Photocatalytic Degradation of 4-Chlorophenol by Gd-Doped β-Bi2O3 Under Visible Light Irradiation

• 来源期刊: 高等学校化学研究（英文版）
• 年，卷（期）: 2019,（1）
• 页码范围: 120-124
• 页数: 5页
• 语种: 英文
• DOI: 10.1007/s40242-018-8170-6

摘要

Chlorophenols are known as persistent organic pollutants.Therefore,research on the removal of chlorophenols has attracted widespread attention.Herein,the photocatalytic degradation of 4-chlorophenol by Gd-doped β-Bi2O3 under visible light irradiation was studied.The results showed that Gd-doped β-Bi2O3 materials are efficient catalysts for the photocatalytic degradation of chlorophenols,and 2％(atomic fraction) Gd-doped β-Bi2O3 exhibits the highest photocatalytic activity for 4-chlorophenol degradation,because doping an appropriate amount of Gd3+ ions can effectively reduce the recombination rate of the photogenerated e-/h+ pairs and then enhance the photocatalytic performance.When the reaction was carried out at 25 ℃ for 6 h using the 2％ Gd-doped β-Bi2O3 micro/nano materials of 200 mg and at air flow rate of 40 mL/min,the degradation rate of 4-chlorophenol reached 92.3％.Additionally,based on the analysis of the products,it was speculated that the dominant photocatalytic degradation mechanism of 4-chlorophenol by Gd-doped β-Bi2O3 under visible light irradiation is an oxidative process involving an attack by the hydroxyl radical.