The adsorption of U(VI) by persimmon tannin modified aminated polyacrylonitrile fiber

Abstract

In this study, a green and efficient persimmon tannin functionalized polyacrylonitrile fiber (PAN-TETA-PT) was prepared and used to treat U(VI). The influence of pH value, adsorption temperature and time, and fiber material dosage on the adsorption U(VI) of PAN-TETA-PT fibers were investigated, and the kinetics, isotherm, and thermodynamics of fibers were analyzed. When the pH is 6, the temperature is 30°C, and the fiber dosage is 0.2 g·L−1, the adsorption rate of PAN-TETA-PT fibers to U(VI) was 96.5%, and the U(VI) adsorption capacity was 159.75 mg/g. The kinetic and isothermal studies show that the adsorption of PAN-TETA-PT fibers to U(VI) is chemisorbed and multilayer adsorption. The thermodynamic analysis reflects that the PAN-TETA-PT is spontaneously endothermic for the adsorbed U(VI).

Adsorption and desorption behavior of Zn2+ in a flow-through electrosorption reactor

“…Flow-through electrosorption exhibits a decrease in relative adsorption capacity at higher temperatures, which may be due to the difficulty of adsorption due to the increased irregular motion of Zn 2+ at higher temperatures and the possible exothermic adsorption reaction of Zn 2+ by electrosorption. 31 , 32 …”