Experimental Designs Applied to Desorption of Dichromate Ions after Separation and Preconcentration from Natural and Industrial Water by Modified Nano‐Alumina

Abstract

Nano-alumina modified by 9-aminoacridine was used as a sorbent for separation and determination of dichromate ions from water. Statistical method, based on surface response design, has been used for the optimization of dichromate ions elution from 9-aminoacridine nano-alumina. The adsorbed dichromate ions were found to be eluted quantitatively with 0.8 mol L À1 KCl in 1.6 mol L À1 NaOH which optimized by response surface design. Under optimum conditions, the accuracy, precision (relative standard deviation, RSD%) and R-square of the method were calculated as >98, <3, and >94%, respectively. Remarkable agreement between experimental and theoretical data was confirmed the predicted assumption. The method was applied to the simultaneous determination of dichromate in natural and industrial water samples. We also examined the retention of dichromate anions in the presence of Cl À , NO À 3 , and SO 2À 4 anions at pH 3.

Methods, Mechanisms and Typical Bio‐Indicators of Engineered Nanoparticle Ecotoxicology: An Overview

“…Nanosized materials become promising candidates for a wide variety of technological applications, e.g. photocatalyst , adsorbent , degradation agent . Nanotechnology is now maturing rapidly.…”

Dithizone-modified graphene oxide nano-sheet as a sorbent for pre-concentration and determination of cadmium and lead ions in food

“…In this regard, many sorbents such as nano alumina (Sayar et al, 2012a), carbon nanotubes (HerreraHerrera et al, 2012), Fe 3 O 4 (Sayar et al 2012b) various polymers (Wang et al, 2012), mesoporous silica (Ebrahimzadeh et al, 2013) and recently graphene (Sayar et al, 2014) have been applied to the determination of heavy metals.…”