CoAl-LDHs@Fe3O4 decorated with cobalt nanowires and cobalt nanoparticles for a heterogeneous electro-Fenton process to degrade 1-hydroxyethane-1, 1-diphosphonic acid and glyphosate. Issue 5 (20th January 2022)

• Record Type: Journal Article
• Authors: Zhou, Kexin; Liu, Xing-peng; Guo, Hongyun; Li, Hui-qiang; Yang, Ping
• Is Part Of: RSC advances. Volume 12:Issue 5(2022)
• Page Start: 2623
• Page End: 2631
• Publication Date: 2022-01-20
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d1ra08493c
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Cobalt nanowires and cobalt particles are introduced into CoAl-LDHs@Fe3 O4, and the effect of the former is better in the application of electro-Fenton process. Abstract : Heterogeneous electro-Fenton is one of the promising technologies to degrade refractory organic phosphonates. In this work, CoNWs@CoAl-LDHs/Fe3 O4 and CoNPs@CoAl-LDHs/Fe3 O4 were successfully synthesized by a co-precipitation method and applied to degrade 1-hydroxyethane-1, 1-diphosphonic acid (HEDP) and glyphosate (PMG) via an electro-Fenton process. The results indicated that the removal rate of HEDP (100 mg L −1 ) and PMG (100 mg L −1 ) by CoNWs@CoAl-LDHs/Fe3 O4 increased from 62.09% and 95.31% to 82.45% and 100%, respectively. The CoNPs@CoAl-LDHs/Fe3 O4 electro-Fenton system could remove 70.03% of HEDP and nearly 100% of PMG within 2 hours at a pH of 3. Moreover, we compared the SEM, EDS, XRD and BET results of CoNWs@CoAl-LDHs/Fe3 O4 with those of CoNPs@CoAl-LDHs/Fe3 O4 . The effects of initial pH, CoNW dosage and reaction time on the degradation of HEDP and PMG were discussed. CoNWs@CoAl-LDHs@Fe3 O4 could even remove 71.03% of HEDP at a neutral pH. After four cycles of repeated use at a pH of 3, the removal rate of HEDP by CoNWs@CoAl-LDHs/Fe3 O4 was still higher than 70%. Radical quenching experiments revealed that ˙OH is the dominant active species participating in the heterogeneous electro-Fenton process. Finally, we would talk about the mechanism of the CoNWs@CoAl-LDHs/Fe3 O4 -based electro-Fenton system.