Sorption behavior of Sn(II) onto Haro river sand from aqueous acidic solutions

Abstract

The sorption behavior of Sn(II) onto Haro river sand has been examined with respect to nature of electrolyte, agitation time, dosage of sorbent and concentration of sorbate, Maximum sorption (95.5%) has been achieved from 0.034M hydrochloric acid solution after equilibrating sorbate (2.10-SM) and sorbent (50 mg) for 120 minutes at a V/W ratio of 90 cm3.g a. The kinetic data have been subjected to Morris-Weber and Lagergren equations. The kinetics of sorption proceeds a two stage process consisting of a relatively slow initial uptake followed by a much rapid increase in the sorption. The rate constant of intraparticle transport, Kd, comes out to be 8.75.10 -8 mol.g-kmin -m and the first order rate constant for sorption is 0.0416 min-l.The sorption data of Sn(II) onto Haro river sand followed Langmuir, Freundlich and Dubinin-Radushkevich (D-R) type isotherms. The Langmuir constant, Q, related to sorption capacity and, b, related to sorption energy are computed to be 10.6_+1.1 gmol.g -l and 1123+137 dm3-mo1-1, respectively. The D-R isotherm yields the values of C m = 348+151 gmol.g -1 and 13 =-0.01044+0.0008 molZ.kJ 2 and of E= 6.9_+0.3 kJ.mol -I. In all three isotherms correlation factor (T) is >0.99. The influence of common anions and cations on the sorption has been investigated. Zn(II), Mg(lI), oxalate, Pb(II), Mn(II) and tartrate reduce the sorption significantly whereas Fe(II) causes substantial increase in the sorption. It is essential that all ions causing a decrease in the sorption of Sn(II) must be absent from the sorptive solution otherwise low sorption yields would result.

Sorption profile of Cd(II) ions onto beach sand from aqueous solutions

“…Dilute aqueous solution of Cd(II) ions have been employed as models for low metal concentration wastewater. The sorbed concentration increases with initial concentration of sorbate and attains a constant value around 10 −4 M. A similar trend has been noticed for the sorption of Cd (II) ions onto Haro river sand [15] while monitoring the concentration of sorbate onto sorbent surface.…”

“…A and 1/n are minimum at lowest temperature investigated. The value of Freundlich parameters at 303 K are comparable to A = 1.38 ± 1.14 mmol g −1 and of 1/n = 0.67 ± 0.05 reported for Cd(II) ions sorption onto Haro river sand [15]. A general correlation of sorption equilibrium for microporous sorbent has been developed by Dubinin and coworkers [31] from the ideas put forward by Polanyi [32].…”

“…The results are registered in Table 2. The calculated value of X m at 303 K is very much higher as compare 0.23 mol g −1 reported for the sorption of Cd(II) ions onto Haro river sand [15]. The mean sorption energy E is found to vary within a narrow range of 10.13-11.48 kJ/mol which are in the range of 8-16 kJ/mol reported for ion exchange mechanism [35]:…”

“…Efforts have been made to develop methods for the removal of heavy metals from effluents using natural and waste materials as sorbents which are abundant and inexpensive, such as zeolite for lead, cadmium, zinc, chromium, nickel, copper and cobalt [9], flyash for lead [10], goethite for chromium, nickel, zinc, copper and cadmium [11], lignite for copper, cadmium and zinc [12], kaolin and ballclay for cadmium, zinc, chromium, nickel and copper [13]. Haro river sand for antimony [14], cadmium [15], and zinc [16], bed sediment for cadmium [17], blast furnace waste for zinc and cadmium [18].…”