiocyanate, ammonium thiosulfate, and ammonium sulfate. Additionally, CN-MIX/Co-a was produced via an impregnation-pyrolysis method with cobalt modification. The performance of the photocatalysts was evaluated using the formaldehyde degradation rate as an index, and their stability was tested. The results indicate that the specific surface area and pore volume of CN-MIX/Co-a increase by 1.53-fold and 1.44-fold, respectively, compared to CN prepared from single salt. The cobalt loading inhibits the thermal polymerization of CN-MIX, leading to a reduction in the intensity of the (0 0 2) crystal diffraction peaks. Additionally, CN-MIX/Co-a exhibits an increase in the CN peak at 2000–2200 cm−1, generating more photocatalytic active sites. The absorption sideband in the visible range red-shifts from 429 nm to 458 nm, broadening the photoresponse range. The emission peak in the photoluminescence (PL) diagram decreases, reducing the photogenerated electron-hole recombination rate. The photocatalyst demonstrates enhanced photocatalytic degradation of formaldehyde gas, with the degradation rate of CN-MIX/Co-a increasing from 13.28 % to 99.2 %. Furthermore, after eight cycles of use, the degradation efficiency of CN-MIX/Co-a for formaldehyde remains above 90 %, indicating high stability.
{"title":"Preparation of g-C3N4 from mixed ammonium salts containing NH4SCN and characterization of its cobalt-modified photocatalytic degradation of formaldehyde","authors":"Xuejun Wang, Mai Wei, Liwei Ma, Shaonan Shan, Guoqiang Li, Xiaozhong Wang, Guojie Zhang","doi":"10.1016/j.jphotochem.2024.116097","DOIUrl":"10.1016/j.jphotochem.2024.116097","url":null,"abstract":"<div><div>This paper aims to achieve high-quality utilization of desulfurization waste liquid mixed salt. CN-MIX was prepared through pyrolysis of a mixture containing ammonium thiocyanate, ammonium thiosulfate, and ammonium sulfate. Additionally, CN-MIX/Co-a was produced via an impregnation-pyrolysis method with cobalt modification. The performance of the photocatalysts was evaluated using the formaldehyde degradation rate as an index, and their stability was tested. The results indicate that the specific surface area and pore volume of CN-MIX/Co-a increase by 1.53-fold and 1.44-fold, respectively, compared to CN prepared from single salt. The cobalt loading inhibits the thermal polymerization of CN-MIX, leading to a reduction in the intensity of the (0<!--> <!-->0<!--> <!-->2) crystal diffraction peaks. Additionally, CN-MIX/Co-a exhibits an increase in the C<img>N peak at 2000–2200 cm<sup>−1</sup>, generating more photocatalytic active sites. The absorption sideband in the visible range red-shifts from 429 nm to 458 nm, broadening the photoresponse range. The emission peak in the photoluminescence (PL) diagram decreases, reducing the photogenerated electron-hole recombination rate. The photocatalyst demonstrates enhanced photocatalytic degradation of formaldehyde gas, with the degradation rate of CN-MIX/Co-a increasing from 13.28 % to 99.2 %. Furthermore, after eight cycles of use, the degradation efficiency of CN-MIX/Co-a for formaldehyde remains above 90 %, indicating high stability.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"459 ","pages":"Article 116097"},"PeriodicalIF":4.1,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539797","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 : 2024-10-18DOI: 10.1016/j.jphotochem.2024.116092
Hadi Rostamipoor , Hanie Ahmadi , Vahid Haddadi-Asl , Majid Moussaei , Hossein Roghani-Mamaqani
Both human health and marine life are seriously threatened by crude oil spills into bodies of water. For effective crude oil spill cleaning, we created a magnetic polystyrene (m-PS) nanocomposite. The use of magnetic nanoparticles makes crude oil absorption more environmentally friendly by making it easier to collect and recycle using an external magnetic field. To make Fe3O4 nanoparticles compatible with the hydrophobic styrene monomer used in emulsion polymerization, they were treated using a hydrophobic surface modification reaction. This alteration facilitated the grafting of polystyrene (PS) chains onto the nanoparticles, which then underwent emulsion polymerization. As an emulsifier, a light-responsive amphiphilic block copolymer containing coumarin was created via reversible addition-fragmentation chain transfer polymerization. This allowed for regulated emulsification and demulsification in response to UV stimulation. The synthesized m-PS nanocomposite demonstrated a crude oil absorption capacity of up to 2.31 times of its own weight, indicating its high efficiency for crude oil spill cleanup. The synthetic emulsifier exhibited a significantly lower critical micelle concentration compared to the commercial P105 emulsifier (0.0976 against 0.354 mg/mL, respectively), indicating higher efficiency and reduced environmental impact. For a more thorough comprehension of the reported results, we also assessed the Hofmeister effect in PS produced using commercial and synthetic emulsifiers.
