Day: January 5, 2023

Copper mobilisation from Cu sulphide minerals by methanobactin: Effect of pH , oxygen and natural organic matter was written by Rushworth, Danielle D.;Christl, Iso;Kumar, Naresh;Hoffmann, Kevin;Kretzschmar, Ruben;Lehmann, Moritz F.;Schenkeveld, Walter D. C.;Kraemer, Stephan M.. And the article was included in Geobiology in 2022.Electric Literature of CuH2O2 This article mentions the following:

Aerobic methane oxidation (MOx) depends critically on the availability of copper (Cu) as a crucial component of the metal center of particulate methane monooxygenase, one of the main enzymes involved in MOx. Some methanotrophs have developed Cu acquisition strategies, in which they exude Cu-binding ligands termed chalkophores under conditions of low Cu availability. A well-characterised chalkophore is methanobactin (mb), exuded by the microaerophilic methanotroph Methylosinus trichosporium OB3b. Aerobic methanotrophs generally reside close to environmental oxic-anoxic interfaces, where the formation of Cu sulfide phases can aggravate the limitation of bioavailable Cu due to their low solubility The reactivity of chalkophores towards such Cu sulfide mineral phases has not yet been investigated. In this study, a combination of dissolution experiments and equilibrium modeling was used to examine the dissolution and solubility of bulk and nanoparticulate Cu sulfide minerals in the presence of mb as influenced by pH, oxygen and natural organic matter. In general, we show that mb is effective at increasing the dissolved Cu concentrations in the presence of a variety of Cu sulfide phases that may potentially limit Cu bioavailability. More Cu was mobilised per mol of mb from Cu sulfide nanoparticles compared with well-crystalline bulk covellite (CuS). In general, the efficacy of mb at mobilising Cu from Cu sulfides is pH-dependent. At lower pH, e.g. pH 5, mb was ineffective at solubilizing Cu. The presence of mb increased dissolved Cu concentrations between pH 7 and 8.5, where the solubility of all Cu sulfides is generally low, both in the presence and absence of oxygen. These results suggest that chalkophore-promoted Cu mobilisation from sulfide phases is an effective extracellular mechanism for increasing dissolved Cu concentrations at oxic-anoxic interfaces, particularly in the neutral to slightly alk. pH range. This suggests that aerobic methanotrophs may be able to fulfil their Cu requirements via the exudation of mb in natural environments where the bioavailability of Cu is constrained by very stable Cu sulfide phases. In the experiment, the researchers used many compounds, for example, Cuprichydroxide (cas: 20427-59-2Electric Literature of CuH2O2).

Cuprichydroxide (cas: 20427-59-2) belongs to copper catalysts. The transition metal-catalyzed chemical transformation of organic electrophiles and organometallic reagents has turned up as an exceedingly robust synthetic tool. It is clear from the impact copper catalysis has had on organic synthesis that copper should be considered a first line catalyst for many organic reactions.Electric Literature of CuH2O2

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Removal of Heavy Metals from Industrial Wastewater by Chemical Precipitation: Mechanisms and Sludge Characterization was written by Benalia, Mohamed Charif;Youcef, Leila;Bouaziz, Mohamed Ghrissi;Achour, Samia;Menasra, Hayet. And the article was included in Arabian Journal for Science and Engineering in 2022.Related Products of 20427-59-2 This article mentions the following:

Chem. precipitation using lime (Ca(OH)₂), caustic soda (NaOH) and soda ash (Na₂CO₃) for the removal of simultaneous heavy metals (Cu(II) and Zn(II)) from industrial wastewater of the cable industry was carried out in laboratory by jar tests. For each reagent used, an improvement in copper and zinc removal efficiency was obtained by increasing the precipitating reagent dose (10-400 mg/L). Efficiencies of over 90% can be achieved. Chem. precipitation efficiency is related to the pH of the treatment. At a high final pH level (8 < pH < 10), the removal efficiency of copper for each precipitating agent is slightly higher than that of zinc and the residual metal contents were in conformity with industrial discharge standards In sludge product, zinc and copper were precipitated as amorphous hydroxides including Zn(OH)₂ and Cu(OH)₂. Based on XRD anal., the presence of an amount of other addnl. phases was noticed for copper. SEM images show that sludges produced are not large in size and are compact in structure. Corresponding EDX (energy-dispersive X-ray spectroscopy) shows that the amount of copper is higher than the amount of zinc in all recovered sludge. Wastewater treatment with soda ash resulted in a lower volume and a large product size of sludge. As a result, drying steps can be less expensive. This is a significant advantage comparably with the other precipitating agents. Soda ash may be considered as cost-effective precipitating agent for Cu(II) and Zn(II) in the industrial wastewater of the cable industry. In the experiment, the researchers used many compounds, for example, Cuprichydroxide (cas: 20427-59-2Related Products of 20427-59-2).

Cuprichydroxide (cas: 20427-59-2) belongs to copper catalysts. The applications of Copper-based nanoparticles have received great attention due to the earth-abundant, low toxicity and inexpensive. The copper-mediated C-C, C-O, C-N, and C-S bond formation is a part of one oldest reaction, emphasizing the Ullmann cross-coupling reaction.Related Products of 20427-59-2

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

XAFS and HAXPES analyses of the oxidation state of a copper surface buried under a phenolic resin nanofilm was written by Izumi, Atsushi;Shudo, Yasuyuki;Kakara, Takeshi. And the article was included in Applied Surface Science in 2022.Safety of Cuprichydroxide This article mentions the following:

The oxidation state of a buried copper surface under a phenolic resin insulating layer was investigated by nondestructive anal. methods using conversion electron yield X-ray absorption fine structure (CEY-XAFS) and hard XPS (HAXPES). The formation of Cu₂O and CuO during heat treatment at 180°C in air and the formation of Cu(OH)₂ and CuCO₃ during long-term storage under atm. conditions at room temperature proceeded on the buried copper surface to a depth of tens of nanometers. The phenolic resin nanofilm suppressed the thermal oxidation of the underlying Cu to Cu₂O and CuO by 20% but did not suppress the formation of native oxides Cu(OH)₂ and CuCO₃ under atm. conditions because of the high water absorption and high permeability of the phenolic resin nanofilm. This study demonstrated that CEY-XAFS and HAXPES technique are the powerful tools for investigation of oxidation states of the copper surface buried under the phenolic resin insulating layer. In the experiment, the researchers used many compounds, for example, Cuprichydroxide (cas: 20427-59-2Safety of Cuprichydroxide).

Cuprichydroxide (cas: 20427-59-2) belongs to copper catalysts. The applications of Copper-based nanoparticles have received great attention due to low toxicity and inexpensive, earth-abundant. It is clear from the impact copper catalysis has had on organic synthesis that copper should be considered a first line catalyst for many organic reactions.Safety of Cuprichydroxide

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Oxygen vacancies in Cu/TiO₂ boost strong metal-support interaction and CO₂ hydrogenation to methanol was written by Zhang, Chenchen;Wang, Letian;Etim, Ubong Jerome;Song, Yibing;Gazit, Oz M.;Zhong, Ziyi. And the article was included in Journal of Catalysis in 2022.Safety of Cuprichydroxide This article mentions the following:

How to efficiently activate and convert CO2 through hydrogenation to value-added chems. is a major challenge. This work investigates the role of oxygen vacancy (Ov) in the Cu/TiO₂ catalysts, which are promising for this reaction. The TiO_2-x support was pre-reduced in high-pressure H₂ gas at different temperatures to generate Ov with different concentrations Cu/TiO_2-x-500 with TiO₂ pre-reduced at 500 °C showed much higher CO₂ conversion and CH₃OH selectivity than the other Cu/TiO₂ catalysts. The Ov in the reduced TiO₂ induced a strong metal-support interaction (SMSI) between Cu and TiO₂ at relatively low temperatures Although the SMSI caused partial covering of the Cu nanoparticles by TiO_2-x, the Ov in the newly formed interface could facilitate the activation of the CO₂ mols. and promote the formation of the proper reaction intermediates for methanol formation. Various characterizations, including DFT calculations, revealed the detailed structural evolution of CO₂ to methanol on the Cu/TiO₂ catalyst, and it follows the Formate pathway. In the experiment, the researchers used many compounds, for example, Cuprichydroxide (cas: 20427-59-2Safety of Cuprichydroxide).

Cuprichydroxide (cas: 20427-59-2) belongs to copper catalysts. The evolution of transition metal catalysts has attained a stage of civilization that authorizes for an extensive scope of chemical bonds formation partners to be combined efficiently. The copper-mediated C-C, C-O, C-N, and C-S bond formation is a part of one oldest reaction, emphasizing the Ullmann cross-coupling reaction.Safety of Cuprichydroxide

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Rh single atoms/clusters confined in metal sulfide/oxide nanotubes as advanced multifunctional catalysts for green and energy-saving hydrogen productions was written by Nguyen, Dinh Chuong;Doan, Thi Luu Luyen;Prabhakaran, Sampath;Kim, Do Hwan;Kim, Nam Hoon;Lee, Joong Hee. And the article was included in Applied Catalysis, B: Environmental in 2022.Reference of 20427-59-2 This article mentions the following:

In this work, smart strategies are conducted to design advanced multifunctional electrocatalysts: Co₃S₄/CoO_x heterostructured nanosheets-assembled nanotube arrays on 3D framework integrated with single Rh atoms and subnanometer clusters. The catalyst can reach c.d. of 10 mA cm^-2 at low overpotentials of 248.2, and 56.1 mV for oxygen evolution reaction, and hydrogen evolution reaction, resp. The catalyst also shows very low potential of 1.32 V for urea oxidation reaction at 10 mA cm^-2. A water electrolyzer that achieves c.d. of 10 mA cm^-2 at small cell voltage of 1.45 V is prepared under action of the developed catalyst. We also conduct urea electrolysis assembled with the catalyst and find that the device requires a cell voltage of only 1.35 V to drive a c.d. of 10 mA cm^-2, proving the great potential of our catalyst for simultaneous energy-saving H₂ production and the treatment of urea-rich wastewater. In the experiment, the researchers used many compounds, for example, Cuprichydroxide (cas: 20427-59-2Reference of 20427-59-2).

Cuprichydroxide (cas: 20427-59-2) belongs to copper catalysts. Transition metal-catalyzed chemical transformation of organic electrophiles and organometallic reagents belong to the most important cross-coupling reaction in organic synthesis. Due to these characteristics, copper nanoparticles have generated a great deal of interest especially in the field of catalysis. Reference of 20427-59-2

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

On the Auger parameter of Cu(II) compounds was written by Moretti, Giuliano;Beck, Horst P.. And the article was included in Surface and Interface Analysis in 2022.Application of 20427-59-2 This article mentions the following:

The Auger parameter (AP) of Cu(I) halides follow the trend: α’_Cu(s) > α’CuI > α’CuBr > α’CuCl > > α’_Cu(g), in agreement with the electronic polarizabilities of the nearest-neighbor ligands of the core-ionized Cu(I) ion. On the contrary, the AP of Cu(II) halides and other Cu(II) compounds are close to that of copper metal. We extend our simple AP semiempirical model, published in this journal in 2019, to try to understand the unusual results reported for the Cu(II) compounds In the experiment, the researchers used many compounds, for example, Cuprichydroxide (cas: 20427-59-2Application of 20427-59-2).

