Use of red mud for toxic metals removal: The case of nickel

Abstract

The presence of red mud was found to remove effectively nickel ions from dilute aqueous solutions (50 mg dm−3). Red mud, being an industrial solid by‐product/waste from alumina production during bauxite processing, was found to act simultaneously as an alkalinity regulator, causing precipitation of nickel as the insoluble hydroxide, as an adsorbent of the formed nickel hydroxide and as a flocculant of the resultant fine particulate matter. Sedimentation was subsequently considered as a possible solid/liquid separation technique. Various parameters, such as dispersion pH, red mud and nickel concentrations and ζ‐potential, were examined and promising results were obtained.

Effect of grinding and heating on Ni2+ uptake properties of waste paper sludge

“…A similar pH dependency has been reported for red mud (Zouboulis and Kydros, 1993), activated carbon (Kadirvelu et al, 2001), blast furnace slag (Dimitrova, 1996), bentonite (Banat et al, 2002), illite (Echeverrı´a et al, 2003) and gehlenite (Jha et al, 2004).…”

Continuous biosorption of Pb/Cu and Pb/Cd in fixed-bed column using algae Gelidium and granulated agar extraction algal waste

“…Biosorption has been successfully used in the treatment of metal contaminated water using low cost materials, such as, marine algae [1], bacteria [2], fungi [3], industrial wastes [4,5] and several other materials.…”

Biosorption optimization of nickel removal from water using Punica granatum peel waste

“…An adsorption capacity of ca. 52 mg g −1 was observed for nickel on pomegranate peel adsorbent at 25 • C. Adsorption capacities from the present study were compared with other adsorbents from previous studies [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] and are shown in Table 2. It is evident that the prepared adsorbent shows comparable adsorption efficacy for nickel removal from water.…”