Modification of Zn-Al Layered Double Hydroxide with a Anionic Food Dyes and Its Adsorption Behavior for Cd from Aqueous Solution

Absorption of Cd2+ onto modified LDH(Zn-Al) with anionic food dye(LDHQ) asadsorbent was studied following full LDH characterization by FT-IR spectroscopy, scanningelectron microscopy and BET( Brunauer, Emmet, and Teller). The effects of variables werestudied and optimized by a central composite design (CCD) combined with response surfacemethodology (RSM) and desirability function (DF). The good agreement between experimentaland prediction data at optimum values of all variables was explored. The optimum condition setas follow: 10-80 mg/l of Cd2+ concentration, pH 4.01 for sample solution, 0.09 g of LDHQ and56 min rotation with magnetic stirrer, and 20.2ºC of temperature as mass transfer process. Thesmall amount of proposed adsorbent (0.09 g) was applicable for removal of Cd (RE> 88%) at 56min with high adsorption capacity (10 mg/l).

کلیدواژه ها:

Layered Double Hydroxide ، Adsorption ، Anionic Food Dye