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Showing papers on "Hydrogen peroxide published in 2019"


Journal ArticleDOI
TL;DR: An iron single atom catalyst is reported that can convert oxygen into hydrogen peroxide with a selectivity of above 95% in both alkaline and neutral pH and demonstrated an effective water disinfection as a representative application.
Abstract: Shifting electrochemical oxygen reduction towards 2e- pathway to hydrogen peroxide (H2O2), instead of the traditional 4e- to water, becomes increasingly important as a green method for H2O2 generation. Here, through a flexible control of oxygen reduction pathways on different transition metal single atom coordination in carbon nanotube, we discovered Fe-C-O as an efficient H2O2 catalyst, with an unprecedented onset of 0.822 V versus reversible hydrogen electrode in 0.1 M KOH to deliver 0.1 mA cm-2 H2O2 current, and a high H2O2 selectivity of above 95% in both alkaline and neutral pH. A wide range tuning of 2e-/4e- ORR pathways was achieved via different metal centers or neighboring metalloid coordination. Density functional theory calculations indicate that the Fe-C-O motifs, in a sharp contrast to the well-known Fe-C-N for 4e-, are responsible for the H2O2 pathway. This iron single atom catalyst demonstrated an effective water disinfection as a representative application.

423 citations


Journal ArticleDOI
TL;DR: In this article, a simple one-pot synthetic approach for the Mn-doped graphite phase carbon nitride (g-C3N4) materials and make it as a catalyst to activate peroxymonosulfate (PMS) degradation was presented.

281 citations


Journal ArticleDOI
TL;DR: It is shown that pure water microdroplets directly generate H2O2 without help from O2 either in air surrounding the droplet or dissolved in water, and suggests that hydroxyl radical (OH) recombination is the most likely source.
Abstract: We show H2O2 is spontaneously produced from pure water by atomizing bulk water into microdroplets (1 μm to 20 µm in diameter). Production of H2O2, as assayed by H2O2-sensitve fluorescence dye peroxyfluor-1, increased with decreasing microdroplet size. Cleavage of 4-carboxyphenylboronic acid and conversion of phenylboronic acid to phenols in microdroplets further confirmed the generation of H2O2. The generated H2O2 concentration was ∼30 µM (∼1 part per million) as determined by titration with potassium titanium oxalate. Changing the spray gas to O2 or bubbling O2 decreased the yield of H2O2 in microdroplets, indicating that pure water microdroplets directly generate H2O2 without help from O2 either in air surrounding the droplet or dissolved in water. We consider various possible mechanisms for H2O2 formation and report a number of different experiments exploring this issue. We suggest that hydroxyl radical (OH) recombination is the most likely source, in which OH is generated by loss of an electron from OH− at or near the surface of the water microdroplet. This catalyst-free and voltage-free H2O2 production method provides innovative opportunities for green production of hydrogen peroxide.

210 citations


Journal ArticleDOI
TL;DR: Fe-N-C single-atom nanozymes with intrinsic peroxidase-like activity was successfully prepared via high-temperature calcination using FeCl2, glucose, and dicyandiamide as precursors and colorimetric biosensing of H2O2 in vitro was performed, demonstrating the satisfactory specificity and sensitivity.
Abstract: Recently, in situ detection of hydrogen peroxide (H2O2) generated from live cells have caused tremendous attention, because it is of great significance in the control of multiple biological processes. Herein, Fe-N-C single-atom nanozymes (Fe-N-C SAzymes) with intrinsic peroxidase-like activity were successfully prepared via high-temperature calcination using FeCl2, glucose, and dicyandiamide as precursors. The Fe-N-C SAzymes with FeNx as active sites were similar to natural metalloproteases, which can specifically enhance the peroxidase-like activity rather than oxidase-like activity. Accordingly, owing to the excellent catalytic efficiency of the Fe-N-C SAzymes, colorimetric biosensing of H2O2 in vitro was performed via a typical 3,3',5,5'-tetramethylbenzidine induced an allochroic reaction, demonstrating the satisfactory specificity and sensitivity. With regard to the practical application, in situ detection of H2O2 generated from the Hela cells by the Fe-N-C SAzymes was also performed, which can expand the applications of the newborn SAzymes.

203 citations


Journal ArticleDOI
TL;DR: Carbon-based materials are considered to be active for electrochemical oxygen reduction reaction (ORR) to hydrogen peroxide (H2O2) production as discussed by the authors, however, less attention is paid to the investigat...
Abstract: Carbon-based materials are considered to be active for electrochemical oxygen reduction reaction (ORR) to hydrogen peroxide (H2O2) production. Nevertheless, less attention is paid to the investigat...

