Heavy metal removal by clinoptilolite. An equilibrium study in multi-component systems The activity coefficients of ions in the liquid phase were determined using Pitzer's model; activity coefficients in the solid phase were estimated by ... R Petrus,Jolanta K. Warcho - 《Water Research》 被引量...
Using the Henderson–Hasselbalch equation (also in the text), ratios of the populations of protonated and deprotonated species can be calculated given the pKa of the thiol of interest and the pH of the system (shown in the table). (1)pH=pKa+log[A−]/[HA]. In this equation, HA ...
Platinum group metal-free (PGM-free) catalysts are a low-cost alternative to expensive PGM catalysts for polymer electrolyte fuel cells. However, due to the low volumetric activity of PGM-free catalysts, the catalyst layer thickness of the PGM-free catalyst electrode is an order of magnitude ...
The process comprises the steps of: a) oxidizing the one or more Group VIB metals to one or more Group VIB metal oxides; b) separating the one or more Group VIB metal oxides from the one or more Group VIII metals; c) dissolving the one or more Group VIB metal oxides in water to ...
A dynamical semigroup Fokker-Planck equation, which meanwhile satisfies also the semiclassical detailed-balance relation at arbitrary temperatures, is constructed and further applied to nonlinear spectroscopic processes of two-surface molecular systems in condensed phases. Included in dissipation are the T[...
2. The equilibrium potential is set to be 1.23 V versus reversible hydrogen electrode (RHE) (according to Nernst equation, for each step in ORR process with 4.92 V/4 = 1.23 V vs. RHE), where the reaction free energies for all electron-transfer steps are zero for the ideal ...
The adsorption kinetic could be well fitted by the pseudo-second-order equation. And the adsorption isotherm could be well fitted by the Langmuir model. The estimated maximum adsorption capacity was 105.2 mg g−1, nearly similar with cation exchange capacity (CEC) of RPFC-I fibers. Results...
Preparation of phosphate group functionalized magnetic metal–organic frameworks nanoparticles (Fe3O4@SiO2@UiO2-66-TPP) 15 mg phytic acid sodium salt was dissolved in the mixed solution of 4 mL water and 20 mL CH3COOH (2%, v/v), and then 40 mg Fe3O4@SiO2@UiO-66-NH2was dispersed in ...
The hydroxyl functional groups (shown in Table 6.2) that exist in water consist of a hydrogen atom and an oxygen atom bonded together. It is the dominant reactive surface functional group for clay minerals, amorphous silicate minerals, metal oxides, oxyhydroxides, and hydroxides (Sposito, 1989)...
Silanols react readily with oxygen- or nitrogen-containing compounds such as glycols, water, alcohols, amines, divalent metal salts and with each other. Among these reactions, that with soluble zinc is the major source of silica's unique compounding characteristics. The reaction, as shown in ...