He huaxue yu fangshe huaxue (Jun 2022)
Adsorption Behavior of Sr2+ on Solid Phase Adsorption Material DMDODGA/P120
Abstract
The work has immobilized N,N′-dimethyl-N,N′-dioctyldiglcolamide(DMDODGA) on the porous adsorption resin P120 by using vacuum immobilization and infusion technology to synthesize a new supramolecular recognition material DMDODGA/P120. Then, scanning electron microscopy(SEM), Fourier transform infrared spectroscopy(FTIR), elemental analysis(C, H, N, O) were used to characterize the material. The results show that most of DMDODGA are successfully loaded into the pores of P120, and the load is about 53.1 g DMDODGA per 100 g P120. The structure of the carrier(P120) was not destroyed. Through static adsorption experiments, the effects of contaction time, initial concentration of Sr2+, the concentration of HNO3, solid-to-liquid ratio between adsorbent material and liquid and temperature on the adsorption performance of DMDODGA/P120 have been studied. And its kinetic curve and adsorption isotherm have been analyzed. Besides, the desorption process and radiation stability of DMDODGA/P120 have been studied. And the penetration curve of DMDODGA/P120 has been studied through dynamic adsorption experiments. The results show that the adsorption equilibrium time of DMDODGA/P120 is about 10 min, and the adsorption process conforms to the quasi-second-order kinetic equation, indicating that the process is chemical adsorption. The adsorption process of Sr2+ is a single-layer chemical adsorption that occurs on the surface of the adsorbent. The adsorption performance of DMDODGA/P120 increases first and then decreases with the increase of acidity. The adsorption process is exothermic. The solid-to-liquid ratio between the adsorbent material and the liquid during the adsorption process can be controlled at about 20 g/L. DMDODGA/P120 has a good radiation resistance. It won’t be a greater degree of radiolysis until the radiation dose reaches 106 Gy. The dynamic adsorption result of DMDODGA/P120 shows that the exchange column is broken down in 5-6 column volumes, and the total removal rate of Sr2+ is about 52.53%.
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