Cuprichydroxide (cas: 20427-59-2) belongs to copper catalysts. Copper has continued to be one of the most utilized and important transition metal catalysts in synthetic organic chemistry. Copper nanoparticles can catalyze the Ullmann coupling reaction in a wide range of applications.Application of 20427-59-2

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Wetting and corrosion properties of Cu_xO_y films deposited by magnetron sputtering for maritime applications was written by Castro, Jose D.;Lima, M. J.;Carvalho, S.. And the article was included in Applied Surface Science in 2022.Name: Cuprichydroxide This article mentions the following:

Copper-based materials can be safe and economic alternatives for producing anti-biofouling coatings for large-scale applications. Although their antibiofouling properties have been previously described, the wetting and corrosion properties in specific environments such as the maritime industry has been far less explored. In this study, copper oxide (Cu_xO_y) films were deposited by a DC reactive magnetron sputtering technique on stainless steel substrates. The oxygen amount during deposition was varied to obtain different structures. The films were characterised by SEM, EDS, XRD, AFM, and contact angle measurements. Oxygen incorporation into copper films promoted a significant change in the growth profile of the film, from dense and undefined grains to columnar grains with well-defined boundaries. Wettability results demonstrate that Cu_xO_y films are high dispersive surfaces with poor affinity with seawater. Corrosion tests were performed in an NaCl (3.5% weight) solution during 24 h through EIS and potentiodynamic polarization. The films were chem. characterized before and after corrosion tests by XPS as well as their ionic releasing process by ICP-OES spectroscopy. Cu_xO_y coatings exhibited a poor corrosion resistance against artificial seawater and high ionic (Cu²⁺) release, which suggests a diffusion process. The results give insights into the chem. resistance of Cu_xO_y films for application to avoid biofouling under seawater exposure. In the experiment, the researchers used many compounds, for example, Cuprichydroxide (cas: 20427-59-2Name: Cuprichydroxide).

Cuprichydroxide (cas: 20427-59-2) belongs to copper catalysts. The applications of Copper-based nanoparticles have received great attention due to the earth-abundant, low toxicity and inexpensive. Copper nanoparticles can also catalyze the coupling reaction of phenols, thiols, xanthogenates, nitrogen-containing nucleophiles, selenium ruthenium nucleophiles and the like.Name: Cuprichydroxide

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

In Situ Spectroscopic Characterization and Theoretical Calculations Identify Partially Reduced ZnO_1-x/Cu Interfaces for Methanol Synthesis from CO₂ was written by Liu, Xinyu;Luo, Jie;Wang, Hengwei;Huang, Li;Wang, Shasha;Li, Shang;Sun, Zhihu;Sun, Fanfei;Jiang, Zheng;Wei, Shiqiang;Li, Wei-Xue;Lu, Junling. And the article was included in Angewandte Chemie, International Edition in 2022.Category: copper-catalyst This article mentions the following:

The active site of the industrial Cu/ZnO/Al₂O₃ catalyst used in CO₂ hydrogenation to methanol has been debated for decades. Grand challenges remain in the characterization of structure, composition, and chem. state, both microscopically and spectroscopically, and complete theor. calculations are limited when it comes to describing the intrinsic activity of the catalyst over the diverse range of structures that emerge under realistic conditions. Here a series of inverse model catalysts of ZnO on copper hydroxide were prepared where the size of ZnO was precisely tuned from atomically dispersed species to nanoparticles using at. layer deposition. ZnO decoration boosted methanol formation to a rate of 877 gMeOH kgcat^-1 h^-1 with ≈80% selectivity at 493 K. High pressure in situ X-ray absorption spectroscopy demonstrated that the atomically dispersed ZnO species are prone to aggregate at oxygen-deficient ZnO ensembles instead of forming CuZn metal alloys. By modeling various potential active structures, d. functional theory calculations and microkinetic simulations revealed that ZnO/Cu interfaces with oxygen vacancies, rather than stoichiometric interfaces, Cu and CuZn alloys were essential to catalytic activation. In the experiment, the researchers used many compounds, for example, Cuprichydroxide (cas: 20427-59-2Category: copper-catalyst).