{"title":"Synthesis of magnetic polystyrene nanocomposite by emulsion polymerization using a photo-responsive emulsifier for efficient crude oil absorption","authors":"Hadi Rostamipoor , Hanie Ahmadi , Vahid Haddadi-Asl , Majid Moussaei , Hossein Roghani-Mamaqani","doi":"10.1016/j.jphotochem.2024.116092","DOIUrl":"10.1016/j.jphotochem.2024.116092","url":null,"abstract":"<div><div>Both human health and marine life are seriously threatened by crude oil spills into bodies of water. For effective crude oil spill cleaning, we created a magnetic polystyrene (m-PS) nanocomposite. The use of magnetic nanoparticles makes crude oil absorption more environmentally friendly by making it easier to collect and recycle using an external magnetic field. To make Fe<sub>3</sub>O<sub>4</sub> nanoparticles compatible with the hydrophobic styrene monomer used in emulsion polymerization, they were treated using a hydrophobic surface modification reaction. This alteration facilitated the grafting of polystyrene (PS) chains onto the nanoparticles, which then underwent emulsion polymerization. As an emulsifier, a light-responsive amphiphilic block copolymer containing coumarin was created via reversible addition-fragmentation chain transfer polymerization. This allowed for regulated emulsification and demulsification in response to UV stimulation. The synthesized m-PS nanocomposite demonstrated a crude oil absorption capacity of up to 2.31 times of its own weight, indicating its high efficiency for crude oil spill cleanup. The synthetic emulsifier exhibited a significantly lower critical micelle concentration compared to the commercial P105 emulsifier (0.0976 against 0.354 mg/mL, respectively), indicating higher efficiency and reduced environmental impact. For a more thorough comprehension of the reported results, we also assessed the Hofmeister effect in PS produced using commercial and synthetic emulsifiers.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"459 ","pages":"Article 116092"},"PeriodicalIF":4.1,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539837","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 : 2024-10-17DOI: 10.1016/j.jphotochem.2024.116087
Devarajan Alagarasan , S.S. Hegde , R. Naik , Hitha D. Shetty , H.B. Shiva Prasad , Thamraa Alshahrani , S. AlFaify , Mohd. Shkir
To evade potential health hazards associated with exposure to NH3, there has been an increasing demand for efficient gas sensors operating at room temperature (RT). In this study, thin films of Tb-doped (0–5 wt%) WO3 synthesized by spray pyrolysis technique are used as a novel material for sensing NH3 gas. The X-ray diffraction (XRD) pattern identified the hexagonal crystal system of WO3 films and increased crystallinity for the 2 wt% Tb-doing concentration. Field emission scanning electron microscopy (FE-SEM) unveiled the distinct surface morphology of mesh-like porous structures for Tb-doped films suitable for the target gas adsorption/desorption process. Multiple photoluminescence (PL) emission peaks indicate the presence of defect states, including defect energy levels created by oxygen vacancies (Ov). Optical analysis indicated shrinkage of the bandgap of WO3 thin films for doping levels up to 2 wt%. Among all gas sensors, 2 wt% Tb-doped WO3 exhibited exceptionally high response and low response time at 250 ppm NH3 concentrations measured at room temperature (RT). The sensor’s performance for NH3 gas sensing is compared with previous reports on WO3-based NH3 sensors. The gas sensing mechanism in WO3 is also briefly discussed.
