Du Li, Xu Weihua, Liu Shaobo, Li Xin, Huang Danlian, Tan Xiaofei, Liu Yunguo
College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, China.
J Colloid Interface Sci. 2020 Oct 1;577:419-430. doi: 10.1016/j.jcis.2020.05.096. Epub 2020 May 27.
Recently, the application of cheap, easily available biochar (BC) in advanced oxidation processes (AOPs) has received widespread attention. However, it is still a challenge to seek effective modification methods to prepare BC with high catalytic performance. In this study, a novel and environmentally friendly graphitized BC (WGBC) derived from wood chip was prepared, which exhibited excellent performance towards persulfate (PS) activation for sulfamethoxazole (SMX) removal as compared to original BC. Series characterizations confirmed that such improved catalytic performance was attributed to the well-established graphitic carbon structure and surface functionalized CO group. Free radical quenching and electron paramagnetic resonance (EPR) experiments qualitatively demonstrated that SO, ·OH, O and O were involved in the degradation of SMX, of which O and O played the dominant roles. Moreover, a non-radical process in the WGBC/PS system was also proposed, in which WGBC worked as an electron transfer bridge for allowing electrons to transfer from SMX to PS to participate in SMX degradation. The WGBC/PS system exhibited a high anti-interference ability to Cl, HPO, NO, and humic acid (HA)-containing environments. This study provides a new idea for designing and constructing environmentally friendly and efficient biochar towards organic pollutants removal.
近年来，廉价易得的生物炭（BC）在高级氧化工艺（AOPs）中的应用受到广泛关注。然而，寻求有效的改性方法来制备具有高催化性能的BC仍然是一项挑战。在本研究中，制备了一种新型且环保的由木屑衍生的石墨化BC（WGBC），与原始BC相比，其在活化过硫酸盐（PS）以去除磺胺甲恶唑（SMX）方面表现出优异性能。系列表征证实，这种催化性能的提高归因于良好的石墨碳结构和表面官能化的羰基。自由基淬灭和电子顺磁共振（EPR）实验定性表明，SO、·OH、O和O参与了SMX的降解，其中O和O起主导作用。此外，还提出了WGBC/PS体系中的非自由基过程，其中WGBC作为电子转移桥，使电子从SMX转移到PS以参与SMX降解。WGBC/PS体系对含Cl、HPO、NO和腐殖酸（HA）的环境表现出高抗干扰能力。本研究为设计和构建用于去除有机污染物的环保高效生物炭提供了新思路。
