School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China.
School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China; Jiangsu Engineering Research Center of Biomass Waste Pyrolytic Carbonization & Application, Yancheng 224051, China.
J Environ Manage. 2023 Mar 1;329:117049. doi: 10.1016/j.jenvman.2022.117049. Epub 2022 Dec 21.
N-doping for the preparation of functional carbon materials is a trending research topic. In this study, N-rich biochar (BC) was prepared by calcining naturally N rich shrimp shells under oxygen-limiting environment, and the calcining temperatures were controlled. BC were activated with 5% hydrochloric acid solutions and then post-modified with ball-milling to obtain a series of novel adsorbents (MBCs). All samples were characterized by SEM, BET, FT-IR, XRD, XPS, TG, and element analysis. Surface area, pore volume, and other surface functional groups were significantly improved after acidizing and ball-milling. The adsorption capacities for MB were MBC350 > MBC500 > MBC650 >BC350 > BC650 > BC500, and the equilibrium adsorption capacities were 575.01 mg/g, 506.52 mg/g, 424.59 mg/g, 113.31 mg/g, 93.53 mg/g and 86.25 mg/g, respectively. The excellent adsorption performance of MBCs for MB was ascribed to Lewis acid-base interaction, π-π interaction, electrostatic interaction and van der Waals, and the quinone group and pyridinic-N on the surface of the MBCs are identified as the major active sites. Taken together, ball-milled shrimp shell biochar is a promising material for cation dye adsorption.
N 掺杂制备功能碳材料是一个热门的研究课题。在这项研究中，通过在缺氧环境下煅烧天然富氮虾壳来制备富氮生物炭（BC），并控制煅烧温度。用 5%盐酸溶液对 BC 进行活化，然后通过球磨进行后修饰，得到一系列新型吸附剂（MBCs）。所有样品均通过 SEM、BET、FT-IR、XRD、XPS、TG 和元素分析进行了表征。酸化和球磨后，比表面积、孔体积和其他表面官能团显著提高。对 MB 的吸附容量为 MBC350 > MBC500 > MBC650 > BC350 > BC650 > BC500，平衡吸附容量分别为 575.01 mg/g、506.52 mg/g、424.59 mg/g、113.31 mg/g、93.53 mg/g 和 86.25 mg/g。MBCs 对 MB 的优异吸附性能归因于路易斯酸碱相互作用、π-π 相互作用、静电相互作用和范德华力，并且 MBCs 表面的醌基和吡啶-N 被确定为主要的活性位。综上所述，球磨虾壳生物炭是一种有前途的阳离子染料吸附材料。
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