Magnetic Solid Phase Extraction and Removal of Five Cationic Dyes from Aqueous Solution Using Magnetite Nanoparticle Loaded Platanusorientalis Waste Leaves

Abstract

This paper reports the synthesis of a magnetic adsorbent for wastewater treatment purposes. In this regard, platanusorientalis waste leaves were chosen as a cheap material for preparing a magnetic adsorbent by loading magnetite nanoparticles on it. The synthesized adsorbent was characterized using scanning electron microscope and X-ray diffractometer. The synthesized adsorbent was used for magnetic solid phase extraction and removal of five cationic dyes including methyl violet (MV), methylene blue (MB), malachite green (MG), crystal violet (CV), and neutral red (NR) from aqueous solution as a model application. Different important factors affecting the adsorption process were optimized and the results showed that under the optimized conditions (pH 10 for CV, MV, MB and MG; pH 6 for NR; adsorbent dosage, 20 mg; agitation time, 25 min) efficient removal of the investigated dyes (adsorption capacities of 89.28-133.33 mg g -1 ) is achievable using the synthesized adsorbent. Furthermore, the reusability experiments showed that the adsorbent can be reused at least ten cycles without any significant loss in its sorption behavior.