4.3 Article

Improvement of dyes degradation using hydrofluoric acid modified biochar as persulfate activator

Journal

ENVIRONMENTAL POLLUTANTS AND BIOAVAILABILITY
Volume 31, Issue 1, Pages 32-37

Publisher

TAYLOR & FRANCIS LTD
DOI: 10.1080/26395940.2019.1578185

Keywords

Biochar; persulfate; azo dye; acid orange 7; degradation

Funding

  1. National Natural Science Foundation of China [21607002, 41705107]
  2. Anhui Provincial Natural Science Foundation [1708085QD85, 1808085QD110, 1808085MB49]
  3. Anhui Science and Technology Project [1704e1002238]

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The hydrofluoric acid modified biochar (HF-BC) was obtained, aiming to improve its performance for activating persulfate (PS) to make acid orange 7 (AO7) degraded in water solution. Results showed that the surface area, micropore volume, carboxyl and phenolic hydroxyl group content of HF-BC increased by 171%, 172%, 23.8% and 50%, respectively, compared to unmodified biochar (BC). The decolorization of AO7 in HF-BC/PS and BC/PS system was much more rapid and efficient than that in HF-BC, BC and PS alone system. For the HF-BC/PS system, the AO7 was removal of 99.8%, much higher than that of BC/PS system, probably because of its better surface characteristics. Moreover, for the HF-BC/PS system, it was the higher PS concentration and HF-BC dosage that caused greater AO7 degradation rates, and lower pH was favorable for the degradation. Our results provided a novel method to design biochar as an activator for persulfate-based remediation of dye wastewater.

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