1,465 results match your criteria dmpo

Interfacial chemical bond and internal electric field modulated Z-scheme S-ZnInS/MoSe photocatalyst for efficient hydrogen evolution.

Nat Commun 2021 Jul 5;12(1):4112. Epub 2021 Jul 5.

College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, Shandong, P. R. China.

Construction of Z-scheme heterostructure is of great significance for realizing efficient photocatalytic water splitting. However, the conscious modulation of Z-scheme charge transfer is still a great challenge. Herein, interfacial Mo-S bond and internal electric field modulated Z-scheme heterostructure composed by sulfur vacancies-rich ZnInS and MoSe was rationally fabricated for efficient photocatalytic hydrogen evolution. Read More

View Article and Full-Text PDF

Enhancing the Radical Scavenging Activity and UV Resistance of Lignin Nanoparticles via Surface Mannich Amination toward a Biobased Antioxidant.

Biomacromolecules 2021 06 2;22(6):2693-2701. Epub 2021 Jun 2.

The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, Jiangnan University, Wuxi 214122, China.

In recent years, lignin specific activities, such as antioxidation and antibacterial and anti-ultraviolet performance, have drawn more and more attention. Nevertheless, the insufficient radical scavenging (antioxidation) activity has become one of the main drawbacks that limits its high-value application. In this study, lignin nanoparticles (LNPs) were prepared via a facile acid treatment strategy. Read More

View Article and Full-Text PDF

Free-Radical-Mediated Formation Mechanism of Polar Polymeric Triglycerides in Vegetable Oil Studied by Electron Spin Resonance and High-Performance Liquid Chromatography.

J Agric Food Chem 2021 May 18. Epub 2021 May 18.

Oil Crops Research Institute, Hubei Key Laboratory of Lipid Chemistry and Nutrition, and Key Laboratory of Oilseeds Processing, Ministry of Agriculture, Chinese Academy of Agricultural Sciences, Wuhan, Hubei 430000, People's Republic of China.

The free-radical-mediated formation mechanism of polar polymeric triglycerides (TAGs) was derived based on the formation of lipid-derived radicals and the degradation of TAGs in palm oil (PO), rapeseed oil (RO), and sunflower oil (SO). The experimental spectra were simulated by alkoxyl, alkyl, and 5-dimethyl-1-pyrroline N-oxide (DMPO)-oxidized adducts. DMPO-oxidized adducts were the main radical adducts in the initial stage. Read More

View Article and Full-Text PDF

Non-thermal plasma-induced DMPO-OH yields hydrogen peroxide.

Arch Biochem Biophys 2021 Jul 6;705:108901. Epub 2021 May 6.

Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Showa-Ku, Nagoya, 466-8550, Japan; Center for Low-temperature Plasma Sciences, Nagoya University, Chikusa-ku, Nagoya, 464-8603, Japan. Electronic address:

Recent developments in electronics have enabled the medical applications of non-thermal plasma (NTP), which elicits reactive oxygen species (ROS) and reactive nitrogen species (RNS), such as hydroxyl radical (OH), hydrogen peroxide (HO), singlet oxygen (O), superoxide (O), ozone, and nitric oxide at near-physiological temperatures. In preclinical studies or human clinical trials, NTP promotes blood coagulation, eradication of bacterial, viral and biofilm-related infections, wound healing, and cancer cell death. To elucidate the solution-phase biological effects of NTP in the presence of biocompatible reducing agents, we employed electron paramagnetic resonance (EPR) spectroscopy to quantify OH using a spin-trapping probe, 5,5-dimethyl-1-pyrroline-N-oxide (DMPO); O using a fluorescent probe; and O and HO using luminescent probes in the presence of thiols or tempol. Read More

View Article and Full-Text PDF

An Improved System to Evaluate Superoxide-Scavenging Effects of Bioflavonoids.

ChemistryOpen 2021 04;10(4):503-514

State Key Laboratory Breeding Base of Green Pesticide & Agricultural Bioengineering, Key Laboratory of Green Pesticide & Agricultural Bioengineering, Ministry of Education, State-Local Joint Laboratory for Comprehensive Utilization of Biomass, Center for R&D of Fine Chemicals, Guizhou University, Guiyang, Guizhou, 550025, China.

