甲酸存在下硝酸根在二氧化钛表面光催化还原成氨

PHOTOCATALYTIC REDUCTION OF NITRATE TO AMMONIA ON TITANIA IN THE PRESENCE OF FORMIC ACID

用甲 酸作空穴 清除剂， 研究了 Ｔｉ Ｏ２ 水悬浮 体系中 硝酸根光 催化还 原成氨的 反应． 与草酸作空穴 清除剂 相比，甲酸 加速硝 酸根的 还原 更 显著． 研 究 了硝 酸根 和 甲酸 根的 浓 度效 应 及ｐ Ｈ 效应． 实验结果 表明，硝 酸根在 Ｔｉ Ｏ２ 表面 的吸附是 加速该 光催化还 原反应的 重要因 素．

Using formic acid as a hole scavenger, photocatalytic reduction of nitrate to NH 3 has been investigated. Compared with oxalic acid, formic acid accelerates the reaction more considerably. The effects of concentration of nitrate and formate, and pH have been studied. It is showed that the adsorption of nitrate on TiO 2 is an important factor for accelerating the reaction.