Abstract:

Nitrogen-doped TiO₂/Ti film electrodes(N-TiO₂/Ti) were prepared through sol-gel method using carbamide as nitrogen source. Results show N-TiO₂/Ti film electrode has the best performance when n(N):n(Ti)=0.84:1 and calcination temperature is 450 ℃ for 2.5 h. The dual slant-placed electrodes thin-film reactor was assembled,using the prepared N-TiO₂/Ti as photoanode and Cu as cathode,and the photocatalytic activity was evaluated by the degradation of Amaranth solution under visible irradiation. The decolourization efficiency of 20 mg/L Amaranth reached 90.1% for 120 min treatment under the optimal conditions of initial pH=2.50,circulating flux 85 mL/min and mass fraction of Na₂SO₄ 0.5 g/L. The reproducibility and repeatability of the N-TiO₂/Ti was investigated,results show the decolourization efficiency of 6 groups of parallel experiments for 60 min treatment was 78.1%±4.0%;The decolourization efficiency of the sixth cycle experiment for 60 min treatment decreased 7.9% compared to the first experiment.

Key words: sol-gel method, N-TiO₂/Ti film electrode, dual slant-placed electrodes thin-film reactor, photocatalytic

摘要：

以尿素为氮源,采用溶胶-凝胶法制备了N掺杂TiO₂膜电极(N-TiO₂/Ti),并优化了制备条件。结果表明,n(N):n(Ti)=0.84:1、经450 ℃煅烧2.5 h制得的膜电极光催化性能最佳;与Cu电极组装斜置双极液膜反应器,可见光下考察光催化反应的影响因素。得出最佳降解条件为:初始pH=2.50,废水流量为85 mL/min,Na₂SO₄质量浓度为0.5 g/L,此条件下处理20 mg/L苋菜红120 min,脱色率可达90.1%;膜电极的重现性与重复性结果表明,6片电极60 min的脱色率为78.1%±4.0%;一片电极经6次循环60 min脱色率比初次减少了7.9%。

关键词: 溶胶-凝胶法, N-TiO₂/Ti膜电极, 双极液膜反应器, 光催化

CLC Number: 

• X703.1