Carbon-Based Catalyst Synthesized and Immobilized under Calcium Salt Assistance To Boost Singlet Oxygen Evolution for Pollutant Degradation

  • Bao-Cheng Huang
    Bao-Cheng Huang
    Department of Applied Chemistry, University of Science & Technology of China, Hefei 230026, Anhui, China
    Key Laboratory of Hangzhou City for Ecosystem Protection and Restoration, School of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 310036, Zhejiang, China
  • Gui-Xiang Huang
    Gui-Xiang Huang
    Department of Applied Chemistry, University of Science & Technology of China, Hefei 230026, Anhui, China
  • Jun Jiang
    Jun Jiang
    Department of Applied Chemistry, University of Science & Technology of China, Hefei 230026, Anhui, China
    More by Jun Jiang
  • Wu-Jun Liu
    Wu-Jun Liu
    Department of Applied Chemistry, University of Science & Technology of China, Hefei 230026, Anhui, China
    More by Wu-Jun Liu
  • , and 
  • Han-Qing Yu*
    Han-Qing Yu
    Department of Applied Chemistry, University of Science & Technology of China, Hefei 230026, Anhui, China
    *E-mail: [email protected]. Fax: +86-551-63601592.
    More by Han-Qing Yu
Cite this: ACS Appl. Mater. Interfaces 2019, 11, 46, 43180–43187
Publication Date (Web):October 29, 2019
Copyright © 2019 American Chemical Society
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Carbon-based materials are recognized as promising candidates for pollutant degradation because of their environmental benignity. Massive and cost-effective production and efficient recovery of carbon-based catalysts are crucial to apply this technology. However, various nanostructured carbons with different dimensions are usually utilized as precursors while not considering their complex preparation procedures and the high costs of ingredients. Moreover, catalyst separation and recovery are not given sufficient attention. In this work, a calcium salt-assisted pyrolysis strategy is proposed to tune the catalytic site formation of carbon-based catalysts. Results show that blending equal amounts of Ca2+ (calcium chloride) and organic precursors could greatly improve the catalytic activity of the carbonated product to activate peroxymonosulfate for pollutant degradation. In addition, the proposed synthetic strategy is universal to most of the readily accessed and cost-effective organic precursors. Singlet oxygen is identified as the main reactive oxidant for pollutant removal in the catalytic reaction. By cross-linking calcium ions and alginate as a hydrogel to immobilize the catalyst, the carbon material could be readily recovered. Furthermore, a long-term continuous-flow reactor test is conducted to validate the effectiveness of applying the immobilized catalyst to treat a synthetic wastewater with 0.5 mM bisphenol A. As a result, a green synthesis and immobilization strategy for persulfate catalysts is successfully established, and the prepared catalyst might be applied for wastewater treatment through using calcium salt in two purposes.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsami.9b15084.

  • Product yield in a typical pyrolysis process of CaCl2 and BSA mixture (Ca2+/BSA = 1.0/1), elemental compositions of catalysts prepared at different calcium dosages, C distributions in a product under different calcium chloride dosages, SEM images of catalysts, effectiveness of the calcium-assisted pyrolysis strategy for preparing a PMS activator with different organic precursors, effect of NaCl addition on improving BSAC’s catalytic activity, performances of alcohols on suppressing BPA degradation and ESR spectra by using DMPO as the trapping agent, contents of C atom with different structures within catalysts, and BPA degradation performance by using the catalyst prepared under CaCO3 assistance to activate PMS (PDF)

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