The pyrogallol autoxidation method has been widely utilized to evaluate various antioxidants in antioxidative bioactivities. However, this method is generally not appropriate for estimating the O radical scavenging capacity of bioflavonoids, as it enables bioflavonoids to generate O radical in oxygen-alkaline (pH 8.2) surroundings. Read More

View Article and Full-Text PDF

Enhanced Fenton-like degradation of sulfadiazine by single atom iron materials fixed on nitrogen-doped porous carbon.

J Colloid Interface Sci 2021 Sep 1;597:56-65. Epub 2021 Apr 1.

Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, PR China; Environmental Materials and Pollution Control Laboratory, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, PR China. Electronic address:

The use of single-atom iron catalysts in heterogeneous Fenton-like reactions has demonstrated tremendous potential for antibiotic wastewater treatment. In this study, single-atom iron fixed on nitrogen-doped porous carbon materials ([email protected]) was synthesised using a metal organic framework (MOF) as a precursor. [email protected] was applied as a heterogeneous Fenton catalyst to activate HO for the degradation of sulfadiazine (SDZ) in an aqueous solution. Read More

View Article and Full-Text PDF
September 2021

Electron paramagnetic resonance of sonicated powder suspensions in organic solvents.

Ultrason Sonochem 2021 May 26;73:105544. Epub 2021 Mar 26.

Polytechnique Montréal - Department of Chemical Engineering, C.P. 6079, Centre Ville, H3C 3A7 Montréal, QC, Canada. Electronic address:

The chemical effects of the acoustic cavitation generated by ultrasound translates into the production of highly reactive radicals. Acoustic cavitation is widely explored in aqueous solutions but it remains poorly studied in organic liquids and in particular in liquid/solid media. However, several heterogeneous catalysis reactions take place in organic solvents. Read More

View Article and Full-Text PDF

Analytical Characterization of 3-MeO-PCP and 3-MMC in Seized Products and Biosamples: The Role of LC-HRAM-Orbitrap-MS and Solid Deposition GC-FTIR.

Front Chem 2020 8;8:618339. Epub 2021 Feb 8.

BeSep S.r.l., c/o Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy.

Among the phencyclidine (PCP) and synthetic cathinone analogs present on the street market, 3-methoxyphencyclidine (3-MeO-PCP) is one of the most popular dissociative hallucinogen drugs, while 3-methylmethcathinone (3-MMC) is a commonly encountered psychostimulant. Numerous 3-MeO-PCP- and 3-MMC-related intoxication cases have been reported worldwide. Identification of the positional isomers of MeO-PCP and MMC families are particularly challenging for clinical and forensic laboratories; this is mostly due to their difficult chromatographic separation (particularly when using liquid chromatography-LC) and similar mass spectrometric behaviors. Read More

View Article and Full-Text PDF
February 2021

Antioxidant vs. Prooxidant Properties of the Flavonoid, Kaempferol, in the Presence of Cu(II) Ions: A ROS-Scavenging Activity, Fenton Reaction and DNA Damage Study.

Int J Mol Sci 2021 Feb 5;22(4). Epub 2021 Feb 5.

Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology, 812 37 Bratislava, Slovakia.

Kaempferol is a flavonoid that occurs in tea and in many vegetables and fruits, including broccoli, cabbage, beans, grapes, apples, and strawberries. The efficacy of Kaempferol has been demonstrated in the treatment of breast, esophageal, cervical, ovarian, and liver cancers and leukemia, which very likely arises from its prooxidant properties and the activation of pro-apoptotic pathways. Indeed, this matter has already been the focus of a number of published studies and reviews. Read More

View Article and Full-Text PDF
February 2021

In vitro measurement of superoxide dismutase-like nanozyme activity: a comparative study.

Analyst 2021 Mar 1;146(6):1872-1879. Epub 2021 Feb 1.

Department of Biomedical Engineering, College of Engineering and Applied Sciences, Nanjing University, Nanjing, Jiangsu 210023, China.

Analyzing the SOD-like activity of nanozymes in vitro is of great importance for identifying new nanozymes and predicting their potential biological effects in vivo. However, false negative or positive results occasionally occur due to the mismatch between the detection methods and nanozymes. Here, five typical SOD-like nanozymes, including CeO, MnO, Prussian blue (PB), PCN222-Mn, and Pt NPs, have been used to evaluate the sensitivity and accuracy of several commonly used in vitro detection methods. Read More

View Article and Full-Text PDF

Radical reactions induced by ketoprofen in phospholipid membranes under ultraviolet light irradiation.

