| 多孔钛板负载Pd-Cu阴极电催化还原饮用水中硝酸盐的研究 |
| 摘要点击 2654 全文点击 1450 投稿时间：2005-04-06 修订日期：2005-05-31 |
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| 中文关键词 多孔钛 钯铜合金 电催化脱硝 饮用水 |
| 英文关键词 porous titanium Pd-Cu alloy electrocatalytic denitrification drinking water |
| DOI 10.13227/j.hjkx.20060616 |
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| 中文摘要 |
| 研究了以多孔钛板负载钯-铜(4∶1)合金作为阴极,通过电催化还原脱除饮用水中硝酸盐氮的效果和主要影响因素.试验表明,电催化反硝化的主要产物为氮气,钯-铜合金的电催化活性可达到16.69 mg/(g·h)、选择性可达96.9%.在低硝酸盐氮浓度下,电催化反硝化反应符合表观一级反应动力学,高浓度时符合零级反应动力学.当槽压低于1.5V或电流强度小于5mA时,阴极几乎不会发生硝酸盐氮的还原反应;而当槽压大于4.2V时或电流强度大于30mA时,阴极生成氨氮的副反应显著增加.中性条件下电催化反硝化的活性和选择性都能达到较好的效果,酸性条件下反应活性增加但选择性降低.溶液中的传质对反硝化没有显著影响.溶液中存在的其它阴离子对反硝化不利,不同阴离子对反硝化反应的影响次序为ClO4-3--. |
| 英文摘要 |
| We investigated performances as well as influencing factors of electrocatalytic denitrification of a porous titanium loaded Pd-Cu(4∶1) cathode,from drinking water.Up to 96.9% of NO3--N may be reduced to N2 with electrocatalytic activity as 16.69 mg/(g·h).The Nitrate reduction presented an apparent first order reaction at lower nitrate concentration,while a zero order reaction at higher nitrate concentration.Little nitrate reduction was observed when cell voltage(or current) was lower than 1.5 V(or 5 mA);the side reaction of ammonium production became noticeable if the cell voltage(or current) was higher than 4.2 V(or 30 mA).Both the activity and the selectivity were good at a neutral pH;at acidic pH,the activity increased while the selectivity decreased.Mass transfer in solution was found little effect on the reactions in the tests.Other anions such as ClO4-,HCO3-,Cl-did somewhat harms to NO3--N removal with sequence of ClO4- |
