纳米颗粒
降级(电信)
磁性纳米粒子
纳米材料
罗丹明B
环境修复
化学工程
材料科学
氧化铁纳米粒子
亚甲蓝
污染物
电子顺磁共振
光化学
纳米技术
化学
光催化
催化作用
有机化学
污染
核磁共振
生态学
工程类
物理
生物
电信
计算机科学
作者
Xiaodong Cui,Pengcheng Li,Hua Lee,Chang Tu,Dongliang Wang,Zhu Wang,Wanping Chen
标识
DOI:10.1016/j.seppur.2022.120814
摘要
Many piezoelectric nanomaterials have recently been revealed an attractive capability to degrade organic pollutants through utilizing mechanical energy via a tribocatalytic mechanism. Presently we have explored tribocatalytic degradation of organic pollutants for TiO2 nanoparticles. While degradation of organic dyes was observed for TiO2 nanoparticles under ordinary magnetic stirring, the degradation was greatly enhanced when the magnetic stirring was modified through using Teflon magnetic rotating disks, which are circular Teflon disks with a cross-shaped groove on one side and magnets mounted on the other side. With TiO2 nanoparticles under the modified magnetic stirring, as much as 99.7% of 40 mg/L Rhodamine B and 94.7% of 20 mg/L Methyl violet were degraded after 200 min, and 93.1% of 20 mg/L Methylene blue was degraded after 250 min, which are highly outstanding among catalytic dye degradations by metal oxide nanoparticles. Active radicals were detected through fluorescence spectroscopy and electron paramagnetic resonance spectroscopy for TiO2 nanoparticles under magnetic stirring, which supports a tribocatalytic mechanism for the dye degradations. These results suggest that tribocatalysis can be an appealing technology to utilize mechanical energy for environmental remediation, especially in areas of insufficient solar energy.
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