Likang Fu,Shixing Wang,Guo Lin,Libo Zhang,Qiming Liu,Ju Fang,Chenhuinan Wei,Gang Liu
A new MOFs adsorbent was prepared by post-functionalization of UiO-66-NH 2 with 2,5-Dimercapto-1,3,4-thiadiazole and utilized to remove the Hg(II) in water selectively. The UiO-66-types were detected by Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscope (FESEM), Brunauer-Emmett-Teller (BET) and zeta potential instruments. The adsorption properties of the new MOFs adsorbent were investigated by batch experiments. The actual maximum adsorption amount was 670.5 mg/g at the optimal pH of 3. Adsorption kinetic and isotherm models were exceedingly fitted to pseudo-second-order and Langmuir/Dubinin-Radushkevich, respectively. The adsorption process and mode were geared to monolayer and chemisorption, the removal rate was directly proportional to the square of mercury ions concentration. The UiO-66-DMTD adsorbent was easy to be regenerated and the removal rate decreased by only 13.5% after ten consecutive cycles. The results of FTIR, XRD and XPS suggested that the adsorption mechanism lay on the complexation reaction between Hg(II) and thiol/nitrogen-containing groups. Moreover, compared with other competitive metal ions, viz., Zn(II), Co(IV), Ni(II), Cd(II), Mg(II), Fe(III), Ca(II) and Cu(II), the UiO-66-DMTD demonstrated an outstanding selective adsorption for Hg(II). These results manifested that the UiO-66-DMTD was a latent adsorbent for the efficient and selective removal of Hg(II) in wastewater.
Ling Zhang,Jinghua Zhang,Xinglin Li,Cuijie Wang,Ajuan Yu,Shusheng Zhang,Gangfeng Ouyang,Yuanyuan Cui
Herein, a porous core-shell copper hydroxy sulfate@metal-organic framework decorated by 2,5-dimercapto-1,3,4-thiadiazol (DMTZ) was synthesized via a facile self-template strategy for the capture of Hg 2+ . The strategy of assembling MOF shell on copper hydroxy sulfate (CHS) core avoided the self-nucleation of MOF(Cu 3 (BTC) 2 ) in the solution and complex multistep procedures by means of in situ transformation the metal source CHS into well-defined Cu 3 (BTC) 2 crystal. The structure and properties of the DMTZ modified CHS@Cu 3 (BTC) 2 (CHS@Cu 3 (BTC) 2 -DMTZ) was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR), thermogravimetric analysis (TGA) and N 2 sorption–desorption isotherms (BET). The adsorption behavior followed Langmuir adsorption model and the maximum adsorption capacities for the removal of Hg 2+ was up to 627.6 mg g −1 . 99.96% Hg 2+ was rapidly captured by CHS@Cu 3 (BTC) 2 -DMTZ within 10 min from 40 mg L -1 to 0.014 mg L -1 . Meanwhile, not only X-ray photoelectron spectroscopy (XPS) but also Raman spectra verified the selective and strong interaction between Hg 2+ and thiol/nitrogen-containing functional groups of DMTZ on CHS@Cu 3 (BTC) 2 -DMTZ. These results manifested that this novel thiol-functionalized MOF adsorbent had superior adsorption capacity and selective for Hg 2+ .
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