You Xueji, Dai Chaomeng, Wang Zeyu, Duan Yanping, Zhang Jun Bo, Lai Xiaoying, Hu Jiajun, Li Jixiang, Maimaitijiang Maisideke, Zhang Yalei, Liu Shuguang, Fu Rongbing
Department of Hydraulic Engineering, College of Civil Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, China.
Department of Hydraulic Engineering, College of Civil Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, China.
Chemosphere. 2023 Dec;345:140491. doi: 10.1016/j.chemosphere.2023.140491. Epub 2023 Oct 18.
Polycyclic aromatic hydrocarbons (PAHs) in aquatic environments are threatening ecosystems and human health. In this work, an effective and environmentally friendly catalyst based on biochar and molecular imprinting technology (MIT) was developed for the targeted degradation of PAHs by activating peroxymonosulfate. The results show that the adsorption amount of naphthalene (NAP) by molecularly imprinted biochar (MIP@BC) can reach 82% of the equilibrium adsorption capacity within 5 min, and it had well targeted adsorption for NAP in the solution mixture of NAP, QL and SMX. According to the comparison between the removal rates of NAP and QL by MIP@BC/PMS or BC/PMS system in respective pure solutions or mixed solutions, the MIP@BC/PMS system can better resist the interference of competing pollutants (i.e., QL) compared to the BC/PMS system; that is, MIP@BC had a good ability to selectively degrade NAP. Besides, the removal rate of NAP by MIP@BC/PMS gradually decreased as pH increased. The addition of Cl greatly promoted the targeted removal of NAP in the MIP@BC/PMS system, while HCO and CO both had an inhibitory effect. Furthermore, SO, O and O produced by BC activating PMS dominated the NAP degradation, and it was inferred that the vacated imprinted cavities after NAP degradation can continue to selectively adsorb NAP and this could facilitate the reusability of the material. This study can promote the research on the targeted degradation of PAHs through the synergism of biochar/PMS advanced oxidation processes and MIT.
水生环境中的多环芳烃（PAHs）正威胁着生态系统和人类健康。在这项工作中，基于生物炭和分子印迹技术（MIT）开发了一种有效且环境友好的催化剂，用于通过活化过一硫酸盐来靶向降解PAHs。结果表明，分子印迹生物炭（MIP@BC）对萘（NAP）的吸附量在5分钟内可达到平衡吸附容量的82%，并且它对NAP、QL和SMX混合溶液中的NAP具有良好的靶向吸附作用。根据MIP@BC/PMS或BC/PMS体系在各自纯溶液或混合溶液中对NAP和QL的去除率比较，与BC/PMS体系相比，MIP@BC/PMS体系能更好地抵抗竞争性污染物（即QL）的干扰；也就是说，MIP@BC具有良好的选择性降解NAP的能力。此外，MIP@BC/PMS对NAP的去除率随pH升高而逐渐降低。Cl的添加极大地促进了MIP@BC/PMS体系中NAP的靶向去除，而HCO和CO均具有抑制作用。此外，BC活化PMS产生的SO、O和O主导了NAP的降解，并且据推测，NAP降解后空出的印迹空腔可以继续选择性吸附NAP，这有利于材料的可重复使用性。本研究可推动通过生物炭/PMS高级氧化过程与MIT的协同作用对PAHs进行靶向降解的研究。
