TiO2-HNTs催化剂协同介质阻挡放电等离子体降解亚甲基蓝废水

为进一步提高介质阻挡放电等离子体（DBD）降解亚甲基蓝（MB）的效率，研究了采用介质阻挡放电等离子体和光催化剂协同技术。实验采用溶胶-凝胶法制备TiO₂-HNTs复合光催化材料，并利用XRD、FTIR、TGA方法对催化剂进行表征分析。考察了该材料的光催化性能，以及它与介质阻挡放电的联合降解过程中操作因素的影响，并对反应进行动力学研究。研究结果表明，TiO₂-HNTs复合光催化材料与介质阻挡放电产生协同作用，并能有效地提高MB的去除率，处理60min后，协同体系对MB的降解率为85.37%，MB的降解过程符合表观一级反应动力学方程。MB的去除率与MB的初始浓度，TiO₂-HNTs的投加量、煅烧温度、放电功率和通气量有关。当MB的初始浓度为100mg/L、TiO₂-HNTs的投加量为70mg/L、煅烧温度为300℃、放电功率为200W、通气量为200mL/min时，MB的去除效果较好。

Treatment of methylene blue wastewater with a compound photo-catalyst TiO2-HNTs combined with dielectric barrier discharge

In order to further improve methylene blue (MB) removal efficiency,a method of discharge plasma combined with photo-catalyst was adopted in this research. A compound photo-catalyst(TiO₂-HNTs) was made by a sol-gel process,which was characterized by XRD,FTIR and GTA. Photo-catalytic ability and influencing factors were tested. The kinetics of the reaction was studied. The results showed that TiO₂-HNTs has a synergetic effect when combined with dielectric barrier discharge,and significantly increases methylene blue removal rate. The removal rate of methylene blue was 85.37% after a 60 minutes reaction. The degradation of methylene blue is in accordance with the apparent pseudo-second-order. The degradation of methylene blue is influenced by many factors,including MB concentration,TiO₂-HNTs concentrations,calcination temperature,discharge power and air flow. The degradation is optimal when MB concentration is 100mg/L,TiO₂-HNTs concentrations is 70mg/L,calcination temperature is 300℃,discharge power is 200W and air flow is 200mL/min.