{"title":"Remarkable NH3 gas sensing performance of spray deposited Tb doped WO3 thin films at room temperature","authors":"Devarajan Alagarasan , S.S. Hegde , R. Naik , Hitha D. Shetty , H.B. Shiva Prasad , Thamraa Alshahrani , S. AlFaify , Mohd. Shkir","doi":"10.1016/j.jphotochem.2024.116087","DOIUrl":"10.1016/j.jphotochem.2024.116087","url":null,"abstract":"<div><div>To evade potential health hazards associated with exposure to NH<sub>3</sub>, there has been an increasing demand for efficient gas sensors operating at room temperature (RT). In this study, thin films of Tb-doped (0–5 wt%) WO<sub>3</sub> synthesized by spray pyrolysis technique are used as a novel material for sensing NH<sub>3</sub> gas. The X-ray diffraction (XRD) pattern identified the hexagonal crystal system of WO<sub>3</sub> films and increased crystallinity for the 2 wt% Tb-doing concentration. Field emission scanning electron microscopy (FE-SEM) unveiled the distinct surface morphology of mesh-like porous structures for Tb-doped films suitable for the target gas adsorption/desorption process. Multiple photoluminescence (PL) emission peaks indicate the presence of defect states, including defect energy levels created by oxygen vacancies (O<sub>v</sub>). Optical analysis indicated shrinkage of the bandgap of WO<sub>3</sub> thin films for doping levels up to 2 wt%. Among all gas sensors, 2 wt% Tb-doped WO<sub>3</sub> exhibited exceptionally high response and low response time at 250 ppm NH<sub>3</sub> concentrations measured at room temperature (RT). The sensor’s performance for NH<sub>3</sub> gas sensing is compared with previous reports on WO<sub>3</sub>-based NH<sub>3</sub> sensors. The gas sensing mechanism in WO<sub>3</sub> is also briefly discussed.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"459 ","pages":"Article 116087"},"PeriodicalIF":4.1,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539795","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 : 2024-10-17DOI: 10.1016/j.jphotochem.2024.116096
Nazish Parveen , Sajid Ali Ansari , Kholoud M. Alnahdi , Hassan H. Hammud , Waleed A. Aljamhi , Mir Waqas Alam , Syed Farooq Adil , Wail Al Zoubi
An innovative, eco-friendly method has been developed to synthesize reduced graphene oxide (rGO) sheets using orange peel extract. Following this, TiO2 nanoparticles are anchored to the rGO sheets through a hydrothermal process, resulting in an rGO/TiO2 nanocomposite (GTO/NC). This study utilized standard characterization techniques to confirm the formation of GTO/NC-1 and GTO/NC-2. Comparative analysis demonstrated that orange peel extract exhibits reducing capabilities compared to other natural reducers. The resulting GTO/NC-1 and GTO/NC-2, specifically GTO/NC-2, enhanced catalytic performance in degrading methyl orange a prevalent organic pollutant in various industrial applications. This nanocomposite achieved a turnover frequency of 0.003 mg MO/mg catalyst/min and displayed remarkable durability, enduring 3.0 cycles with robust first-order rate constants of 0.0193 min−1. Additionally, the electrochemical properties of GTO/NC-1 and GTO/NC-2 as electrode materials were assessed, revealing a specific capacitance of 320.0 Fg−1 at a current density of 1.0 Ag−1 and maintaining about 86.8 % of its initial capacitance after various charge–discharge cycles. These properties highlight the potential of GTO/NC-1 and GTO/NC-2 as both efficient catalysts for environmental remediation and durable materials for energy storage applications, offering substantial benefits for sustainable technology solutions.
