Qiu Xianying, Shen Yueyue, Yang Ruilin, Zhang Hongcheng, Zhao Shilin
a Chemistry and Materials Science College , Sichuan Normal University , Chengdu , People's Republic of China.
b Key Laboratory of Land Resources Evaluation and Monitoring in Southwest, Ministry of Education , Sichuan Normal University , Chengdu , People's Republic of China.
Environ Technol. 2019 Jan;40(2):202-209. doi: 10.1080/09593330.2017.1384072. Epub 2017 Oct 6.
Bayberry tannin immobilized on chitosan (CS-BT) was successfully prepared, and its adsorption performance was studied for aqueous solutions of rare earth ions. The as-prepared absorbents were characterized by Fourier transform infrared spectrometry and scanning electron microscopy. The equilibrium adsorption capacity was achieved in approximately 30 min. The adsorption process of CS-BT for Nd was well fitted with a Freundlich model and the kinetics followed the pseudo-second-order rate equation. The maximum adsorption capacity for Nd was 133.72 mg/g and dynamic adsorption characteristics of single ion (La, Ce, Nd) were investigated. The solution concentration was less than 30 mg/L when effluent volume was approximately 800 mL. Subsequently, the adsorbent column was desorbed by HNO solution. There was no significant loss of adsorption capacity after three cycles of regeneration, showing a satisfactory recyclability. Furthermore, CS-BT exhibited excellent dynamic adsorption performance of two mixed ions (La/Ce, La/Nd, Ce/Nd) and three mixed ions (La/Ce/Nd). The competitive adsorption capacity was La < Ce < Nd. The results indicate that the adsorption selectivity of column adsorption could provide a theoretical basis for the adsorption and separation of light rare earth ions. Therefore, this efficient adsorbent shows promising potential for the treatment of industrial wastewater.
