TiO_2/Ti转盘液膜反应器光电催化处理罗丹明B

Treatment of Rhodamine B solution using TiO_2/Ti rotating disk thin-film reactor

采用溶胶-凝胶法制备了TiO2/Ti电极,X射线衍射(XRD)分析表明,TiO2主要为锐钛矿,晶粒尺寸约为46nm。以TiO2/Ti电极作阳极,Cu电极作阴极,组装成转盘液膜反应器,考察了其光电催化处理染料罗丹明B(RhB)的影响因素(转盘转速、偏压、溶液初始pH、RhB初始浓度和电解质浓度)。得到最佳处理条件为:转盘转速90r/min,偏压0.4V,溶液初始pH 2.5,电解质(硫酸钠)质量浓度0.5g/L。在最佳处理条件下,处理20mg/L RhB染料废水90min的脱色率和总有机碳(TOC)去除率分别达到97.2%和72.7%。结果表明,由于同时强化了激发光源的利用率和溶液的传质效率,TiO2/Ti转盘液膜反应器可高效光电催化处理染料废水。

TiO2/Ti electrode was prepared by sol-gel method for photoelectrocatalysis treatment of the Rhodamine B（RhB） solution in a rotating disk thin-film reactor.X-ray diffraction（XRD） analysis showed the TiO2 photocatast was anatase with grain size of 46 nm.The effect of rotating speed,bias potential,initial pH,initial RhB concentration and supporting salt concentration on RhB degradation was investigated and the optimal treatment conditions were obtained as follow：rotating speed 90 r/min,bias potential 0.4 V,initial pH 2.5 and supporting salt concentration 0.5 g/L.Under these conditions,color and TOC removal efficiency of 20 mg/L RhB solution reached 97.2% and 72.7% respectively after 90 min treatment.The perfect performance of TiO2/Ti rotating disk thin-film reactor for RhB degradation could be attribute to its enhancement to light utilization efficiency and mass transfer velocity.