超声场强化光催化氧化—无机膜微滤过程的研究
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摘要
论文在超声场强化光催化氧化-无机膜分离集成反应器中,将超声场强化技术与无机膜分离技术、光催化氧化技术相集成,研究超声强化作用下,低浓度苯酚溶液、聚丙烯酰胺溶液的光催化氧化降解作用和TiO2颗粒悬浆体系、聚丙烯酰胺溶液体系的无机膜分离过程。
采用超声场强化光催化氧化降解低浓度苯酚溶液体系,研究了光催化氧化反应过程,优化了反应操作条件为:苯酚初始浓度14 mg·L-1,TiO2用量2000 mg·L-1,溶液pH值为9,超声功率150 w,超声频率45 kHz,超声场协同作用能极大地提高光催化反应速率和苯酚降解率。研究了超声场强化光催化氧化降解低浓度苯酚溶液的动力学模型,计算结果很好地验证了超声对光催化氧化的协同作用。
通过超声场强化光催化氧化降解低浓度聚丙烯酰胺溶液的过程参数研究,得到了优化反应参数:超声功率150 w,超声频率45 kHz,超声场强化光催化反应的协同效果明显优于单一光催化氧化降解过程。对超声协同光催化氧化降解的机理及动力学模型初步研究结果表明,超声场协同光催化氧化降解高分子量聚丙烯酰胺反应呈一级反应动力学特征。
采用超声场协同强化无机膜分离TiO2颗粒悬浆体系和聚丙烯酰胺溶液体系,研究了分离过程参数。TiO2悬浆液优化操作条件为:操作压力0.1-0.15 MPa,温度298 K-303 K,溶液浓度1000-1500 mg·L-1,溶液pH值2.0-4.0,膜面错流速度0.8 m·s-1,超声功率150 w,超声频率45 kHz,超声场强化作用使膜通量提高了12 %-15 %。低浓度聚丙烯酰胺溶液的优化分离条件为:操作压力0.10 MPa,温度303 K,溶液浓度1000 mg·L-1,溶液pH值11,膜面错流速度1.0 m·s-1,超声功率100 w超声场的强化作用使膜通量提高了5 %-7 %。同时,研究了超声场强化无机膜分离TiO2悬浆液和聚丙烯酰胺溶液的数学模型。
In the reactor of ultrasonic-enhanced photocatalysis with inorganic membrane separation, we coupled ultrasound field, photocatalysis and membrane separation for photocatalytic oxidative degradation of low concentration phenol solution and polyacrylamide solution, using inorganic membrane to separate TiO2 particles from slurry system.
Photocatalysis degradation of phenol was investigated. The pH value, reaction temperature, the initial concentration of the phenol Solution ultrasound power, ultrasound frequency on the integrated process was investigated. We fixed pH value of 9.0, temperature of 308 K, phenol concentration of 14 mg.L-1,ultrasonic power of 150 w and frequency of 45 kHz. Ultrasound can greatly improve the photocatalytic reaction rate and phenol degradation rate. We Studied dynamic model of ultrasound enhanced photocatalytic oxidative degradation of low concentration phenol solution, the results showed that ultrasound can enhance photocatalytic oxidation.
Photocatalysis degradation of PAM solution was investigated. The effect of ultrasound power, ultrasound frequency was investigated. We fixed ultrasonic power of 150 w and frequency of 45 kHz. Ultrasound enhanced photocatalytic degradation, showing superior performance compared to only photocatalytic oxidation degradation process or only ultrasonic degradation process. We investigated the mechanism and kinetic model of ultrasonic-enhanced photocatalytic oxidation degradation, the result show that the ultrasonic enhance photocatalytic oxidation degradation polyacrylamide solution was first order reaction kinetics.
In the reactor of ultrasonic-enhanced inorganic membrane separation, the ultrasound power, ultrasound frequency was investigated. We fixed the operation pressure of 0.1-0.15 MPa,cross-flow velocity of 0.8 m·s-1, solution concentration 1000-1500 mg·L-1, solution temperature of 298-303 K, pH value of 2.0-4.0, ultrasonic power of 100 w and frequency of 45 kHz for TiO2 particles slurry system. The increment of the permeation flux was 12 %-15 % under optimized conditions. We fixed the operating pressure 0.1 MPa, cross-flow velocity1.0 m·s-1, solution concentration 1000 mg·L-1, solution temperature303 K, pH value of 11.0,,ultrasonic power of 100 w and frequency of 45 kHz for PAM solution system. The increment of the permeation flux was 12 %-15 % under optimized conditions. Model to describe the ultrasound-enhanced inorganic membrane separation of polyacylamide (PAM) suspension was proposed based upon the experimental results and analysis of forces acted upon particles.
