chapter  4
32 Pages

Section 4: Clean water technology for control of arsenic

The effect of initial As(V) concentrations on adsorption were studied to evaluate the adsorption performance of the different synthesized materials. The batch adsorption experiments were carried out at the temperature of 298° K and the initial solutions pH was 7. The experiments were replicated three times and average results were used. The batch adsorption experiments were conducted in 150 mL flasks with 50 mL required concentrations of As(V) solution. The flasks were shaken in a thermostatic shaker at 150 rpm for 24 hours then filtered with 0.45 μm membrane. The practical water sample from Xikuangshan area was taken

1 INTRODUCTION

Arsenic (As) exists widely in water environment as a notoriously toxic element (Smedley & Kinniburgh, 2002). Layered Double Hydroxides (LDHs) as one kind of functional materials have been investigated and applied for As removal due to their excellent anion exchange capacity and large surface area (Goh et al., 2008). Based on our previous researches (Hong et al., 2014; Lu et al., 2015), the objective of this work is to study the adsorption performances of arsenic on different ferric based LDHs and discuss the effect of different laminate metals and interlayer anions in LDHs. Then explore the application possibility of the synthesized LDHs for treating the practical polluted water sample. A series of ferric based Layered Double Hydroxides (LDHs) with different laminate metals and interlayer anions and Corresponding Calcined Products (CLDHs) were synthesized and used to study the removal performance for arsenate in aqueous solutions. The possible mechanisms of arsenate adsorption on these LDHs were discussed. Furthermore, the selected CuMgFeLa-SO4-LDH was applied to treat practical As polluted water sample of Xikuangshan area and gave a satisfactory result.