Application of TiO2/BDD composite electrode in electrochemical oxidation treatment of pharmaceutical wastewater
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摘要: 通过水热法在掺硼金刚石(boron-doped diamond,BDD)薄膜电极表面生长出二氧化钛纳米束,制备出具有光电协同催化功能的TiO2/BDD复合电极。通过电化学工作站表征该电极的电化学性能,并利用该电极对制药废水进行降解实验。研究结果表明:该复合电极具有宽的电化学势窗,酸性、中性和碱性条件下分别达到3 V、4 V和4 V,析氧过电位均达到2 V以上,同时背景电流低,可逆性良好。复合电极对药厂废水的降解具有显著的效果,可以在630 min的时间内,将实验水样的化学需氧量从7339 mg/L降低到19 mg/L,降解率为99.7%。Abstract: In this paper, nano TiO2 are grown on the surface of boron-doped diamond (BDD) film using a hydrothermal method, thus fabricating a TiO2/BDD composite electrode with photoelectric co-catalysis function. The electrochemical property of the electrode is characterized by a electrochemical workstation, and then the electrodes are used to degrade the pharmaceutical wastewater. Results show that the electrode has a wide electrochemical potential, which is 3 V, 4 V and 4 V in acidic, neutral and alkaline conditions, respectively. It also has an anodic oxidation potential of 2 V with low background current and good reversibility. The composite electrode has remarkable degrading effect on the wastewater by reducing the chemical oxygen demand from 7339 mg/L to 19 mg/L in 630 min, which means a 99.7% reduction.
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Key words:
- boron-doped diamond film /
- TiO2 /
- electrochemistry /
- photocatalytic /
- organic wastewater
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