Efficient removal of phenol from aqueous solutions using hydroxyapatite and substituted hydroxyapatites

Facile Removal of Pesticides from Aqueous Solutions Using Magnetic Nanocomposites. II. Adsorption experiments and kinetic study

“…The kinetic parameters are useful for the prediction of adsorption parameters, which are related with efficiency of adsorption. To determine the adsorption rate of thiamethoxam and deltamethrin on the prepared adsorbent three kinetic models such as Lagergren-first-order, pseudo-second-order kinetic models and intra-particle mass transfer diffusion model were applied in order to get insight on the adsorption process dynamics (a more detailed discussion regarding the kinetic models being previously presented [12]). The linear forms of these models were fitted based on the experimental data.…”

“…An adsorption isotherm provides a relationship between the solute concentration in the solution and the amount of pollutant adsorbed on the solid phase when the two phases are at equilibrium. The adsorption isotherm experimental data of pesticides were fitted by three common adsorption models: Langmuir, Freundlich and Sips (which is a combination of Langmuir and Freundlich) [12]. The theoretical parameters of adsorption isotherms along with regression coefficients (R 2 ) are presented in Table 3.…”

“…where: C0 and Ct are the initial concentration and the concentration of the pesticide at equilibrium (mg/L), V is the volume of the solution (L), and m is the amount of the adsorbent (g) [12].…”

Decorated Apatitic Materials: Synthesis, Characterization, and Potential Application

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The literature provides us several examples of apatitic materials in whose structure the calcium ions are substituted by different metals, which are remarkable for their applicability in heritage conservation, bioremediation, and biomedicine [1][2][3][4]. According to the desired properties, several methods were developed to obtain these apatitic materials.

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“…According to the desired properties, several methods were developed to obtain these apatitic materials. The decoration of the apatitic structure with metal and metal oxide nanoparticles is far less studied, even though it provides the development of more economical materials, using mild reaction parameters [2].Hydroxyapatite was prepared according to a recipe developed before in the laboratory [4]. For the incorporation of copper in the hydroxyapatite's structure, we studied two approaches: the decoration of hydroxyapatite with metal nanoparticles and metal oxide nanoparticles.…”