Extraction of Zn (II) ions in an polypropylene glycol 425 - sodium chloride - water aqueous two-phase system

Liquid-liquid extraction is one of the most used separation methods in chemical technology for recovery and separation of metal ions, other inorganic and organic substances. It is known that for extraction of Zn(II) the most frequently used extractants are D2EHPA, Aliquat 336, etc., diluted in an organic solvent. The use of these reagents does not meet the principles of “green” chemistry. Thus, in the present work, the extraction system based on polypropylene glycol 425 and sodium chloride for the extraction of Zn(II) ions from aqueous solutions is proposed. Equilibrium values of the distribution coefficient in the proposed aqueous two-phase system have been determined. Dependence of metal distribution coefficient on time of phase contact is obtained, time to reach equilibrium was 10 minutes. The isotherm of Zn(II) extraction obtained in the proposed system is a straight line, which indicates the independence of the distribution coefficient from the initial concentration of metal in the solution. The received experimental data can be used at the creation of “green” schemes of processing of Ni-MH batteries.

Tapered coated coreless optical fiber pollution sensor

This project is centered on the design and implementation of a pollution-sensitive optical fiber using a No core optical fiber. The sensors are used for estimating refractive indices and concentrations of various contaminated water (dirty pond water (contains mud and animal excrement), chemically contaminated water, oiled water, drainage water is an environmental pollutant, Sodium chloride water and sucrose water) and distilled water (The refractive index was measured in the laboratory with an Abbe refractometer device) as well as for evaluating the performance parameters such as sensitivity (11.11μm/RIU for tapered sensor 10min and 11.13μm/RIU for tapered sensor 20min) and resolution (0.000069 RIU for tapered No core 10min and 0.000079 RIU for 20min tapered) of sensor (multimode fiber-no core fiber-multimode fiber), with 40 nm thick gold (Au) metal film of the exposed sensing region).

Data-Driven Many-Body Models Enable a Quantitative Description of Chloride Hydration from Clusters to Bulk

<div> <div> <div> <p>We present a new data-driven potential energy function (PEF) describing chloride–water interactions which is developed within the many-body-energy (MB-nrg) theoretical framework. Besides quantitatively reproducing low-order many-body energy contributions, the new MB-nrg PEF is able to correctly predict the interaction energies of small chloride–water clusters calculated at the coupled cluster level of theory. Importantly, classical and quantum molecular dynamics simulations of a single chloride ion in water demonstrate that the new MB-nrg PEF predicts X-ray spectra in close agreement with the experimental results. Comparisons with an popular empirical model and a polarizable PEF emphasize the importance of an accurate representation of short-range many-body effect while demonstrating that pairwise additive representations of chloride–water and water–water interactions are inadequate for correctly representing the hydration structure of chloride in both gas-phase clusters and solution. We believe that the analyses presented in this study provide additional evidence for the accuracy and predictive ability of the MB-nrg PEFs which can then enable more realistic simulations of ionic aqueous systems in different environments. </p> </div> </div> </div>

Data-Driven Many-Body Models Enable a Quantitative Description of Chloride Hydration from Clusters to Bulk

<div> <div> <div> <p>We present a new data-driven potential energy function (PEF) describing chloride–water interactions which is developed within the many-body-energy (MB-nrg) theoretical framework. Besides quantitatively reproducing low-order many-body energy contributions, the new MB-nrg PEF is able to correctly predict the interaction energies of small chloride–water clusters calculated at the coupled cluster level of theory. Importantly, classical and quantum molecular dynamics simulations of a single chloride ion in water demonstrate that the new MB-nrg PEF predicts X-ray spectra in close agreement with the experimental results. Comparisons with an popular empirical model and a polarizable PEF emphasize the importance of an accurate representation of short-range many-body effect while demonstrating that pairwise additive representations of chloride–water and water–water interactions are inadequate for correctly representing the hydration structure of chloride in both gas-phase clusters and solution. We believe that the analyses presented in this study provide additional evidence for the accuracy and predictive ability of the MB-nrg PEFs which can then enable more realistic simulations of ionic aqueous systems in different environments. </p> </div> </div> </div>

Saltwater as a Disinfectant and Cleaning agent for Environmental Surfaces in the context of SARS-COV-II.

The WHO has declared the ongoing outbreak as a global public health emergency. Severe acute respiratory syndrome (SARS COV-II), the etiologic agent of COVID-19 has spread globally in a few months. It is a pandemic, surface to surface communicable disease. This review enlightens the preventive measures such as salt (sodium chloride) water as a selection of surface disinfectant. The application of saltwater is a sustainable and green concept and has several advantages including cost-effectiveness, ease of application, effective disinfection, on-the-spot production, safe for human beings and the environment. As compared to other chemical-based disinfectants and sanitizers, it is better to use on-hand techniques to clean vegetables and fruits, wooden surfaces, toys, and glasses with the most easily available, most economical, and non-toxic material of every house’s kitchen: A Common Salt. A simple saltwater solution containing approx 0.9-1.2% solution can be the cheapest, easiest, quickest, and safest way to clean different kinds of household surfaces to combat this pandemic situation.

etermination of Geothermal Reservoir Zone of Sorik Marapi, Mandailing Natal, North Sumatra

The Sorik Marapi Geothermal Power (SMGP) Field is located in Mandailing Natal (350 km to the southeast from Medan), North Sumatra. This study needed alteration mineral data validation with fluid geochemical characteristics from surface manifestations, and production wells were determined the geothermal reservoir zone. Therefore geothermometer and geoindicator calculations were used. Laboratory tests were carried out on 38 surface manifestations and 11 cutting samples of exploration well. Manifestations in this area include hot springs, fumaroles, and steaming ground. Alteration minerals found in the study area are anhydrite, epidote, calcite,chlorite, muscovite, pyrophyllite, and zeolite. The alteration zone is located in the zeolite zone, the epidote zone,and the anhydrite-sericite zone. Geochemical manifestations of surface and production wells containing chloride water, sulfate water, sulfate-chloride water, and bicarbonate water. The estimated reservoir temperature of SH-01 well shows temperatures ranging from 240–280˚C, SH-02 well shows temperatures of 249.89–302.92˚C, SH-03 well show temperatures of 231.09–280˚C. The mineral geothermometer calculation, which is correlated with the geochemical fluid geothermometer, shows valid results. This is evident from the estimated reservoir temperatures of the two geothermometers.