Zhang Qiyun, Chen Shunda, Chen Haobin, Hu Yixiao, Lin Qilang
College of Advanced Manufacturing, Fuzhou University, Jinjiang, 362251, PR China.
College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350116, PR China.
Environ Res. 2025 Feb 15;267:120702. doi: 10.1016/j.envres.2024.120702. Epub 2024 Dec 26.
This work developed a novel oxidized hierarchical porous carbon (OHPC) with vesicule-like ultrathin graphitic walls via a method of air oxidation and used as an efficient adsorbent for Congo red (CR) and Malachite green (MG) removal. Results show that the OHPC2 oxidized at 400 °C possesses three-dimensional hierarchical pores with vesicule-like ultrathin graphitic walls. The prepared OHPC2 not only has a large specific surface area of 1020 m g with a high pore volume, but also has abundant oxygen-containing functional groups. These unique structural features endow the OHPC2 with high adsorption capacities for CR (2729.5 mg g) and MG (1697.3 mg g) removal. The adsorption processes of CR and MG are in accordance with the Langmuir isotherm and Quasi-second-order kinetic models. The thermodynamic studies illustrate that the adsorption processes were thermodynamically feasible and spontaneous. Various characterization analysis explained that the adsorption mechanism may involve pore-filling effect, π-π conjugation, hydrogen bonding, and electrostatic attraction. Moreover, the OHPC2 exhibits good cycling stability and is identified as a desirable adsorbent for actual wastewater treatment.
本研究通过空气氧化法制备了一种具有囊泡状超薄石墨壁的新型氧化分级多孔碳（OHPC），并将其用作去除刚果红（CR）和孔雀石绿（MG）的高效吸附剂。结果表明，在400℃下氧化的OHPC2具有三维分级孔结构和囊泡状超薄石墨壁。制备的OHPC2不仅具有1020 m²/g的大比表面积和高孔容，还含有丰富的含氧官能团。这些独特的结构特征赋予了OHPC2对CR（2729.5 mg/g）和MG（1697.3 mg/g）的高吸附容量。CR和MG的吸附过程符合朗缪尔等温线和准二级动力学模型。热力学研究表明，吸附过程在热力学上是可行的且是自发的。各种表征分析表明，吸附机制可能涉及孔填充效应、π-π共轭、氢键和静电吸引。此外，OHPC2表现出良好的循环稳定性，被认为是实际废水处理的理想吸附剂。
