Perovskite-type oxides are highly flexible materials that show properties beneficial for application in reverse water-gas shift processes (rWGS). Due to their stable nature, the ability incorporate catalytically active dopants lattice structure, and corresponding feature of nanoparticle exsolution, they promising candidates a design approach. On an industrial level, rWGS has proven be excellent...

Excessive soil acidity is known to have potential negative impacts on crop production. The chemical and physical characteristics of a liming material determine its capacity to neutralize soil acidity. The material CaCO3 equivalent (CCE) and fineness effectiveness estimates are included in effective CCE (ECCE) assessments of a material’s liming value and to decide application rates. The objectiv...

Potassium nitrate exhibits a reentrant phase transformation, where a metastable ferroelectric phase (γ -KNO3) is formed upon cooling from high temperature. The layered structure of this ferroelectric phase is composed of alternating layers of potassium ions and nitrate groups; wherein, a central nitrogen atom is coordinated by three equilateral triangular oxygen atoms. The group layer is locate...

The present study deals with the adsorptive removal of Escherichia coli (E. coli) by making use chitosan-silica/calcium carbonate (CS-SiO2/CaCO3) nanocomposites (NCs) where it was synthesized using waste eggshells and rice husks occurred natural sources. bioadsorbent CS-SiO2/CaCO3 NCs were incorporating eggshell-CaCO3 nanoparticles (NPs) husk-SiO2 NPs in chitosan solution. adsorbents characteri...

In this study we present a comparative quantification of CaCO3 production rates by rhodolith-forming coralline red algal communities situated in high polar latitudes and assess which environmental parameters control these production rates. The present rhodoliths act as ecosystem engineers, and their carbonate skeletons provide an important ecological niche to a variety of benthic organisms. The...

A previously published hydrothermal brine-river water mixing model driven by ocean crust production suggests that the molar Mg/Ca ratio of seawater (mMg/Ca(sw)) has varied significantly (approximately 1.0-5.2) over Precambrian time, resulting in six intervals of aragonite-favouring seas (mMg/Ca(sw) > 2) and five intervals of calcite-favouring seas (mMg/Ca(sw) < 2) since the Late Archaean. To ev...

The structural transformation in aragonite CaCO3 is simulated by molecular dynamics. The simulations are based on the potentials calculated from the Gordon-Kim modified electron gas formalism. We found two phase transitions in aragonite at high temperature.

Equations used to develop the CO2 -Ca-pH relationships in calcareous soils are reviewed. The equation Pco, (Ca) --(H) 2 Ke , is used to draw a three-dimensional surface and to derive three partial differential equations to illustrate the relationships between CO 2 partial pressure, Ca activity and pH. lc is a combination of Henry's Law constant, the first and second dissociation constants for c...

Artificial bone grafting is widely used in current orthopedic surgery for bone defect problems. Unfortunately, surgeons remain unsatisfied with the current commercially available products. One of the major complaints is that these products cannot provide sufficient mechanical strength to support the human skeletal structure. In this study, we aimed to develop a bone scaffold with better mechani...