Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China; Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China; Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
J Hazard Mater. 2018 Sep 15;358:53-61. doi: 10.1016/j.jhazmat.2018.06.048. Epub 2018 Jun 23.
In this study, porous carbon aerogel (CA) was synthesized with D-glucose, ammonium persulfate and aniline by a hydrothermal carbonization method. It was reported for the first time as an excellent catalyst for activating persulfate (PS) to degrade rhodamine B (RhB). The morphology of CA was characterized, exhibiting microporous and mesoporous structures. The solution pH of 3, 5, 7 and 9 showed slight impact on the degradation of RhB; however, when the pH increased to 11, the removal of RhB decreased. The PS concentration and CA dosage played a key role in the RhB degradation, and the activation energy was calculated to be 22.11 kJ/mol. Electron paramagnetic resonance (EPR) spectra suggested that neither sulfate radical (SO4) nor hydroxyl radical (OH) was generated from the PS activation. The radical quenching experiments also confirmed that CA activated PS in a non-radical pathway. It was indicated that PS bonded with CC in the sp hybridized system could directly degrade RhB. The defective edges at the boundary of CA also facilitated the RhB removal. This work presented a green material with both excellent catalytic performance and high regeneration possibility in the heterogeneous metal-free PS activation, providing a new strategy in water treatment.
在这项研究中，通过水热碳化法，以 D-葡萄糖、过硫酸铵和苯胺合成了多孔碳气凝胶（CA）。它首次被报道为一种用于激活过硫酸盐（PS）以降解罗丹明 B（RhB）的优异催化剂。CA 的形态学特征为具有微孔和中孔结构。溶液 pH 值为 3、5、7 和 9 时，对 RhB 的降解影响较小；然而，当 pH 值增加到 11 时，RhB 的去除率降低。PS 浓度和 CA 用量在 RhB 降解中起着关键作用，计算得出的活化能为 22.11 kJ/mol。电子顺磁共振（EPR）谱表明，PS 活化过程中既没有生成硫酸根自由基（SO4）也没有生成羟基自由基（OH）。自由基猝灭实验也证实 CA 在非自由基途径中激活了 PS。结果表明，PS 与 sp 杂化体系中的 CC 键合可以直接降解 RhB。CA 边界处的缺陷边缘也有利于 RhB 的去除。这项工作提供了一种在非均相无金属 PS 活化中具有优异催化性能和高再生可能性的绿色材料，为水处理提供了一种新策略。