J Photochem Photobiol B 2021 Jan 23;214:112090. Epub 2020 Nov 23.

Laboratory of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Sojo University, Kumamoto 860-0082, Japan; DDS Research Institute, Sojo University, Kumamoto 860-0082, Japan. Electronic address:

2-(3-Benzoylphenyl)propanoic acid (ketoprofen), one of the nonsteroidal anti-inflammatory drugs, causes photocontact dermatitis by ultraviolet (UV) light as a side effect. In this study, we examined radical reactions induced by ketoprofen in the lipid membranes under UV irradiation using egg yolk phosphatidylcholine (egg-PC) liposomal membranes containing 5- or 16-doxyl stearic acid (5- or 16-DSA), which carry nitroxyl radical at the 5- or 16-position of the fatty acid chain, respectively. When the suspension of liposomal membrane was mixed with ketoprofen and irradiated with UV, electron spin resonance signal of 5- and 16-DSA in the membrane decreased. Read More

View Article and Full-Text PDF
January 2021

LC-HRMS characterization of the skin pigmentation and sexual enhancers melanotan II and bremelanotide sold on the black market of performance and image enhancing drugs.

Drug Test Anal 2021 Apr 16;13(4):876-882. Epub 2020 Dec 16.

Department of Healthcare Surveillance and Bioethics, Forensic Toxicology Laboratory, Università Cattolica del Sacro Cuore F. Policlinico Gemelli IRCCS, Rome, Italy.

The spread of performance and image enhancing drugs (PIEDs) often requires forensic toxicology laboratories to identify unknown compounds without reference standards. We characterized the PIEDs melanotan II and bremelanotide, not legally marketed, in eight unknown samples confiscated by police together with anabolic steroids, hormone modulators, sexual enhancers and stimulants, intended for the black market of bodybuilders, using liquid chromatography-high resolution/high accuracy Orbitrap mass spectrometry (LC-HRMS). The characterization was carried out by the accurate mass measurements of MH ionic species, the study of their isotopic patterns and the associated relative isotopic abundance (RIA) values, as well as the accurate mass measurements of collision-induced product ions obtained in fragmentation experiments. Read More

View Article and Full-Text PDF

Cannabis potency in North-East Italy: A ten-year study (2010-2019).

Forensic Sci Int 2020 Dec 21;317:110556. Epub 2020 Oct 21.

Laboratory of Environmental Hygiene and Forensic Toxicology, DMPO Department, AULSS 3 Serenissima, Venice, Italy.

This paper presents data about potency of herbal and resin cannabis products seized during 2010-2019 in north-east Italy. More than 12,000 cannabis samples were analyzed and concentrations of THC, CBD and CBN were collected. The results of our study provided clear evidence for an increase in the potency of cannabis products across the study period, which is consistent with other studies. Read More

View Article and Full-Text PDF
December 2020

Switching from healthy to unhealthy oxidative stress - does the radical type can be used as an indicator?

Free Radic Biol Med 2021 01 1;162:401-411. Epub 2020 Nov 1.

Charité - Universitätsmedizin Berlin, corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Dermatology, Venerology and Allergology, Center of Experimental and Applied Cutaneous Physiology, Berlin, Germany.

Ultraviolet (UV) radiation leads to the formation of free radicals, which may cause immunological modulations, skin aging or skin cancer. Sunlight exposure in the UVA region according to CIE 85 promotes almost 46% of radical formation in skin. A critical radical concentration characterized by the inversion of the domination of primary ROS (reactive oxygen species) to an excess of secondary LOS (lipid oxygen species) is proven for the spectral regions UV and or VIS light and is intended to be a marker for an imbalance in the redox system, which can no longer compensate harmful effects. Read More

View Article and Full-Text PDF
January 2021

Kinetic Study and Degradation Mechanism of Glycidyl Esters in both Palm Oil and Chemical Models during High-Temperature Heating.

J Agric Food Chem 2020 Dec 1;68(51):15319-15326. Epub 2020 Nov 1.

Institute for Advanced Study, Shenzhen University, Shenzhen 518060, China.

