The electrochemical synthesis of urea by simultaneous reduction of nitrite and CO2 was performed in 0.02 mol·L-1 NaNO2 and 0.2 mol·L-1 NaHCO3 aqueous solutions at 925 Ag electrode in laboratory-scale experim...The electrochemical synthesis of urea by simultaneous reduction of nitrite and CO2 was performed in 0.02 mol·L-1 NaNO2 and 0.2 mol·L-1 NaHCO3 aqueous solutions at 925 Ag electrode in laboratory-scale experiments.The effect of several parameters, including electrolysis potential, temperature, and CO2 pressure, on urea formation was investigated.At the temperature of 293 K,CO2 pressure of 0.7 MPa, the electrolytic potential of -0.6 V, the current efficiency of urea formation reached 37%.Under the conditions of temperature of 273 K and electrolytic potential of -1.7 V, the current efficiency reached 26% under normal ambient pressure.Based on the relationship of current efficiency and formation of CO, NH3 and urea, a tentative reaction pathway was proposed.展开更多
本实验以阿司匹林模拟废水为研究对象,采用Ti/PbO_2电极为阳极,通过考察电解质浓度、初始浓度和电流密度等工艺参数来研究阿司匹林与COD的去除情况。经研究发现,在电解质浓度为0.10 mol/L,初始浓度为100 mg/L,电流密度为30 m A/cm^2时,...本实验以阿司匹林模拟废水为研究对象,采用Ti/PbO_2电极为阳极,通过考察电解质浓度、初始浓度和电流密度等工艺参数来研究阿司匹林与COD的去除情况。经研究发现,在电解质浓度为0.10 mol/L,初始浓度为100 mg/L,电流密度为30 m A/cm^2时,阿司匹林和COD的去除最佳,去除率分别为96.88%与67.85%。本文研究表明电化学氧化法对于制药废水的处理具有良好的效果,对制药废水预处理和深度处理有一定的指导意义。展开更多
文摘The electrochemical synthesis of urea by simultaneous reduction of nitrite and CO2 was performed in 0.02 mol·L-1 NaNO2 and 0.2 mol·L-1 NaHCO3 aqueous solutions at 925 Ag electrode in laboratory-scale experiments.The effect of several parameters, including electrolysis potential, temperature, and CO2 pressure, on urea formation was investigated.At the temperature of 293 K,CO2 pressure of 0.7 MPa, the electrolytic potential of -0.6 V, the current efficiency of urea formation reached 37%.Under the conditions of temperature of 273 K and electrolytic potential of -1.7 V, the current efficiency reached 26% under normal ambient pressure.Based on the relationship of current efficiency and formation of CO, NH3 and urea, a tentative reaction pathway was proposed.
文摘本实验以阿司匹林模拟废水为研究对象,采用Ti/PbO_2电极为阳极,通过考察电解质浓度、初始浓度和电流密度等工艺参数来研究阿司匹林与COD的去除情况。经研究发现,在电解质浓度为0.10 mol/L,初始浓度为100 mg/L,电流密度为30 m A/cm^2时,阿司匹林和COD的去除最佳,去除率分别为96.88%与67.85%。本文研究表明电化学氧化法对于制药废水的处理具有良好的效果,对制药废水预处理和深度处理有一定的指导意义。
