Article
Engineering, Electrical & Electronic
Abdullah Sami Mutlag, Ezzat Rafiee, Maryam Khodayari, Sara Eavani
Summary: TiO2/RGO/MoS2 nanocomposite has been synthesized and proven as a high performance photocatalyst in wastewater treatment. The fabrication of an efficient photoreactor and the optimization of various parameters have been studied. The nanocomposite showed excellent photocatalytic degradation and disinfection capabilities.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Environmental Sciences
Maressa Maria de Melo Santos Moura, Graziele Elisandra do Nascimento, Deivson Cesar Silva Sales, Joan Manuel Rodriguez-Diaz, Otidene Rossiter Sa da Rocha, Marta Maria Menezes Bezerra Duarte
Summary: This paper describes the development of a recirculating photocatalytic reactor with UV-C radiation and TiO2 supported on polystyrene films obtained from post-consumer packaging. The dye mixture of brilliant blue and erythrosine used in the food industry was treated by UV/H2O2, UV/H2O2/TiO2-suspension, and UV/H2O2/TiO2-supported processes. A degradation of 100% was achieved after 390 min for 9.2 mmol.L-1 of H2O2 when using the TiO2 supported (333 mg.L-1). The catalytic and non-catalytic mathematical models had a good fit for the experimental data, in the case of the recirculating photocatalytic reactor operating a first-order catalytic reaction. The material used as a support is an easily available residue. The good performance of the reactor developed suggests that it could be used in the degradation of organic components.
WATER AIR AND SOIL POLLUTION
(2022)
Article
Energy & Fuels
Naomi Harrisankar, Pieter Levecque, Eric van Steen
Summary: The introduction of catalyst coated optical fibre in photocatalytic reactor systems can improve illumination efficiency, but requires a large amount of coated fibre. The automated optical fibre catalyst coating process has been developed to influence coating thickness and surface morphology.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2021)
Article
Engineering, Chemical
Lucia del C. Cid, Claudia M. C. Vera, Patricio A. Sorichetti
Summary: This work presents a model of an annular batch slurry photocatalytic reactor using titanium dioxide at high concentrations and near-neutral pH. The model considers factors such as catalyst particle agglomeration and adsorption/desorption equilibrium, and was validated with measurements and simulations to find optimal design criteria at high catalyst concentrations. The mathematical model is simple and robust, suitable for design and scaling of photocatalytic reactors.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
H. Zangeneh, A. A. Zinatizadeh, S. Nazari, M. Joshaghani, S. Zinadini, L. Sibali, M. Feyzi
Summary: In this study, a visible-driven nanocomposite was prepared for photocatalytic degradation of azo dye. The reaction conditions were optimized and the effects of various factors on the degradation process were investigated. The results showed that the prepared nanocomposite exhibited efficient photocatalytic performance and could be reused.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Engineering, Chemical
Mohammad Hossein Barzegar, Mohammad Mehdi Sabzehmeidani, Mehrorang Ghaedi, Vahid Madadi Avargani, Zohreh Moradi, Vellaisamy A. L. Roy, Hadi Heidari
Summary: The study focused on the synthesis of step-scheme (S-scheme) g-C3N4/TiO2 heterojunction and expressed mathematical relationships among variables in the photocatalytic degradation process using composite central design. The results showed that the photocatalytic activity of g-C3N4/TiO2 was higher than pure TiO2 and g-C3N4, demonstrating a good degradation performance.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2021)
Article
Engineering, Environmental
Jessica de Matos Fonseca, Sandra M. Miranda, Joana P. Monteiro, Regina de Fatima Peralta Muniz Moreira, German Ayala Valencia, Alcilene Rodrigues Monteiro, Vitor J. P. Vilar
Summary: This study investigated the oxidation of ethylene using TiO2 photocatalysis in a mili-photoreactor, aiming to develop a clean postharvest technology. The results showed that the catalyst loading, deposition surface, and feed stream humidity strongly influenced the ethylene conversion and reaction rate.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Physical
Abhishek Sraw, Taranjeet Kaur, Ina Thakur, Anoop Verma, Ravinder K. Wanchoo, Amrit Pal Toor
Summary: In this study, monocrotophos pesticides in water were successfully degraded by optimizing parameters such as light conditions and dopant concentration in slurry and fixed bed reactors.