Cuprichydroxide (cas: 20427-59-2) belongs to copper catalysts. Copper has continued to be one of the most utilized and important transition metal catalysts in synthetic organic chemistry. Copper nanoparticles can also catalyze the coupling reaction of phenols, thiols, xanthogenates, nitrogen-containing nucleophiles, selenium ruthenium nucleophiles and the like.Category: copper-catalyst

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Preparation of Cu₂O crystals by glucose liquid phase reduction: Morphology evolution and size control was written by Huang, Wei;Wang, Xuan;Wang, Yuansheng;Li, Yongqing;Wang, Bo;Wang, Yujiang;Wei, Shicheng. And the article was included in Solid State Sciences in 2022.Formula: CuH2O2 This article mentions the following:

Cu₂O crystals with different sizes from cube to octahedron have been successfully synthesized by a facile synthetic method without addnl. capping agents. The residual OH- shows directional adsorption on the {111} facet, modifying the growth rate along the <100> and <111> directions and froming different Cu₂O shapes. The morphol. and size of Cu₂O crystal are affected by exptl. parameters including the concentration of CuSO₄·5H₂O, NaOH, glucose, the pre-reaction time and the initial temperature In the experiment, the researchers used many compounds, for example, Cuprichydroxide (cas: 20427-59-2Formula: CuH2O2).

Cuprichydroxide (cas: 20427-59-2) belongs to copper catalysts. Copper catalyst has received great attention owing to the low toxicity and low cost. These ligands enable the reaction promoted in mild condition. The reaction scope has also been greatly expanded, rendering this copper-based cross-coupling attractive for both academia and industry. Formula: CuH2O2

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”

Surface chemical and geometrical properties of pure copper powder intended for binder jetting and sintering was written by Nyborg, Lars;Cao, Yu. And the article was included in Surface and Interface Analysis in 2022.Synthetic Route of CuH2O2 This article mentions the following:

One novel important application of sinter-based additive manufacturing involving binder jetting is copper-based products. Three different variants of nominally pure copper powder having particle size distributions with D90 < 16, 22, or 31μm were investigated in this study. The packing behavior and the flow properties using dynamic test and shear cell, as well as sp. surface area were evaluated. The analyses employed illustrate the multidimensional complexity. Because different measurements capture different aspect of the powder, it is imperative to apply a characterization approach involving different methods. Surface chem. anal. by means of XPS showed that all powder variants were covered by Cu₂O, CuO, and Cu (OH)₂, with Cu₂O being dominant in all cases. The finest powder with D90 < 16μm tended to have higher relative amount of copper in divalent state. The average apparent oxide thickness estimated by XPS depth profiling showed that the two coarser variants had similar overall average oxide thickness, whereas the finest one possessed smaller oxide thickness. The surface chem. of the powder grades is found to be related to their rheol. behavior in dynamic condition. Considering the sp. surface areas in combination with the average oxide thicknesses, the amount of surface bound oxygen was estimated to be about~220 ppm for all three variants. Specific concerns need to be taken during the sintering of powder to keep oxygen level below that of electrolytic pitch copper (400 ppm). In the experiment, the researchers used many compounds, for example, Cuprichydroxide (cas: 20427-59-2Synthetic Route of CuH2O2).

Cuprichydroxide (cas: 20427-59-2) belongs to copper catalysts. The evolution of transition metal catalysts has attained a stage of civilization that authorizes for an extensive scope of chemical bonds formation partners to be combined efficiently. The copper-mediated C-C, C-O, C-N, and C-S bond formation is a part of one oldest reaction, emphasizing the Ullmann cross-coupling reaction.Synthetic Route of CuH2O2

Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”