文献类型： 外文期刊
第一作者： Xu, H. Y.
作者： Xu, H. Y.;Ma, X. L.;Wang, B.;Yuan, M. Z.;Su, J. H.;Wang, Y. J.;Gao, H. J.
作者机构：
关键词： corn stalk; biomass char; pH; alkali modification; lead; material characterization
期刊名称：APPLIED ECOLOGY AND ENVIRONMENTAL RESEARCH （ 影响因子：0.816； 五年影响因子：0.896 ）
ISSN： 1589-1623
年卷期： 2022 年 20 卷 1 期
页码：
收录情况： SCI
摘要： In this study, corn straw and modified corn straw impregnated with Potassium hydroxide(KOH)were used as raw materials to prepare biochar (BC) and modified biochar (K-BC). SEM, FTIR, EDS and other analytical methods were used to study the structure of BC and K-BC, and the equilibrium adsorption method was used to compare and study the characteristics of BC and K-BC adsorbing Pb. The results show that when the solution is weakly acidic (pH 5), Quasi-second-order kinetics can accurately describe the adsorption process of Pb (R2 > 0.9875); the Langmuir model fits well, indicating that Pb adsorption by biochar is mainly a single-layer adsorption; the results of thermodynamic tests increment H degrees > 0, increment S degrees > 0, increment G degrees < 0 indicate that the adsorption of Pb by biochar is a spontaneous, endothermic, and disorderly increase process. Combining elemental analysis, specific surface area pore size determination, SEM, and EDS for the characterization of materials before and after adsorption, it can be seen that the difference between BC and K-BC adsorption of Pb comes from the difference between the specific surface areas, pore structures and aromatic structures of the materials, accompanied by the ion exchange effect.
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