Application of sodium pyrophosphate modified bentonite (NPP-bentonite) for adsorption of Ni (II) from aqueous solution and electroplating wastewater was investigated. Batch experiments were carried out to find the effect of pH, adsorbent dose, contact time and initial metal ion concentration. Maximum Ni (II) adsorption of 87.30% was achieved at pH 6.0 with adsorbent dose of 2 g/L with contact time of 120 min and initial metal ion concentration of 50 mg/L. The equilibrium adsorption data fitted well to Langmuir and Freundlich isotherm models with Langmuir monolayer adsorption capacity of 30.30 mg/g and Freundlich adsorption capacity of 3.98 (mg/g)/(mg/L)1/n. The practical applicability of NPP-bentonite as potential adsorbent for Ni (II) removal from electroplating wastewater has been proved.
NPP-bentonite, Adsorption, Nickel, Isotherm, Electroplating wastewater
