分子识别作用下光催化降解偶氮染料酸性红GR

合成了β-环糊精(β-CD)与偶氮染料酸性红GR(ARGR)的包结物,并采用红外光谱仪对ARGR、β-CD及β-CD与ARGR的包结物进行了表征,表征结果显示,β-CD与ARGR的包结物的特征峰的峰形和强度与β-CD相似,但峰位有明显的偏移,说明ARGR进入了β-CD空腔与β-CD发生了分子识别作用。采用TiO2作为催化剂,研究了β-CD分子识别后ARGR的光催化降解行为,实验结果表明,在ARGR质量浓度为20.0 mg/L、β-CD浓度为1.8×10-5 mol/L、体系pH为4.0、TiO2加入量为1.0 g/L、光催化反应时间为60 min的条件下,经β-CD分子识别后ARGR的光催化降解率可达100%。

Photocatalyticdegradation of azo dye Acid Red GR based on molecular recognitionQI

The inclusion complex of β-cyclodextrin（β-CD）and azo dye Acid Red GR （ARGR）was synthesized. ARGR，β-CD and the inclusion complex were characterized by FTIR，and the results show that the peak and strength of the characteristic peak of the inclusion complex of β-CD and ARGR are similar to those of β-CD，but there is a significant shift in the peak position，which indicates that ARGR entered the β-CD cavity and had molecular recognition with β-CD. The photocatalytic degradation behavior of ARGR after β-CD molecular recognition was studied using TiO₂ as a catalyst. The experimental results show that under the conditions of ARGR mass concentration 20.0 mg/L，β-CD concentration 1.8×10_-5 mol/L，system pH 4.0，TiO₂ amount 1.0 g/L and photocatalytic reaction time 60 min，the photodegradation rate of ARGR can reach 100 % because of the β-CD molecular recognition interaction.