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

Environmental Pollutants & Bioavailability

Yanyan Mei¹  Feiyue Li²  Yan Wang²  Yongbin Cai²  Yue Xie²  Xingjun Fan² 

[1] Anhui Province Key Laboratory of Biochar and Cropland Pollution Prevention, Anhui Laimujia Biotechnology Co., Ltd.;Anhui Science and Technology University;

关键词: biochar;    persulfate;    azo dye;    acid orange 7;    degradation;   

DOI  :  10.1080/26395940.2019.1578185

来源: DOAJ

【 摘 要 】

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 systemwas 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. Abbreviations: HF-BC, hydrofluoric acid modified biochar; BC, unmodified biochar; AO7, Acid orange 7; PS, persulfate

【 授权许可】

Unknown