采用C／PTFE气体扩散电极在无隔膜体系中进行H2 O2发生工艺研究，探讨了石墨和Vulcan XC?72碳黑两种碳材料以及电解电压、pH值对该反应过程的影响．结果表明，在较低的空气流量（1．41 cm3·min－1·cm－2）下，以Vulcan XC?72碳黑为表面的气体扩散电极相比石墨电极有较高的H2 O2产率和电流效率，碱性条件比酸性条件下H2O2产率和电流效率更好；在2．6 V恒定电压下，2 h后，H2 O2浓度达到了250 mg·L－1，电流效率从69?8％降到44．7％，单位产量能耗从5．87 kWh·kg－1升高到9．16 kWh·kg－1．
This study focused on the preparation of C/PTFE gas diffusion electrode and their use for generating hydrogen peroxide in an undivided system. The technique character is that the process could maintain high hydrogen peroxide generation rate, high current efficiency and reasonable energy consumption on the lower aeration rate. The experimental results demonstrated that factors including the carbon species ( graphite or Vulcan XC?72) , voltage and pH showed apparent influences on the hydrogen peroxide generation. The gas diffusion electrode made of Vulcan XC?72 showed higher hydrogen peroxide generation rate and current efficiency than the GDE made of graphite. And it was also observed that the alkaline pH was beneficial to the hydrogen peroxide generation. The hydrogen peroxide concentration reached 250 mg·L-1 after 2 h, and current efficiency declined from 69.8% to 44.7%, while energy consumption increased from 5. 87 kWh·kg-1 to 9. 16 kWh·kg-1 , when the aeration rate was 1.41 cm3·min-1·cm-2 , and the voltage was 2.6 V.
参考文献
| [1] | Konstantinos V. Plakas;Anastasios J. Karabelas;Stella D. Sklari .Toward the Development of a Novel Electro-Fenton System for Eliminating Toxic Organic Substances from Water. Part 1. In Situ Generation of Hydrogen Peroxide[J].Industrial & Engineering Chemistry Research,2013(39):13948-13956. |
| [2] | Rafael M. Reis;Andre A. G. F. Beati;Robson S. Rocha .Use of Gas Diffusion Electrode for the In Situ Generation of Hydrogen Peroxide in an Electrochemical Flow-By Reactor[J].Industrial & Engineering Chemistry Research,2012(2):649-654. |
| [3] | Brillas, E;Sires, I;Oturan, MA .Electro-Fenton Process and Related Electrochemical Technologies Based on Fenton's Reaction Chemistry[J].Chemical Reviews,2009(12):6570-6631. |
| [4] | M.H.M.T. Assumpcao;A. Moraes;R.F.B. De Souza.Low content cerium oxide nanoparticles on carbon for hydrogen peroxide electrosynthesis[J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,2012:1-6. |
| [5] | Barros W R P;Reis R M;Rocha R S et al.Electrogeneration of hydrogen peroxide in acidic medium using gas diffusion electrodes modified with cobalt (Ⅱ) phthalocyanine[J].Electrochimica Acta,2013,104:12-18. |
| [6] | Ricardo B. Valim;Rafael M. Reis;Pollyana S. Castro.Electrogeneration of hydrogen peroxide in gas diffusion electrodes modified with tert-butyl-anthraquinone on carbon black support[J].Carbon: An International Journal Sponsored by the American Carbon Society,2013:236-244. |
| [7] | Heng Dong;Hongbing Yu;Xin Wang .Catalysis Kinetics and Porous Analysis of Rolling Activated Carbon-PTFE Air-Cathode in Microbial Fuel Cells[J].Environmental Science & Technology: ES&T,2012(23):13009-13015. |
| [8] | 杨超 .气体扩散电极孔道结构设计与电化学性能关系研究[D].北京化工大学,2013. |
| [9] | 郁青红,周明华,雷乐成.新型气体扩散电极体系高效产H2O2的研究[J].物理化学学报,2006(07):883-887. |
| [10] | 徐文英,董滨,李平.气体扩散电极体系的电化学消毒[J].环境化学,2010(02):246-251. |
| [11] | X.S.Chai;Q.X.Hou;Q.Luo;J.Y.Zhu .Rapid determination of hydrogen peroxide in the wood pulp bleaching streams by a dual-wavelength spectroscopic method[J].Analytica chimica acta,2004(2):281-284. |
| [12] | Zhimin Qiang;Jih-Hising Chang;Chin-Pao Huang .Electrochemical generation of hydrogen peroxide from dissolved oxygen in acidic solutions[J].Water research: A journal of the international water association,2002(1):85-94. |
| [13] | Lei Zhou;Zhongxin Hu;Chao Zhang.Electrogeneration of hydrogen peroxide for electro-Fenton system by oxygen reduction using chemically modified graphite felt cathode[J].Separation and Purification Technology,2013:131-136. |
| [14] | F. Bidault;D. J. L. Brett;P. H. Middleton;N. P. Brandon .Review Of Gas Diffusion Cathodes For Alkaline Fuel Cells[J].Journal of Power Sources,2009(1):39-48. |
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