A green attapulgite bacterial cellulose imprinted aerogel for selective adsorption and recovery of Dy(III)

Abstract

Recycling dysprosium from the environment can not only alleviate the industrial crisis, but also reduce the ecological pollution caused by dysprosium ions. At present, the price of the materials used to adsorb rare earth ions is generally high, which is not conducive to the wide application of the adsorbents in the rare earth industry. In this paper, based on the 3D network structure of carboxylated bacterial cellulose, some cheap materials such as attapulgite and gelatin were used to replace the high-priced raw materials, and a low-cost and green I-APT-GT-OBC aerogel was prepared. To test the adsorption properties of the composite aerogel, we carried out a series of adsorption experiments. The results showed that the saturated adsorption capacity of dysprosium ions by the imprinted aerogel was 48.762 mg g − 1 when the pH value was 5.0, and the adsorption process was spontaneous, endothermic and entropy increasing. In the competitive adsorption experiment, the K d value of I-APT-GT-OBC for dysprosium ions was 4084.40 mL g − 1 , which was much higher than that of other aerogels, showing excellent selective adsorption. In conclusion, I-APT-GT-OBC is expected to be a low-cost adsorbent that can e ciently adsorb dysprosium ions in water.