According to strong physiochemical stability, desirable hydrophobic and oleophobic properties and high surface activity with appreciable resistance intensive light, heat, and microbial action, perfluorinated carboxylic acid(PFOA) is extensively used across the world. Due to its bioaccumulation and recalcitrance to environmental degradation, the presence of PFOA is ubiquitous, especially in water medium. Currently, many techniques are applied to remove PFOA, reducing its threat to the natural ecosystem and human health as a durable organic contaminant. Featured by energy-efficient, low-cost, easy operated and effective, adsorption method becomes a promising approach. Metal Organic Framework(MOFs) become an applicable adsorbent attribute to its excellent designability and easily produced modular synthesis. Based on recent PFOA removal techniques in water environments, this research focused on the low polarized and non-aromatic properties in PFOA, aimed for increasing hydrophobic effects, applied amino group and graphene oxide(GO) surface modification on high heat, chemical, water and mechanical stable and readily substituted Zirconium-based metal organic framework UiO-66. After the characterization of Powder X-ray Diffraction(PXRD), Scanning Electron Microscope(SEM), Fourier-Transform Infrared Spectroscopy(FT-IR), Nitrogen Adsorption/desorption Isotherms, Contact Angle test and Zeta Potential analysis, a simple hydrothermal synthesis method of UiO-66 and its decorated MOFs was established. The adsorption capability and mechanism were studied through the adsorption kinetics and isotherms. The experiment indicates the introduction of the amino group not only enlarged the pore size, but also displayed strong hydrophobic effects, significantly enhanced the adsorption capacity(maximum capacity is 1653mg/g). Pseudo-second-order and Freundlich model suggests the adsorption mechanism of PFOA on UiO-66-NH<sub>2</sub>. The results proposed the application of modifying UiO-66 framework with amino group would strengthen its hydrophobicity, as well as provide verification for a promising wastewater management approach which utilized the designability of metal organic network, intentionally introduced particular functional group for modification according to the properties of the pollutant, and fabricatde specialized adsorbent to reinforce the adsorption elimination of containments.

Tailoring Zr-based metal–organic frameworks by decorating UiO-66 with amino group for adsorption removal of perfluorooctanoic acid from water

ACS Spring 2022

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