吴小宁2,
王倩2,
李蓉1
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
BAI Qingqing1,,WU Xiaoning2,
WANG Qian2,
LI Rong1
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
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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。
关键词: 过碳酸钠/
类Fenton反应/
反应速率常数/
反应活化能
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.
Key words:sodium percarbonate/
Fenton-like reaction/
reaction rate constants/
reaction activation energies.
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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
白青青1,,吴小宁2,
王倩2,
李蓉1
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)
关键词: 过碳酸钠/
类Fenton反应/
反应速率常数/
反应活化能
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。
English Abstract
Kinetics of degradation of methylene blue in a Fenton-like system based on sodium percarbonate
BAI Qingqing1,,WU Xiaoning2,
WANG Qian2,
LI Rong1
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
Keywords: sodium percarbonate/
Fenton-like reaction/
reaction rate constants/
reaction activation energies
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.