A kinetic model for glycidyl ester (GE) formation in both palm oil and chemical models during high-temperature heating was built to investigate the formation and degradation mechanisms of GEs in refined palm oil. The results showed that the formation and degradation of GEs followed pseudo-first-order reactions, and the rate constants of reaction kinetics followed the Arrhenius equation. The estimated activation energy of the GE degradation reaction (12. Read More

View Article and Full-Text PDF
December 2020

1,2,4-Triazolato paddlewheel dibismuth complexes with very short Bi(II)-Bi(II) bonds: bismuth(III) oxidation of 1,2,4-triazolato anions into neutral -1,2,4-triazolyl radicals.

Dalton Trans 2020 Nov;49(43):15190-15194

Key Laboratory of Magnetic Molecules & Magnetic information materials Ministry of Education, The School of Chemical and Materials Science, Shanxi Normal University, Linfen, Shanxi Province 04100, China.

Bismuth(iii) oxidation of 3,5-di-substituted-1,2,4-triazolato anions afforded a paddlewheel 1,2,4-triazolato dibismuth complex [L2(Bi-Bi)L2] (L = η1,η1-3,5-R2tz, R = Ph (3), iPr (4)) with very short Bi(ii)-Bi(ii) bonds (2.8650(4)-2.8721(3) Å). Read More

View Article and Full-Text PDF
November 2020

Imaging of Hydroxyl-Radical Generation Using Dynamic Nuclear Polarization-Magnetic Resonance Imaging and a Spin-Trapping Agent.

Anal Chem 2020 11 16;92(21):14408-14414. Epub 2020 Oct 16.

Department of Radiology, Gifu University, 1-1 Yanagido, Gifu 501-1194, Japan.

Reactive oxygen species (ROS) play an important role in cell metabolism, but they can cause oxidative damage to biomolecules. Among ROS, the hydroxyl radical (·OH) is one of the most reactive molecules in biological systems because of its high reaction rate constant. Therefore, imaging of ·OH could be useful for evaluation of the redox mechanism and diagnosis of oxidative diseases. Read More

View Article and Full-Text PDF
November 2020

First Direct and Unequivocal Electron Spin Resonance Spin-Trapping Evidence for pH-Dependent Production of Hydroxyl Radicals from Sulfate Radicals.

Environ Sci Technol 2020 11 16;54(21):14046-14056. Epub 2020 Oct 16.

State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, P. R. China.

Recently, the sulfate radical (SO) has been found to exhibit broad application prospects in various research fields such as chemical, biomedical, and environmental sciences. It has been suggested that SO could be transformed into a more reactive hydroxyl radical (OH); however, no direct and unequivocal experimental evidence has been reported yet. In this study, using an electron spin resonance (ESR) secondary radical spin-trapping method coupled with the classic spin-trapping agent 5,5-dimethyl-1-pyrroline -oxide (DMPO) and the typical OH-scavenging agent dimethyl sulfoxide (DMSO), we found that OH can be produced from three SO-generating systems from weakly acidic (pH = 5. Read More

View Article and Full-Text PDF
November 2020

Green tea polyphenolic antioxidants oxidize hydrogen sulfide to thiosulfate and polysulfides: A possible new mechanism underpinning their biological action.

Redox Biol 2020 10 18;37:101731. Epub 2020 Sep 18.

NIHR Southampton Biomedical Research Center, University of Southampton, Southampton, General Hospital, Southampton, SO16 6YD, UK; Clinical & Experimental Sciences, Faculty of Medicine, Southampton General Hospital, University of Southampton, Southampton, SO16 6YD, UK. Electronic address:

Matcha and green tea catechins such as (-)-epicatechin (EC), (-)-epigallocatechin (EGC) and (-)-epigallocatechin gallate (EGCG) have long been studied for their antioxidant and health-promoting effects. Using specific fluorophores for HS (AzMC) and polysulfides (SSP4) as well as IC-MS and UPLC-MS/MS-based techniques we here show that popular Japanese and Chinese green teas and select catechins all catalytically oxidize hydrogen sulfide (HS) to polysulfides with the potency of EGC > EGCG >> EG. This reaction is accompanied by the formation of sulfite, thiosulfate and sulfate, consumes oxygen and is partially inhibited by the superoxide scavenger, tempol, and superoxide dismutase but not mannitol, trolox, DMPO, or the iron chelator, desferrioxamine. Read More

View Article and Full-Text PDF
October 2020

Study of the controversial resveratrol that interact with the endogenous glutathione thiyl radical in cancer cells.

