Retention of nickel from aqueous solutions using iron oxide and manganese oxide coated sand: kinetic and thermodynamic studies

Abstract

In this study, the removal of nickel ions from aqueous solutions using iron oxide and manganese oxide coated sand (ICS and MCS) under different experimental conditions was investigated. The effect of metal concentration, contact time, solution pH and temperature on the amount of Ni(II) sorbed was studied and discussed. Langmuir and Freundlich isotherm constants and correlation coefficients for the present systems at different temperatures were calculated and compared. The equilibrium process was well described by the Langmuir isotherm model: the maximum sorption capacities (at 29 K) were 2.73 mg Ni/g and 3.33 mg Ni/g of sorbent for ICS and MCS, respectively. Isotherms were also used to evaluate the thermodynamic parameters (deltaG degrees, deltaH degrees, deltaS degrees) of adsorption. The sorption kinetics were tested for the pseudo-first-order, pseudo-second-order and intra-particle diffusion models. Good correlation coefficients were obtained for the pseudo-second-order kinetic model, showing that the nickel uptake process followed the pseudo-second-order rate expression.

Technologies for Arsenic Removal from Water: Current Status and Future Perspectives

“…A first solution is the impregnation of nanoparticles into porous materials or surface coatings [ 68 , 138 ]. Some of the widely used host substrates are activated carbon [ 139 ], bentonite [ 140 ], sand [ 141 ], alumina membranes [ 142 ], and ion-exchange resins [ 143 ]. As for surface coating, there have been reports mentioning that a thick layer of surface modifiers may reduce the reaction rate, although removal capacity was enhanced due to an increased number of active sites [ 101 ].…”

A review of the use of red mud as adsorbent for the removal of toxic pollutants from water and wastewater

“…However, its widespread use in water treatment is sometimes restricted owing to its high cost. As such, for quite some time, efforts have been made to develop inexpensive adsorbents using various materials [14][15][16][17][18][19]. However, the search is still going on to find better alternatives to activated carbon.…”

Removal of nickel from aqueous solution using magnesite tailing

“…It was seen that the adsorption capacity of the magnesite tailing was higher than those of kaolinite, clinoptilolite, calcined Bofe bentonite clay, dolomite, iron oxide, and manganese oxide-coated sand [5,17,20,21,33]. In addition, it can be obtained cheaply in large amounts.…”