花生壳磁性炭材料构筑非均相Fenton反应去除亚甲基蓝研究
发布时间：2019-02-21 12:39
【摘要】：本论文用花生壳磁性碳材料作为催化剂构筑非均相Fenton体系,通过对比不同Fenton催化剂(四氧化三铁、氯化铁、氯化亚铁等)在相同反应条件下对亚甲基蓝的处理结果,最终得出花生壳磁性碳材料与氯化亚铁对亚甲基蓝溶液的处理效果十分显著,由于氯化亚铁在溶液中呈离子状态,反应后有铁泥生成不易回收,对溶液造成二次污染。因此本实验选定用花生壳磁性碳材料作为Fenton催化剂来对亚甲基蓝进行降解。采用静态实验方法对不同反应条件下亚甲基蓝的降解效果进行研究,确定最佳反应条件为:1mL浓度为22.5mmoL/L的H2O2、20mL亚甲基蓝溶液初始浓度为40mmo L/L、催化剂投加量为40mg、pH为6.2、反应进行时间为30min。以此最佳条件在常温下进行反应亚甲基蓝溶液的降解率高达99.6%,COD的去除率也较高。通过对花生壳磁性碳材料构筑非均相Fenton体系静态降解亚甲基蓝溶液的动力学研究,考察了不同反应条件对反应速率的影响,确定了动力学反应速率常数KB=0.12951min-1,Ea(反应活化能)为5051J/moL。在非均相Fenton体系对亚甲基蓝溶液静态降解的最佳反应条件研究的基础上,对动态降解亚甲基蓝溶液进行研究。通过单因素实验法考察了在不同溶液初始浓度、溶液pH、催化剂投加量、流速等条件下亚甲基蓝溶液的降解效果。当反应条件为:1L 60mg/L的亚甲基蓝溶液、1.3g花生壳磁性炭、75m L 22.5mmo L/L的H2O2取,时间为反应后溶液从有颜色时开始计时到255min(常温下每隔5min取样测其浓度)。考察溶液的初始pH值、双氧水的浓度、流速、初始溶液浓度等单因素分别改变时,对亚甲基蓝溶液的降解率的影响程度。从处理后的溶液有色开始计时(每5min取一次样测试其浓度)直至250min。当处理后的亚甲基蓝浓度趋于平衡时:(1)pH分别为1.72、3.18、4.93、6.8和9.0时亚甲基蓝的降解率,pH值为1.72时,降解率大约为38.5%,而pH为3.18时降解率大约为40.8%,pH增大到9.0时,降解率大约为25.5%;(2)H2O2浓度分别为15mmo L/L、22.5mmo L/L、30mmoL/L、37.5mmo L/L和45mmoL/L时亚甲基蓝的降解率,当双氧水浓度为15mmo L/L时,降解率约为32.97%,双氧水浓度增加到45mmo L/L时,亚甲基蓝的降解率约为24.03%;(3)催化剂用量分别为0.6g、0.8g、1.0g、1.3g和1.6g时亚甲基蓝的降解率,催化剂投加量为0.6g时,亚甲基蓝降解率约为13.32%,投加量增大到0.8g时,降解率也增大为15.33%,持续增加催化剂的投加量直到1.6g时,溶液降解率达到31.5%;(4)流速为3.8cm3/min时,亚甲基蓝降解率约为43.2%,流速增大为4.9cm3/min时,降解率约为36.2%,当流速增大到8.4cm3/min时,降解率仅约为12.8%;(5)溶液初始浓度分别为20mg/L、40mg/L和60mg/L时亚甲基蓝的降解率,降解率分别大约为42.8%、35.4%和27.7%,当溶液的初始浓度分别为80mg/L和100mg/L时,降解率分别大约为18.25%和12.8%。结论为:不同单因素均对降解效果有显著的影响。
[Abstract]:In this paper, a heterogeneous Fenton system was constructed using peanut shell magnetic carbon as catalyst. The results of treatment of methylene blue with different Fenton catalysts (Fe _ 2O _ 4, etc.) under the same reaction conditions were compared. Finally, it was concluded that the treatment of methylene blue solution by magnetic carbon material and ferrous chloride in peanut shell was very remarkable. Due to the ionic state of ferrous chloride in the solution, the iron sludge formed after the reaction was not easy to be recovered, which caused secondary pollution to the solution. Therefore, the magnetic carbon material of peanut shell was selected as Fenton catalyst to degrade methylene blue. The degradation effect of methylene blue under different reaction conditions was studied by static experiment. The optimum reaction conditions were determined as follows: the initial concentration of H _ 2O _ 2 and methylene blue solution with 1mL concentration of 22.5mmoL/L was 40mmo L / L, and the dosage of catalyst was 40 mg. PH was 6.2 and reaction time was 30 min. The degradation rate of methylene blue solution was as high as 99.6% and the removal rate of COD was also higher at normal temperature. The kinetics of static degradation of methylene blue solution with heterogeneous Fenton system constructed from magnetic carbon materials of peanut shell was studied. The effect of different reaction conditions on the reaction rate was investigated, and the kinetic