JOURNAL OF MOLECULAR STRUCTURE
(2022)
Article
Instruments & Instrumentation
Luis Arce-Saldana, Gerardo Soto, Jose Romo Herrera, Andrey Simakov, Uriel Caudillo Flores
Summary: In this study, a compact device was designed for in situ spectrophotometric measurements of photocatalytic reactions using Light Emitting Diode technology and was integrated with Ultraviolet-Visible spectrophotometers. Test results for the breakdown of amaranth dye were presented using this device and compared with results obtained from a conventional arc discharge reactor. The reaction constants obtained using the device were practically equivalent to those acquired with the conventional reactor, simplifying the experimental task and enabling in situ monitoring of the reaction kinetics.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Engineering, Environmental
Reza Shahbazi, Mona Zamani Pedram
Summary: A novel photocatalytic continuous system has been proposed for treating tannery waste water, utilizing TiO2-coated surface activated by UV-light and FeCl3 as a coagulation agent. The process successfully degraded organic and inorganic compounds, as well as microorganisms in the waste water, leading to significant reduction in total dissolved solids and total suspended solids contents after treatment.
WATER SCIENCE AND TECHNOLOGY
(2021)
Article
Biochemistry & Molecular Biology
Cristina Jimenez-Holgado, Paola Calza, Debora Fabbri, Federica Dal Bello, Claudio Medana, Vasilios Sakkas
Summary: This study found that indirect photolysis may play an important role in the degradation of citalopram in aquatic environments. TiO2-mediated photocatalytic degradation can effectively remove citalopram and its transformation products from water. Toxicity assessment using Microtox bioassay and in silico tests revealed the formation of harmful compounds during citalopram photo-transformation.
Article
Multidisciplinary Sciences
K. Dhanalekshmi, P. Magesan, M. J. Umapathy, Xiang Zhang, N. Srinivasan, K. Jayamoorthy
Summary: This study synthesized chitosan and garlic loaded CdO-TiO2 hybrid nanocomposites for photocatalytic water treatment and photodynamic cancer therapy, with garlic-loaded nanocomposites demonstrating superior photocatalytic and photodynamic activity compared to chitosan-loaded and plain nanocomposites.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Physical
Daniel Olivo-Alanis, Alcione Garcia-Gonzalez, Miguel Angel Mueses, Refugio Bernardo Garcia-Reyes
Summary: A novel kinetic model was developed to predict the photocatalytic degradation of wastewater. The model takes into account the generation of reactive oxygen species, the rate of electron-hole pair generation, and the impact of reactive oxygen species on pollutants. The model demonstrated robustness and high accuracy under various operational conditions.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Food Science & Technology
Caiping Huang, Bangzhu Peng
Summary: A high-performance nitrogen-doped chitosan-TiO2 nanocomposite was successfully prepared by a simple precipitation method and showed significant photocatalytic activities for the degradation of patulin in apple juice. The nanocomposite effectively degraded patulin within 35 minutes under ultraviolet irradiation, with little impact on the quality of apple juice.
LWT-FOOD SCIENCE AND TECHNOLOGY
(2021)
Review
Chemistry, Physical
Aayush Gupta, Blaz Likozar, Runia Jana, Wairakpam Chinglembi Chanu, Mahesh Kumar Singh
Summary: Renewable energy plays a vital role in the strategies of decarbonization, decentralization, and the digitalization of energy. The current global climate, health, and economic conditions demand the use of renewable energy and the development of novel materials for efficient generation, storage, and transportation. Hydrogen is recognized as one of the most important green energy sources and carriers, but its storage presents challenges. Photocatalytic green hydrogen production processes focus on intensifying separated solar energy harvesting, storage, and electrolysis. However, research on reactor unit design, optimization, and scaling, be it material or operation-related, is limited. This study compares various materials and provides an overview of prominent pilot systems.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Environmental Sciences
Marina Duplancic, Vesna Tomasic, Zoran Gomzi
ENVIRONMENTAL TECHNOLOGY
(2018)
Article
Materials Science, Ceramics
Marina Duplancic, Vjeran Gomzi, Albin Pintar, Stanislav Kurajica, Vesna Tomasic
Summary: This study conducted detailed experimental and theoretical investigations on manganese-based metal oxides as potential catalysts for low-temperature toluene oxidation. It was found that MnFeOx exhibited superior and stable catalytic activity, with a good correlation between predicted binding energy of toluene adsorption and experimentally determined catalytic activities. Additionally, a one-dimensional pseudo-homogeneous model was used to describe the behavior of the fixed bed reactor.
