(1. 東北大學 材料與冶金學院，沈陽 110004；
2. 河北省廊坊市規(guī)劃局，廊坊 065000)
摘 要: 利用高能球磨法制備了鈣鈦礦型硫酸鹽摻雜的含鈦高爐渣光催化劑，考察了初始pH值對Cr(Ⅵ)−檸檬酸−硝酸鐵(Cr(Ⅵ)-CA-FN)復合體系中Cr(Ⅵ)吸附效率和光催化還原效率的影響，并探討了Cr(Ⅵ)-CA-FN復合體系中Cr(Ⅵ)可能的光催化還原機理。結(jié)果表明：在Cr(Ⅵ)-CA-FN復合體系中，酸性條件下有利于Cr(Ⅵ)的光催化還原，最佳pH值為2.5；檸檬酸和Fe(Ⅲ)降低了吸附對Cr(Ⅵ)還原率的影響，有效地抑制電子−空穴對的復合，促進光生電子還原Cr(Ⅵ)離子；六價鉻濃度的降低一部分是光催化還原所致，另一部分是由于催化劑本身含有的二價錳離子還原所致。
關(guān)鍵字: 含鈦高爐渣；Cr(Ⅵ)−檸檬酸−硝酸鐵復合體系；光催化還原；六價鉻
Cr(Ⅵ) -citric acid-ferric nitrate compound system
（1. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China;
2. Bureau of Urban Planning of Langfang, Langfang 065000, China）
Abstract:Using calcined sulfate-modified titanium-bearing blast furnace slag as photocatalyst, the photocatalytic reduction of Cr(Ⅵ) in Cr(Ⅵ) -citric acid-ferric nitrate compound systems were studied. The effects of pH values on the photocatalytic reduction and adsorption of Cr(Ⅵ) were investigated. The results indicate that the acidic solutions are favorable for the photocatalytic reduction of Cr (Ⅵ) in Cr(Ⅵ)-citric acid-ferric nitrate (Cr(Ⅵ)-CA-FN) compound system, and the optimum pH value for the reduction of Cr (Ⅵ) is 2.5. The effect of adsorption on the photocatalytic reduction of Cr(Ⅵ) decreases. The recombination rate of electron-hole pairs decreases, and hence the reduction efficiency of Cr(Ⅵ) enhances. The decline of Cr(Ⅵ) concentration is caused by the compound effect between the reduction of Mn2+ and the photocatalytic reduction.
Key words: titanium-bearing blast furnace slag; Cr(Ⅵ)-citric acid-ferric nitrate(Cr(Ⅵ)-CA-FN) compound system; potocatalytic reduction; Cr(Ⅵ)