188 citations


Journal ArticleDOI
TL;DR: The emergence of metal-free carbon catalysts for the selective synthesis of H2 O2 is expected to revolutionize ORR research, beckoning at the development of new industrial schemes.
Abstract: One of the recent trends in electrocatalytic reactions involves the oxygen reduction reaction (ORR), where a new paradigm has been shaped to exploit this reaction for the synthesis of hydrogen peroxide (H2 O2 ). H2 O2 is a very versatile chemical of high commercial value, prepared currently through poorly sustainable processes. The emergence of metal-free carbon catalysts for the selective synthesis of H2 O2 is expected to revolutionize ORR research, beckoning at the development of new industrial schemes. The complexities of the mechanism and the factors dominating the selectivity of the process have been unveiled through a combination of theoretical and experimental studies.

179 citations


Journal ArticleDOI
TL;DR: D density functional theory calculation was in good agreement with the experimental results, which proved that the Fe2+/OA/CaO2 could improve the circulation between Fe2- and Fe3+, promoting the oxygen reactive species generation and pollutant removal.

164 citations


Journal ArticleDOI
01 Jan 2019-Carbon
TL;DR: In this paper, the effect of hydrogen peroxide on the final properties of graphene oxide (GO) has been investigated, and it has been shown that the quantity of HPO added in the final stage strongly affects the final GO properties.

152 citations


Journal ArticleDOI
TL;DR: In this paper, a two-electron water oxidation reaction (2e-WOR) is used for delocalized production of hydrogen peroxide for water cleaning and other applications.
Abstract: Electrochemical synthesis of hydrogen peroxide (H2O2) via two-electron water oxidation reaction (2e-WOR) is an ideal process for delocalized production for water cleaning and other applications. Pr...

149 citations


Journal ArticleDOI
TL;DR: A digestion protocol based on H2O2 + Fe or KOH at 50 °C for 1 h may be used on microplastic samples and it is revealed that H2 O2‹+‹Fe is more appropriate for plant material and KOH for animal tissue.

146 citations


Journal ArticleDOI
TL;DR: In this paper, the authors proposed a decentralized on-site production of hydrogen peroxide (H2O2) relies on efficient, robust, and inexpensive electrocatalysts for the selective two-electron (2e-) oxygen reduction reaction (ORR).
Abstract: Decentralized on-site production of hydrogen peroxide (H2O2) relies on efficient, robust, and inexpensive electrocatalysts for the selective two-electron (2e–) oxygen reduction reaction (ORR). Here...

Journal ArticleDOI
TL;DR: Overall, UV/PS process was the most effective for TSL degradation and mineralization in the presence or absence of common water constituents and showed the highest TOC removal of ∼35%.

Journal ArticleDOI
TL;DR: In this article, the photoelectrochemical (PEC) water splitting system has been tuned to produce a high value-added product and be a competitive strategy for photovoltaic cell and electrolysis research.
Abstract: Propelled by photovoltaic cell and electrolysis research, the photoelectrochemical (PEC) water splitting system has been tuned to produce a high-value-added product and be a competitive strategy fo...

Journal ArticleDOI
TL;DR: This work demonstrates a novel pH-sensitive system containing hemoglobin and GOx for effective and selective cancer treatment using both radical generation and nutrient starvation.
Abstract: Separately, Fenton and starvation cancer therapies have been recently reported as impressive methods for tumor destruction. Here, we introduce natural hemoglobin and glucose oxidase (GOx) for efficient cancer treatment following combined Fenton and starvation therapies. GOx and hemoglobin were encapsulated in zeolitic imidazolate frameworks 8 (ZIF-8) to fabricate a pH-sensitive MOF activated by tumor acidity. In the slightly acidic environment of cancer cells, GOx is released and it consumes d-glucose and molecular oxygen, nutrients essential for the survival of cancer cells, and produces gluconic acid and hydrogen peroxide, respectively. The produced gluconic acid increases the acidity of the tumor microenvironment leading to complete MOF destruction and enhances hemoglobin and GOx release. The Fe ions from the heme groups of hemoglobin also release in the presence of both endogenous and produced H2O2 and generate hydroxyl radicals. The produced OH˙ radical can rapidly oxidize the surrounding biomacromolecules in the biological system and treat the cancer cells. In vitro experiments demonstrate that this novel nanoparticle is cytotoxic to cancer cells HeLa and MCF-7, at very low concentrations (<2 μg mL-1). In addition, the selectivity index values are 5.52 and 11.04 for HeLa and MCF-7 cells, respectively, which are much higher than those of commercial drugs and those of similar studies reported by other research groups. This work thus demonstrates a novel pH-sensitive system containing hemoglobin and GOx for effective and selective cancer treatment using both radical generation and nutrient starvation.

Journal ArticleDOI
TL;DR: The experiments indicated that the moderate SPC dosages in the DBD presented an obvious synergistic effect, improving the TC decomposition efficiency and kinetics, and the collaborative method could increase the generation of reactive species and the produced hydroxyl and superoxide radicals both played the significant roles for the TC elimination.

