Removal of Heavy Metals and Dyes Using Low Cost Adsorbents from Aqueous Medium-, A Review

Abstract

The removal of heavy metals and dyes from waste water using low cost adsorbents is being widely used by various researchers. In recent years, the uses of various natural adsorbents have been widely used as a replacement for the current costly methods of treatment of waste water. In this review, an extensive list of recent investigations and literature has been compiled to provide information on a wide range of low cost adsorbents.

Separation of transition metals and chelated complexes in wastewaters

“…For example, Sud et al [137] and Demirbas [138] reviewed the use of agricultural waste materials to sequester metallic ions from wastewaters. Other notable studies were published by Mohd Salleh et al [139], Geetha and Belagali [140], and Rangabhashiyam et al [141]. Below are just a few interesting examples of natural materials deployment, prolifically reported.…”

“…Other notable studies were published by Mohd Salleh et al . , Geetha and Belagali , and Rangabhashiyam et al . .…”

Influence of Acid Activation on Natural Calcium Montmorillonite Clay

“…1 It shows bleaching action 2,3 and also can be effectively used as adsorbent for adsorption of harmful substances like dye 4,5 , heavy metal ions 6,7 from their sources. Its adsorption capacity as adsorbent and bleaching action can be increased manifold if it is activated particularly with acid.…”

Arsenic [As (III)] Removal Using Almond Shells

“…In order to find the optimum pH, the synthetic Arsenic solution having concentration of 0.5 mg/L was used, this solution was taken in 1 liter beakers and the pH of the solution was varied from 2, 3,4,5,6,7,8,9,10. pH was adjusted by adding HCl /NaOH.…”