Fe/Cu共掺杂TiO_2协同脉冲放电处理模拟活性黑废水
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摘要
本文以高压汞灯为激发源,用自制Fe、Cu共掺杂的TiO2纳米粉体在紫外光照射下降解活性黑溶液。综合考虑了Fe、Cu掺杂量,煅烧温度以及煅烧时间联合作用对该催化剂活性的影响,并采用二次回归通用旋转组合设计,对不同条件下活性黑的浓度随时间的变化用一级动力学进行了研究,得出了一个四元二次方程,对方程进行规划求解,得出制备该催化剂的最佳条件。
将上述条件下制备的TiO2协同脉冲放电对模拟活性黑废水进行了处理,考虑了电器参数、溶液参数、催化剂加入对活性黑废水处理的影响,并对中间产物进行了间接测定。
得出主要结论如下：
(1)掺杂的TiO2对活性黑的光催化降解反应为一级反应,活性黑降解脱色速率常数k近似为活性黑溶液初始浓度。
(2)考虑了Fe、Cu掺杂量,煅烧温度以及煅烧时间联合作用对该催化剂活性的影响,并采用二次回归通用旋转组合设计,得出制备该催化剂的最佳条件为煅烧时间为3.55h,煅烧温度为453℃,铜掺杂量为1.89%,铁掺杂量为1.62%。
(3)随着催化剂TiO2投加量的升高,活性黑降解率逐渐增大。但当催化剂量过多时,活性黑降解率开始出现减小趋势。
(4)掺杂少量的Fe和Cu能够提高TiO2光催化活性,但是当掺量较大时,则会使TiO2光催化活性降低。
(5)在脉冲放电条件下,掺杂TiO2比不加催化剂和不掺杂TiO2的降解效果要好。
(6)TiO2降解活性黑紫外光谱分析表明,在脉冲放电下催化剂TiO2能降解活性黑溶液并使其完全脱色,将其中的偶氮结构破坏分解。
This article take the high pressure mercury lamp as the stimulation source, The organic contaminant, REACTIVE Black 5 (RB5) was degraded by Fe/Cu co-doped TiO2 nano-particles under mercury lamp. In the present study, the combined effects of Fe/Cu doping amount, calcination temperature and calcination time on catalyst activity were investigated, and through quadratic regression general rotation design, Using First-level dynamics to research the density of Black 5 change along with time, has obtained three Yuan quadratic equations, carries on the plan solution to the equation the optimal condition for preparing the catalyst was obtained as follows: calcination time,3.55h; calcination temperature,453℃; Cu doping amount,1.89%; Fe doping amount,1.62%.
The TiO2 coordination impulsive discharge which prepares the above condition under to simulated the active black waste water to carry on processing, had considered the electric appliance parameter, the solution parameter, the catalyst joined to activeness black wastewater disposal influence, and has carried on the synopsis determination to the intermediary product.
Draws the main conclusion to be as follows:
(1) Doping's TiO2 to the active black photochemical catalysis degradation reaction is the first-level response, active black degeneration decolorization speed constant k is approximate for the active black solution initial density.
(2) Had considered Fe, the Cu doping quantity, the calcining heat as well as the calcine time joint action to this catalyst active influence, and uses two return general revolving unitized design, obtains prepares this catalyst the optimum condition for the calcine time is 3.55h, the calcining heat for 453℃, the copper doping quantity is 1.89%, the hard doping quantity is 1.62%.
(3) Throws the increment along with catalyst TiO2 elevation, the active black degeneration rate increases gradually. But works as the catalyzed dosage to be excessively many, the active black degeneration rate starts to appear reduces the tendency.
(4) Doping few Fe and Cu can enhance the TiO2 photochemical catalysis activeness, but when mixes the quantity is big, will then cause the TiO2 photochemical catalysis activeness to reduce.
(5) Under the impulsive discharge condition, dopes TiO2 to compare does not add the catalyst and does not dope TiO2 the degeneration effect to be friends with.
