Application of energy sustainable utilization strategy for highly efficient electro-Fenton treatment of antibiotics. Issue 1 (February 2022)

• Record Type: Journal Article
• Authors: Xing, Luyi; Wei, Jia; Liu, Xiaohui; Zhang, Yifei; Xu, Mengdie; Li, Jiamei; Pan, Guoping; Li, Jun
• Is Part Of: Journal of environmental chemical engineering. Volume 10:Issue 1(2022)
• Publication Date: 2022-02
• Subjects: Sewage sludge -- Biochar -- Nitrogen-doped -- Electro-Fenton -- Sulfonamide antibiotics; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.107059
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: An innovative nitrogen-doped sludge-derived biochar (NSBC) electro-Fenton cathode was fabricated by a hydrothermal and pyrolysis combination method, which was applied to the degradation of sulfamethoxazole (SMX). The superficial characteristics of the optimal cathode (NSBC*@Ni-F) showed a large number of oxygen reduction reaction (ORR) electrocatalytic active sites under acidic conditions with high electrons transfer efficiency. The two nitrogen species (pyridinic-N and graphite-N) dominated the ORR electrocatalytic active sites. The H2 O2 yield (195.99 mg L −1 ) and corresponding current efficiency (73.69 ± 1.2%) using NSBC*@Ni-F cathode were 7 times higher than that of bare sludge biochar as cathode in EF system. An excellent SMX removal efficiency (95.72%) was achieved as well. The TOC removal achieved 85.11% and corresponding energy consumption reached as low as 12.03 kW h kg −1 . Rational reaction intermediates were put forward during EF procedure to predict and explore the SMX degradation pathway for water remediation. This study is hopeful to hew out a new road to develop eco-friendliness and cost-effective cathode material in EF system with adequate activity and reuse stabilization. Graphical Abstract: ga1 Highlights: Sludge biochar contributed to high electron transfer efficiency in electro-Fenton. Oxygen reduction reaction active sites was governed by pyridinic N and graphite N. The optimal NSBC*@Ni-F cathode generated 195.99 mg·L −1 H2 O2 in 50 min 95.7% sulfamethoxazole was degraded with NSBC*@Ni-F cathode. After 6th cycle of NSBC*@Ni-F, the SMX degradation rate was still above 91.32%.