Synthesis of CaO/Fe3O4 magnetic composite for the removal of Pb(II) and Co(II) from synthetic wastewater

Abstract

In this study, CaO was prepared from chicken egg shells. Then, to improve its properties, CaO/Fe 3 O 4 magnetic composite was synthesized and was used for the removal of lead (Pb (II)) and cobalt (Co (II)) ions from aqueous solutions. For this purpose, the effects of several parameters including pH, contact time, temperature, adsorption dosage and initial concentration of ions on the adsorption were studied. The optimum conditions of pH, contact time, temperature, adsorption dosage and initial concentration of Pb and Co ions were determined to be 6, 30 min, 25 °C, 2 g L-1 and 5 mg L-1 , respectively. The best efficiency for the adsorption of lead and cobalt ions was found to be 97.24 and 94.32 %, respectively. To investigate the equilibrium behaviour of adsorbent, Langmuir and Freundlich models were used. Also, pseudo-first order and pseudo-second order kinetic models were applied for the consideration of kinetic behaviours of experimental data. Additionally, the thermodynamic parameters including enthalpy, entropy and Gibbs energy were calculated for the adsorption of these heavy metal ions. The results showed that Freundlich isotherm model and the pseudo-second order kinetic model achieved the best match with the experimental data and the maximum adsorption capacities obtained from the Langmuir model were 227.27 and 217.39 mg g-1 for lead and cobalt, respectively. Also, thermodynamics studies revealed that the adsorption process of lead and cobalt ions using CaO/Fe 3 O 4 was suitable, spontaneous and exothermic.

Synthesis of Fe3O4 Nanoparticles Modified by Oak Shell for Treatment of Wastewater Containing Ni(II)

“…Two important isotherm models were selected in this study, Langmuir and Freundlich isotherm models. 20,23,25 Freundlich model is an empirical model and can describe adsorption capability of adsorbents. This model is applied for non-ideal adsorption on heterogeneous surfaces.…”

“…Also, it's an environment-friendly adsorbent, cheap and available. 18,19,20 The purpose of this study was to determine the potential and adsorption capacity of Fe 3 O 4 nanoparticles modified by oak shell (OSMMN) for the removal of Ni (II) from aqueous solution. The effect of various parameters such as namely contact time, adsorbent dose, pH, and the initial concentration of Ni(II) ions was studied.…”

Cadmium(II) Removal from Aqueous Solution Using Microporous Eggshell: Kinetic and Equilibrium Studies

“…The amount of used adsorbent is a significant parameter in adsorption process, as it determines the adsorption capacity in a certain concentration of adsorbed material [19][20]. The testing parameters for the range of adsorbent dosage (1-8 g) to remove cadmium ions are initial cadmium concentration 10 ppm, temperature 30 °C, contact time 80 min, mixing rate 200 rpm, pH = 9.…”

Chitosan/zeolite composite membranes for the eliminating of trace metal ions in the evacuation permeability process

“…3 Therefore, wastewater containing these metal ions causes numerous problems for living organisms, inc-84 TRUONG, TAKAOMI and BUI luding reduced growth and development, cancer, organ damage, nervous system damage, and death. [4][5][6][7] Thus, it is very important to establish removal technologies for industrial wastewater and then for it to be treated sensibly and completely by an advanced technology, such as ion exchange, precipitation, ultrafiltration, reverse osmosis, electro-dialysis, and membrane technology. [8][9][10] Among these options, biomass membranes are interesting materials for sustainable sources.…”