Free Radic Res 2020 Sep 13;54(8-9):687-693. Epub 2020 Oct 13.

College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, PR China.

Found in various natural food products, many evidence indicated that resveratrol (RES) has been linked to neuroprotective and cardioprotective effects and prevent cancer development. However, human clinical trials have been conducted with varying results, making the usage of RES controversial. In this paper, we demonstrated that the drug RES could be conjugated with the high levels of endogenous GS in cancer cells. Read More

View Article and Full-Text PDF
September 2020

Electron Spin Resonance Evidence for Electro-generated Hydroxyl Radicals.

Environ Sci Technol 2020 10 30;54(20):13333-13343. Epub 2020 Sep 30.

State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, P. R. China.

Electro-generated hydroxyl radicals (•OH) are of fundamental importance to the electrochemical advanced oxidation process (EAOP). Radical-specific electron spin resonance (ESR) evidence is still lacking in association with the direct electron transfer (DET) reaction of spin trap (e.g. Read More

View Article and Full-Text PDF
October 2020

Inhomogeneous generation of hydroxyl radicals in hydrogen peroxide solution induced by ultraviolet irradiation and in a Fenton reaction system.

Free Radic Res 2020 Sep 21:1-9. Epub 2020 Sep 21.

Quantitative RedOx Sensing Group, Department of Basic Medical Sciences for Radiation Damages, National Institute of Radiological Sciences, Quantum Medical Science Directorate, National Institutes for Quantum and Radiological Science and Technology, Chiba, Japan.

The density of hydroxyl radical (•OH) generation by degeneration of hydrogen peroxide (HO) during UVB irradiation and in a Fenton reaction system was estimated. The purpose of this study was to evaluate whether these reaction systems generate spatially uniform or inhomogeneous •OH from HO in the reaction mixture. A series of 5,5-dimethyl-1-pyrroline--oxide (DMPO) solutions of several concentrations (0. Read More

View Article and Full-Text PDF
September 2020

Gas Chromatography-Fourier Transform Infrared Spectroscopy for Unambiguous Determination of Illicit Drugs: A Proof of Concept.

Front Chem 2020 24;8:624. Epub 2020 Jul 24.

BeSep S.r.l., c/o Department of Chemical, Biological, Pharmaceutical and Environmental Sciences, University of Messina, Messina, Italy.

The increasing number of synthetic molecules constantly introduced into the illicit drug market poses a great demand in terms of separation and identification power of the analytical tools. Therefore, forensic laboratories are challenged to develop multiple analytical techniques, allowing for the reliable analysis of illicit drugs. This goal is accomplished by means of spectroscopy measurements, usually after a separation step, consisting of liquid (LC) or gas (GC) chromatography. Read More

View Article and Full-Text PDF

Evaluation of General Synthesis Procedures for Bioflavonoid-Metal Complexes in Air-Saturated Alkaline Solutions.

Front Chem 2020 5;8:589. Epub 2020 Aug 5.

Tongren Key Laboratory for Modernization Research, Development and Utilization of Traditional Chinese Medicine and National Medicine, School of Material and Chemical Engineering, Tongren University, Tongren, China.

The general synthesis methods of bioflavonoid-metal complexes are considered to be unreliable due to the instability of flavonoids in air-saturated alkaline solutions. In this study, dihydromyricetin (DHM), as a representative bioflavonoid, was selected for complexation with various transition metal ions in an air-saturated alkaline solution to form DHM-metal(II) complexes, following the general synthetic procedure. After characterization, the metal complexes were hydrolyzed to observe the stability of DHM under acidic conditions via HPLC. Read More

View Article and Full-Text PDF

Are Radicals Formed During Anion-Exchange Membrane Fuel Cell Operation?

J Phys Chem Lett 2020 Sep 28;11(18):7630-7636. Epub 2020 Aug 28.

Faculty of Chemistry, Jagiellonian University in Krakow, Gronostajowa 2, 30-387 Krakow, Poland.