CERAMICS INTERNATIONAL
(2021)
Article
Environmental Sciences
Katarina Licht, Vanja Kosar, Vesna Tomasic, Marina Duplancic
Summary: This study investigated the photocatalytic degradation of acetamiprid in water. Modification of TiO2-P25 photocatalyst improved the degradation efficiency. The results showed that the initial concentration of acetamiprid is the key factor in the photocatalytic degradation process.
ENVIRONMENTAL TECHNOLOGY
(2023)
Article
Chemistry, Organic
Cui-Bing Bai, Lei-Yang Zhang, Nai-Xing Wang, Zhan Yan, Yue-Hua Wu, Bao-Cai Xu, Ning Liu, Bo-Zhou Wang, Vesna Tomasic
Summary: A new type of NADH model compound with six asymmetric carbon centers has been synthesized using an efficient and convenient method. The combination of NADH models and enzymes was used for asymmetric reduction, and it was the first time that dehydrogenase was used instead of inorganic catalysts like MgCl2. Additionally, experimental results showed that the new NADH model exhibited the strongest fluorescence emission properties compared to previous models.
LETTERS IN ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Vanja Kosar, Filip Kurt, Vesna Tomasic, Ivana Elizabeta Zelic
Summary: The photocatalytic degradation of the neonicotinoid insecticide acetamiprid was studied using UVA-LED radiation source and TiO2 nanoparticles in a batch slurry system. The experimental results showed that radiation intensity had the greatest influence on the efficiency of the photocatalytic degradation of acetamiprid.
REACTION KINETICS MECHANISMS AND CATALYSIS
(2021)
Article
Engineering, Manufacturing
Filip Car, Gabriela Brnadic, Vesna Tomasic, Domagoj Vrsaljko
Summary: This study investigates the feasibility of producing monolithic catalysts for degrading aromatic volatile organic compounds using 3D-printing technology. Two different approaches were used to produce ceramic catalyst carriers and polymer composite monoliths. Optimal printing conditions were determined for both types of monoliths, and successful fabrication was achieved.
PROGRESS IN ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Ceramics
Andreja Zuzic, Filip Car, Jelena Macan, Vesna Tomasic, Andreja Gajovic
Summary: Strontium-doped lanthanum manganites (LSMO) are promising and affordable catalysts for oxidative degradation of volatile organic compounds. Catalysts prepared by different methods have similar morphology and porosity, but different pore size distribution.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Article
Biotechnology & Applied Microbiology
Marina Duplancic, Kristina Liber, Ivana Elizabeta Zelic, Vanja Kosar, Vesna Tomasic
Summary: This research focuses on the photocatalytic degradation of the neonicotinoid insecticide imidacloprid using nitrogen-doped TiO2 as the photocatalyst. The results showed that irradiance was the most significant factor in the process.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Dragana Vuk, Floren Radovanovic-Peric, Vilko Mandic, Vilma Lovrincevic, Thomas Rath, Ivana Panzic, Jerome Le-Cunff
Summary: Necessary advancements in the area of organic photovoltaic devices include improving power conversion efficiency and stability. This study focuses on the development of new small molecule absorbers called squaraines (SQs) as donors in organic solar cells. By optimizing the structure of the SQs, compatibility and favorable organization of the donor and acceptor in the absorber layer can be achieved. Novel alkyl- and benzyl-substituted aryl aminosquaraines were successfully synthesized through an improved and eco-friendly procedure. The SQs were characterized and compared with bulk heterojunction thin films, revealing differences in domain organization and orientation.
