AI Article Synopsis
- Palladium (Pd) is valuable due to its rarity and catalytic properties, making its recovery crucial from Pd(II) wastewater.
- Microbial extracellular polymeric substances (EPS) and their magnetic version (EPS@FeO) effectively reduce Pd(II) to Pd(0), where EPS@FeO has higher absorption rates and can be easily separated using magnets.
- The recovered Pd demonstrates strong catalytic activity, particularly in reducing methylene blue, with adsorption processes best described by the pseudo-second-order kinetic model and Redlich-Peterson model.
Article Abstract
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.
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| http://dx.doi.org/10.1016/j.jenvman.2020.111834 | DOI Listing |
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