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基于过碳酸钠的类Fenton体系对亚甲基蓝的降解动力学

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白青青, 吴小宁, 王倩, 李蓉. 基于过碳酸钠的类Fenton体系对亚甲基蓝的降解动力学[J]. 环境工程学报, 2018, 12(1): 110-118. doi: 10.12030/j.cjee.201705105
引用本文: 白青青, 吴小宁, 王倩, 李蓉. 基于过碳酸钠的类Fenton体系对亚甲基蓝的降解动力学[J]. 环境工程学报, 2018, 12(1): 110-118. doi: 10.12030/j.cjee.201705105
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BAI Qingqing, WU Xiaoning, WANG Qian, LI Rong. Kinetics of degradation of methylene blue in a Fenton-like system based on sodium percarbonate[J]. Chinese Journal of Environmental Engineering, 2018, 12(1): 110-118. doi: 10.12030/j.cjee.201705105
Citation: BAI Qingqing, WU Xiaoning, WANG Qian, LI Rong. Kinetics of degradation of methylene blue in a Fenton-like system based on sodium percarbonate[J]. Chinese Journal of Environmental Engineering, 2018, 12(1): 110-118. doi: 10.12030/j.cjee.201705105
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基于过碳酸钠的类Fenton体系对亚甲基蓝的降解动力学

  • 1.

    西安工业大学建筑工程学院,西安 710021

  • 2.

    西安工业大学材料与化工学院,西安 710021

  • 基金项目:

    国家自然科学基金资助项目(51608412)

    陕西省自然科学基础研究计划项目(2016JQ2034)

Kinetics of degradation of methylene blue in a Fenton-like system based on sodium percarbonate

  • 1.

    School of Civil and Architecture Engineering, Xi′an Technological University, Xi′an 710021, China

  • 2.

    School of Materials Science and Chemical Engineering, Xi′an Technological University, Xi′an 710021, China

  • Fund Project:

  • 摘要: 采用改良低温结晶法制备过碳酸钠(sodium percarbonate,SPC),对其进行XRD表征,并用以作为氧化剂构建类Fenton体系(SPC/Fe2+)降解亚甲基蓝(MB),对其降解的影响因素及反应动力学进行了研究。结果表明,在该体系中,当溶液初始pH分别为2~10时,亚甲基蓝的去除率在1 min时均可达到97%以上,说明该体系可高效去除水体中的亚甲基蓝,反应速率快,且过碳酸钠的使用可以拓宽Fenton反应的pH范围。该反应的最佳工艺条件为0.75 g·L-1硫酸亚铁,300 mg·L-1过碳酸钠,亚甲基蓝去除率在反应10 min后可达99.0%。亚甲基蓝在该体系中的降解遵循二级反应动力学方程,反应速率常数分别为64.50×10-3 L·(mol·s)-1,快于Fenton体系的17.83×10-3 L·(mol·s)-1。该体系反应活化能为16.6 kJ·mol-1,远小于Fenton体系(46.234 kJ·mol-1),说明以过碳酸钠为氧化剂更有利于非均相类Fenton反应的发生。
    Abstract: Sodium percarbonate(SPC) was prepared using low temperature crystallization method and characterized with XRD. SPC was used as oxidant to establish a heterogeneous Fenton system for the removal of methylene blue(MB), and the influences factors and kinetics of the reaction were investigated. The results indicated that 97% removal of MB can be obtained at 1 min, with initial solution pH in the range from 2 to 10, which indicated that MB can be removed efficiently at fast rates and pH window of SPC/Fe2+ system can be enlarged. The optimal condition was determined to be 0.75 g·L-1FeSO4·7H2O, 300 mg·L-1SPC, and 99.0% removal of MB can be reached at 10 min. The removal of MB followed pseudo second-order kinetic and the reaction rate was determined to be 64.50×10-3 L·(mol·s)-1,much faster than that 17.83×10-3 L·(mol·s)-1of Fenton reaction. Also, the reaction activation energy 16.6 kJ·mol-1 was much lower than that 46.234 kJ·mol-1 of Fenton reaction, indicating that Fenton reaction was easier to occur using SPC instead of H2O2 as oxidant.
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  • 刊出日期:  2018-01-14

基于过碳酸钠的类Fenton体系对亚甲基蓝的降解动力学

  • 1. 西安工业大学建筑工程学院,西安 710021
  • 2. 西安工业大学材料与化工学院,西安 710021
基金项目:

国家自然科学基金资助项目(51608412)

陕西省自然科学基础研究计划项目(2016JQ2034)

摘要: 采用改良低温结晶法制备过碳酸钠(sodium percarbonate,SPC),对其进行XRD表征,并用以作为氧化剂构建类Fenton体系(SPC/Fe2+)降解亚甲基蓝(MB),对其降解的影响因素及反应动力学进行了研究。结果表明,在该体系中,当溶液初始pH分别为2~10时,亚甲基蓝的去除率在1 min时均可达到97%以上,说明该体系可高效去除水体中的亚甲基蓝,反应速率快,且过碳酸钠的使用可以拓宽Fenton反应的pH范围。该反应的最佳工艺条件为0.75 g·L-1硫酸亚铁,300 mg·L-1过碳酸钠,亚甲基蓝去除率在反应10 min后可达99.0%。亚甲基蓝在该体系中的降解遵循二级反应动力学方程,反应速率常数分别为64.50×10-3 L·(mol·s)-1,快于Fenton体系的17.83×10-3 L·(mol·s)-1。该体系反应活化能为16.6 kJ·mol-1,远小于Fenton体系(46.234 kJ·mol-1),说明以过碳酸钠为氧化剂更有利于非均相类Fenton反应的发生。

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