Zhou Qiying, Jiang Xia, Li Xi, Jia Charles Qiang, Jiang Wenju
College of Architecture and Environment, Sichuan University Chengdu 610065 China
National Engineering Research Centre for Flue Gas Desulfurization Chengdu 610065 China.
RSC Adv. 2018 Aug 28;8(53):30171-30179. doi: 10.1039/c8ra05714a. eCollection 2018 Aug 24.
Novel biochar was prepared from plant-based biomass by the addition of nitrogen-containing phosphates (NCPs), including ammonia phosphate (AP), ammonia polyphosphate (APP) and urea phosphate (UP). The results demonstrated that with the addition of NCPs, the yield of biochar could be significantly increased from about 30% to up to about 60%. The pore structure of the biochar was significantly improved, and the AP-prepared biochar obtained a higher and of 798 m g and 0.464 cm g, respectively. Moreover, the surface chemistry of the NCP-prepared biochar was affected, and N heteroatoms could be successfully doped on the surface of biochar, up to 4.16%. Furthermore, through TG-FTIR and XPS analysis, some possible interactions between plant-based biomass and NCPs during the pyrolysis process were proposed to explore the mechanisms of the preparation process, including the P route and N route, in which the HPO and NH gradually generated during the heating process played the dominant roles for the high yield N-doped biochar. All the NCP-prepared biochar presented good toluene adsorption capacities from 175.9 to 496.2 mg g, which were significantly higher than that of blank char (6.5 mg g).
通过添加含氮磷酸盐（NCPs），包括磷酸铵（AP）、聚磷酸铵（APP）和磷酸脲（UP），从植物基生物质中制备了新型生物炭。结果表明，添加NCPs后，生物炭的产率可从约30%显著提高至约60%。生物炭的孔隙结构得到显著改善，用AP制备的生物炭的比表面积和孔容分别达到798 m²/g和0.464 cm³/g。此外，NCPs制备的生物炭的表面化学性质受到影响，N杂原子可成功掺杂在生物炭表面，掺杂量高达4.16%。此外，通过TG-FTIR和XPS分析，提出了植物基生物质与NCPs在热解过程中一些可能的相互作用，以探索制备过程的机理，包括P途径和N途径，其中加热过程中逐渐生成的HPO和NH对高产率氮掺杂生物炭起主导作用。所有NCPs制备的生物炭对甲苯的吸附容量在175.9至496.2 mg/g之间，显著高于空白炭（6.5 mg/g）。
