Remediation of water tainted with noxious aspirin and fluoride ion using UiO-66-NH2 loaded peanut shell.

Abstract

One green adsorbent, UiO-66-NH2 modified peanut shell (c-PS-MOF), was prepared in a green synthetic route for improving the capture level of aspirin (ASP) and fluoride ion (F-). The adsorption properties of c-PS-MOF were evaluated by batch experiments and its physicochemical properties were explored by various characterization methods. The results showed that c-PS-MOF exhibited a wide range of pH applications (ASP: 2-10; F-: 3-12) and high salt resistance in the capturing processes of ASP and F-. The unit adsorption capacity of c-PS-MOF was as high as 84.7mg·g-1 for ASP as pH = 3 and 11.2mg·g-1 for F- under pH = 6 at 303K from Langmuir model, respectively. When the solid-liquid ratio was 2g·L-1, the content of ASP (C0 = 100mg·L-1) and F- (C0 = 20mg·L-1) in solution can be reduced to 0.48mg·L-1 and 1.05mg·L-1 separately. The recycling of c-PS-MOF can be realized with 5mmol·L-1 NaOH as eluent. Analysis of simulated water samples showed that c-PS-MOF could be used to remove ASP and F- from actual water. The c-PS-MOF is promising to bind ASP and F- from rivers, lakes, etc.