A water resistance magnetic graphene-anchored zeolitic imidazolate framework for efficient adsorption and removal of residual tetracyclines in wastewater | Zendy

Zelan Wang | Zendy; Xiaohong Chen | Zendy; Zhe Meng | Zendy; Mengxin Zhao | Zendy; Haijuan Zhan | Zendy; Wanyi Liu | Zendy

Open Access

A water resistance magnetic graphene-anchored zeolitic imidazolate framework for efficient adsorption and removal of residual tetracyclines in wastewater

Author(s) -

Zelan Wang,

Xiaohong Chen,

Zhe Meng,

Mengxin Zhao,

Haijuan Zhan,

Wanyi Liu

Publication year - 2020

Publication title -

water science and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.406

H-Index - 137

eISSN - 1996-9732

pISSN - 0273-1223

DOI - 10.2166/wst.2020.283

Subject(s) - adsorption , zeolitic imidazolate framework , imidazolate , aqueous solution , chemistry , chemical engineering , tetracycline , wastewater , specific surface area , graphene , nuclear chemistry , inorganic chemistry , metal organic framework , organic chemistry , waste management , catalysis , biochemistry , engineering , antibiotics

Water-resistant magnetic graphene-anchored zeolite imidazolate (Fe 3 O 4 /ZIF-8-G) composite materials with the largest surface area are formed by directly growing a hydrophobic ZIF-8 skeleton onto a graphene support through self-assembly in methanol. Fe 3 O 4 /ZIF-8-G hybrid composite has water resistance and super strong adsorption capacity, and is used as an effective adsorbent for adsorption and removal of residual tetracycline in wastewater. The morphologies and structure, as well as water resistance of Fe 3 O 4 /ZIF-8-G, were characterized using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetry analysis (TGA), N 2 adsorption and pH PZC . The adsorption for tetracycline (TC), oxytetracycline (OTC) and chlortetracycline (CTC) followed pseudo-second-order kinetics and fitted the Freundlich adsorption model with the simultaneous adsorption capacity for TC (382.58 mg g -1 ), OTC (565.94 mg g -1 ) and CTC (608.06 mg g -1 ) at pH 5-6 for 10 h. These were much higher than previously reported results for the removal of tetracycline from aqueous solutions. The used Fe 3 O 4 /ZIF-8-G could be effectively reused and recycled at least five times without significant loss of adsorption capacity. The hydrophobic and π-π interaction between the aromatic rings of TCs and the aromatic imidazole rings of the ZIF-8-G framework were the main adsorption mechanism on the surface of Fe 3 O 4 /ZIF-8-G. Constructing a hydrophobic surface of ZIF-8/G framework resulted in a reduction of the hydrophilic sites of the surface. This can improve stability and selective adsorption of ZIF-8-G framework. In addition, the results show no significant difference in the adsorption kinetics and adsorption capacity of Fe 3 O 4 /ZIF-8-G for TC, OTC and CTC in pure water and wastewater.

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