rate constant KB=0.12951min-1, was determined. Ea (reaction activation energy) is 5051 J / mol. The dynamic degradation of methylene blue solution was studied on the basis of the study of optimal reaction conditions for the static degradation of methylene blue solution by heterogeneous Fenton system. The degradation effect of methylene blue solution under different initial concentration of solution, dosage of pH, catalyst and flow rate was investigated by single factor experiment. When the reaction conditions are as follows: 1L 60mg/L methylene blue solution, 1.3g peanut shell magnetic carbon, 75ml 22.5mmo L / L H2O2, the reaction time is from color to 255min. The degree of influence on the degradation rate of methylene blue solution was investigated when the initial pH value, the concentration of hydrogen peroxide, the flow rate and the initial concentration of the solution were changed respectively. The chromatic time of the treated solution (take a sample per 5min to test its concentration) until 250 mins. When the concentration of methylene blue tended to be in equilibrium after treatment: (1) the degradation rate of methylene blue was 1.72 ~ 3.183.184.933.68 and 9.0, respectively. The degradation rate of methylene blue was about 38.5 when the pH value was 1.72. When the pH was 3.18, the degradation rate was about 40.8 and pH was 9.0, and the degradation rate was about 25.5; (2) the degradation rate of methylene blue at the concentration of 15mmo L / L = 22.5mmo / L / L = 30mmol / L = 37.5 mmo L / L and 45mmoL/L, respectively, and the degradation rate of methylene blue was about 32.97 when the concentration of H _ 2O _ 2 was 15mmo L / L. When the concentration of hydrogen peroxide increased to 45mmo L / L, the degradation rate of methylene blue was about 24.03; (3) the degradation rate of methylene blue was about 13.32g when the amount of catalyst was 0.6 g ~ 0.8g ~ (-1) g ~ (-1) and 1.6 g ~ (-1) g respectively. When the dosage of catalyst was 0.6 g, the degradation rate of methylene blue was about 13.32%, and when the dosage of catalyst was 0.8 g, the degradation rate of methylene blue was increased to 0.8 g. The degradation rate also increased to 15.33. When the amount of catalyst was increased to 1.6 g, the degradation rate of the solution reached 31.5. (4) when the flow rate is 3.8cm3/min, the degradation rate of methylene blue is about 43.2, when the velocity of flow increases to 4.9cm3/min, the degradation rate is about 36.2. When the flow rate increases to 8.4cm3/min, the degradation rate is only about 12.8; (5) the degradation rate of methylene blue at 20 mg / L 40 mg / L and 60mg/L was about 42.835. 4% and 27. 7%, respectively. When the initial concentration of solution was 80mg/L and 100mg/L, respectively, The degradation rates were 18.25% and 12.8%, respectively. The results showed that different single factors had a significant effect on the degradation effect.
