低频超声协同Fe-Ni-Mn/Al2O3催化降解酸性绿B的研究 |
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引用本文: | 郑怀礼,;张占梅. 低频超声协同Fe-Ni-Mn/Al2O3催化降解酸性绿B的研究[J]. 环境污染治理技术与设备, 2009, 0(2): 193-198 |
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作者姓名: | 郑怀礼, 张占梅 |
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作者单位: | [1]重庆大学三峡库区生态环境教育部重点实验室,重庆400045; [2]重庆大学城市建设与环境工程学院,重庆400045 |
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基金项目: | 基金项目:国家自然科学基金资助项目(20777095);教育部科技创新工程重大项目培育基金(708071);重庆大学研究生科技创新基金(200701Y1A0250211) |
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摘 要: | 采用低频超声与Fe-Ni-Mn/Al2O3催化剂协同降解偶氮染料酸性绿B模拟废水,考察染料初始浓度和pH值、催化剂、饱和气体及H2O2等因素对酸性绿B降解效果的影响,结果表明:催化剂Fe-Ni-Mn/Al2O3与低频超声存在协同效应,催化剂的最佳投加量为6g/L;酸性条件有利于染料的超声降解,当pH=3.8时,可取得最佳的降解效果;酸性绿B降解率随初始浓度的增大而降低,其优化初始浓度为100mg/L,此外,在反应体系中鼓入饱和气体也可促进酸性B的降解,且影响顺序为混合气体(air+Ar)〉氧气〉氩气;在反应过程中投加H2O2有利于染料降解率的提高。在优化实验条件下降解150min,酸性绿B色度去除率达到91.4%。
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关 键 词: | 低频超声 降解 酸性绿B 催化剂 |
Degradation of acid green B by low-frequency ultrasound synergized with Fe-Ni-Mn/Al2O3 |
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Affiliation: | Zheng Huaili Zhang Zhanmei( Key laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University,Chongqing 400045 2. Faculty of Urban Construction & Environmental Engineering, Chongqing University, Chongqing 400045) |
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Abstract: | The degradation of azo dye acid green B in aqueous solution was studied by low-frequency ultra- sound in the presence of catalyst Fe-Ni-Mn/Al2O3. The effects of initial concentration and pH value of dyestuff solution, catalyst, saturated gas and H2O2 on degradation of acid green B were investigated. The results show that catalyst Fe-Ni-Mn/Al2O3 is favorable for degradation of acid green B and there exist synergetic effects in Fe-Ni-Mn/Al2O3 catalyst combined with low-frequency ultrasonic irradiation. The optimal dosage of catalyst Fe-Ni-Mn/Al2O3 is 6 g/L. The degradation rate of acid green B is highly dependent on pH value and acidic condition helps to promote the degradation of acid green B. The optimum degradation rate of acid green B can be achieved when pH value is 3.8. However, the degradation rate decreases with the increase of dye initial concentration and optimal concentration is 100 mg/L. Moreover, degradation rate of acid green B is enhanced significantly in the presence of saturated gases used in this study. The favorable effects on degradation of acid green are listed in the following decreasing order: mixed gas (air + argon) 〉 oxygen 〉 argon. Dosage of H2O2 to the reaction system is proved to be beneficial to the degradation of acid green B. 91.4% of colourity removal rate of acid green B can be achieved under the optimal experimental conditions. |
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Keywords: | low-frequency ultrasound degradation acid green B catalyst |
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