Application of modified nano-γ-alumina as an efficient adsorbent for removing malachite green (MG) from aqueous solution

Abstract

This study describes a simple, inexpensive and sensitive extraction procedure using γ-Al2O3 nanoparticles modified with sodiumdodecylsulfate, as an efficient solid phase, for removal, preconcentration and spectrophotometric determination of trace amounts of malachite green (MG) by fiber optic-linear array detection spectrophotometry. The properties of the produced modified nanoparticles were determined by FESEM and TEM. Various effective parameters on the preconcentration of MG, such as pH, sample volume, amount of sorbent, type, concentration, contact time, temperature, and volume of eluent were investigated. Under the optimized operating conditions, the calibration graph was linear over the range of 1.2–250 μg L−1 and relative standard deviation of 1.50% at 100 μg L−1 were obtained (n = 5). The limit of detection (S/N = 3) was obtained 0.34 μg L−1. The Langmuir adsorption capacity (qmax) was found to be 72.4 mg g−1 of the adsorbent. The method has been successfully used to determine of MG in fish farming water with satisfactory results.