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电化学脱硝过程参数的响应曲面优化研究

Keywords: 电化学脱硝,Ti/IrO2-TiO2-RuO2阳极,优化,Box-Behnken,design

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Abstract:

以Ti/IrO2-TiO2-RuO2为阳极,Cu/Zn合金电极为阴极,在无隔膜电解池中对这一新构造电极对的脱硝氮性能进行了研究。为了有效结合阴极硝氮还原能力和阳极氧化能力,采用响应曲面法中的Box-Behnken设计优化了对电化学脱硝过程有显著影响的4个重要因素:氯化钠含量、电流密度、pH和初始硝氮浓度。优化结果表明,相对于pH和初始硝氮浓度,氯化钠含量和电流密度对脱硝性能影响更大,而阴极硝氮还原性能主要受初始硝氮浓度、pH的影响。以6h内电极对脱氮百分率为响应量,优化得最佳电化学脱硝过程参数为:氯化钠含量,1g/L;电流密度,24.99mA/cm2;pH,1.81;初始硝氮浓度100mg/L。在此实验条件下,6h内电极对脱氮百分率预测值为99.84%。通过3次重复验证实验,确认实际6h内电极对脱氮百分率为91.34%。预测值与实测值两者相差不大,由此可知,Box-Behnken设计是一种优化电化学脱氮实验参数的有效方法,经过优化后的电极对具有较佳的脱氮效率。

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