生物炭
溶解有机碳
化学
吸附
傅里叶变换红外光谱
腐植酸
弗伦德利希方程
猝灭(荧光)
环境化学
荧光
水溶液
无机化学
核化学
热解
有机化学
化学工程
肥料
物理
工程类
量子力学
作者
Yifan Wang,Jianen Li,Li‐Yan Xu,Qinbo Xu,Di Wu,Yunhe Ai,Dannan Li,Wei Liu,Jianhua Qu,Lei Wang,Ying Zhang
标识
DOI:10.1016/j.jece.2023.111115
摘要
This study investigated the interaction of biochar-derived dissolved organic matter (DOM) and metal pollutant Pb(II) during adsorption. Research data showed that the adsorption capacity of biochar and residual biochar (after removal of DOM) was 277.62 and 204.47 mg g−1, respectively, indicating that DOM played a significant role in enhancing the adsorption efficiency of Pb(II). The results indicated that the adsorption process of Pb(II) on biochar and residual biochar followed the pseudo-second-order kinetic equation (R2 > 0.99), and the adsorption isotherm was much closer Freundlich model. A combination of three-dimensional excitation-emission matrix (3D-EEM), synchronous fluorescence, Fourier transform infrared spectroscopy (FT-IR), and two-dimensional correlation spectroscopy (2D-COS) was employed to investigate the interaction between DOM and Pb(II). 3D-EEM indicated the presence of four major components of DOM, namely two protein-like substances, one humic acid-like substance, and one fulvic acid-like substance. The synchronous fluorescence revealed a gradual quenching of the fluorescence of the DOM sample with an increase in Pb(II) concentration, indicating a static quenching mechanism between DOM and Pb(II). FTIR-2D-COS analysis showed a specific sequence of DOM binding with Pb(II) is as follows: 1500 > 1010 > 880 > 1390 > 1260 cm−1. This findings have significant implications for the role of DOM in environmental science and have potential applications in various fields.
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