Details

Autor(en) / Beteiligte

• Zhou, Shaojie
• Hu, Anfu
• Jiang, Jian
• Tang, Jiaqi
• Zhou, Guojun
• Zhu, Lingjun
• Wang, Shurong

Titel

Low-temperature synthesized hierarchical porous carbon from waste hydrochar with super capacity for dye adsorption

Ist Teil von

• Biomass & bioenergy, 2023-10, Vol.177, p.106938, Article 106938

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Hydrochar is a by-product of subcritical hydrothermal conversion of biomass for bio-oil production, which has received more and more attention in environmental remediation, but the low porosity of hydrochar severely limits its effective utilization. Herein, a novel method of low-temperature activation of hydrochar with sodium amide (NaNH2) was proposed to enhance its porosity. The resulting hydrochar-derived porous carbon (PC) possessed a large pore volume (1.147 cm3/g) and a high specific surface area of up to 2185.3 m2/g. Further, NaNH2 also increased the relative oxygen content of PC during activation. 2D-FTIR correlation spectra suggested that the change in the infrared signal intensity of -C-O ordinarily occurred before that of aromatic CC as the NaNH2 dosage changed. More importantly, as-prepared PC exhibited excellent adsorption properties for methylene blue (MB), up to 833.33 mg/g, which is mainly attributed to the pore-filling-effect. And the oxygen-containing functional group was also beneficial to improve the adsorption capacity of PC for MB. The adsorption process of MB on as-prepared PC was well described using the Langmuir adsorption isotherm model, indicating that the adsorption process was single-layer adsorption. Undoubtedly, it is a feasible strategy to prepare PC for MB adsorption by low-temperature activation of waste hydrochar with NaNH2. [Display omitted] •Hydrochar-derived porous carbons were synthesized by low-temperature activation.•NaNH2increased the porosity of hydrochar by etching and in-situ physical activation.•Porous carbon showed excellent adsorption capacity for methylene blue.•The adsorption mechanism was mainly attributed to the pore-filling-effect.