Qu Jianhua, Meng Fansong, Bi Fuxuan, Jiang Zhao, Wang Mengning, Hu Qi, Zhang Yupeng, Yu Hui, Zhang Ying
School of Resources and Environment, Northeast Agricultural University, Harbin, 150030, China.
School of Pharmaceutical Engineering, Shenyang Pharmaceutical University, Shenyang, 110016, China.
Environ Res. 2025 Feb 15;267:120667. doi: 10.1016/j.envres.2024.120667. Epub 2024 Dec 18.
Nitrogen-doped porous hydrochar (NPHC) was successfully synthesized by hydrothermal carbonization and activation with KHCO, which was employed for scavenging hexavalent chromium (Cr(VI)) and bisphenol A (BPA) in contaminated water. N doping increased the unique active sites such as amino and molecular N in NPHC for adsorbing contaminants, and enhanced the activation effect. Compared to original (HC) and N-doped hydrochar (NHC), the S of material improved from 3.99 m/g and 4.71 m/g to 1176.77 m/g. Meanwhile, NPHC exhibited more superior adsorption capacity for Cr(VI) (323.25 mg/g) and BPA (545.34 mg/g) than that of porous hydrochar (213.17 and 343.67 mg/g). Moreover, NPHC possessed pH-dependence and presented more excellent tolerance for interfering ions and regeneration performance. Notably, the Cr(VI) capture by NPHC was dominated via pore filling, electrostatic interaction, reduction, and complexation, while π-π stacking, H-bond interaction, and hydrophobic action were relevant to the binding mechanism of BPA. Overall, the proposed functionalization strategy for biochar was conducive to enhance the remediation of water bodies.
通过水热碳化和用KHCO活化成功合成了氮掺杂多孔水炭（NPHC），其用于清除受污染水中的六价铬（Cr(VI)）和双酚A（BPA）。氮掺杂增加了NPHC中诸如氨基和分子氮等独特的活性位点以吸附污染物，并增强了活化效果。与原始水炭（HC）和氮掺杂水炭（NHC）相比，材料的比表面积从3.99 m²/g和4.71 m²/g提高到1176.77 m²/g。同时，NPHC对Cr(VI)（323.25 mg/g）和BPA（545.34 mg/g）的吸附容量比多孔水炭（213.17和343.67 mg/g）更优异。此外，NPHC具有pH依赖性，对干扰离子具有更优异的耐受性和再生性能。值得注意的是，NPHC对Cr(VI)的捕获主要通过孔隙填充、静电相互作用、还原和络合作用，而π-π堆积、氢键相互作用和疏水作用与BPA的结合机制有关。总体而言，所提出的生物炭功能化策略有利于增强水体修复。
