4.6 Article

Sludge biochar-based catalysts for improved pollutant degradation by activating peroxymonosulfate

Journal

JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 19, Pages 8978-8985

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta02282h

Keywords

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Funding

  1. National Natural Science Foundation of China [51538011]
  2. Program for Changjiang Scholars and Innovative Research Team in University
  3. Collaborative Innovation Center of Suzhou Nano Science and Technology of the Ministry of Education of China
  4. Anhui ST Key Project [1501041118]

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The persulfate-based advanced oxidation process is a promising technology for water treatment, while its effectiveness depends mainly on the activation efficiency of catalysts and the oxidant yield derived from persulfate. Thus, exploration of efficient and cost-effective activators for persulfate decomposition is highly desired. In this work, biochar, which was synthesized via a facile one-pot pyrolysis of sewage sludge, was proven to be an efficient persulfate activator for pollutant degradation. For a representative endocrine disrupting pollutant, bisphenol A, an average removal rate of 3.21 mol BPA per mol oxidant per h could be achieved by peroxymonosulfate in a wide pH range of 4.0-10.0 at a biochar dosage of 0.2 g L-1. Also, a high mineralization efficiency of similar to 80% (total organic carbon removal) was obtained within 30 min. A further catalytic mechanism study demonstrated that singlet oxygen, which was catalytically produced by the ketone structure inside the biochar, was the main reactive species responsible for bisphenol A degradation. More importantly, metals in the sludge precursor were found to play an important role in the active site formation during the pyrolysis of raw sludge. This work not only provides a novel value-added reuse approach for sewage sludge as an efficient persulfate activator but also would be beneficial for further designing and fabricating carbon-based persulfate catalysts.

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