Research
| Title： | Cobalt-Doped Hydrochar Derived from Microalgae as an Efficient Peroxymonosulfate Activator for Paraben Degradation |
|---|---|
| First author： | Hu, Chenyan; Wu, Suxin; Wang, Jiali; Chen, Lianguo |
| Journal： | CATALYSTS |
| Years： | 2024 |
| DOI： | 10.3390/catal14100695 |
| Abstract： | Hydrochar, an attractive member of the carbonaceous materials, is derived from biomass and projects great potential in peroxymonosulfate (PMS) activation, but has not been studied much. Herein, by using the large-scale cultured Chlorella vulgaris and field-collected bloom algae, a series of porous hydrochar was synthesized via a facile hydrothermal carbonization reaction, while Co doping significantly increased their specific surface areas, carbonization degree, and surface functional groups. These Co-doped hydrochar (xCo-HC, x: amount of the Co precursor) could efficiently activate the PMS, resulting in nearly 100% removal of five common paraben pollutants within 40 min. A dosage of 0.2Co-HC of 0.15 g/L, a PMS concentration of 0.6 g/L, and an unadjusted pH of 6.4 were verified more appropriately for paraben degradation. The coexistence of Cl-, SO42-, and humic acid inhibited the degradation, while HCO3- showed an enhancing effect. No observable change was found at the presence of NO3-. Quenching results illustrated that the produced center dot SO4- during the conversion of doped Co3+/Co2+ acted as the dominant active species for paraben degradation, while center dot O2-, 1O2, and center dot OH contributed relatively less. The algae-based hydrochar potentially facilitated the electron transfer in the xCo-HC/PMS system. Overall, this study develops a new strategy for resource utilization of the abundant algae. |
