Abstract
In situ degradation of organic contaminants by Pd and electro-generated H2 and O2 overcomes the drawbacks to traditional Fenton process, and conducting heterogeneous catalyst of FeMgAl layered double hydrotalcite (LDH) further improved the efficiency and stability. Using bisphenol A (BPA) as the model contaminants, 90% removal can be achieved with 1200 mg/L Pd/Al2O3 and FeMgAl-2. The reusability was satisfying due to the very limited leaching of Fe ions at 0.1 ppm level. FeMgAl also amplified the window of pH for Pd-catalyzed in situ advanced oxidation processes (AOPs) from 3 by homogenous Fe(II) to 3–7 by FeMgAl LDH. The COD of landfill leachate effluent of the MBR system removed by about 52.3% by this system by the initial pH was 5. Characterizations revealed the distinguishing features associated with LDH structure such as large surface area, good stability, basic character, and strong linage among active sites were accounted for the remarkable performances over a wide pH window. Five reactive intermediates were observed and multiple degradation pathways were proposed in Pd-catalyzed in situ AOP for the first time. Interestingly, because of the unique role of Pd catalyst, these degradation pathways were clearly distinguished from traditional Fenton or Fenton-like AOPs and may provide a new approach of in situ heterogeneous AOPs for refractory contaminants in future.
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Acknowledgments
The authors also thank the Analytical and Testing Center of Huazhong University of Science and Technology for help in XRD, FTIR, SEM, LC/MS/MS and XPS analysis.
Funding
This project was funded by Chutian Scholar Foundation from Hubei province, Shenzhen Science and Technology Development Funds (No. JCYJ20160429182628979), and National Natural Science Foundation of China (No 21671072).
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Responsible editor: Vítor Pais Vilar
Highlights
• Heterogeneous Fe/Pd-catalyzed in situ AOP overcomes the shortage of traditional Fenton.
• Prepared FeMgAl LDH showed much better performances in both efficiency and stability.
• Degradation pathways including both oxidation and hydrogenation.
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Liao, Z., Dai, S., Long, S. et al. Pd based in situ AOPs with heterogeneous catalyst of FeMgAl layered double hydrotalcite for the degradation of bisphenol A and landfill leachate through multiple pathways. Environ Sci Pollut Res 25, 35623–35636 (2018). https://doi.org/10.1007/s11356-018-3454-4
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DOI: https://doi.org/10.1007/s11356-018-3454-4