School of Chemical Engineering, Xiangtan University, Xiangtan 411105, China.
Department of Chemical Engineering, Imperial College London, London SW7 2AZ, United Kingdom.
Bioresour Technol. 2020 May;303:122939. doi: 10.1016/j.biortech.2020.122939. Epub 2020 Jan 31.
N-doped carbons were obtained from bamboo shoot shell via hydrothermal pretreatment under salt assistance followed by carbonization, using melamine as nitrogen source. The carbons with tubular morphology and surface areas in 406-489 m/g range were used as adsorbents for the removal of methyl orange (MO) and rhodamine B (RhB). Adsorption isotherms and kinetic fitting showed much better accordance with Freundlich model and pseudo-second-order, showing balanced capacity (q) of 50 mg/g for MO and 42 mg/g for RhB on the pristine carbons (BHC-800) at 25 °C. After N-doping treatment, carbons (BSC-M20) had q of MO and RhB up to 140 and 100 mg/g, respectively, confirming a positive effect of N-doping on the enhancement of dyes removal. The findings indicated that hydrothermal treatment followed by carbonization was efficient to obtain N-doped carbons from biomass materials, and the present BSS-derived carbons were promising adsorbents for organic dyes removal from water.
氮掺杂碳是通过水热预处理在盐辅助下，以竹壳为原料，三聚氰胺为氮源，碳化得到的。具有管状形态和 406-489 m²/g 范围内表面积的碳被用作吸附剂，用于去除甲基橙（MO）和罗丹明 B（RhB）。吸附等温线和动力学拟合更符合弗伦德利希模型和拟二级动力学模型，表明在 25°C 下，原始碳（BHC-800）对 MO 和 RhB 的平衡容量（q）分别为 50 和 42 mg/g。经过氮掺杂处理后，碳（BSC-M20）对 MO 和 RhB 的吸附容量分别高达 140 和 100 mg/g，证实了氮掺杂对增强染料去除的积极影响。研究结果表明，水热预处理后碳化是从生物质材料中获得氮掺杂碳的有效方法，而本研究中 BSC 衍生的碳是去除水中有机染料的有前途的吸附剂。
