Bo Xian,Wei Tang,Dongfang Xiang,Chenyang Rao,Xiaying Liu,Fang Fang,Fuhao Chu,Tao Fang
In this study, Microcystis aeruginosa was effectively transformed into high-surface-area biochar using four different organic potassium salts as activators, achieving a maximum specific surface area of 2933 m 2 ·g −1 . The resulting biochar exhibited an outstanding adsorption capacity for tetracycline hydrochloride, reaching up to 969.9 mg·g −1 . Our findings reveal that a higher potassium content in the precursor correlates with an increased surface area of the biochar, while lower self‑carbonization temperatures or higher melting points of the organic potassium salts promote a greater proportion of mesopores. Hydrogen bonding was identified as the primary adsorption mechanism, with density functional theory providing further insights into its significant role. This research presents a controllable, efficient, and environmentally friendly strategy for biochar activation and offers a predictive framework for optimizing biochar properties through organic potassium salt modification, laying a solid theoretical foundation for the design of advanced adsorbents with enhanced performance.
Hongmin Cui,Jinsong Shi,Jianguo Xu,Nanfu Yan,Yuewei Liu
In the current work, we proposed the use of two organic potassium salts, 4-morpholineethanesulfonic acid (MES) potassium salt and 1,4-piperazinediethanesulfonic acid (PIPES) dipotassium salt, as novel and tri-functional activators for the synthesis of N, S co-doped carbons (NSCDCs). The organic potassium salts served as activator and N/S source at the same time, allowing direct synthesis of NSCDCs with N/S free precursor. In order to verify this hypothesis, N,S free hydrochar derived from glucose was selected as the carbon source. NSCDCs with high and tunable surface area (1673–2235 m 2 /g), N content (3.44–5.80 wt%), and S content (5.26–8.72 wt%) were obtained. Physicochemical properties of the carbons were mainly decided by potassium salt and activation temperature. The NSCDCs were also investigated for their CO 2 adsorption properties. At 25 °C and 1 bar, high CO 2 uptake of 3.04–3.99 mmol/g was achieved by the carbons. Q st of the NSCDCs was 22.6–28.7 kJ/mol, and CO 2 adsorption selectivity over N 2 was 10.5–17.3 at 25 °C and 1 bar. At 25 °C and 20 bar, CO 2 uptake increased to 11.26–17.29 mmol/g, and exhibited linear dependence on specific surface area. The current work indicated that MES potassium salt/PIPES dipotassium salt could be used as activator for convenient synthesis of NSCDCs as efficient CO 2 adsorbents.
危险品化学品经营许可证（带存储）