Air-breathing bio-cathodes based on electro-active biochar from pyrolysis of Giant Cane stalks |
| |
| Affiliation: | 1. e-Bio Center, Department of Environmental Science and Policy, Università Degli Studi di Milano, Via Celoria 2, 20133, Milano, Italy;2. Department of Management, Information and Production Engineering, University of Bergamo, Viale Marconi 5, 24044, Dalmine (BG), Italy;3. Sezione Materiali per Applicazioni Meccaniche, Dipartimento di Meccanica, Politecnico di Milano, Via La Masa 1, 20156, Milano, Italy;4. Department of Food Environmental and Nutritional Sciences, Università Degli Studi di Milano, Via Mangiagalli 25, 20133, Milano, Italy;5. RSE, Ricerca Sul Sistema Energetico S.p.A., Via Rubattino 54, 20100, Milano, Italy;1. Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NWS 2007, Australia;2. NTT Institute of Hi-Technology, Nguyen Tat Thanh University, Ho Chi Minh City, Viet Nam;3. Department of Environmental Energy Engineering, Kyonggi University, 442-760, Republic of Korea;4. Institution of Research and Development, Duy Tan University, Da Nang, Viet Nam;5. State Key Laboratory of Separation Membrane and Membrane Processes, National Center for International Joint Research on Membrane Science and Technology, School of Materials Science and Engineering, Tiangong University, Tianjin 300387, PR China;6. Vietnam Japan University (VNU-VJU), Vietnam National University, Hanoi, Luu Huu Phuoc St., Nam Tu Liem Dist., Hanoi 101000, Viet Nam;7. Faculty of Environmental Sciences, VNU University of Science, Vietnam National University, Hanoi, Viet Nam;1. Department of Chemistry and Chemical Engineering, Jiangxi Normal University, 99th Ziyang Road, 330022 Nanchang, China;2. Institute of Urban Environment, Chinese Academy of Sciences, 1799 Jimei Road, 361021 Xiamen, China;1. School of Environment and Energy, South China University of Technology, Guangzhou 510006, People''s Republic of China;2. Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, People''s Republic of China;3. School of Materials Science & Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0245, USA;4. Guangdong Provincial Engineering and Technology Research Centre for Environmental Risk Prevention and Emergency, Guangzhou 510006, People''s Republic of China;1. Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China;2. Shandong Special Equipment Inspection Institute Co, Ltd, Jinan 250101, China;1. INFIQC, Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba, Argentina;2. Planta Piloto de Ingeniería Química, PLAPIQUI (UNS-CONICET), Bahía Blanca, Argentina;3. Instituto de Ingeniería Electroquímica y Corrosión (INIEC) and CONICET, Universidad Nacional del Sur, Av. Alem 1253 - (B8000CPB) Bahía Blanca, Argentina |
| |
| Abstract: | An innovative low-tech solution to fabricate electro-active biochar (e-biochar) electrodes for bio-electrochemical systems (BES) is proposed. Ligno-cellulosic stalks of Giant Cane (Arundo Donax L.) were subjected to pyrolysis treatment at 900 °C for 1 h. The material kept its original hollow cylindrical shape, rigid morphology and porous texture, as confirmed by 3DX-ray micro-computed tomography. These characteristics are suitable for its use at the air-water interface in BES, as air-breathing bio-cathodes. BET (Brunauer-Emmett-Teller) specific surface area was equal to 114 ± 4 m2 g?1, with more than 95% of pores in the microporosity range (pore diameter < 1 nm). Surface electrocatalytic activity was sufficient to sustain oxygen reduction reaction at pH 7, in terms of both onset potential (?0.02 V vs Ag/AgCl) and reduction limiting current density (1 A m?2). Electrical resistivity measurements confirmed sufficient conductivity (8.9 × 10?3 ± 1 × 10?4 Ω m) of the material and Raman spectroscopy allowed to estimate a graphitization degree in relation to the ID/IG, equal to 2.26. In parallel, the e-biochar were tested as air-exposed bio-cathodes in BES, coupled to carbon cloth bio-anodes. After inoculation with wastewater from swine-farming, current densities were generated in the range of 100–150 mA m?2, along more than 2 months of operation, under sodium acetate feeding. Confocal laser scanning imaging revealed consistent biofilm formation on the water-side surface of the cathodes, while a nearly-complete absence of it at the air-side.These e-biochar electrodes might open innovative perspectives to scale-up BES for different applications. Here, consistent salts depositions on the material after 70 days of exposure to the wastewater, suggest that e-biochar biocathodes might serve to recycle nutrients to agricultural soils, through minerals-enriched biochar. |
| |
| Keywords: | Electroactive biochar Bio-electrochemical systems Air-cathode Wastewater treatment Pyrolysis |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