Article
Engineering, Chemical
Ivana Elizabeta Zelic, Vesna Tomasic, Zoran Gomzi
Summary: The aim of this study was to develop a new rotating photocatalytic reactor and improve the efficiency of the degradation process by exploring the influence of rotational hydrodynamics and applying process intensification methodology. The homemade photoreactor was used for the photocatalytic degradation of acetamiprid, a type of neonicotinoid insecticide.
INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING
(2023)
Review
Engineering, Chemical
Amra Bratovcic, Vesna Tomasic
Summary: This review presents the results of research in the field of photocatalytic reduction of carbon dioxide (CO2) to methane and methanol as valuable chemicals and fuels. The main challenges in this research area are the development of an active and selective catalyst for the photoreduction of CO2 to useful products with high added value and the optimization and development of a suitable photoreactor. This review is intended to provide guidance for the future development of advanced photocatalysts and photocatalytic systems for CO2 reduction and to enable further breakthroughs in this field.
Article
Engineering, Chemical
Lucija Bogdan, Ana Palcic, Marina Duplancic, Mirela Leskovac, Vesna Tomasic
Summary: The aim of this study was to develop hybrid TiO2/ZIF-8 photocatalysts for removing agricultural pollutants from water. The photocatalysts were synthesized using a hydrothermal method with mechanochemically synthesized ZIF-8 and titanium tetraisopropoxide as precursors. Three composite photocatalysts with different mass fractions of TiO2 were prepared and characterized. The hybrid photocatalysts showed lower adsorption efficiency compared to ZIF-8, potentially due to the presence of a TiO2 layer on the surface of ZIF-8. The highest removal efficiency of imidacloprid was achieved with the hybrid photocatalysts containing 5 wt% TiO2.
Article
Engineering, Chemical
Vanja Kosar, Ana-Marija Krizanac, Ivana Elizabeta Zelic, Stanislav Kurajica, Vesna Tomasic
Summary: The aim of this study was to investigate the photocatalytic degradation of the neonicotinoid insecticide acetamiprid in aqueous solution and optimize the reaction conditions. The results showed that the conversion rate of the reaction is significantly affected by the type of catalyst, volume of the reaction mixture, and light radiation intensity.
Article
Chemistry, Multidisciplinary
I. E. Zelic, V Gilja, I Grcic, V Tomasic
Summary: The global economic crisis has prompted reconsideration of the importance of reindustrialization, with a focus on environmental preservation, energy conservation, and human health in the development of future industries. Process intensification, a new approach in chemical engineering, is emerging as a key factor in the advancement of integrated, safer, more energy efficient, and environmentally friendly technologies. This paper provides examples of advanced photocatalytic reactors developed using process intensification methodology, highlighting the potential for addressing global environmental challenges such as water and wastewater treatment.
