石墨烯
生物炭
吸附
材料科学
电子
自组装
纳米技术
化学工程
比例(比率)
化学物理
化学
物理化学
物理
热解
量子力学
工程类
作者
Hanbo Chen,Yurong Gao,Zheng Fang,Jiayi Li,Suresh C. Pillai,Hocheol Song,Chenghua Sun,Nanthi Bolan,Xing Yang,Meththika Vithanage,Shengdao Shan,Hailong Wang
标识
DOI:10.1016/j.cej.2024.150740
摘要
Environmental contamination posed by trivalent antimony [Sb(III)] in water has been globally recognized as a complex challenge, garnering considerable public concern. To enhance the adsorption efficiency of pristine biochar (BC) for Sb(III), a novel Fe/graphene-loaded biochar (FeGB) gel was synthesized through a facile in-situ self-assembly method. This study aimed to investigate the adsorption performance and elucidate the electron-scale adsorption mechanism for Sb(III) by the FeGB-gel. The Sb(III) adsorption isotherm data fitted well with the Langmuir model, and the maximum Sb(III) adsorption capacity of FeGB-gel (113.1 mg g−1) was significantly higher compared to that of BC (28.6 mg g−1). Spectroscopic investigations revealed that surface complexation and π–π stacking were the key mechanisms for Sb(III) adsorption. Electrochemical analyses confirmed an enhanced electron-accepting capacity (0.815 mmol e- g−1) of FeGB-gel, linked to the formation of Fe-related functional groups (Fe–O and Fe–O–OH), which contributed to a stronger Sb(III) oxidation capacity than BC (78.5 % v.s. 49.3 %). Density functional theory calculations highlighted that the presence of defects on graphene nanosheets enhanced the anchoring of FeOx on biochar, thereby elevating the Sb(III) adsorption energy of FeGB-gel to −1.96 eV. Additionally, the projected density of states profile suggested that the enhanced adsorption of FeGB-gel could be attributable to the orbital hybridization of Sb-p, O-p, and Fe-p/d orbitals (i.e., Fe–O–Sb bonding), which strengthened the electron transfer and chemical interaction during the Sb(III) removal process. The functionalization of biochar surface characteristics with Fe/graphene offers possibilities for a diverse range of biochar-based adsorbents and their application in addressing numerous environmental concerns.
科研通智能强力驱动
Strongly Powered by AbleSci AI