Facile fabrication of phenylenediamine residue derived N, O co-doped hierarchical hyperporous carbon for high-efficient chloroxylenol removal

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 433; p. 133635
• Main Authors: Yu, Wen-Long, Zhao, Shi-Lei, Xu, Guang-Wen, Li, Xin, Zhang, Xiao-Lei, Shan, Yu-Ling, Ding, Jun-Wei, Qin, Guo-Hui, Zhang, Jun-Mei, Feng, Xiang, Chen, De
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.04.2022
• Subjects: Adsorption; Chloroxylenol; DFT calculation; Hierarchical hyperporous carbon; N/O co-doped; Chloroxylenol; DFT calculation; N/O co-doped; Adsorption; Hierarchical hyperporous carbon
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2021.133635

[Display omitted] •Hierarchical hyperporous carbon (HHPC) was derived from phenylenediamine residue.•One-step “carbonization-casting-activation” strategy was used for HHPC synthesis.•The HHPC shows superior chloroxylenol adsorption capacity.•In-situ N/O co-dopped carbon surface enhances the adsorption of chloroxylenol. The chloroxylenol (PCMX) has shown well virucidal efficacy against COVID-19, but the large-scale utilization of which will undoubtedly pose extra environmental threaten. In the present study, the recycled industrial phenylenediamine residue was used and an integrated strategy of “carbonization-casting-activation” using super low-dose of activator and templates was established to achieve in-situ N/O co-doping and facile synthesis of a kind of hierarchical hyperporous carbons (HHPC). The sample of HHPC-1.25–0.5 obtained with activator and template to residue of 1.25 and 0.5 respectively shows super-high specific surface area of 3602 m2/g and volume of 2.81 cm3/g and demonstrates remarkable adsorption capacity of 1475 mg/g for PCMX in batch and of 1148 mg/g in dynamic column adsorption test. In addition, the HHPC-1.25–0.5 exhibits excellent reusability and tolerance for PCMX adsorption under various ionic backgrounds and real water matrix conditions. The combined physio-chemistry characterization, kinetic study and DFT calculation reveal that the enhanced high performances originate from the hierarchical pore structure and strong electrostatic interaction between PCMX and surface rich pyridinic-N and carbonyl groups.