Extracting Copper by Lactic Acid from Copper Oxide Ore …

2015-7-20 · The empirical equation for the dissolution process was established to be 1/3ln (1−x)+ [ (1−x)−1/3−1]= [1.94C1.927P1.322 exp (−3507.34/T)]t. …

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Effects of pH variation in aqueous solutions on dissolution …

2010-3-28 · The dissolution characteristics of the aqueous solutions were measured in terms of the solubility of copper oxides and metallic copper. The citric acid solution had a good solvent property for copper oxides in the range of acidic conditions, whereas the MEA solution showed the same property in the basic region.

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Aggregation, Sedimentation, and Dissolution of Copper …

Copper oxide nanoparticles (CuO NPs) are typical MNPs released into the environment and may pose potential risks to the quantity and quality of agricultural products . In this study, the rice plant was used as a model plant since it is the most consumed staple food in the world.

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Impact of copper oxide particle dissolution on lung …

The in vitro and in vivo toxicity of copper oxide nanoparticles (CuO NPs) is attributed to both particle and dissolved copper ion species. However, a clear understanding of (1) the specific cellular responses that are modulated by the two species and (2) the temporal dynamics in toxicity, as the proportional amount of particulate and ionic forms change over time, is lacking.

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Acid dissolution of copper oxides as a method for the …

2011-7-18 · Here we reported the acid dissolution of copper oxides as a methodology for the activation of Cu(0) wire used as catalyst in single‐electron transfer living radical polymerization (SET‐LRP). In this method, the oxide layer on the surface of commercial Cu(0) wire was removed by dissolution in a concentrated acid such as nitric acid, glacial ...

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A comprehensive study of the leaching behavior and …

2022-7-20 · dissolution of copper oxide ore. ratio of 10 mL/g is found to be optimal for leaching of copper using H2SO4. This can be explained in a way that the leaching agent is in excess of the calculated amount for the extraction of copper. After 75 min of dissolution, the amounts of copper extracted from the oxide ore were 57.37, 74.73, and 66.71% at L ...

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Effects of pH variation in aqueous solutions on dissolution …

Dissolution characteristics, such as the solubility of copper oxides and the complexation stability between copper ions and aqueous solutions, were analyzed under …

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Aggregation and dissolution of aluminium oxide and …

2020-6-4 · Aggregation and dissolution kinetics of aluminium oxide nanoparticles (nAl 2 O 3) and copper oxide nanoparticles (nCuO) in deionised water (DIW) and freshwater sourced from two river systems were studied with the objective to understand the influencing factors.Dynamic light scattering and inductively coupled plasma mass spectrometer were used to study aggregation …

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The promoted dissolution of copper oxide ...

2019-12-16 · @article{Liu2019ThePD, title={The promoted dissolution of copper oxide nanoparticles by dissolved humic acid: Copper complexation over particle dispersion.}, author={Siqian Liu and Yang Liu and Bo Pan and Ying He and Bowen Li and Dandan Zhou and Yin-long Xiao and Hao Qiu and Martina G. Vijver and Willie J.G.M. Peijnenburg}, …

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Dissolution kinetics and solubility of copper oxide …

2022-1-27 · Nano copper oxide (CuO NP) was added to eight soils to study the effect of aging time of copper on the concentration of diethylenetriaminepentaacetic acid (DTPA)-extracted copper (DTPA-Cu), with bulk copper oxide (CuO BP) and copper nitrate [Cu(NO3)2] used for comparison. Moreover, the effect of soil properties on the dissolution of CuO NP was studied. …

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Transpassive Dissolution of Copper and Rapid Formation …

2011-2-28 · Reproducible copper oxide films were obtained by controlling the electrolyte composition (19 M NaOH), the electrolyte temperature (T), the applied potential (E), the dissolution time during the applied anodic potential (t 1), and the time for growth of the oxide after the anodic potential was terminated (t 2). The possible combinations of these ...

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Aggregation, Sedimentation, and Dissolution of Copper …

2019-6-1 · Aggregation, Sedimentation, and Dissolution of Copper Oxide Nanoparticles: Influence of Low-Molecular-Weight Organic Acids from Root Exudates Nanomaterials (Basel) . 2019 Jun 1;9(6):841. doi: 10.3390/nano9060841.

