Manganese Coated Sand for Copper (II) Removal from Water in Batch Mode

Abstract

Abstract:Removal of heavy metals, such as copper ions, from water is important to protect human health and the environment. In this study, manganese coated sand (MCS) was used as an adsorbent to remove copper ions in a batch system. Equilibrium data were determined at a temperature of 25.6 °C and the Langmuir model was used to describe the experimental data. Mn-coating improved the removal of copper ions by 70% as compared to uncoated sand. Based on a kinetics study, the adsorption of copper ions on MCS was found to occur through a chemisorption process and the pseudo-second-order model was found to fit the kinetics experimental data well. Due to particle interactions, the equilibrium uptake was reduced as the ratio of sand to volume of solution increased. pH affected the removal of copper ions with lowest uptakes found at pH 3 and pHs >7, whilst at pHs in the range of 4 to 7, the uptake was highest and almost constant at the value of 0.0179 mg/g ± 4%. This study has also revealed that copper ions removal was dissolved oxygen (DO) dependent with the highest removal occurring at ambient DO concentration, which suggests that DO should be carefully studied when dealing with copper ions adsorption.

Adsorption Performance of Modified Fly Ash for Copper Ion Removal from Aqueous Solution

“…Although chemical precipitation is one of the methods that is most often used to remove copper ions, it has the disadvantage that it requires a large amount of chemicals in order to reduce metals to an allowable level for discharge [24]. Compared to the chemical precipitation technique, adsorption can remove metals over a wider pH range and at lower concentrations [25]. It has been demonstrated by several studies that the chemical precipitation method is limited.…”

Physical and biological removal of Microcystin-LR and other water contaminants in a biofilter using Manganese Dioxide coated sand and Graphene sand composites

“…In the past, various forms of metal oxides (iron, manganese) have shown effective functionalization over the sand particles which delivered better removal of metals and organic pollutants as compared to sand (Lai and Chen, 2001;Rachmawati et al, 2013). Also, MC-LR carries a negative charge (pH: 2.1-10.2) in water and is expected to get attracted towards metal oxide surface because of the possible positive charge interface.…”

The Influence of Salinity on the Removal of Ni and Zn by Sorption onto Iron Oxide- and Manganese Oxide-Coated Sand

“…Metal oxide-coated sands have been used for removing various heavy metals from water via the sorption mechanism [9]. For example, iron oxides are well-known to give a powerful effect on heavy metal sorption [10].…”

“…Iron oxide-and manganese oxide-coated sand (IOCS and MOCS) have been used as permeable reactive barrier (PRB) materials for treating heavy metal contamination in groundwater due to their ability to sorb various heavy metals, low-cost installation, and sustainable characteristics, replaceability, and long life-time [13]. Several studies reported that IOCS was satisfactory in removing Pb(II) [10], Cr(VI) and As(VI) [14], As(III) [15], Mo(VI) [16], and Cu(II) [17], whereas MOCS was effective in removing Cu(II) [9], Cr(VI), Pb(II), and Cd [12], and As(III) and As(VI) [18]. However, few studies have investigated the sorption of Ni and Zn onto IOCS and MOCS [11,17,19].…”