Tuong Vy Ngo Thi, Nha Khanh Dang Nguyen, Nghia Nguyen Ngoc, Khoa Le Hai, Nhi Pham Tuan, Hung Le Xuan, Minh Phuong Doan Thi, Kim Phuong Nguyen Thi
Institute of Applied Materials Science, Vietnam Academy of Science and Technology, Ho Chi Minh 700000, Vietnam.
Vietnam Academy of Science and Technology, Graduate University of Science and Technology, Hanoi 100000, Vietnam.
Materials (Basel). 2023 Jul 16;16(14):5027. doi: 10.3390/ma16145027.
A superior heterojunction of HC-ZnBi-LDO was synthesized in two steps, namely hydrothermal carbonization, followed by co-precipitation. The 2% HC-ZnBi-LDO heterojunction photocatalysts could degrade over 90.8% of 30 mg/L 2,4-dichlorophenoxyacetic acid (2,4-D) using 1.0 g/L of the catalyst after 135 min of visible light exposure at pH 4. The activity of 2% HC-ZnO-LDO was remarkably stable. Approximately 86.4-90.8% of 30 mg/L 2,4-D was degraded, and more than 79-86.4% of TOC was mineralized by 2% HC-ZnBi-LDO at pH 4 after 135 min of visible light exposure during four consecutive cycles. The rapid separation and migration of charge carriers at the interfaces between HC and ZnBi-LDO were achieved within 2% HC-ZnBi-LDO. Moreover, the electron acceptor characteristic of HC in 2% HC-ZnBi-LDO caused the recombination of charge carriers to decrease significantly, thus generating more reactive radicals, such as hydroxyl radicals (OH) and superoxide radicals (O). These results demonstrate that the novel 2% HC-ZnBi-LDO is a superior photocatalyst for the remediation of hazardous organic pollutants.
通过两步合成了一种性能优异的HC-ZnBi-LDO异质结，即水热碳化，然后进行共沉淀。在pH值为4的条件下，使用1.0 g/L的2% HC-ZnBi-LDO异质结光催化剂，在可见光照射135分钟后，可降解90.8%以上的30 mg/L 2,4-二氯苯氧乙酸（2,4-D）。2% HC-ZnO-LDO的活性非常稳定。在连续四个循环中，在pH值为4的条件下，可见光照射135分钟后，2% HC-ZnBi-LDO可降解约86.4-90.8%的30 mg/L 2,4-D，矿化79-86.4%以上的总有机碳（TOC）。在2% HC-ZnBi-LDO中实现了电荷载流子在HC和ZnBi-LDO界面之间的快速分离和迁移。此外，2% HC-ZnBi-LDO中HC的电子受体特性导致电荷载流子的复合显著减少，从而产生更多的活性自由基，如羟基自由基（OH）和超氧自由基（O）。这些结果表明，新型的2% HC-ZnBi-LDO是一种用于修复有害有机污染物的优异光催化剂。
