Adsorption of Ni(II) from model solutions using co-precipitated inorganic oxides

Abstract

The aim of this work was to obtain an inorganic oxide system containing silica and magnesium oxide, and characterized by specific physicochemical properties, in particular well-defined adsorption parameters. The preparation process was carried out according to a co-precipitation method using solutions of sodium silicate and selected inorganic magnesium salt. The oxide system obtained (MgOÁSiO 2 ) was used as a support (adsorbent) of nickel(II) ions, whose precursors were model solutions of nitrates. The effectiveness of the adsorption process was evaluated using many different analytical techniques, including atomic absorption spectroscopy, energy dispersive X-ray spectroscopy and equivalent point titration. Moreover the stability of adsorbent/adsorbate bonding was estimated. The oxide systems-adsorbents-used in the process were also analyzed according to their physicochemical properties, especially changes in adsorption parameters. The last part of the study involved evaluation of the kinetics of the adsorption process depending on time and the pH of the reaction system.

Preparation of porous resin with Schiff base chelating groups for removal of heavy metal ions from aqueous solutions

“…Techniques such as adsorption, ion exchange, dialysis, precipitation and extraction have been widely used to purify water containing excessive amounts of heavy metal ions. Adsorption technique has received much attention because it allows the use of many materials that are environmental friendly and have low production cost [1][2][3][4][5][6]. Moreover, the adsorbents are easy to remove from a purified solution which considerably reduces the total cost of overall process.…”

The effect of surface modification of mesoporous carbons on Auramine-O dye removal from water

“…To sum up, we can conclude that samples C KIT-6 -APS-30, C KIT-6 -APS-60 and C KIT-6 -APS-100, thanks to their specific physicochemical properties, make very efficient adsorbents of cationic dyes. The Langmuir and Freundlich isotherm models were used to interpret and evaluate the adsorption data from the experiments Ciesielczyk et al 2013Ciesielczyk et al , 2015bGoscianska et al 2014Goscianska et al , 2015aKlapiszewski et al 2015). The Langmuir adsorption isotherm is mathematically expressed as (Langmuir 1918):…”

The sol–gel approach as a method of synthesis of xMgO·ySiO2 powder with defined physicochemical properties including crystalline structure

“…The percentage mass contributions of each element constituting the material are quite high, considering that when xMgOÁySiO 2 is obtained in an aqueous system the MgO content is \20 %, SiO 2 \65 %, and the moisture is 18 % [31], resulting in the more hydrophilic nature of the synthetic powders obtained. In the case of the materials prepared via the sol-gel method, the moisture content is negligible, as a result of the synthesis methodology.…”