采用超声场强化光催化氧化降解低浓度苯酚溶液体系,研究了光催化氧化反应过程,优化了反应操作条件为:苯酚初始浓度14 mg·L-1,TiO2用量2000 mg·L-1,溶液pH值为9,超声功率150 w,超声频率45 kHz,超声场协同作用能极大地提高光催化反应速率和苯酚降解率。研究了超声场强化光催化氧化降解低浓度苯酚溶液的动力学模型,计算结果很好地验证了超声对光催化氧化的协同作用。
通过超声场强化光催化氧化降解低浓度聚丙烯酰胺溶液的过程参数研究,得到了优化反应参数:超声功率150 w,超声频率45 kHz,超声场强化光催化反应的协同效果明显优于单一光催化氧化降解过程。对超声协同光催化氧化降解的机理及动力学模型初步研究结果表明,超声场协同光催化氧化降解高分子量聚丙烯酰胺反应呈一级反应动力学特征。
采用超声场协同强化无机膜分离TiO2颗粒悬浆体系和聚丙烯酰胺溶液体系,研究了分离过程参数。TiO2悬浆液优化操作条件为:操作压力0.1-0.15 MPa,温度298 K-303 K,溶液浓度1000-1500 mg·L-1,溶液pH值2.0-4.0,膜面错流速度0.8 m·s-1,超声功率150 w,超声频率45 kHz,超声场强化作用使膜通量提高了12 %-15 %。低浓度聚丙烯酰胺溶液的优化分离条件为:操作压力0.10 MPa,温度303 K,溶液浓度1000 mg·L-1,溶液pH值11,膜面错流速度1.0 m·s-1,超声功率100 w超声场的强化作用使膜通量提高了5 %-7 %。同时,研究了超声场强化无机膜分离TiO2悬浆液和聚丙烯酰胺溶液的数学模型。
In the reactor of ultrasonic-enhanced photocatalysis with inorganic membrane separation, we coupled ultrasound field, photocatalysis and membrane separation for photocatalytic oxidative degradation of low concentration phenol solution and polyacrylamide solution, using inorganic membrane to separate TiO2 particles from slurry system.
Photocatalysis degradation of phenol was investigated. The pH value, reaction temperature, the initial concentration of the phenol Solution ultrasound power, ultrasound frequency on the integrated process was investigated. We fixed pH value of 9.0, temperature of 308 K, phenol concentration of 14 mg.L-1,ultrasonic power of 150 w and frequency of 45 kHz. Ultrasound can greatly improve the photocatalytic reaction rate and phenol degradation rate. We Studied dynamic model of ultrasound enhanced photocatalytic oxidative degradation of low concentration phenol solution, the results showed that ultrasound can enhance photocatalytic oxidation.
Photocatalysis degradation of PAM solution was investigated. The effect of ultrasound power, ultrasound frequency was investigated. We fixed ultrasonic power of 150 w and frequency of 45 kHz. Ultrasound enhanced photocatalytic degradation, showing superior performance compared to only photocatalytic oxidation degradation process or only ultrasonic degradation process. We investigated the mechanism and kinetic model of ultrasonic-enhanced photocatalytic oxidation degradation, the result show that the ultrasonic enhance photocatalytic oxidation degradation polyacrylamide solution was first order reaction kinetics.
In the reactor of ultrasonic-enhanced inorganic membrane separation, the ultrasound power, ultrasound frequency was investigated. We fixed the operation pressure of 0.1-0.15 MPa,cross-flow velocity of 0.8 m·s-1, solution concentration 1000-1500 mg·L-1, solution temperature of 298-303 K, pH value of 2.0-4.0, ultrasonic power of 100 w and frequency of 45 kHz for TiO2 particles slurry system. The increment of the permeation flux was 12 %-15 % under optimized conditions. We fixed the operating pressure 0.1 MPa, cross-flow velocity1.0 m·s-1, solution concentration 1000 mg·L-1, solution temperature303 K, pH value of 11.0,,ultrasonic power of 100 w and frequency of 45 kHz for PAM solution system. The increment of the permeation flux was 12 %-15 % under optimized conditions. Model to describe the ultrasound-enhanced inorganic membrane separation of polyacylamide (PAM) suspension was proposed based upon the experimental results and analysis of forces acted upon particles.
引文
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