花生殼磁性炭材料構(gòu)筑非均相Fenton反應(yīng)去除亞甲基藍(lán)研究
發(fā)布時(shí)間：2019-02-21 12:39
【摘要】：本論文用花生殼磁性碳材料作為催化劑構(gòu)筑非均相Fenton體系,通過對(duì)比不同F(xiàn)enton催化劑(四氧化三鐵、氯化鐵、氯化亞鐵等)在相同反應(yīng)條件下對(duì)亞甲基藍(lán)的處理結(jié)果,最終得出花生殼磁性碳材料與氯化亞鐵對(duì)亞甲基藍(lán)溶液的處理效果十分顯著,由于氯化亞鐵在溶液中呈離子狀態(tài),反應(yīng)后有鐵泥生成不易回收,對(duì)溶液造成二次污染。因此本實(shí)驗(yàn)選定用花生殼磁性碳材料作為Fenton催化劑來對(duì)亞甲基藍(lán)進(jìn)行降解。采用靜態(tài)實(shí)驗(yàn)方法對(duì)不同反應(yīng)條件下亞甲基藍(lán)的降解效果進(jìn)行研究,確定最佳反應(yīng)條件為:1mL濃度為22.5mmoL/L的H2O2、20mL亞甲基藍(lán)溶液初始濃度為40mmo L/L、催化劑投加量為40mg、pH為6.2、反應(yīng)進(jìn)行時(shí)間為30min。以此最佳條件在常溫下進(jìn)行反應(yīng)亞甲基藍(lán)溶液的降解率高達(dá)99.6%,COD的去除率也較高。通過對(duì)花生殼磁性碳材料構(gòu)筑非均相Fenton體系靜態(tài)降解亞甲基藍(lán)溶液的動(dòng)力學(xué)研究,考察了不同反應(yīng)條件對(duì)反應(yīng)速率的影響,確定了動(dòng)力學(xué)反應(yīng)速率常數(shù)KB=0.12951min-1,Ea(反應(yīng)活化能)為5051J/moL。在非均相Fenton體系對(duì)亞甲基藍(lán)溶液靜態(tài)降解的最佳反應(yīng)條件研究的基礎(chǔ)上,對(duì)動(dòng)態(tài)降解亞甲基藍(lán)溶液進(jìn)行研究。通過單因素實(shí)驗(yàn)法考察了在不同溶液初始濃度、溶液pH、催化劑投加量、流速等條件下亞甲基藍(lán)溶液的降解效果。當(dāng)反應(yīng)條件為:1L 60mg/L的亞甲基藍(lán)溶液、1.3g花生殼磁性炭、75m L 22.5mmo L/L的H2O2取,時(shí)間為反應(yīng)后溶液從有顏色時(shí)開始計(jì)時(shí)到255min(常溫下每隔5min取樣測(cè)其濃度)�？疾烊芤旱某跏紁H值、雙氧水的濃度、流速、初始溶液濃度等單因素分別改變時(shí),對(duì)亞甲基藍(lán)溶液的降解率的影響程度。從處理后的溶液有色開始計(jì)時(shí)(每5min取一次樣測(cè)試其濃度)直至250min。當(dāng)處理后的亞甲基藍(lán)濃度趨于平衡時(shí):(1)pH分別為1.72、3.18、4.93、6.8和9.0時(shí)亞甲基藍(lán)的降解率,pH值為1.72時(shí),降解率大約為38.5%,而pH為3.18時(shí)降解率大約為40.8%,pH增大到9.0時(shí),降解率大約為25.5%;(2)H2O2濃度分別為15mmo L/L、22.5mmo L/L、30mmoL/L、37.5mmo L/L和45mmoL/L時(shí)亞甲基藍(lán)的降解率,當(dāng)雙氧水濃度為15mmo L/L時(shí),降解率約為32.97%,雙氧水濃度增加到45mmo L/L時(shí),亞甲基藍(lán)的降解率約為24.03%;(3)催化劑用量分別為0.6g、0.8g、1.0g、1.3g和1.6g時(shí)亞甲基藍(lán)的降解率,催化劑投加量為0.6g時(shí),亞甲基藍(lán)降解率約為13.32%,投加量增大到0.8g時(shí),降解率也增大為15.33%,持續(xù)增加催化劑的投加量直到1.6g時(shí),溶液降解率達(dá)到31.5%;(4)流速為3.8cm3/min時(shí),亞甲基藍(lán)降解率約為43.2%,流速增大為4.9cm3/min時(shí),降解率約為36.2%,當(dāng)流速增大到8.4cm3/min時(shí),降解率僅約為12.8%;(5)溶液初始濃度分別為20mg/L、40mg/L和60mg/L時(shí)亞甲基藍(lán)的降解率,降解率分別大約為42.8%、35.4%和27.7%,當(dāng)溶液的初始濃度分別為80mg/L和100mg/L時(shí),降解率分別大約為18.25%和12.8%。結(jié)論為:不同單因素均對(duì)降解效果有顯著的影響。
[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.
【學(xué)位授予單位】：西北師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X791;O643.36
本文編號(hào)：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.
【學(xué)位授予單位】：西北師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X791;O643.36
【參考文獻(xiàn)】
相關(guān)期刊論文 前1條
1 王九思,韓相恩,趙紅花;絮凝沉淀—Fenton氧化法處理印染廢水[J];蘭州鐵道學(xué)院學(xué)報(bào);2001年06期
，本文編號(hào)：2427506
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