Preparation of LDH/Bentonite Composite Particle Electrode by Co-Precipitation Method
To develop a particle electrode with efficient ability for removal of nitrate-nitrogen from water,the supported LDH/bentonite composite particle electrode was prepared by co-precipitation method using metal salts and bentonite as raw materials.The effects of metal type,copper to iron molar ratio,amount of bentonite,pH and temperature on the catalytic activity of the particle electrode were investigated.The results showed that the LDH/bentonite particle electrode synthesized by copper and iron salts had high catalytic activity.When the molar ratio of copper to iron was 3∶1,the amount of bentonite in 200 mL water was 1 g,the pH was 10,and the temperature was 40℃,the composite particle electrode had the best catalytic activity.At room temperature,a reduction test was conducted in 300 mL 100 mg/L KNO3 solution,the nitrate-nitrogen was completely removed,and N2 selectivity was 81.37%.The characterization results showed that LDH/bentonite composite particle electrode had a clear layered structure and good electrochemical performance.When the composite particle electrode was reused for the third time,the removal rate of nitrate-nitrogen was still as high as 90.27%,which had a good stability.
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