摘要
采用Pr(NO_(3))3·6H_(2)O、Gd(NO_(3))_(3)·6H_(2)O对纳米TiO_(2)进行稀土离子掺杂改性,制得Pr/TiO_(2)和Gd/TiO_(2)光催化剂,利用MB溶液模拟印染废水光催化降解实验,探讨了稀土掺杂改性纳米TiO_(2)对光催化活性的影响与最佳掺杂量。结果表明,掺杂Pr、Gd后,Pr/TiO_(2)和Gd/TiO_(2)的光吸收边带均出现红移现象,其能带宽度(E _(g))均接近3.0 eV,比未改性TiO_(2)的E_(g)降低了约7%,有效提高了光催化活性。在光催化降解实验中,当Pr和Gd掺杂量分别为1.0%和1.5%时,印染废水的降解效果最佳。Pr/TiO_(2)和Gd/TiO_(2)光催化剂在紫外光环境中的平衡降解率分别是未改性纳米TiO_(2)的1.45倍和1.64倍,在可见光环境中的平衡降解率分别是未改性纳米TiO_(2)的1.67倍和1.73倍,证明经稀土Pr、Gd离子掺杂改性纳米TiO_(2)的光催化活性显著提高。
The Pr/TiO_(2) and Gd/TiO_(2) photocatalysts were prepared by rare earth ion doping modification of nano-TiO_(2) using Pr(NO_(3))3·6H_(2)O and Gd(NO_(3))3·6H_(2)O.The MB solution was used to simulate the photocatalytic degradation of the printing and dyeing wastewater.The impact of rare earth-doped modified TiO_(2) on the photocatalytic activity and the optimal doping amount were investigated.The results show that the light absorption of Pr/TiO_(2) and Gd/TiO_(2) exhibited a red shift after doping with Pr and Gd,and the E_(g) decreased to about 3.0 eV,which was about 7%lower than that of unmodified TiO_(2),and the photocatalytic activities were effectively improved.In the photocatalytic degradation experiment,the best degradation effect of printing and dyeing wastewater was achieved when the Pr and Gd doping amounts were 1.0%and 1.5%,respectively.The equilibrium degradation rates of Pr/TiO_(2) and Gd/TiO_(2) photocatalysts were 1.45 times and 1.64 times higher than those of the pristine TiO_(2) under ultraviolet light,respectively.Meanwhile,under visible light,these rates were 1.67 times and 1.73 times higher than those of the pristine TiO_(2).These results indicate that the photocatalytic activities of rare earth Pr and Gd ions doped nano-TiO_(2) were significantly improved.
作者
何雪薇
周晟戎
李光照
贺攀
况文
任建
田德斌
韩锐
HE Xuewei;ZHOU Shengrong;LI Guangzhao;HE Pan;KUANG Wen;REN Jian;TIAN Debin;HAN Rui(Key Laboratory of Materials and Surface Technology(Ministry of Education),School of Materials Science and Engineering,Xihua University,Chengdu 610039,China;Sichuan Provincial Engineering Research Center of Functional Development and Application ofHigh Performance Special Textile Materials,Chengdu Textile College,Chengdu 611731,China)
出处
《功能材料》
北大核心
2025年第5期5135-5142,5166,共9页
Journal of Functional Materials
基金
四川大学高分子材料工程国家重点实验室开放课题(sklpme2018-4-22)
自然资源部离子型稀土资源与环境重点实验室开放基金项目(2022IRERE402)
西华大学重点科研基金项目(Z1620118)
成都市龙泉驿区科技计划项目(2022-34-7)
中国空气动力研究与发展中心超高速碰撞研究中心开放基金(20190102)。
关键词
稀土
离子掺杂
改性
纳米二氧化钛
光催化
rare earth
ion doping
doping modification
nano-TiO_(2)
photocatalysis
