used in this study
was the commercially available Cloisite 30B nanoclay, a
natural montmorillonite modified with a quaternary ammonium salt
with the hydroxyl groups and long straight alkyl chain supplied by
Southern Clay (USA) Products. The organic modifier is a methyl, tallow,
bis-2-hydroxyethyl, quaternary ammonium. N-Methyl-2-Pyrrolidon
(NMP) as solvent, polyethylene glycol (PEG) (Mw = 20,000 (g/gmol))
as pore forming and Na2HAsO4·7H2O to prepare arsenate solutions
were purchased from Merck, respectively. All materials were used as
received.