Journal ArticleDOI
TL;DR: A simple route for synthesizing silver nanoparticles (AgNPs) in the presence of a nanostructured polysaccharide (cellulose nanowhiskers) to produce a hybrid material, which was employed as a colorimetric probe for H2O2 detection and proved to be suitable for real samples analysis even in the absence of other interfering substances.

Journal ArticleDOI
TL;DR: In this paper, a facile fuel photocatalytic oxidative desulfurization and extraction system was established on the basis of Ch3-HPW, air, and acetonitrile (MeCN), to better understand the 3O2 activation in specific applications.
Abstract: Many studies have been conducted regarding the separation behavior of carriers (electrons and holes) because of involving the generation of superoxide radicals (O2− ), hydroxyl radicals (HO ), and hydrogen peroxide (H2O2) in the photocatalytic process of heteropolyacids. Instead, relatively little attention has been focused on the potential Coulomb interactions between photogenerated electrons (e−) and holes (h+). Herein, choline-phosphotungstic acid (Ch3-HPW) was synthesized via one-step acid-base neutralization reaction method, and characterized. The electronic excited state analysis of Ch3-HPW showed that the formation of singlet oxygen (1O2) was related to the electron-hole interactions in the photocatalytic process of ground state molecular oxygen (3O2) activation. Subsequently, a facile fuel photocatalytic oxidative desulfurization and extraction system was established on the basis of Ch3-HPW, air, and acetonitrile (MeCN), to better understand the 3O2 activation in specific applications. The main photocatalytic reaction conditions affecting the desulfurization process, including the amount of Ch3-HPW, the volume ratio of MeCN to model oil, the initial S-concentration, air/N2 bubbling, sulfur compounds, and fuel composition, were systematically investigated under UV radiation. The sulfur removal for model oil and straight-run gasoline in the system were 99.6% and 89.9%, respectively. The results of radical scavenger experiments, electron spin-resonance (ESR) spectroscopy, and density functional theory (DFT) calculations further demonstrated that 1O2, H2O2, and h+ played important roles in the oxidation of sulfur-containing compounds. A new method was developed for the desulfurization of liquid fuels using green and inexpensive O2 in this work to promote the development of photocatalytic process of exciton-involved HPA-based photocatalysts.

Journal ArticleDOI
TL;DR: Overall, H2O2 treatment improved growth, photosynthesis, metabolic state of the plants which provided tolerance and helped the plants to cope well under Cu stress.

Journal ArticleDOI
TL;DR: In this paper, a green strategy of coupling bicarbonate-activated hydrogen peroxide (BHP) oxidation and alkaline precipitation was proposed for simultaneous decomplexation of Cu-ethylenediaminetetraacetic acid (Cu-EDTA) and Cu precipitation.

Journal ArticleDOI
TL;DR: Chelator decreased PMSO2 production while promoting PMSO loss at near-neutral pH, suggesting that Fe(II)-chelator complexes also tended to catalyze H2O2 to generate •OH rather than Fe(IV), and chelator altered reactive intermediate nature fromFe(IV) to SO4•- and Fe( IV) yield was not sensitive to pH.

Journal ArticleDOI
TL;DR: This study is the first one to describe the method of determination of hydrogen peroxide in milk using high performance liquid chromatography and it has been shown that interaction of triphenylphosphine and hydrogenperoxide required about 40 min.

Journal ArticleDOI
TL;DR: In this article, the authors studied the mechanisms for optimization of the photocatalytic hydrogen peroxide production over TiO2 (Aeroxide P25) and obtained an apparent quantum yield of up to 19.8% and a production rate up to 83 μM min-1.
Abstract: This study focuses on understanding the mechanisms for optimization of the photocatalytic hydrogen peroxide production over TiO2 (Aeroxide P25). Via precise control of the reaction parameters (pH, temperature, catalyst amount, oxygen content, sacrificial electron donor, and light intensity), it is possible to tune either the apparent quantum yield or the production rate. As a result of the optimization, apparent quantum yields of up to 19.8% and production rates of up to 83 μM min–1 were obtained. We also observed a light-dependent change of the reaction order and an interdependency of the light intensity and catalyst amount, and we developed a well-fitting kinetic model for it, which might also be applied to other reactions. Furthermore, a previously unreported inactivation of the photocatalyst in the case of water oxidation is described.

Journal ArticleDOI
TL;DR: This study identified and compared transformation products of propranolol produced by hydroxyl radical (•OH) and sulfate radical (SO4•-) and compared them with the acute toxicity assay of Vibrio fischeri.

