改性沸石异相催化过硫酸氢钾降解罗丹明6G研究
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摘要
通过水热法制备Co改性沸石催化剂(Co/沸石),采用SEM、XRD、FTIR和BET等对制备的产品进行了表征,并利用其催化过硫酸氢钾(PMS)降解染料罗丹明6G。实验结果表明,Co/沸石可以高效催化PMS降解罗丹明6G。提高Co/沸石和PMS浓度,罗丹明6G降解效率增大;溶液初始pH在5～11范围内,均可获得较高的降解率;HCO_3ˉ对降解反应具有抑制作用;提高反应温度,有利于降解反应的进行。SO_4~(·-)和~1O_2是降解反应的主要活性氧物种。Co/沸石在重复利用3次后仍具有较好的催化性能。
Cobalt modified zeolite(Co/zeolite)catalyst has been prepared by hydrothermal method,characterized by SEM,XRD,FTIR and BET,and used for catalyzing the degradation of rhodamine 6G by potassium peroxymonosulfate(PMS).The experimental results show that Co/zeolite can efficiently catalyze the degradation of rhodamine 6G by PMS.With the increase of the concentrations of Co/zeolite and PMS,the rhodamine 6G degradation efficiency is increased.When the solution initial pH is in the range of 5-11,comparatively high degrading rates can all be obtained.HCO_3~-has inhibiting effect on degradation reaction.Increasing the reaction temperature is advantageous to the implementation of degradation reaction.SO_4~(·-)and~1O_2are the main active oxygen species of degradation reaction.The Co/zeolite still exhibits comparatively good catalyzing capability after being used 3 times repeatedly.
Cobalt modified zeolite(Co/zeolite)catalyst has been prepared by hydrothermal method,characterized by SEM,XRD,FTIR and BET,and used for catalyzing the degradation of rhodamine 6G by potassium peroxymonosulfate(PMS).The experimental results show that Co/zeolite can efficiently catalyze the degradation of rhodamine 6G by PMS.With the increase of the concentrations of Co/zeolite and PMS,the rhodamine 6G degradation efficiency is increased.When the solution initial pH is in the range of 5-11,comparatively high degrading rates can all be obtained.HCO_3~-has inhibiting effect on degradation reaction.Increasing the reaction temperature is advantageous to the implementation of degradation reaction.SO_4~(·-)and~1O_2are the main active oxygen species of degradation reaction.The Co/zeolite still exhibits comparatively good catalyzing capability after being used 3 times repeatedly.
引文
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[3]Fan Yanan,Ma Wenjie,He Jianglong,et al. CoMoO4as a novel heterogeneous catalyst of peroxymonosulfate activation for the degradation of organic dyes[J]. RSC Advances,2017,7(57):36193-36200.
[4]Lu Xian,Shao Yisheng,Gao Naiyun,et al. Degradation of diclofenac by UV-activated persulfate process:Kinetic studies,degradation pathways and toxicity assessments[J]. Ecotoxicology and Environmental Safety,2017,141:139-147.
[5]Anipsitakis G P,Dionysiou D D. Radical generation by the interaction of transition metals with common oxidants[J]. Environmental Science&Technology,2004,38(13):3705-3712.
[6]Qin Wenxiu,Fang Guodong,Wang Yujun,et al. Efficient transformation of DDT by peroxymonosulfate activated with cobalt in aqueous systems:Kinetics,products,and reactive species identification[J].Chemosphere,2016,148:68-76.
[7]Ji Yuefei,Dong Changxun,Kong Deyang,et al. New insights into atrazine degradation by cobalt catalyzed peroxymonosulfate oxidation:Kinetics,reaction products and transformation mechanisms[J]. Journal of Hazardous Materials,2015,285:491-500.
[8]Ball D L,Edwards J O. The kinetics and mechanism of the decomposition of Caro’s acid. I[J]. Journal of the American Chemical Society,1956,78(6):1125-1129.