State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, People's Republic of China.
State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, People's Republic of China.
J Environ Manage. 2021 Feb 15;280:111834. doi: 10.1016/j.jenvman.2020.111834. Epub 2020 Dec 23.
Palladium (Pd) is extremely expensive due to its scarcity and excellent catalytic performance. Thus, the recovery of Pd has become increasingly important. Herein, microbial extracellular polymeric substances (EPS) and magnetic nanocomposite EPS@FeO were applied to recover Pd catalysts from Pd(II) wastewater. Results indicated that Pd(II) was reduced to Pd (0), which was then adsorbed by EPS (101.21 mg/g) and EPS@FeO (126.30 mg/(g EPS)). After adsorbing Pd, EPS@FeO could be collected by magnetic separation. The recovered Pd showed excellent catalytic activity in the reduction of methylene blue (MB). The pseudo-second-order kinetic model and Redlich-Peterson model best fit the adsorption results. According to spectral analysis, Pd(II) was reduced to Pd (0) by chemical groups in EPS and EPS@FeO, and the hydroxyl had a chelating effect on adsorbed Pd. Therefore, EPS@FeO is an efficient adsorbent for recovering Pd from Pd(II) wastewater.
钯（Pd）由于其稀缺性和出色的催化性能而极其昂贵。因此，钯的回收变得越来越重要。本文采用微生物胞外聚合物（EPS）和磁性纳米复合材料 EPS@FeO 从 Pd(II)废水中回收 Pd 催化剂。结果表明，Pd(II)被还原为 Pd(0)，然后被 EPS（101.21 mg/g）和 EPS@FeO（126.30 mg/（g EPS））吸附。吸附 Pd 后，EPS@FeO 可通过磁分离收集。回收的 Pd 在还原亚甲基蓝（MB）中表现出优异的催化活性。准二级动力学模型和 Redlich-Peterson 模型最适合吸附结果。根据光谱分析，Pd(II)被 EPS 和 EPS@FeO 中的化学基团还原为 Pd(0)，而羟基对吸附的 Pd 具有螯合作用。因此，EPS@FeO 是从 Pd(II)废水中回收 Pd 的有效吸附剂。
