Facile synthesis of surface-functionalized magnetic nanocomposites for effectively selective adsorption of cationic dyes

Yani Hua,Chang Cui,Juan Xiao,Chuan Wang,Qinqin Zhang

doi:10.1186/s11671-018-2476-7

Abstract

A new magnetic nano-adsorbent, polycatechol modified Fe3O4 magnetic nanoparticles (Fe3O4/PCC MNPs) were prepared by a facile chemical coprecipitation method using iron salts and catechol solution as precursors. Fe3O4/PCC MNPs owned negatively charged surface with oxygen-containing groups and showed a strong adsorption capacity and fast adsorption rates for the removal of cationic dyes in water. The adsorption capacity of methylene blue (MB), cationic turquoise blue GB (GB), malachite green (MG), crystal violet (CV) and cationic pink FG (FG) were 60.06 mg g− 1, 70.97 mg g− 1, 66.84 mg g− 1, 66.01 mg g− 1 and 50.27 mg g− 1, respectively. The adsorption mechanism was proposed by the analyses of the adsorption isotherms and adsorption kinetics of cationic dyes on Fe3O4/PCC MNPs. Moreover, the cationic dyes adsorbed on the MNPs as a function of contact time, pH value, temperature, coexisting cationic ions and ion strength were also investigated. These results suggested that the Fe3O4/PCC MNPs is promising to be used as a magnetic adsorbent for selective adsorption of cationic dyes in wastewater treatment.

Highlights

IntroductionInorganic and organic wastes produced by human activities have resulted in high volumes of contaminated waters which threaten the health of human beings and other living organisms [1]
Characterization of Fe3O4/PCC Magnetic nanoparticles (MNPs) Figure 2a shows the magnetic hysteresis loops determined at room temperature for Fe3O4 and Fe3O4/PCC MNPs
The modification of polycatechol makes the Fe3O4/PCC MNPs much higher in crystallization, and smaller in particle size than Fe3O4 MNPs, which could be result in the higher saturation magnetization of Fe3O4/ PCC MNPs than Fe3O4 MNPs

Summary

Introduction

Inorganic and organic wastes produced by human activities have resulted in high volumes of contaminated waters which threaten the health of human beings and other living organisms [1]. Dye pollutants have attracted wide concerns from the public because of the high visibility and the toxic impact on biological organisms and the ecology [4]. Organic dyes have been extensively used in various branches such as textile, paper, printing, color photography, pharmaceutical industry, leather, cosmetics, plastic and other industries, which have been the major industrial wastewater sources [5]. The quantity of dye wastewater is extremely large, generally, the volume of discharged wastewater from each step of a textile operation is approximately at a high rate of between. It is necessary to select an appropriate method to remove dyes from wastewater before discharging into the environment

Methods

Results

Conclusion