Sorption of metal ions from aqueous solutions by thermally activated electroplating sludge

Abstract

The sludge waste obtained from metal plating industries has been converted into a low-cost sorbent material. The thermally treated activated electroplating sludge is characterized, as well as its use for the removal of metal ions. The effect of contact time, the pH, the sorbate concentrations, the mixture of metal ions and the temperature on the sorption of lead, copper, zinc and nickel were studied in batch experiments. Kinetic studies were undertaken in order to make clear the mechanism of the process. The sorption on electroplating sludge follows both Langmuir and Freundlich's models. The degree of removal of metal ions was found to be dependent on the final pH of the contact solutions. The percentage of the sorbed metal ions rapidly rises at pH above 4.2-5.5. Some experiments were also carried out for chemical regeneration of the exhausted electroplating sludge.The order of preference of sorption of meal ions in a single and in a multicomponent system has been established.

Use of cellulose-based wastes for adsorption of dyes from aqueous solutions

“…The initial curved portion is attributed to the bulk diffusion and the linear portion to the intraparticle diffusion. These phenomena have been reported for the adsorption of Cd 2+ on waste Fe(III)/Cr(III) hydroxide [22] and on thermally activated electroplating sludge [23]. At a certain time limit (about 20 min), the curves reveal a linear characteristic that the intraparticle diffusion controls the adsorption process (Figs.…”

Removal of Lead Ions by Keramzite Sand Coated With Electroplating Sludge Under Dynamic Conditions

“…The conditions for carrying out the thermal modification of the electroplating sludge, the main characteristics of the electroplating sludge and the obtained sorbent as well as the adsorption properties of the modified sorbent were reported in another paper (9). The keramzite is a porous material that is obtained under fast thermal treatment of easily fusible clays in rotating furnace at 1100-1200 C. The main composition of keramzite sand is a quartz form of -SiO 2 , insoluble aluminosilicates and amorphous glass phase.…”

“…It is mainly derived from the large adsorption capacity and the slow diffusion rate in the sorbent particles. The thermally activated electroplating sludge has been used as a sorbent for the removal of heavy metal ions from aqueous solutions by a batch operation technique (9). The obtained sorbents combine the sorption ability of the coating hydrated metal oxides with the filtration properties of the sand.…”