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以铁为活性组分,钙基蒙脱石为载体,分别采用传统法、超声和微波辅助法制备了Fe-Zn-Al-柱撑蒙脱石(Fe-Zn-Al-Mt)系列催化剂。表征了催化剂的结构和表面性能,研究了不同Fe/Zn摩尔比、焙烧温度以及制备方法对催化剂性能的影响;并将该催化剂用于催化湿式过氧化氢氧化法(CWPO)降解酸性橙II(OII)染料废水。结果表明:采用Fe/Zn摩尔比为3/7、焙烧温度为500℃、微波辅助制备的Fe-Zn-Al-Mt催化剂在蒙脱石表面形成更多的活性组分(Zn Fe2O_4纳米粒子),用于CWPO降解OII染料废水时效果最佳,其中色度和化学需氧量(COD)去除率可分别高达99.9%和79.7%,Fe离子溶出量仅为0.27 mg/L。此外,微波辅助制备的Fe-Zn-Al(3/7)-Mt催化剂重复使用5次,均能使废水褪色,COD去除率仅降低了3.1%,总Fe离子溶出仅为0.42 mg/L。表明Fe-Zn-Al-Mt催化剂用于降解OII染料废水时具有较高的催化活性和稳定性。
Fe-Zn-Al-pillared montmorillonite (Fe-Zn-Al-Mt) catalysts were prepared by the traditional method, ultrasonic and microwave assisted method using iron as the active component and calcium-based montmorillonite as the carrier. The structure and surface properties of the catalyst were characterized. The effects of molar ratio of Fe / Zn, calcination temperature and the preparation method on the performance of the catalyst were studied. The catalyst was also used to catalyze the degradation of acid orange II by wet oxidation of hydroperoxide (CWPO) OII) Dye Wastewater. The results show that Fe-Zn-Al-Mt catalyst with Fe / Zn molar ratio of 3/7 and calcination temperature of 500 ℃ formed more active components on the surface of montmorillonite (Zn Fe2O 4 nanoparticles) , Which was the best for CWPO degradation of OII dye wastewater. The removal rates of chroma and COD were as high as 99.9% and 79.7%, respectively, and the release rate of Fe ions was only 0.27 mg / L. In addition, microwave-assisted preparation of Fe-Zn-Al (3/7) -Mt catalyst repeated use of 5 times, can make the wastewater fade, COD removal rate decreased by only 3.1%, total Fe ion dissolution was only 0.42 mg / L. It indicates that the Fe-Zn-Al-Mt catalyst has high catalytic activity and stability when it is used to degrade OII dye wastewater.