Journal ArticleDOI
TL;DR: Rotating ring disk electrode (RRDE) results demonstrated that less PTFE content in CLs would result in less electrons transferred and better selectivity towards 2-electron ORR, which proved that H2O2 decomposition reaction was the major side reaction.
Abstract: Electrochemical catalysis of carbon-based material via two-electron pathway oxygen reduction reaction (ORR) offers great potential for in situ hydrogen peroxide (H2O2) production. In this work, we ...

Journal ArticleDOI
TL;DR: Good recovery and accuracy of UA measurement indicated that this established colorimetric sensing system is appropriate for UA revealing in actual experimental samples, and Th-MOF catalyst has outstanding stability.

Journal ArticleDOI
Zile Zhou1, Yaqian Li1, Wei Su1, Biao Gu1, Hai Xu1, Cuiyan Wu1, Peng Yin1, Haitao Li1, Youyu Zhang1 
TL;DR: In this paper, a novel near-infrared probe (DCM-B) containing dicyanomethylene-4H-pyran as fluorophore and boronate ester group as the recognition unit was developed for the detection of H2O2.
Abstract: As a classic kind of reactive oxygen species (ROS), hydrogen peroxide (H2O2) plays a critical role in physiological and pathological processes. It is of significant importance to detect H2O2 with sufficient sensitivity, selectivity and universality in biological field. Herein a novel near-infrared probe (DCM-B) containing dicyanomethylene-4H-pyran as fluorophore and boronate ester group as the recognition unit was developed for the detection of H2O2. Experiments showed that the remarkable fluorescence enhancement and noticeable color change from yellow to purple were observed while H2O2 was added to DCM-B solution. It is proved that the boronate ester group of DCM-B cleavage and fluorescence off-on response based on intramolecular charge transfer (ICT) mechanism were obtained when the probe reacted with H2O2, and DCM-B showed excellent sensitivity, high selectivity to H2O2 detection in the presence of many competing analytes. Encouraged by the optical properties of near-infrared emission, it was successfully applied to the imaging of exogenous and endogenous hydrogen peroxide in living cells. More importantly, considering that the final metabolite of choline and glucose is H2O2 in living cells and organism, we expanded DCM-B to the indirect detection of choline and glucose with satisfactory performance.

Journal ArticleDOI
TL;DR: In this article, an innovative approach to increase the electron density of metallic Pd nanoparticles loaded on TiO2 photocatalysts by coordinating Pd with surface-anchored organic ligands was presented.
Abstract: We here present an innovative approach to increase the electron density of metallic Pd nanoparticles loaded on TiO2 photocatalysts by coordinating Pd with surface-anchored organic ligands. X-ray ph...

Journal ArticleDOI
TL;DR: In this paper, the leaching conditions of the concentration of citric acid, H2O2 dosage, reaction temperature, reaction time and solid-to-liquid ratio on leaching efficiency have been discussed.


Journal ArticleDOI
TL;DR: In this article, different redox organic compounds employed as modifiers of carbon black Printex L6 (CP) with the aim of increasing H2O2 production using carbon-based electrodes were investigated.
Abstract: Although the electrosynthesis of hydrogen peroxide (H2O2) using gas diffusion electrodes (GDE) is a viable option for the production of this oxidizing agent in advanced oxidation processes (AOP) for wastewater treatment, the quest for more efficient electrodes is still regarded a matter of great importance in this area. The present study sought to investigate different redox organic compounds employed as modifiers of carbon black Printex L6 (CP) with the aim of increasing H2O2 production using carbon-based electrodes. Varying amounts of the modifiers, including Sudan Red 7B (SR7B), methyl-p-benzoquinone (MPB), anthraflavic acid (AA) and anthraquinone-2-carboxylic acid (A2CA), were added to carbon black, where the electrochemical activity was studied by applying a microporous catalyst layer on a rotating ring-disk electrode (RRDE). The materials containing 0.5% of SR7B and 5.0% of MPB increased the current efficiency for the electrogeneration of hydrogen peroxide to 86.2% and 85.5%, respectively, compared to 82.8% obtained for unmodified carbon. Carbon Printex L6 gas diffusion electrodes modified with 0.5% of SR7B were studied and the following results were obtained: the application of current density of 75 mA cm−2 led to the production of 1020.1 mg L-1 of H2O2, with an energy consumption of 118.0 kW h kg-1, apparent kinetic constant of 37.34 mg L-1 min-1 and current efficiency of 17.87%. Conversely, the use of GDE with unmodified carbon resulted in the production of relatively less quantity of H2O2 which amounted to 717.3 mg L-1, with more energy consumption of 168.5 kW h kg-1, lower apparent kinetic constant of 21.41 mg L-1 min-1 and lower current efficiency of 12.57%. Based on these results, carbon Printex L6 GDE modified with 0.5% of Sudan Red 7B is seen as a suitable alternative for the production of high amounts of H2O2 which can be applied in advanced oxidation processes in acidic medium.