KEMIJA U INDUSTRIJI-JOURNAL OF CHEMISTS AND CHEMICAL ENGINEERS
(2021)
Article
Engineering, Environmental
Kristina Babic, Vesna Tomasic, Vanja Gilja, Jerome Le Cunff, Vjeran Gomzi, Albin Pintar, Gregor Zerjav, Stanislav Kurajica, Marina Duplancic, Ivana Elizabeta Zelic, Tomislava Vukusic Pavicic, Ivana Grcic
Summary: This study demonstrates the effectiveness of TiO2 photocatalysts modified by defect engineering methods. The immobilized photocatalyst layer was prepared and tested for the degradation of imidacloprid in an aqueous solution. The study investigated the effects of different operating variables on the photocatalytic performances, studied the hydrodynamic behavior of the flat-plate photoreactor, and proposed a possible pathway for the photodegradation of imidacloprid in aqueous phase after irradiation with UVA.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Wiem Bouali, Muejgan Yaman, Nurgul Seferogu, Zeynel Seferogu
Summary: Novel chemosensors, including coumarin hydrazide, were synthesized and demonstrated the ability to detect cyanide ions through absorption and fluorescence turn-off response. The reaction mechanism between the sensors and the ions was determined through experimental and theoretical studies. The sensors exhibited high detection ability and effectiveness.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
Parinaz Abdollahian, Hassan Heidari, Soheila Hassanzadeh, Mohammad Hasanzadeh
Summary: This study successfully synthesized various types of thiolated-graphene quantum dots (GQDs) and utilized them in a one-droplet microfluidic paper-based analytical device for the simultaneous multi-sensing of heavy metal ions. The GQDs were functionalized and stabilized on the surface of hydrophobic fiber-glass, enabling colorimetric chemosensing of ions including iron, copper, cobalt, mercury, chrome, manganese, and nickel. The results were confirmed using fluorescence spectrometry, and the platform showed potential for facile metal ion detection in human urine models and environmental fluids.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
S. L. Barrett, C. Meyer, E. Cwiklik, V Fieglein, M. Burns, J. Guerrero, W. J. Brittain
Summary: Laboratory illumination is strong enough to create a photostationary state (PSS) of amphiphilic azo-benzene compounds in water. The [cis]PSS/[trans]PSS ratios were observed to be 0.33-1.2 in D2O and 0.37-3.8 in dimethyl sulfoxide-d6. ortho-Fluoroazobenzene amphiphiles show higher cis-isomer concentration at equilibrium compared to non-fluorinated compounds due to differences in optical absorption profiles. The kinetics of isomerization were measured using UV-Vis spectroscopy and the ratio of trans-to-cis rates does not directly correlate with the observed PSS. The half-life for PSS formation is 40 minutes for fluorinated compounds and 80 minutes for non-fluorinated compounds.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
Jalil Khodayari, Karim Zare, Omid Moradi, Mohammadreza Kalaee, Niyaz Mohammad Mahmoodi
Summary: In this study, an eco-friendly biocomposite (CMC/MIL/CuO) was synthesized and characterized, and its ability to decolorize Acid Blue 92 dye was investigated. The results showed that CMC/MIL/CuO can be used as a suitable photocatalyst for dye decolorization.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
Bo Ma, Qian Xu, Huajun Yao, Yalin Chen, Yiyang Wang, Yunfei Yang, Hongfang Shen, Youjun Lu
Summary: This study designed an integrated structure of Cu2O@Au/Cu2O heterostructure particles, which achieved significantly enhanced photocatalytic performance by simultaneously considering the integrated structural characteristics and localized surface plasmon resonance (LSPR) effect. Experimental characterization and theoretical simulation confirmed the three-in-one synergy of the integrated heterostructure, including the LSPR effect of Au nanoparticles, the light scattering based on core-shell heterostructure, and the effective charge separation based on inter-embedded heterostructure. The concept of integrated heterostructure cooperated with LSPR effect provides a new strategy for designing future catalysts.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
Robert G. H. Marks, Sarah P. Rockel, Klaus Kerpen, Holger Somnitz, Philipp R. Martin, Maik A. Jochmann, Torsten C. Schmidt
Summary: This study investigated the pH-dependent photolysis of phosphonates in aqueous solutions and analyzed the transformation products. The results showed that the photolysis rate of phosphonates was influenced by pH and light conditions. Furthermore, the carbon kinetic isotope effects varied for different types of phosphonates.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
T. M. Naren Vidaarth, S. Surendhiran, K. S. G. Jagan, S. Savitha, K. S. Balu, A. Karthik, B. Kalpana
Summary: In this study, magnesium oxide nanoparticles were synthesized using plant seed extracts, which exhibited excellent performance in removing dyes from textile water bodies. These nanoparticles also showed strong antibacterial and antioxidant properties.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
