Synthesis of Magnetic Halloysite Composites for the Effective Removal of Tetracycline Hydrochloride from Aqueous Solutions

Abstract

Herein, we explain an effective method for the synthesis of halloysite/CoFe 2 O 4 magnetic composites (magnetic halloysite nanotubes or MHNTs) and their use as as adsorbents to effectively remove tetracycline hydrochloride (TC-HCl) from aqueous solutions. The synthesized composites were characterized by the following methods: Fourier transform infrared, X-ray diffraction, transmission electron microscopy, vibrating sample magnetometry and atomic absorption spectrometry. Our study results indicated that MHNTs have strong magnetic (Ms = 34.02 emu/g) and low leakage properties. The adsorption capacities of MHNTs were investigated by performing a series of experiments with different pH, temperatures, initial concentrations and reaction time. The Langmuir isotherm model fitted to equilibrium data better than the Freundlich model. The kinetic properties of the composites were well-described by applying the pseudo-second-order equation. Even after carrying out two repeated experimental cycles, the reusability of the synthesized composites did not obviously degenerate.

Recent advances in halloysite nanotube derived composites for water treatment

“…In fact, due to the tubular structure and multiple surface groups, HNTs have gradually found many other applications for contaminant adsorption/degradation. As listed in Table 4, the adsorption/degradation of tetracycline, [96][97][98][99][100] ammonium ions, 101-104 2,4-dichlorophenoxyacetic acid, 105 chloroanilines, 106 phenol-based contaminant 107,108 5-aminosalicylic acid, 109 etc. by HNT-based composites from aqueous solutions has been reported.…”

“…The tunable nanoshell thickness would affect the saturation adsorption capacity for tetracycline and the largest saturation adsorption capacity appeared at a thickness of 35 nm. Wang et al 97 also reported a magnetic HNT-based composite of HNTs/CoFe 3 O 4 for the removal of tetracycline hydrochloride from aqueous solutions. The authors investigated the effects of pH, temperature, initial concentrations and reaction time on the adsorption capacity for tetracycline hydrochloride.…”

Superparamagnetic Core-Shell Polymeric Nanocomposites for Efficient Removal of Methylene Blue from Aqueous Solutions

“…A novel and quick method for selective adsorption of dibenzothiophene from gasoline using magnetic molecularly imprinted polymers as the adsorbent has also been described previously (Huang et al 2012). Moreover, an effective method for the synthesis of halloysite/CoFe 2 O 4 magnetic composites (magnetic halloysite nanotubes) and their use as adsorbents to effectively remove tetracycline hydrochloride from aqueous solutions has recently been explained (Guan et al 2012).…”

Effect of Surface Functionalization on the Adsorption of Arsenic Using Magnetite Nanocrystals

“…The removal of water pollutants using nanomaterials has become a very promising alternative due to the advantages exhibited by these nano-scale crystals compared with traditional methods of remediation. These advantages include high adsorption capacity per unit mass, absence of degradation by-products, environmental friendliness, capability for tailoring of the surface chemistry and the possibility of recovering the nanocrystals using an external magnetic field (Raven et al 1998;Liang et al 2010;Wang et al 2010;Zhang et al 2010;Giraldo and Moreno-Piraján 2012;Guan et al 2012;Atta et al 2013).…”