Abstract
In this study, MIL-101(Fe), MIL-101(Fe,Cu), and graphene oxide (GO)/MIL-101(Fe,Cu) were synthesized to compose a novel sorbent. The adsorption properties of these three MOF-based composites were compared toward the removal of phosphate. Furthermore, the influencing factors including adsorption time, pH, temperature, and initial concentration on the adsorption capacity of phosphate on these materials as well as the reusability of the material were discussed. The structure of fabricated materials and the removal mechanism of phosphate on the composite material were analyzed by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), nitrogen adsorption-desorption analysis, and zeta potential. The results show that the maximum adsorption capacity of phosphate by the composite GO/MIL-101(Fe,Cu)-2% was 204.60 mg·g-1, which is higher than that of MIL-101(Fe,Cu) and MIL-101(Fe). likewise the specific surface area of GO/MIL-101(Fe,Cu)-2% is 778.11 m2/g is higher than that of MIL-101(Fe,Cuand MIL-101(Fe),which are 747.75 and 510.66 m2/g, respectively. The adsorption mechanism of phosphate is electrostatic attraction, forming coordination bonds and hydrogen bonds. The fabricated material is a promising adsorbent for the removal of phosphate with good reusability.
Highlights
Water pollution has gradually become a serious global issues (Santana et al 2020; Strokal et al 2020; Deletic et al 2019), due to rapid urbanization, industrialization, agriculture activities over past decades which caused in contamination of water bodies
Many MIL-101(Fe,Cu) crystals covered most of the Graphene Oxide (GO) surface, forming a new type of composite material with a large number of small crystals wrapped in large layers, formed a tight structure
The results indicate that the phosphate was successfully adsorbed on the composite material
Summary
Water pollution has gradually become a serious global issues (Santana et al 2020; Strokal et al 2020; Deletic et al 2019), due to rapid urbanization , industrialization, agriculture activities over past decades which caused in contamination of water bodies. Many industries discharge their sewage/waste into water bodies without pre-treatment which contains several traditional chemicals such as heavy metal ions, hazardous and toxic pollutants. One is excessive growth of alages (especially Cyanobacterai) which associated with accumulation of phosphors in water, result in eutrophication phenomenon (Sarma et al 2020; Huang et al.2017). Numerous technologies have been applied for the treatment of phosphate, such as biological method (Buhmann et al 2013), flocculation (Langer et al 2017)
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