(6) The Spectral analysis of black under TiO2 degeneration indicated that catalyst TiO2 can degrade the active black solution under the impulsive discharge and cause it to decolorize completely, azo structure, benzene ring and fused ring disarrangement of the structure decomposition.
将上述条件下制备的TiO2协同脉冲放电对模拟活性黑废水进行了处理,考虑了电器参数、溶液参数、催化剂加入对活性黑废水处理的影响,并对中间产物进行了间接测定。
得出主要结论如下：
(1)掺杂的TiO2对活性黑的光催化降解反应为一级反应,活性黑降解脱色速率常数k近似为活性黑溶液初始浓度。
(2)考虑了Fe、Cu掺杂量,煅烧温度以及煅烧时间联合作用对该催化剂活性的影响,并采用二次回归通用旋转组合设计,得出制备该催化剂的最佳条件为煅烧时间为3.55h,煅烧温度为453℃,铜掺杂量为1.89%,铁掺杂量为1.62%。
(3)随着催化剂TiO2投加量的升高,活性黑降解率逐渐增大。但当催化剂量过多时,活性黑降解率开始出现减小趋势。
(4)掺杂少量的Fe和Cu能够提高TiO2光催化活性,但是当掺量较大时,则会使TiO2光催化活性降低。
(5)在脉冲放电条件下,掺杂TiO2比不加催化剂和不掺杂TiO2的降解效果要好。
(6)TiO2降解活性黑紫外光谱分析表明,在脉冲放电下催化剂TiO2能降解活性黑溶液并使其完全脱色,将其中的偶氮结构破坏分解。
This article take the high pressure mercury lamp as the stimulation source, The organic contaminant, REACTIVE Black 5 (RB5) was degraded by Fe/Cu co-doped TiO2 nano-particles under mercury lamp. In the present study, the combined effects of Fe/Cu doping amount, calcination temperature and calcination time on catalyst activity were investigated, and through quadratic regression general rotation design, Using First-level dynamics to research the density of Black 5 change along with time, has obtained three Yuan quadratic equations, carries on the plan solution to the equation the optimal condition for preparing the catalyst was obtained as follows: calcination time,3.55h; calcination temperature,453℃; Cu doping amount,1.89%; Fe doping amount,1.62%.
The TiO2 coordination impulsive discharge which prepares the above condition under to simulated the active black waste water to carry on processing, had considered the electric appliance parameter, the solution parameter, the catalyst joined to activeness black wastewater disposal influence, and has carried on the synopsis determination to the intermediary product.
Draws the main conclusion to be as follows:
(1) Doping's TiO2 to the active black photochemical catalysis degradation reaction is the first-level response, active black degeneration decolorization speed constant k is approximate for the active black solution initial density.
(2) Had considered Fe, the Cu doping quantity, the calcining heat as well as the calcine time joint action to this catalyst active influence, and uses two return general revolving unitized design, obtains prepares this catalyst the optimum condition for the calcine time is 3.55h, the calcining heat for 453℃, the copper doping quantity is 1.89%, the hard doping quantity is 1.62%.
(3) Throws the increment along with catalyst TiO2 elevation, the active black degeneration rate increases gradually. But works as the catalyzed dosage to be excessively many, the active black degeneration rate starts to appear reduces the tendency.
(4) Doping few Fe and Cu can enhance the TiO2 photochemical catalysis activeness, but when mixes the quantity is big, will then cause the TiO2 photochemical catalysis activeness to reduce.
(5) Under the impulsive discharge condition, dopes TiO2 to compare does not add the catalyst and does not dope TiO2 the degeneration effect to be friends with.
(6) The Spectral analysis of black under TiO2 degeneration indicated that catalyst TiO2 can degrade the active black solution under the impulsive discharge and cause it to decolorize completely, azo structure, benzene ring and fused ring disarrangement of the structure decomposition.
引文
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