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High-performance Ti/BDD electrodes for pollutant oxidation.

Xueming Chen¹, Guohua Chen, Furong Gao

¹Department of Chemical Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.

Environmental Science & Technology

|November 19, 2003

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Adding an organic additive, dimethoxymethane, to boron-doped diamond (BDD) film deposition on titanium (Ti) substrates significantly enhances electrode stability and longevity for wastewater treatment applications.

Area of Science:

Materials Science
Electrochemistry
Environmental Engineering

Background:

Depositing stable boron-doped diamond (BDD) films on titanium (Ti) substrates presents significant challenges.
Existing Ti/BDD electrodes have limited service lives, hindering industrial application.

Purpose of the Study:

To improve the stability and service life of Ti/BDD electrodes.
To evaluate the performance of enhanced Ti/BDD electrodes in oxidizing organic pollutants.

Main Methods:

Utilized an organic additive, dimethoxymethane (CH2(OCH3)2), during the deposition of BDD films on Ti substrates.
Conducted accelerated life testing to assess electrode durability.
Employed Raman spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM) for film characterization.

Related Experiment Videos

Measured current efficiency (CE) for the oxidation of various organic compounds.

Main Results:

Electrodes prepared with the additive exhibited service lives 2.3-3.0 times longer than conventional electrodes (175-264 h).
Characterization confirmed well-defined diamond features in the deposited films.
Achieved high current efficiencies (46.9-78.5%) for oxidizing acetic acid, maleic acid, phenol, and dyes, outperforming standard Ti/Sb2O5-SnO2 electrodes.
An electrode used for over 300 h maintained superior activity.

Conclusions:

The addition of dimethoxymethane significantly enhances the stability and extends the service life of Ti/BDD electrodes.
These stable and active electrodes demonstrate high efficiency in pollutant oxidation, paving the way for industrial applications in wastewater treatment via anodic oxidation.