Identification of potential soil adsorbent for the removal of hazardous metals from aqueous phase

Abstract

The present study attempted to identify the efficient hazardous metal-removing sorbent from specific types of soil, upper and middle layer shirasu, shell fossil, tuff, akadama and kanuma soils of Japan by physicochemical and metal (arsenic, cadmium and lead) removal characterizations. The physico-chemical characteristics of soil were evaluated using X-ray diffraction and scanning electron microscopy with energy dispersive spectroscopy techniques, whereas metal removal properties of soil were characterized by analyzing removal capacity and sorption kinetics of potential metal-removing soils. The chemical characteristics revealed that all soils are prevalently constituted of silicon dioxide (21.83-78.58 %), aluminum oxide (4.13-38 %) and ferrous oxide (0.835-7.7 %), whereas calcium oxide showed the highest percentage (65.36 %) followed by silicon dioxide (21.83 %) in tuff soil. The results demonstrated that arsenic removal efficiency was higher in elevated aluminum oxide-containing akadama (0.00452 mg/L/g/h) and kanuma (0.00225 mg/L/ g/h) soils, whereas cadmium (0.00634 mg/L/g/h) and lead (0.00693 mg/L/g/h) removal efficiencies were maximum in elevated calcium oxide-containing tuff soil. Physicochemical sorption and ion exchange processes are the metal removal mechanisms. The critical appraisal of three metal removal data also clearly revealed cadmium [ lead [ arsenic order of removal efficiency in different soils, except in tuff and akadama soils followed by lead [ cadmium [ arsenic. It clearly signified that each type of soil had a specific metal adsorption affinity which was regulated by the specific chemical composition. It may be concluded that akadama would be potential arsenicremoving and tuff would be efficient cadmium and leadremoving soil sorbents.

Removal of Anionic Dye by Natural Algerian Montmorillonite

“…The increase in methyl orange adsorption with the increase in adsorbent mass is attributed to increase in surface area of micro pores and the increase in availability of vacant adsorption sites. Similar results have been reported for the adsorption of methyl orange on Algerian MMT [18][19][20].…”

Biosorption of zinc from aqueous solution using leaves of Corchorus olitorius as a low‐cost biosorbent

“…Amount of Zn adsorbed onto the leaves of C. olitorius was calculated by following equations (Bhakta & Munekage, ; Bhakta, Rana, Lahiri, & Munekage, ).where q e is the amount of Zn adsorbed per gram of biosorbent, C i (mg/L) is the initial concentration of Zn. C e (mg/L) is the final concentration of Zn, M (g) is the amount of biosorbent, and V (L) is the volume of the solution.…”

“…The percentage of Zn sorbed by the biosorbent is calculated by the following equation (Bhakta & Munekage, ; Bhakta et al, ).…”

Development of Activated Carbon from Cotton Fibre Waste as Potential Mercury Adsorbent: Kinetic and Equilibrium Studies

“…The physical and chemical characterizations were carried out by capturing images of surface morphology and analyzing the chemical composition of the ACCF using scanning electron microscopy (SEM) with a jeol model equipment coupled with energy dispersive spectroscopy (EDS) facility (JSM-6500F, JEOL) in the Center for Advanced Marine Core Research, Kochi University, Japan, following the standard process [32]. The Hg 2+ adsorption capacity ( , mg/g) of ACCF at the equilibrium condition of the different experiments performed above was calculated following the mass balance relationship as…”