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In-situ synthesis of UiO-66-NH2 on porous carbon nanofibers for high performance defluoridation by capacitive deionization

Highly fluoridated water threatens human health. This paper reports on the in-situ synthesis of UiO-66-NH2 on a porous carbon nanofibers (PCNF) surface by a solvothermal method and its application for the selective removal of F? by capacitive deionization (CDI). The obtained UiO-66-NH2 @PCNF was highly flexible, with UiO-66-NH2 uniformly and firmly attached to the fiber surface. As an anode, it exhibited exceptional adsorption performance, with a maximal F? adsorption capacity of 213?mg?g?1. This UiO-66-NH2 @PCNF electrode had high stability, and 88% of F? adsorption capacity was retained after 10 adsorption/regeneration cycles. In addition, this electrode held good F? selectivity, in the presence of Cl?, NO3?, SO42? and CO32?, attributed to pore size sieving effect of UiO-66-NH2 nanochannels and strong F-binding ability with the specific active sites in the UiO-66-NH2 nanochannels. In the simulated groundwater with high concentration of F?, the removal percentage is near 87%, and the residual content of F? was down to 0.64?mg?L?1 after CDI adsorption, which is far below the acceptable limit in drinking water standards of World Health Organization (WHO). The superior F? removal performance of the UiO-66-NH2 @PCNF self-supporting electrode bestowed the corresponding CDI device great promise for the purification of F?-contaminated water.

» Author: Yongsheng Hu, Bin Hu, Yuanxin Ge, Pengfei Nie, Jianmao Yang, Manhong Huang, Jianyun Liu

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