氨基磺酸改性花生壳生物炭对微囊藻毒素-LR的吸附性能研究
Adsorption Performance of Sulfamic Acid-modified Peanut Shell Biochar on Microcystin-LR
曾益宣 1王华生 1宋芳琪 1吴文昱1
作者信息
- 1. 江西理工大学,江西 赣州 341000
- 折叠
摘要
利用氨基磺酸改性热解法制备改性花生壳生物炭,利用SEM、BET和XPS对生物炭进行表征,并开展对水体中微囊藻毒素-LR的吸附实验.结果表明,改性后的生物炭表面具有微米级孔隙和气泡状团聚物,比表面积和孔体积增大,新增了磺酸基团,含氧官能团增加;吸附过程符合二级动力学,吸附等温线符合Freundlich模型;过高的pH值和大分子量的可溶性有机物会明显抑制吸附;吸附机理涉及孔填充作用、静电相互作用、氢键作用和π-π作用.
Abstract
The modified peanut shell biochar was prepared by sulfamic acid-modified pyrolysis,characterised by SEM,BET and XPS,and adsorption experiments on microcystin-LR in water were carried out.The results showed that the modified biochar surface had micron-sized pores and bubble-like agglomerates,the specific surface area and pore volume increased,new sulfonic acid groups were added,and oxygen-containing functional groups increased;the adsorption process conformed to the second-order kinetics,and the adsorption isotherm conformed to the Freundlich model;excessive pH and large molecular weight dissolved organic matter significantly inhibited the adsorption;and the adsorption mechanism involved pore-filling effect,electrostatic interaction,hydrogen bonding and π-π interaction.
关键词
生物炭/氨基磺酸/MC-LR/花生壳/吸附Key words
biochar/sulfamic acid/microcystin-LR/peanut shells/adsorption引用本文复制引用
出版年
2024
NETL
NSTL
万方数据