Ying Wanying, Liu Qing, Jin Xinyan, Ding Guanzhi, Liu Mengyu, Wang Pengyu, Chen Shuoping
College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China.
Nanomaterials (Basel). 2023 Sep 6;13(18):2506. doi: 10.3390/nano13182506.
To provide an economical magnetic photocatalyst and introduce an innovative approach for efficiently utilizing discarded waste rice noodle (WRN) and iron oxide scale (IOS), we initially converted WRN into carbon quantum dots (CQDs) using a hydrothermal method, simultaneously calcining IOS to obtain iron oxide (FeO). Subsequently, we successfully synthesized a cost-effective, magnetic CQDs/FeO photocatalytic composite for the first time by combining the resulting CQDs and FeO. Our findings demonstrated that calcining IOS in an air atmosphere enhanced the content of photocatalytically active α-FeO, while incorporating WRN-based CQDs into FeO improved the electron-hole pair separation, resulting in increased O reduction and HO oxidation. Under optimized conditions (IOS calcination temperature: 300 °C; carbon loading: 11 wt%), the CQDs/FeO composite, utilizing WRN and IOS as its foundation, exhibited exceptional and reusable capabilities in photodegrading methylene blue and tetracycline. Remarkably, for methylene blue, it achieved an impressive degradation rate of 99.30% within 480 min, accompanied by a high degradation rate constant of 5.26 × 10 min. This composite demonstrated reusability potential for up to ten photocatalytic cycles without a significant reduction in the degradation efficiency, surpassing the performance of IOS and FeO without CQDs. Notably, the composite exhibited strong magnetism with a saturation magnetization strength of 34.7 emu/g, which enables efficient and convenient recovery in photocatalytic applications. This characteristic is highly advantageous for the large-scale industrial utilization of photocatalytic water purification.
为了提供一种经济的磁性光催化剂，并引入一种有效利用废弃米线（WRN）和氧化铁鳞片（IOS）的创新方法，我们首先采用水热法将WRN转化为碳量子点（CQD），同时煅烧IOS以获得氧化铁（FeO）。随后，我们首次通过将所得的CQD和FeO结合，成功合成了一种具有成本效益的磁性CQD/FeO光催化复合材料。我们的研究结果表明，在空气气氛中煅烧IOS可提高光催化活性α-FeO的含量，而将基于WRN的CQD掺入FeO中可改善电子-空穴对的分离，从而增加O还原和HO氧化。在优化条件下（IOS煅烧温度：300°C；碳负载量：11 wt%），以WRN和IOS为基础的CQD/FeO复合材料在光降解亚甲基蓝和四环素方面表现出优异的可重复使用能力。值得注意的是，对于亚甲基蓝，它在480分钟内实现了高达99.30%的降解率，伴随着5.26×10 min的高降解速率常数。这种复合材料在多达十个光催化循环中表现出可重复使用的潜力，且降解效率没有显著降低，超过了不含CQD 的IOS和FeO的性能。值得注意的是，该复合材料表现出强磁性，饱和磁化强度为34.7 emu/g，这使得在光催化应用中能够高效、方便地回收。这一特性对于光催化水净化的大规模工业应用非常有利。