Mikhail Yu. Ovchinnikov, Vyacheslav A. Antipin, Sergey L. Khursan
Summary: In this study, the recombination of separated ion-radical states (SIRS) in PAPh films was analyzed, and it was found that the contribution of X-SIRS recombination to total luminescence varies with different environments. It was also shown that the recombination of labile SIRS is independent of the nature of the atmosphere. The study theoretically substantiated that SIRS recombination can occur via the transfer of both positive and negative charges, and the efficiency of thermal activation of recombination processes depends on the ratio of radiant and conductive channels of energy transfer.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
Sumaira Naeem, Tayyaba Mubashir, Mudassir Hussain Tahir, Jawayria Najeeb, Ahmed Z. Dewidar, Hosam O. El-ansary, Silas Lagat, Anthony Pembere
Summary: This study presents an alternative methodology using machine learning for the selection of novel organic molecules to develop high-performance organic solar cell devices.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
D. Thirumoolan, S. Ragupathy, S. Renukadevi, P. Rajkumar, Rajakumar S. Rai, R. M. Saravana Kumar, Imran Hasan, Mani Durai, Young-Ho Ahn
Summary: In this study, the photodegradation of brilliant green dye was studied in relation to the comparative photocatalytic activity of pure ZnO and Ni-doped ZnO/CSAC. The Ni-doped ZnO/CSAC showed a higher photocatalytic degradation rate under visible light irradiation, suggesting its potential as an effective wastewater treatment material.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
Ajmal Khan, Zhidong Chang, Wenjun Li, Xiaohui Ma, Mei Dong, Liang Geng, Ghulam Yasin, Shuaib Khan, Hira Anwar
Summary: Due to its functional structure and tunable shape, 2D zeolitic imidazole framework (ZIFs) have gained significant interest in various fields. In this study, thin ZIF-8 sheets were prepared using a mixed solvent and then delaminated into single layers through physical sonication. These hexagonal sheets exhibited high stability and controlled morphology, and showed excellent performance in dye degradation compared to 3D ZIF-8 crystals.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
Vitaly A. Podshibyakin, Evgenii N. Shepelenko, Leonid D. Popov, Tatyana M. Valova, Anton O. Ayt, Lyudmila G. Kuzmina, Anton V. Lisovin, Oleg N. Burov, Mikhail E. Kletskii, Alexander D. Dubonosov, Vladimir A. Bren
Summary: Bifunctional hybrids containing photochromic indolyl(thienyl) diarylethenes and an ionochromic rhodamine moiety connected by a dimethylene spacer were synthesized. These hybrids exhibit absorption at 450-455 nm and fluorescence at 560 nm in toluene. UV light triggers ring-closed non-fluorescent diarylethene formation, which can be reversed under visible light or in the dark. In the presence of H+ cation, a naked eye effect is observed with the opening of the rhodamine-spirolactam ring and a pink-crimson coloration at 561 nm accompanied by intense long-wavelength emission at 586 nm. This process is reversible by exposure to triethylamine, as confirmed by NMR experiments. The light-induced isomerizations and proton-induced transformations were explained using computational methods. Reversible switching of fluorescent properties can be achieved by light irradiation and proton.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
Majid Sharifi-Rad, Hazem S. Elshafie, Pawel Pohl
Summary: The study investigated the synthesis of silver nanoparticles using Lallemantia royleana leaf extract, characterized their physico-chemical properties, and evaluated their biopharmaceutical and catalytic applications. The synthesized nanoparticles showed good stability and exhibited higher antioxidant, antimicrobial, anti-inflammatory, anti-arthritic, and cytotoxic activities compared to the leaf extract. These results provide a promising green synthesis route for silver nanoparticles with potential biomedical and catalytic applications.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
Meera Moydeen Abdul Hameed, Badr M. Thamer
Summary: Security encoding using photochromism is an effective method for creating authentication substrates. A unique photochromic ink has been developed that emits light continuously under UV rays and darkness. The ink is produced by dispersing lanthanidedoped aluminate nanoparticles in a polymer binder. The resulting composite ink can be used to create transparent films on paper, and the stamped patterns become visible under UV rays, changing from colorless to green.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)
Article
Chemistry, Physical
Monika Lamoria, Rita Kakkar, Marilyn Daisy Milton
Summary: Four novel water-soluble benzimidazolium and bis-benzimidazolium salts with a fluorophore-spacer-receptor design were synthesized and demonstrated to selectively detect Fe3+ ions with large Stokes shifts. The binding mechanism and detection performance were investigated through theoretical and experimental studies.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2024)