College of Biomass Science and Engineering, Sichuan University, Chengdu, 610065, China.
Graduate School of Energy Science, Kyoto University, Kyoto, Japan.
Environ Sci Pollut Res Int. 2024 Aug;31(39):51325-51343. doi: 10.1007/s11356-024-34564-4. Epub 2024 Aug 6.
In this study, a lignin-based aerogel (LA) was prepared through acid precipitation of BPBL, followed by sol-gel method and freeze-drying. Additionally, a one-step activation-carbonization method was used to acquire nitrogen-doped lignin-based activated carbon aerogel (NLACA). The adsorption and catalytic degradation performance for malachite green (MG) were examined. The specific surface area of NLACA after N-doping was 2644.5 m/g. The adsorption capacity for MG was increased to 3433 mg/g with the presence of nitrogenous functional groups on surface of NLACA compared without N-doping. Meanwhile, non-radical singlet oxygen is the primary active substance and degradation efficiency arrives at 91.8% after the catalytic degradation within 20 min and it has good stability and reuse. Three possible degradation pathways during degradation were analyzed by LC-MS technique. The adsorption isotherm and kinetic data demonstrated conformity with both the Langmuir model and the pseudo-second-order kinetic model. The primary mechanisms of the adsorption for MG dyes on NLACA include hydrogen bonding, π-π interactions, attraction of electrostatic and pore filling. Hence, NLACA derived from BPBL acts as a cost-effective and high-performance adsorbent and catalyst for removal of MG in dye wastewater. This concept introduces an innovative approach of "treatment of waste with waste" for developing a low-consumption, high-efficiency dye wastewater treatment and provides significant reference to treatment dye wastewater.
在这项研究中，通过 BPBL 的酸沉淀，随后采用溶胶-凝胶法和冷冻干燥法制备了一种木质素气凝胶（LA）。此外，还采用了一步活化碳化法获得了氮掺杂木质素基活性炭气凝胶（NLACA）。考察了其对孔雀石绿（MG）的吸附和催化降解性能。N 掺杂后 NLACA 的比表面积增加到 2644.5 m/g。与未掺杂 N 的 NLACA 相比，表面含氮官能团的 NLACA 对 MG 的吸附容量增加到 3433 mg/g。同时，单线态氧是非自由基活性物质，在 20 min 内催化降解后降解效率达到 91.8%，具有良好的稳定性和可重复使用性。通过 LC-MS 技术分析了三种可能的降解途径。吸附等温线和动力学数据表明，吸附符合 Langmuir 模型和拟二级动力学模型。MG 染料在 NLACA 上的吸附主要机制包括氢键、π-π相互作用、静电吸引和孔填充。因此，源自 BPBL 的 NLACA 是一种具有成本效益和高性能的吸附剂和催化剂，可用于去除染料废水中的 MG。该概念为开发低消耗、高效率的染料废水处理提供了一种创新的“以废治废”方法，为处理染料废水提供了重要参考。
