dissolution Articles
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Effect of different water conditions on dissolution of nanosilver
This study evaluates the time-dependent dissolution of nanosilver (nAg) in common electrolytes and natural waters. nAg was synthesized via Tollens’ method using sodium citrate as stabilizer; its morphology, UV–Vis spectrum, and particle size were characterized. The dissolved silver was monitored over time using filtration, centrifugation, and inductively coupled plasma atomic ...
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The dissolution characteristics of calcium sulfide and utilization as a precipitation agent in acidic wastewater effluent treatment
The dissolution characteristics of CaS in the presence of CO2 has been investigated by monitoring sulfide speciation, solution conductivity and pH during dissolution. The sulfide speciation associated with CaS dissolution was utilized for metal precipitation from acidic wastewater effluents. The mechanism involved in the dissolution process was observed to be pH-dependent, characterized by ...
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Total Dynamics of Quartz–Water System at Ambient Conditions
New data on the dissolution and growth of quartz in acid, nearly neutral and slightly alkaline solutions at ambient conditions are presented. During batch dissolutions, aqueous Si-concentrations increased nonlinearly towards limit values. During parallel growth experiments, however, the high Si-concentrations corresponding to 13-fold supersaturation with respect to quartz did not decreased. To ...
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The removal of pyritic sulphur from a coal by ozone
The removal of pyritic sulphur from a Mexican sub-bituminous coal in different solutions was investigated. The effects of type and concentration of reagents used and the presence of ozone as oxidant, in a room temperature, were studied. The relevant factors in pyrite dissolution were determined by means of the statistical analysis of variance and optimised by the response surface method. Kinetic ...
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Degradation characteristics of polylactide in thermophilic anaerobic digestion with hyperthermophilic solubilization condition
To test whether hyperthermophilic treatment promotes polylactide (PLA) dissolution and methane conversion under anaerobic digestion conditions, a single thermophilic control reactor (55 °C) and a two-phase system consisting of a hyperthermophilic reactor (80 °C) and a thermophilic reactor (55 °C) were continuously fed with a mixture of PLA and artificial kitchen garbage. In Runs 1 and 2, the PLA ...
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Can Ants Help Slow Climate Change?
Ants are mighty little creatures. They inhabit every continent on Earth except Antarctica. They can lift 10 to 50 times their body weight. And now, one new study suggests, they may have the potential to help curb global warming. In “Ants as a Powerful Biotic Agent of Olivine and Plagioclase Dissolution,” Ronald Dorn of Arizona State University studied calcium-magnesium silicate ...
By Ensia
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The chemical evolution of groundwater in the Kerman plain aquifer, Iran
A comprehensive hydrogeochemical study was carried out in the Kerman Plain Aquifer, Iran. Groundwater samples were collected from 58 sites. Groundwater was analysed for major constituents (Na+, K+, Ca2+, Mg2+, Cl−, SO42− HCO3−. Different methods including composite diagrams, saturation indices and multivariate statistical methods were employed in assessing groundwater quality. ...
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Modelling dissolution of multi-component non-aqueous phase liquids using Pareto distributions
A distributed-site non-aqueous phase liquid (NAPL) dissolution model that can capture the physical process of dissolution is presented. The model uses a Pareto distribution of effective interfacial area and a correlation for the mass transfer. Model parameters are obtained using a formal constrained non-linear optimisation technique. The model is applied on effluent data from two soil column ...
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Role of low molecular weight organic acids on pyrite dissolution in aqueous systems: implications for catalytic chromium (VI) treatment
A systematic study combining batch experiments with spectroscopic analyses was carried out to better understand the effects of various organic acids on pyrite dissolution and subsequent Cr(VI) removal in aqueous systems. Our results suggest that organic acids had no effect on total Fe dissolution from pyrite relative to systems containing no acid. However, while nearly 100% of total Fe ...
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Adsorption of Trihydroxamate and Catecholate Siderophores on -iron (Hydr)oxides and their dissolution at pH 3.0 to 6.0
The adsorption of desferrioxamine (DFOB), acetyl desferrioxamine (DFOD1), and a catecholate derivative (DFOMTA)] on goethite (-FeOOH) and hematite (-Fe2O3) and mineral dissolution behavior at pH 3.0 to 6.0 were studied to yield an understanding of the mechanisms of siderophore complexation on phases and also to study how variations in siderophore molecular structure, as modified by proton ...
