School of Chemistry and Chemical Engineering, Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Guangxi University, 100 Daxuedong Road, Nanning 530004, China.
School of Chemistry and Chemical Engineering, Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Guangxi University, 100 Daxuedong Road, Nanning 530004, China.
Int J Biol Macromol. 2023 Jun 1;239:124303. doi: 10.1016/j.ijbiomac.2023.124303. Epub 2023 Apr 3.
A new N, S-CQDs@FeO@HTC composite was prepared by loading N, S carbon quantum dots (N, S-CQDs) derived from lignin on magnetic hydrotalcite (HTC) via an in-situ growth method. The characterization results showed that the catalyst had a mesoporous structure. These pores facilitate the diffusion and mass transfer of pollutant molecules inside the catalyst, allowing them to approach the active site smoothly. The catalyst performed well in the UV degradation of Congo red (CR) over a wide pH range (3-11), with efficiencies over 95.43 % in all cases. Even at a high NaCl content (100 g/L), the catalyst showed extraordinary CR degradation (99.30 %). ESR analysis and free radical quenching experiments demonstrated that OH and O were the main active species governing CR degradation. Besides, the composite had outstanding removal efficiency for Cu (99.90 %) and Cd (85.08 %) simultaneously due to the electrostatic attraction between the HTC and metal ions. Moreover, the N, S-CQDs@FeO@HTC had excellent stability and recyclability during five cycles, making it free of secondary contamination. This work provides a new environment-friendly catalyst for the simultaneous removal of multiple pollutants and a waste-to-waste strategy for the value-added utilization of lignin.
采用原位生长法将木质素衍生的 N、S 碳量子点（N、S-CQDs）负载到磁性水滑石（HTC）上，制备了一种新型的 N、S-CQDs@FeO@HTC 复合材料。表征结果表明，催化剂具有介孔结构。这些孔有利于污染物分子在催化剂内部的扩散和传质，使它们能够顺利地接近活性位。该催化剂在很宽的 pH 范围（3-11）内对刚果红（CR）的 UV 降解表现出良好的性能，在所有情况下的效率均超过 95.43%。即使在高 NaCl 含量（100 g/L）下，催化剂对 CR 的降解也表现出非凡的效果（99.30%）。ESR 分析和自由基淬灭实验表明，OH 和 O 是降解 CR 的主要活性物质。此外，由于 HTC 和金属离子之间的静电吸引，该复合材料对 Cu（99.90%）和 Cd（85.08%）同时具有出色的去除效率。此外，在五个循环中，N、S-CQDs@FeO@HTC 具有出色的稳定性和可回收性，不会造成二次污染。这项工作为同时去除多种污染物提供了一种环保型催化剂，并为木质素的增值利用提供了一种废物转化为废物的策略。
