Self-Activating Approach for Synthesis of 2,6-Naphthalene Disulfonate Acid Disodium Salt-Derived Porous Carbon and CO<sub>2</sub> Capture Performance
Tingyan Lu, Jiali Bai, Jiamei Huang, Qiyun Yu, Müslüm Demir, Murat Kılıç, Bilge Nazli Altay, Linlin Wang, Xin Hu
Abstract
Porous carbon is considered an effective adsorbent for CO 2 uptake thanks to its high textural feature, tunable surface decoration, and stable chemical/physical characteristics. Herein, a one-pot self-activating synthesis approach has been introduced to fabricate disodium 2,6-naphthalene disulfonate (NDS)-derived self-S-doped porous carbon. With this method, there is no external chemical activating agents for the activation process, and the self-activating process occurs by releasing CO, H 2 O, and CO 2 gases during pyrolysis treatment. It was found that activating temperatures can carefully control the porous textural and elemental compositions of the as-prepared carbons. Upon the activating process, the optimal S-doped porous carbon was prepared at 700 °C, providing CO 2 uptake capacities of 2.36 and 3.56 mmol/g at 25 and 0 °C and 1 bar, respectively. An in-depth investigation indicates that the joint effect of narrow microporosity and S content determines the CO 2 uptake for this series of carbons. In addition, these NDS-derived self-S-doped porous carbons exhibit moderate CO 2 heats of adsorption, fast adsorption kinetics, reasonable CO 2 /N 2 selectivities, good dynamic CO 2 capture capacities, and stable recyclabilities. The presented synthesis method is promising for fabricating facile carbon-based adsorbents from various organic precursors.