Bipyridine covalent organic framework aerogel for highly selective recovery of palladium in wastewater
Yang Liu, Weikang Guo, Jiale Liu, Haijuan Tao, Juan Yang, Qin Shuai, Yusuke Yamauchi, Brian Yuliarto, Yusuke Asakura, Lijin Huang
Abstract
at pH 1. Additionally, even in the presence of other coexisting ions at concentrations 100 times higher than Pd(ii), the adsorption efficiency for Pd(ii) remains above 99%. Mechanistic investigations indicate that the adsorption of Pd(ii) by the TpBpy/CS aerogels primarily occurs through the coordination between pyridine N and Pd(ii), as well as the electrostatic interaction between protonated amino groups and Pd(ii). Moreover, the TpBpy/CS aerogel demonstrates exceptional reusability, maintaining an adsorption efficiency for Pd(ii) above 99% after nine adsorption-desorption cycles. Overall, the TpBpy/CS aerogel is a promising monolithic adsorbent for the efficient recovery of Pd(ii) from acidic industrial wastewater due to its exceptional adsorption capacity and selectivity, demonstrating substantial potential for practical applications.