A novel adsorbent was prepared from hydrolyzed granular leather waste (ZHGLW) impregnated with Zr(Ⅳ) for fluorion removal. Fluorion adsorption performance and mechanism were investigated by scan electron microscope
energy dispersive analysis of X-ray
X-ray photoelectron spectroscope
and Fourier transform infrared spectroscopy. The results indicate that the optimal mass ratio of hydrolyzed granular leather waste and Zr(NO3)4·5H2O is 1:3 in this study. The maximum removal of fluorion is obtained at pH 3. The isotherm data fit the Langmuir isotherm model well and the obtained maximum fluorion adsorption capacity of the sorbent is 30.56 mg·g-1. The kinetics of fluorion adsorption onto ZHGLW follows the pseudo-second-order model. Fluorion adsorption process is a chemisorption process
which can be described as that -OH is replaced by fluorion in the form of ion exchange and a stable chemical bond forms through fluorion and impregnated Zr(Ⅳ). Thus
ZHGLW could be an efficient adsorbent for fluorion.