铁及铁铜氧化物对臭氧氧化酸性红B的催化效能
Catalytic ozonation of Acid Red B in aqueous solution with Fe and Fe-Cu composite oxide
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摘要: 采用自蔓延溶胶凝胶法分别制备了铁氧化物和铁铜复合氧化物催化剂，以酸性红B为降解对象，对比了单独臭氧氧化、铁氧化物和铁铜复合氧化物催化臭氧氧化对酸性红B的降解效果，考察了磁力搅拌速度(500～1 640 r/min)、溶液pH (3～11)、臭氧投加速率(3.55～28.4 mg/min)对铁铜复合氧化物催化性能的影响。结果表明，与单独臭氧氧化比较，铁氧化物和铁铜复合氧化物均能加速酸性红B的降解，促进色度和COD的去除，结合催化剂的表征结果，推断催化剂表面羟基促进臭氧分解产生·OH是其氧化性能较好的主要原因，另外，催化剂的吸附能力对催化性能也有一定影响。随着磁力搅拌速度、溶液pH、臭氧投加速率的增大，铁铜复合氧化物催化臭氧氧化酸性红B的效果越好。Abstract: The iron oxides and Fe-Cu composite oxide catalysts were synthesized through a nitratecitrate combustion route. These catalysts were used in catalytic ozonation of Acid Red B， and their performance was compared with conventional ozonation. The effects of magnetic stirring speed (500～1 640 r/min)， solution pH (3～11) and ozone flow (3.55～28.4 mg/min) on color and COD removal were investigated in catalytic ozonation using Fe-Cu composite oxide as catalysts. The results indicated that the adding of iron oxides and Fe-Cu composite oxide catalysts into the ozonation reactor obviously accelerated the rate of Acid Red B degradation， thereby improved the reduction of color and COD compared to conventional ozonation. Combined with the results of catalysts characterization， it can be inferred that the hydroxyl groups on the catalysts’ surface accelerated the ozone decomposition， which resulted in the generation of hydroxyl radicals. This might be the main reason for the better oxidation with catalysts. In addition， catalyst’s adsorption capacity also had some impact on oxidation ability. In Fe-Cu composite oxide catalytic ozonation process， with the increase of magnetic stirring speed， solution pH， ozone flow， the removal rate of Acid Red B and COD increases.
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Key words:
- catalytic oxidation /
- nitrate-citrate combustion route /
- Fe-Cu composite oxide /
- ozonation /
- Acid Red B
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