Wang Qi, Han Liang, Wang Yutong, He Zhong, Meng Qingtong, Wang Shiqing, Xiao Ping, Jia Xilai
Huaneng Clean Energy Research Institute Beijing 102209 PR China
School of Materials Science and Engineering, University of Science and Technology Beijing Beijing 100083 PR China
RSC Adv. 2022 Jul 18;12(32):20640-20648. doi: 10.1039/d2ra03098e. eCollection 2022 Jul 14.
The large-scale burning of coal has led to increasingly serious SO environmental pollution problems. The SO adsorption and removal technology based on porous carbons has the advantages of less water consumption, no secondary pollution, recycling of pollutants, and renewable utilization of adsorbents, in contrast to the wet desulfurization process. In this work, we developed a series of N-doped coal-based porous carbons (NCPCs) by calcining a mixture of anthracite, MgO, KOH and carbamide at 800 °C. Among them, the NCPC-2 sample achieves a high N-doped amount of 1.29 at%, and suitable pores with a specific surface area of 1370 m g and pore volume of 0.62 cm g. This N-doped porous carbon exhibits excellent SO adsorption capacity as high as 115 mg g, which is 3.47 times that of commercial coal-based activated carbon, and 2 times that of NCPC-0 without N-doping. Theoretical calculations show that the active adsorption sites of SO are located at the edges and gaps of carbon materials, and surface N doping enhances the adsorption affinity of carbon materials for SO. In addition, the NCPCs prepared in this work are rich in raw materials and cheap, which meets the needs of industrial production, having excellent SO adsorption capacity.
大规模燃烧煤炭导致了日益严重的二氧化硫环境污染问题。与湿法脱硫工艺相比，基于多孔碳的二氧化硫吸附脱除技术具有用水量少、无二次污染、污染物可回收利用以及吸附剂可再生利用等优点。在这项工作中，我们通过在800℃下煅烧无烟煤、氧化镁、氢氧化钾和尿素的混合物，制备了一系列氮掺杂煤基多孔碳（NCPCs）。其中，NCPC-2样品实现了1.29 at%的高氮掺杂量，具有合适的孔隙结构，比表面积为1370 m²/g，孔容为0.62 cm³/g。这种氮掺杂多孔碳表现出高达115 mg/g的优异二氧化硫吸附容量，是商业煤基活性炭的3.47倍，是未掺杂氮的NCPC-0的2倍。理论计算表明，二氧化硫的活性吸附位点位于碳材料的边缘和间隙处，表面氮掺杂增强了碳材料对二氧化硫的吸附亲和力。此外，本工作制备的NCPCs原料丰富且价格低廉，满足工业生产需求，具有优异的二氧化硫吸附容量。