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Dissolution of copper oxide nanoparticles is controlled by soi…

A kinetic model of the dissolution of copper(II) oxide in

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Dissolution of copper oxide by the ethanolamine and …

The dissolution rate was strongly aff... Skip to Article Content; Skip to Article Information; Search within. Search term. Advanced Search Citation ... Dissolution of copper oxide by the ethanolamine and ammonium fluoride in aqueous solution. Cheon Kwang Ko. Department of Chemical Engineering, Kangwon National University, Chuncheon‐si ...

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Dissolution of copper oxide nanoparticles is controlled by …

Dissolution of copper oxide nanoparticles is controlled by soil solution pH, dissolved organic matter, and particle specific surface area Author: Meilan Xu, Yansu Wang, Zuting Mu, Shiwei Li, Helian Li Source: Science of the total environment 2021 v.772 pp. 145477 ISSN: 0048-9697

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Copper oxide nanoparticle dissolution at alkaline pH is …

COPPER OXIDE NANOPARTICLE DISSOLUTION AT ALKALINE pH IS CONTROLLED BY DISSOLVED ORGANIC MATTER: INFLUENCE OF SOIL-DERIVED ORGANIC MATTER, WHEAT, BACTERIA, AND NANOPARTICLE COATING J. M. Hortin,a A. J. Anderson,b D. W. Britt,b A. R. Jacobson,c and J. E. McLeana a Utah Water Research Laboratory, Department of …

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Dissolution of copper and copper oxide in aqueous …

2022-7-22 · Using a component having an amine group (−NH 2) or a carboxyl group (−COOH) for a cleaning solution, the etching rates of copper oxide and copper were analyzed by measuring the solubility of copper to evaluate the etch residue removal properties.Based on this, it was attempted to establish the basis of a cleaning process for removing etch residues in the …

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Dissolution of copper oxide by the ethanolamine and …

2011-4-28 · The dissolution rate was strongly affected by the pH of the solution. The solution of ammonium fluoride showed good properties for the dissolution of copper oxide in the range of acidic conditions, whereas the solution containing ethanolamine showed a dissolution property within the basic condition.

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Investigating the Role of Copper Oxide in Electrochemical …

2018-2-13 · Copper oxides have been of considerable interest as electrocatalysts for CO2 reduction (CO2R) in aqueous electrolytes. However, their role as an active catalyst in reducing the required overpotential and improving the selectivity of reaction compared with that of polycrystalline copper remains controversial. Here, we introduce the use of selected-ion flow …

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A comprehensive study of the leaching behavior and …

The leaching behavior of an Iranian copper oxide ore in sulphuric acid was investigated in detail to evaluate the influence of various factors, to optimize the dissolution conditions and to determine the kinetics of the leaching. The results indicated that the increase in the leaching time and temperature enhanced the leaching rate of copper. The leaching rate increased up to a certain …

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Copper oxide nanoparticle dissolution at alkaline pH is …

Dissolution of CuO nanoparticles, releasing Cu ions, is a primary mechanism of Cu interaction in the rooting zone of plants. CuO dissolution is sometimes incorrectly considered negligible at high pH, since complexation of Cu with dissolved organic matter may enhance nanoparticle dissolution. Therefore data o Environmental Science: Nano Recent HOT Articles

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Aggregation, Sedimentation, and Dissolution of Copper …

2019-6-1 · The rhizosphere is an essential pathway for the uptake of metal-based nanoparticles (MNPs) by plant roots. However, the interaction between root exudates and MNPs is still unclear. In this study, we initially identified the major low-molecular-weight organic acids (LMWOAs) in the rice root exudates using hydroponics. Then, the individual LMWOAs were added to CuO …

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Dissolution of Black Copper Oxides from a Leaching …

2020-7-28 · The residue from an oxidizing acid leaching (which initially contained copper oxide mineral, mainly chrysocolla) was used to evaluate the dissolution of black copper ore using a reducing leaching. The original copper oxide mineral and the residue of the acid oxidizing leaching (black copper) were characterized by SEM (JEOL USA Inc., Peabody, MA ...

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Extracting Copper by Lactic Acid from Copper Oxide Ore …

DOI: 10.1252/JCEJ.14WE032 Corpus ID: 94625555; Extracting Copper by Lactic Acid from Copper Oxide Ore and Dissolution Kinetics @article{Deng2015ExtractingCB, title={Extracting Copper by Lactic Acid from Copper Oxide Ore and Dissolution Kinetics}, author={Jiushuai Deng and Shuming Wen and Jian-ying Deng and Dandan Wu and Jing Yang}, journal={Journal of …

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Copper oxide nanoparticle dissolution at alkaline pH is ...

