Removal of Lead Ions from Industrial Wastewater Using Magnetite Loaded On Silica Support

Abstract

A SERIES of magnetite supported silica (Fe 3 O 4 /SiO 2 ) nanoparticles with different Fe 3 O 4 loadings was prepared by co-precipitation method. Structural characteristics of the prepared adsorbents were investigated by X-ray diffraction (XRD), and transmission electron microscope (TEM). The magnetic property was also determined. The adsorption performance of the samples was assessed in the removal of lead ions from aqueous solution. Experiments have been performed to study the effects of several parameters including solution pH, time, initial metal ion concentration and adsorbent weight on the sorption efficiency. The results of the adsorption experiments indicated that the obtained adsorbents have excellent adsorption ability for the removal of lead ions.

The removal of zinc ions from their aqueous solutions by Cr2O3 nanoparticles synthesized via the UV-irradiation method

“…Later, chromium oxides (Cr 2 O 3 ) have attracted great attention due to their contribution in many applications, such as coating for high temperature [7], the UV and microwave shielding [8], green pigments [9], solar energy collectors [10], photonic and electronic devices, heterogeneous catalysts [11,12] and hydrogen storage [13]. Moreover, as many nanometal oxides, such as aluminum oxides [14], titanium oxides [15], cupper oxides [16], magnesium oxides [17], iron oxides [18,19] and cerium oxides [20] have been shown an axcellent heavey metal adsoption from aqueous solutions, the spherical Cr 2 O 3 nanoparticles demonstrates a remarkable capacity in water treatment to extract azo-dye pollutant [21]. The Cr 2 O 3 nanospheries with excellent dye absorptions are therefore expected to be useful in alternative technologies for absorption.…”

Porous polyvinyl formaldehyde / MWCNTs foam for Pb+2 removal from water

“…This model assumes that the rate of adsorption is dependent on the square of the number of free sites. Equation ( 4) describes the pseudo second-order kinetic model: (4) where, qe and qt (mg/g) are the adsorption value of lead ions at equilibrium and time t, respectively. K2 (min −1 ) is the reaction rate constant of the pseudo-second-order model.…”

“…Unfortunately, heavy metal ions are not biodegradable and proved to be accumulated in the body causing many diseases [1][2][3]. Among them, as non-biodegradable pollutant, lead can be considered as one of the most poisonous heavy metal which poses a direct threat for both humans and animals by accumulating in the living tissues throughout the food chains causing serious health problems [4,5]. Thus, removal of heavy metals from contaminated aqueous mediums has become very essential process.…”