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High N-selectivity of nitrite reduction by palladium-laden nanocomposite with self-sufficient electron donators. | LitMetric

High N-selectivity of nitrite reduction by palladium-laden nanocomposite with self-sufficient electron donators.

Sci Total Environ

College of Environment, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China. Electronic address:

Published: November 2024

AI Article Synopsis

  • The study presents a method for effectively reducing nitrite in wastewater to nitrogen gas using a recyclable Pd-based nanocomposite (Pd@EDA-CMPS) embedded in a porous carrier, enhanced by ethylenediamine (EDA).
  • Pd@EDA-CMPS demonstrated significant performance with an 86% nitrogen selectivity and maintained effectiveness across a broad pH range (4-11), outperforming other tested materials.
  • The research indicates that the EDA groups are crucial for creating reactive H-loaded Pd(0) nanoparticles, leading to successful nitrite reduction without needing external hydrogen sources, while also ensuring the nanocomposite can be regenerated for continued use.

Article Abstract

Selectively reducing nitrite to gaseous nitrogen (N) with an effective and recyclable fashion stands as an attractive alternative for treating the relevant wastewater. Herein, a Pd-based nanocomposite (Pd@EDA-CMPS) was subtly assembled by encapsulating Pd(0) nanoparticles into a porous polystyrene carrier, which was aforehand functionalized with ethylenediamine (EDA) as the endogenous electron donator. Systematical macroscopic experiments confirm that the pre-grafted EDA groups can substantially stimulate the catalytic activity of the laden Pd(0) nanoparticles with high removal efficiency and N selectivity of Pd@EDA-CMPS toward nitrite; specifically, high N selectivity (86%) was achieved by Pd@EDA-CMPS with an excellent anti-interference ability against competing anion and a broad pH-range applicability (4-11), whereas no N production was detected for its counterparts (CMPS, EDA-CMPS, and Pd@CMPS). Spectroscopic analyses reveal that the grafted EDA groups played a decisive role in the formation of H-loaded Pd(0) nanoparticles inside the porous substrate, which joint with the unique pH-buffering ability of EDA drove the reaction to the production of nitrogen (N) rather than ammonia (NH). The exhausted Pd@EDA-CMPS can be promisingly regenerated by NaOH (eluting) and NaBH (restoring) solution without obvious loss in treatment capacity and N selectivity. This work provides a feasible strategy for catalytically reducing nitrite into N without the provision of exogenous reductor such as hydrogen.

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Source
http://dx.doi.org/10.1016/j.scitotenv.2024.176126DOI Listing

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