2020-9-17 · CuO dissolution is sometimes incorrectly considered negligible at high pH, since complexation of Cu with dissolved organic matter may enhance nanoparticle dissolution. Therefore data on the effects of plant-microbial-soil interactions on nanoparticle dissolution, particularly in alkaline soils, are needed.

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Dissolution Kinetics of Copper (II) Oxide in …

1996-6-1 · Results of dissolution studies showed that the copper oxide ore leaching in H 2 SO 4 solution increase with increasing time, pH, stirring speed and temperature at fixed H 2 SO 4 concentration of 0 ...

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A kinetic model of the dissolution of copper(II) oxide in …

2001-9-1 · The copper and oxide ion transfer processes are then coupled to satisfy the electric neutrality condition, and the dissolution rate is determined by the slower process, i.e., the metal ion transfer with EDTA at low pH and the oxide ion transfer with protons at high pH.

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Electrochemical copper dissolution: A benchmark for …

2020-6-1 · 1. Introduction. Copper is the noblest of the 3d transition metals. Depending on potential, it can form two stable passivating oxides at neutral pHs bined with other attributes, e.g. high electrical conductivity, these properties make Cu a …

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Dissolution of Cobalt from CoO/Al2O3 Catalyst with …

the dissolution of copper oxide (CuO) with several acids (HCl, H 2SO 4, HNO 3, and C 6H 8O 7) was studied to determine the better leachant. The results indicated that …

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Acid dissolution of copper oxides as a method for the …

Here we reported the acid dissolution of copper oxides as a methodology for the activation of Cu(0) wire used as catalyst in single-electron transfer living radical polymerization (SET-LRP). In this method, the oxide layer on the surface of commercial Cu(0) wire was removed by dissolution in a concentrated acid such as nitric acid, glacial ...

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Aggregation, Sedimentation, and Dissolution of Copper …

2019-6-1 · Citric acid, as the most abundant LMWOAs in rice root exudates, largely determined the aggregation, sedimentation, and dissolution of CuO NPs. The rhizosphere is an essential pathway for the uptake of metal-based nanoparticles (MNPs) by plant roots. However, the interaction between root exudates and MNPs is still unclear. In this study, we initially identified …

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Dissolution of Copper(II) Oxides in Sulfuric Acid Using …

2022-1-11 · Fractions of powdered copper(II) oxides with a particle size of 80–100 μm were used to study the dissolution kinetics. A weighed sample of powdered copper(II) oxide (to reach 0.0065 mol/L) was added to a reaction vessel containing an aqueous solution of sulfuric acid (1000 mL) with additives of ammonia, EDTA, and DTPA in the known concentration at fixed pH.

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The promoted dissolution of copper oxide nanoparticles …

The influence of dissolved humic acid (DHA) on the dissolution and dispersion of copper oxide nanoparticles (CuO NPs, 50 nm, 49.57 mg L-1) was therefore investigated in the present study. In addition to dispersing CuO NPs and reducing the size of the aggregates, the amount of released Cu from CuO NPs was found to increase over time with ...

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Extracting Copper by Lactic Acid from Copper Oxide Ore …

The empirical equation for the dissolution process was established to be 1/3ln (1− x )+ [ (1− x) −1/3 −1]= [1.94 C1.927P1.322 exp (−3507.34/ T )] t. The apparent activation energy was calculated to be 29.16 kJ/mol using this equation. Lactic acid can be employed as an organic leaching reagent to obtain a copper solution suitable for ...

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Dissolution of copper oxide nanoparticles is controlled by …

2021-1-31 · Dissolution is the primary process affecting the bioavailability and toxicity of nanoscale copper oxide (nano-CuO) to plants and soil organisms. In this study, particle morphology, organic acid, and soil properties were considered to understand the dissolution characteristics of nano-CuO in soil solutions.

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Dissolution of copper oxide nanoparticles is controlled by …

Dissolution is the primary process affecting the bioavailability and toxicity of nanoscale copper oxide (nano-CuO) to plants and soil organisms. In this study, particle morphology, organic acid, and soil properties were considered to understand the dissolution characteristics of …

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Dissolution Characteristics of Copper Oxide in Gas-liquid ...

2022-4-10 · As the applied voltage for plasma discharge and the concentration of the organic acid solution increased, the dissolution and removal power of the copper oxide layer increased. Solubility of copper oxide was more affected by the concentration in organic acid solution rather than the variation of plasma applied voltage.

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