{"title":"Eco-friendly synthesis and applications of graphene-titanium dioxide nanocomposites for pollutant degradation and energy storage","authors":"Nazish Parveen , Sajid Ali Ansari , Kholoud M. Alnahdi , Hassan H. Hammud , Waleed A. Aljamhi , Mir Waqas Alam , Syed Farooq Adil , Wail Al Zoubi","doi":"10.1016/j.jphotochem.2024.116096","DOIUrl":"10.1016/j.jphotochem.2024.116096","url":null,"abstract":"<div><div>An innovative, eco-friendly method has been developed to synthesize reduced graphene oxide (rGO) sheets using orange peel extract. Following this, TiO<sub>2</sub> nanoparticles are anchored to the rGO sheets through a hydrothermal process, resulting in an rGO/TiO<sub>2</sub> nanocomposite (GTO/NC). This study utilized standard characterization techniques to confirm the formation of GTO/NC-1 and GTO/NC-2. Comparative analysis demonstrated that orange peel extract exhibits reducing capabilities compared to other natural reducers. The resulting GTO/NC-1 and GTO/NC-2, specifically GTO/NC-2, enhanced catalytic performance in degrading methyl orange a prevalent organic pollutant in various industrial applications. This nanocomposite achieved a turnover frequency of 0.003 mg MO/mg catalyst/min and displayed remarkable durability, enduring 3.0 cycles with robust first-order rate constants of 0.0193 min<sup>−1</sup>. Additionally, the electrochemical properties of GTO/NC-1 and GTO/NC-2 as electrode materials were assessed, revealing a specific capacitance of 320.0 Fg<sup>−1</sup> at a current density of 1.0 Ag<sup>−1</sup> and maintaining about 86.8 % of its initial capacitance after various charge–discharge cycles. These properties highlight the potential of GTO/NC-1 and GTO/NC-2 as both efficient catalysts for environmental remediation and durable materials for energy storage applications, offering substantial benefits for sustainable technology solutions.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"459 ","pages":"Article 116096"},"PeriodicalIF":4.1,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539798","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}
Sensors for selective and sensitive detection of nitroaromatic (NAC) explosives are of current interest for both national security and environmental protection. In this work, three thienothiophene based AIE active materials (TPE2-TT, TPE3-TT and TPE3-TPA-TT), possessing tetraphenylethylene and triphenylamine units, were designed and synthesized as chemosensors for sensitively detecting 2,4,6-trinitrotoluene (TNT), 2,4-dinitrotoluene (DNT) and trinitrophenol (TNP) explosives. Among the AIEgens, TPE3-TT demonstrated a maximum Stern-Volmer constant (Ksv) reaching to 2.9 x 104 M−1 by quenching response toward TNP. They exhibited vivid visual quenching on absorbent papers. Moreover, probe-explosive complex interactions and their mechanisms were investigated using density functional theory (DFT). Their remarkable properties indicated that TT based AIEgens are promising probes for sensitively detecting the explosives, which provided a new source of potential leading to new designs for detection of explosives.
{"title":"Thienothiophene based AIE-Active bulky materials for sensitive explosive detection","authors":"Recep Isci , Bleda Can Sadikogullari , Berkay Sütay , Bunyamin Karagoz , Ayse Daut Ozdemir , Turan Ozturk","doi":"10.1016/j.jphotochem.2024.116095","DOIUrl":"10.1016/j.jphotochem.2024.116095","url":null,"abstract":"<div><div>Sensors for selective and sensitive detection of nitroaromatic (NAC) explosives are of current interest for both national security and environmental protection. In this work, three thienothiophene based AIE active materials (TPE2-TT, TPE3-TT and TPE3-TPA-TT), possessing tetraphenylethylene and triphenylamine units, were designed and synthesized as chemosensors for sensitively detecting 2,4,6-trinitrotoluene (TNT), 2,4-dinitrotoluene (DNT) and trinitrophenol (TNP) explosives. Among the AIEgens, TPE3-TT demonstrated a maximum Stern-Volmer constant (K<sub>sv</sub>) reaching to 2.9 x 10<sup>4</sup> M<sup>−1</sup> by quenching response toward TNP. They exhibited vivid visual quenching on absorbent papers. Moreover, probe-explosive complex interactions and their mechanisms were investigated using density functional theory (DFT). Their remarkable properties indicated that TT based AIEgens are promising probes for sensitively detecting the explosives, which provided a new source of potential leading to new designs for detection of explosives.</div></div>","PeriodicalId":16782,"journal":{"name":"Journal of Photochemistry and Photobiology A-chemistry","volume":"459 ","pages":"Article 116095"},"PeriodicalIF":4.1,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142539842","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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