Removal of Copper (II) Ions in Aqueous Solutions by Sorption onto Alkali Activated Fly Ash

Abstract

Abstract. Fly ash is a particulate material produced from coal combustion power plants with major components are silica, alumina, iron oxide, calcium oxide, magnesium oxide, and carbon which are ideal for metal adsorbents. The potential use of fly ash in the wastewater treatment process is obvious because it can be obtained cheaply in large quatities and it can be used as an adsorbent. However, fly ash still shows lower adsorption capacity unless it is activated. In this study, fly ash activated by NaOH 14 M and KOH 14 M solutions. The batch experiments were carried out to study the sorption of copper ions from aqueous on alkali activated fly ash. The influence of initial concentration and contact time were examined at constant pH and dose of adsorbent. The sorption capacity of copper ions increased with the initial concentration and contact time. The sorption capacities followed the order Na1>Ka1>FA. The adsorption isotherm model exhibited that the Langmuir model is very suitable with copper ions adsorption onto fly ash and alkali activated fly ash. Kinetic study shows that adsorption of copper ions onto FA, Na1, and Ka1 follows the pseudo second-order kinetics.

Removal of Toxic Copper Ion from Aqueous Media by Adsorption on Fly Ash-Derived Zeolites: Kinetic and Equilibrium Studies

“…In their investigations, many researchers tried to make fly ash more usable by its surface modification, subsequently trying to make useful products from the industrial waste. Therefore, fly ash treated with NaOH has become a subject of interest in heavy metal removal [20,[30][31][32][33][34].…”

Immobilization Approach as a Creative Strategy to Remove Reactive Dye Red 195 and Cu2+ Ions from Wastewater Using Environmentally Benign Geopolymer Cement

“…Geopolymers have increasingly garnered a lot of attention for the immobilization of harmful wastes in recent years [ 17 ]. For the Solidification/Stablization of hazardous pollutants, which are classified into heavy metals (cations and anions) and organic pollutants, geopolymers are currently the topic of extensive several studies [ 17 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 ]. Particularly geopolymers have the potential to offer extraordinarily long-term storage for the safe disposal of radioactive waste with high radioactivity [ 17 ].…”

Effective Removal of Copper Ion from Aqueous Solution using Beads of Chitosan-Choline Chloride/Glycerol Deep Eutectic Solvent

“…Recently, various adsorbents were used for the adsorption of Cu(II) from an aqueous solution such as activated carbon [5], zeolite materials [6], clay [7], and ash [8]. Activated carbon requires a high production cost and is difficult to regenerate [9].…”

“…Zeolite materials have a high affinity for water which may affect its adsorption capacity for Cu(II) [10]. Clay and ash have a low adsorption capacity for Cu(II) [8,11]. Therefore, in this paper, chitosan based adsorbent is introduced for the adsorption of heavy metal ions from water with low concentration [12].…”