Reductive degradation of 2,2′,4,4′-tretrabromodiphenyl ether with PAC-Pd/Fe nanoparticles: Effects of Pd loading, initial pH and HA, and degradation pathway
| Autor: | Jianhua Cheng, Yongyou Hu, Sihao Lv, Guofu Huang, Mianmian Wang, Kui Yang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Hydrogen
Chemistry Environmental remediation General Chemical Engineering Inorganic chemistry Nanoparticle chemistry.chemical_element Ether 02 engineering and technology General Chemistry 010501 environmental sciences 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering chemistry.chemical_compound Electron transfer Polybrominated diphenyl ethers Environmental Chemistry Degradation (geology) Cellulose 0210 nano-technology 0105 earth and related environmental sciences |
| Zdroj: | Chemical Engineering Journal. 334:1252-1259 |
| ISSN: | 1385-8947 |
| DOI: | 10.1016/j.cej.2017.11.077 |
| Popis: | As a typical congener of Polybrominated diphenyl ethers (PBDEs), 2,2′,4,4′-tetrabromodiphenyl ether (BDE47) has attracted more and more attention due to its high biological toxicity and environmental abundance. In this study, a novel polyanionic cellulose stabilized Pd/Fe (PAC-Pd/Fe) nanoparticle was successfully synthesized for BDE47 degradation under ambient condition. Batch experiments showed that BDE47 degradation followed pseudo first-order kinetic model. Pd loading played a crucial role as it affected the formation of activated hydrogen species H∗ and accelerated electron transfer. At Pd loading of 0.3 wt%, nearly 100% BDE47 was degraded completely within 10 min by 0.4 g L−1PAC-Pd/Fe nanoparticles. When compared with strong acidic (pH 3) and alkaline (pH 9 and 11) conditions, weak acidic condition (pH 5) was more favorable for BDE47 degradation, with nearly 100% BDE47 was removed within 7.5 min. In the presence of HA inhibited the degradation of BDE47, and the degradation efficiencies within 15 min decreased from 100%, 88.6%, 79.5% to 73.1% as HA concentration increased from 0, 10, 40 to 70 mg L−1. The degradation of BDE47 by PAC-Pd/Fe nanoparticles was a reductive debromination process, and a stepwise debromination from n-Br to (n-1)-Br BDEs was the dominant reaction, in which the para-Br was more susceptible to remove than ortho-Br. This study suggests PAC-Pd/Fe nanoparticle can be utilized as a promising remediation technology for PBDEs contaminated wastewater. |
| Databáze: | OpenAIRE |
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