Hydrophobic Fluorous Metal–Organic Framework Nanoadsorbent for Removal of Hazardous Wastes from Water

Abstract

The spill of oil in the ocean and the abuse of pharmaceutical and personal care products in water systems would pose a direct threat to the environment and human health. Metal–organic frameworks (MOFs) can serve as promising adsorbents to solve these problems, but most MOFs are unstable in water, thereby limiting their applications. To address these issues, we proposed a simple postsynthesis modification strategy with perfluoroalkyl acid to produce hydrophobic MOF nanoadsorbents. The modified nanomaterial retained its original structure and porosity, while its water contact angle increased to 145°. The hydrophobic nanomaterial showed an obvious increase in the adsorption capacity for a diversity of organic solvents and gave an outstanding recycling performance. It also exhibited good oil–water separation capabilities. In addition, we investigated the efficiency of UiO-66-F in the adsorption of carbamazepine from its aqueous solutions, and it was found that the framework’s ability to remove carbamazepine in water increased remarkably. Furthermore, the adsorption isotherms and kinetics analyses of the adsorption were conducted, and the results fitted with the Langmuir isotherm model and the pseudo-second-order kinetic model, respectively. Therefore, the hydrophobic perfluoroalkyl MOF nanomaterial UiO-66-F can be deemed as a promising matrix to capture hazardous wastes from water.

Adsorption of Inositol Phosphate on Hydroxyapatite Powder with High Specific Surface Area

“…We focused then on the adsorption mechanism of the IP6 on the HapHS powder. The experimental data on the adsorption of IP6 shown in Figure 7 were tested using the Langmuir and Freundlich isotherm models, as follows: where K L is the Langmuir adsorption equilibrium constant, q max (mg/g) is the maximum IP6 adsorption capacity, q e (mg/g) is the amount of IP6 adsorption at equilibrium concentration, C e (mg/cm 3 ) is the equilibrium concentration of IP6, and K F and n are the Freundlich adsorption equilibrium constants related to the adsorption capacity and intensity, respectively [ 32 , 33 , 34 ].…”

Hierarchical porous metal–organic framework materials for efficient oil–water separation

“…Since uorides and alkyls have low SFEs, highly uorinated and alkylated linkers are oen employed for designing hydrophobic MOFs. [52][53][54] A number of different types of uorinated and alkylated ligands have been synthesized for the preparation of hydrophobic MOFs, as listed in Fig. 3.…”

“…Crystals, nanosheets and powders of hydrophobic MOFs have been utilized to design oil/water ltration systems. 21,54,[90][91][92][93][94] All the MOFs belonging to this class have a hydrophobic character generated by highly alkylated, arylated or uorinated linkers. These linkers can either function as hydrophobic MOF constituents or can be installed via post-synthetic modication.…”

Synthesis of Hierarchical‐Porous Fluorinated Metal–Organic Frameworks with Superior Toluene Adsorption Properties

“…Generally, fluorination is deemed an effective method for generating hydrophobic frameworks [7] . Moreover, the F‐MOFs exhibit improved adsorption‐ability under humid conditions compared to activated carbon and zeolites [8] . However, post‐fluorination has disadvantages such as complex operation, easy plugging of pores, and poor thermostability [9] .…”