Ultrasound-assisted synthesis of tetraethylenepentamine-modified graphene oxide/dispersive Fe 3 O 4 composites with enha
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ORIGINAL PAPER
Ultrasound‑assisted synthesis of tetraethylenepentamine‑modified graphene oxide/dispersive Fe3O4 composites with enhanced adsorption capacity for allergenic disperse dyes Yong‑Gang Zhao1,2 · Yan Zhu3 · Yun Zhang1 · Ming‑Li Ye4 Received: 7 June 2020 / Accepted: 12 October 2020 © Iranian Chemical Society 2020
Abstract A novel tetraethylenepentamine-modified graphene oxide/dispersive F e3O4 magnetic composites (TEPA-MGO-dF) has been prepared through a simple and low-cost process using ultrasound-assisted hydrothermal method. The introduction of ultrasound in the reaction system is critical for reducing the occurrence of magnetic Fe3O4 nanoparticles aggregated together as well as GO sheets stacked layer by layer. Transmission electron microscopy analysis reveals that, with ultrasound, magnetic Fe3O4 nanoparticles own quasi-monodisperse size, and evenly bonded onto the surface of monodermic GO substrates. When used as adsorbents, TEPA-MGO-dF can high-efficiently remove allergenic disperse dyes from water with much higher adsorption capacities than tetraethylenepentamine-modified graphene oxide/aggregated F e3O4 magnetic composites (TEPA-MGO-aF) prepared without ultrasound-assisted, indicating great potential for use in water treatment. The adsorption properties of TEPA-MGO-dF for the removal of allergenic disperse dyes in wastewater were deeply investigated. The results showed adsorption efficiency was highly pH dependent and adsorption mechanism of the dyes adsorption onto adsorbents could be related with two driving force, i.e., hydrogen bonding and π-π stacking interactions. Furthermore, various isotherms have been used to fit the adsorption data, which was effectively described by the Langmuir model with all R2 > 0.99, and the adsorption kinetic of dyes onto TEPA-MGO-dF can be predicted by the pseudo-second-order model. Keywords Ultrasound-assisted hydrothermal method · Tetraethylenepentamine-modified graphene oxide/dispersive Fe3O4 magnetic composites (TEPA-MGO-dF) · Allergenic disperse dyes · Adsorption · Langmuir isotherm
Introduction
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s13738-020-02099-3) contains supplementary material, which is available to authorized users. * Yong‑Gang Zhao [email protected] * Yan Zhu [email protected] 1
Department of Chemistry, Zhejiang University, Hangzhou 310027, Zhejiang, China
2
Ningbo Municipal Center for Disease Control and Prevention, Ningbo 315010, Zhejiang, China
3
Department of Environment Engineering, Wuchang University Technology, Wuhan 430223, Hubei, China
4
College of Biological and Environmental Engineering, Zhejiang Shuren University, Hangzhou 310015, China
Today, with severe water shortage in worldwide, and the growing consumption of domestic water and agriculture water, there has been increased public and scientific attention on water pollution. Wastewater of the printing ink, leather, textile and cosmetic industries is known to contain a considerable large amount of d
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