In this paper we present a study on stable radicals and short-lived species generated in anion-exchange membrane (AEM) fuel cells (AEMFCs) during operation. The measurements are performed with a micro-AEMFC inserted into a resonator of an electron paramagnetic resonance (EPR) spectrometer, which enables separate monitoring of radicals formed on the anode and cathode sides. The creation of radicals is monitored by the EPR spin trapping technique. Read More

View Article and Full-Text PDF
September 2020

Higher intestinal and circulatory lactate associated NOX2 activation leads to an ectopic fibrotic pathology following microcystin co-exposure in murine fatty liver disease.

Comp Biochem Physiol C Toxicol Pharmacol 2020 Dec 8;238:108854. Epub 2020 Aug 8.

Environmental Health and Disease Laboratory, Department of Environmental Health Sciences, University of South Carolina, USA. Electronic address:

Clinical studies implicated an increased risk of intestinal fibrosis in patients with nonalcoholic fatty liver disease (NAFLD). Our previous studies have shown that microcystin-LR (MC-LR) exposure led to altered gut microbiome and increased abundance of lactate producing bacteria and intestinal inflammation in underlying NAFLD. This led us to further investigate the effects of the MC-LR, a PP2A inhibitor in activating the TGF-β fibrotic pathway in the intestines that might be mediated by increased lactate induced redox enzyme NOX2. Read More

View Article and Full-Text PDF
December 2020

Highly Efficient Photocatalytic Disinfection of by Rose Bengal-Functionalized Graphene Oxide Nanosheets.

J Nanosci Nanotechnol 2020 12;20(12):7558-7568

Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials, School of Chemistry & Chemical Engineering, Anhui University, Hefei 230601, China.

Rose Bengal (RB) was used as a functional pigment and poly dimethyl diallyl ammonium chloride was used as a coupling agent to modify Graphene Oxide (GO) in order to enhance the light absorption and ROS generation of GO. GO, RB and the obtained RB-PDDA-GO were characterized by scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectrometry, thermogravimetric analysis, Raman spectroscopy, UV-visible spectrophotometry, and X-ray photoelectron spectroscopy. The oxidation of hydroquinone to p-benzoquinone was used to evaluate the oxidation ability. Read More

View Article and Full-Text PDF
December 2020

Cannabis knowledge and implications for health: Considerations regarding the legalization of non-medical cannabis.

Med Sci Law 2020 Oct 29;60(4):309-314. Epub 2020 Jun 29.

Department of Psychology, University of Bath, United Kingdom.

Cannabis contains over a hundred of different cannabinoids, of which Δ-tetrahydrocannabinol (THC) and cannabidiol (CBD) are the most well studied. The use of high-potency cannabis, containing high concentrations of THC and low concentrations of CBD, has been linked to adverse health outcomes, particularly for adolescents and young adults. Recently, an increase in cannabis potency has been observed in jurisdictions that legalized the sale of cannabis for non-medical purposes. Read More

View Article and Full-Text PDF
October 2020

One-step preparation of sulfur-doped porous g-CN for enhanced visible light photocatalytic performance.

Dalton Trans 2020 Jun;49(24):8041-8050

School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.

Nonmetal doping is a convenient method to adjust the visible light photocatalytic activity of graphitic carbon nitride (g-C3N4). Herein, highly active sulfur-doped porous g-C3N4 (C3N4-S) was successfully prepared by one-step calcination using thiourea and melamine as the precursors. C3N4-S exhibited excellent photocatalytic performance for the degradation of Rhodamine B (RhB) under visible light irradiation. Read More

View Article and Full-Text PDF

The effect of DMPO on the formation of hydroxyl radicals on the rutile TiO(110) surface.

Phys Chem Chem Phys 2020 Jun 3;22(23):13129-13135. Epub 2020 Jun 3.

Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China.

Unraveling the formation mechanism of hydroxyl radicals (OH˙) is one of the outstanding issues in photocatalytic reactions, where 5,5-dimethyl-1-pyrroline N-oxide (DMPO) is widely utilized as a trapping agent to detect OH˙ radicals in experiments. In this study, we carry out density functional theory calculations to reveal the origin and formation process of OH˙ radicals by investigating the interaction of water with DMPO on a rutile TiO(110) surface. Our results clearly show that the OH˙ radicals trapped by DMPO stem from water upon illumination. Read More

View Article and Full-Text PDF