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Separation of metals and phosphorus from incinerated sewage sludge ash
Microbial acidification of incinerated sewage sludge ash and dissolution of metals from the acidified ash were investigated using a semi-batch reactor at different solid retention times (SRTs). The average pH values ranged from 0.91 to 1.2 at SRTs longer than 10 days, whereas the reduction of SRT to 4 days resulted in an increase in the pH value to about 2. The dissolution efficiencies of Al, ...
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Mechanisms of arsenic and fluoride release from Chacopampean sediments (Argentina)
We have examined the sources and mechanisms that control the release of fluoride and arsenate from fluvial and loess sediments collected from the Chacopampean region, Argentina. The two types of sediment show slight differences regarding the mechanism of release. In fluvial sediments the release of fluoride seems to be controlled by the dissolution of primary F–bearing minerals, such as ...
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Environmental fate of nanoparticles: physical chemical and biological aspects – a few snapshots
The environmental risk that nanomaterials can undergo is a major problem, which could prevent the commercial development of nanoproducts, especially in technology domains corresponding to large distribution: cosmetics, composite materials, civil engineering materials and leisure materials. The risk assessment is based on a complex approach, which implies the knowledge of the degradation ...
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Micronized CaCO3: a feasible alternative to limestone filtration for conditioning and (re)mineralization of drinking water?
Worldwide limestone filtration is used in many treatment plants for the conditioning and (re)mineralization of drinking water to increase concentrations of Ca2+ and HCO3−, pH and saturation index, thereby improving the quality of the water regarding corrosion control, buffering and taste. Typical applications include (very) soft groundwater with (very) low alkalinity and desalinated water. In ...
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Zinc oxide nanoparticles toxicity to Daphnia magna: Size dependent effects and dissolution
As the production of zinc oxide nanoparticles (ZnO‐NPs) and other metal oxides is exponentially increasing, it is important to investigate potential environmental and health impacts of such nanoparticles.Nanoparticles properties may change in different water media (e.g., size, dissolution rate) and their characterization is essential to derive conclusions towards toxicity results.Therefore, an ...
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Separation and identification of organic compounds from thermally dissolved Shengli lignite in a methanol/benzene mixed solvent
Thermal dissolution of Shengli lignite was conducted in a methanol/benzene mixed solvent at 240°C for 1 h. The soluble fraction was sequentially eluted with petroleum ether (PE) and carbon disulfide (CDS)/PE mixed solvents with increased CDS to PE ratio through a silica gel–packed column. A series of normal alkanes, polycyclic aromatics, methyl alkanoates, alkanoic acids, and fatty acid amides ...
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Dissolution kinetics and Zinc(II) recovery from spent automobile tyres by solvent extraction with Cyanex®272
The potential for solvent extraction using Cyanex?272 for the recovery of zinc from spent automobile tyre ash after prior leaching in hydrochloric acid has been investigated. Experimental data for the dissolution rates have been analysed with the shrinking core model for diffusion control with the surface chemical reaction as the rate controlling step. An extraction yield of 93.42% zinc by 0.032M ...
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Solution-Mining Modeling - Case Study
Project Description A confidential mining client was interested in evaluating various potential future solution-mining scenarios using a numerical model in order to assess potential ore recovery, capital costs, and cavern lifetimes, as well as to overall optimize the proposed mine plan. Modeling of solution mining requires that the key processes controlling the mineral dissolution are modeled; ...
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Cavitation reactors provide perfect mixing
Operations of cavitation reactors are based on activation of ultrasonic cavitation in the thin layer, processed liquid pumped over through the reactor as a result is formed stable dispersion of mixed components. On an entry of reactors, liquid is supplying and it has the greatest volume in a received emulsion. Through the second entry is supplying liquid component. Both entry fittings are ...
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Uncoated and coated ZnO nanoparticles life cycle in synthetic seawater
The increasing production of nanoparticles has raised strong concerns regarding their environmental release. In nanoparticles life cycle scenarios, marine systems constitute one of the main final compartments, and nanoparticles fate in these environments needs to be assessed. Here, dissolution kinetics of commercial uncoated and organic‐coated ZnO nanoparticles in synthetic seawater has been ...
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