Xu Xi, Mao Chenyue, Song Jiannan, Ke Senhua, Hu Yongming, Chen Wanping, Pan Chunxu
Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan 430072, China.
Hubei Key Laboratory of Micro-Nanoelectronic Materials and Devices, School of Microelectronics, Hubei University, Wuhan 430062, China.
Materials (Basel). 2024 Jul 14;17(14):3487. doi: 10.3390/ma17143487.
GaN is more stable than most metal oxide semiconductors for the photocatalytic degradation of organic pollutants in harsh conditions, while its catalytic efficiency has been difficult to be substantially improved. In this study, the tribocatalytic degradation of organic dyes by GaN nanoparticles has been investigated. Stimulated through magnetic stirring using homemade Teflon magnetic rotary disks in glass beakers, the GaN nanoparticles were found to induce negligible degradation in rhodamine B (RhB) and methyl orange (MO) solutions. Surprisingly, the degradation was greatly enhanced in beakers with Ti and AlO coatings on their bottoms: 99.2% and 99.8% of the 20 mg/L RhB solutions were degraded in 3 h for the Ti and AlO coatings, respectively, and 56% and 60.2% of the 20 mg/L MO solutions were degraded in 24 h for the Ti and AlO coatings, respectively. Moreover, the MO molecules were only broken into smaller organic molecules for the Ti coating, while they were completely degraded for the AlO coating. These findings are important for the catalytic degradation of organic pollutants by GaN in harsh environments and for achieving a better understanding of tribocatalysis as well.
在苛刻条件下，氮化镓（GaN）对于光催化降解有机污染物而言比大多数金属氧化物半导体更稳定，然而其催化效率却一直难以得到大幅提高。在本研究中，对氮化镓纳米颗粒的摩擦催化降解有机染料进行了研究。通过在玻璃烧杯中使用自制的聚四氟乙烯磁性旋转盘进行磁力搅拌来激发，发现氮化镓纳米颗粒在罗丹明B（RhB）和甲基橙（MO）溶液中引起的降解可忽略不计。令人惊讶的是，在底部有钛（Ti）和氧化铝（AlO）涂层的烧杯中，降解显著增强：对于Ti和AlO涂层，在3小时内分别有99.2%和99.8%的20mg/L RhB溶液被降解，在24小时内分别有56%和60.2%的20mg/L MO溶液被Ti和AlO涂层降解。此外，对于Ti涂层，MO分子仅分解为较小的有机分子，而对于AlO涂层，它们被完全降解。这些发现对于氮化镓在恶劣环境中催化降解有机污染物以及更好地理解摩擦催化都很重要。