【学位授予单位】：西北师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X791;O643.36
本文编号：2427506
[Abstract]:In this paper, a heterogeneous Fenton system was constructed using peanut shell magnetic carbon as catalyst. The results of treatment of methylene blue with different Fenton catalysts (Fe _ 2O _ 4, etc.) under the same reaction conditions were compared. Finally, it was concluded that the treatment of methylene blue solution by magnetic carbon material and ferrous chloride in peanut shell was very remarkable. Due to the ionic state of ferrous chloride in the solution, the iron sludge formed after the reaction was not easy to be recovered, which caused secondary pollution to the solution. Therefore, the magnetic carbon material of peanut shell was selected as Fenton catalyst to degrade methylene blue. The degradation effect of methylene blue under different reaction conditions was studied by static experiment. The optimum reaction conditions were determined as follows: the initial concentration of H _ 2O _ 2 and methylene blue solution with 1mL concentration of 22.5mmoL/L was 40mmo L / L, and the dosage of catalyst was 40 mg. PH was 6.2 and reaction time was 30 min. The degradation rate of methylene blue solution was as high as 99.6% and the removal rate of COD was also higher at normal temperature. The kinetics of static degradation of methylene blue solution with heterogeneous Fenton system constructed from magnetic carbon materials of peanut shell was studied. The effect of different reaction conditions on the reaction rate was investigated, and the kinetic rate constant KB=0.12951min-1, was determined. Ea (reaction activation energy) is 5051 J / mol. The dynamic degradation of methylene blue solution was studied on the basis of the study of optimal reaction conditions for the static degradation of methylene blue solution by heterogeneous Fenton system. The degradation effect of methylene blue solution under different initial concentration of solution, dosage of pH, catalyst and flow rate was investigated by single factor experiment. When the reaction conditions are as follows: 1L 60mg/L methylene blue solution, 1.3g peanut shell magnetic carbon, 75ml 22.5mmo L / L H2O2, the reaction time is from color to 255min. The degree of influence on the degradation rate of methylene blue solution was investigated when the initial pH value, the concentration of hydrogen peroxide, the flow rate and the initial concentration of the solution were changed respectively. The chromatic time of the treated solution (take a sample per 5min to test its concentration) until 250 mins. When the concentration of methylene blue tended to be in equilibrium after treatment: (1) the degradation rate of methylene blue was 1.72 ~ 3.183.184.933.68 and 9.0, respectively. The degradation rate of methylene blue was about 38.5 when the pH value was 1.72. When the pH was 3.18, the degradation rate was about 40.8 and pH was 9.0, and the degradation rate was about 25.5; (2) the degradation rate of methylene blue at the concentration of 15mmo L / L = 22.5mmo / L / L = 30mmol / L = 37.5 mmo L / L and 45mmoL/L, respectively, and the degradation rate of methylene blue was about 32.97 when the concentration of H _ 2O _ 2 was 15mmo L / L. When the concentration of hydrogen peroxide increased to 45mmo L / L, the degradation rate of methylene blue was about 24.03; (3) the degradation rate of methylene blue was about 13.32g when the amount of catalyst was 0.6 g ~ 0.8g ~ (-1) g ~ (-1) and 1.6 g ~ (-1) g respectively. When the dosage of catalyst was 0.6 g, the degradation rate of methylene blue was about 13.32%, and when the dosage of catalyst was 0.8 g, the degradation rate of methylene blue was increased to 0.8 g. The degradation rate also increased to 15.33. When the amount of catalyst was increased to 1.6 g, the degradation rate of the solution reached 31.5. (4) when the flow rate is 3.8cm3/min, the degradation rate of methylene blue is about 43.2, when the velocity of flow increases to 4.9cm3/min, the degradation rate is about 36.2. When the flow rate increases to 8.4cm3/min, the degradation rate is only about 12.8; (5) the degradation rate of methylene blue at 20 mg / L 40 mg / L and 60mg/L was about 42.835. 4% and 27. 7%, respectively. When the initial concentration of solution was 80mg/L and 100mg/L, respectively, The degradation rates were 18.25% and 12.8%, respectively. The results showed that different single factors had a significant effect on the degradation effect.
【学位授予单位】：西北师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X791;O643.36
【参考文献】
相关期刊论文 前1条
1 王九思,韩相恩,赵红花;絮凝沉淀—Fenton氧化法处理印染废水[J];兰州铁道学院学报;2001年06期
，本文编号：2427506
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