玉米秸秆改性生物炭对磺胺类抗生素的吸附特性

doi:10.19741/j.issn.1673-4831.2021.0021

摘要/Abstract

摘要： 利用玉米秸秆制备生物炭，并利用硝酸进行改性，探究了未改性生物炭（BC）和酸改性生物炭（HBC）对磺胺氯哒嗪（SCP）、磺胺甲恶唑（SMZ）和磺胺二甲基嘧啶（SMA）的吸附性能。结果表明，2种生物炭对SCP、SMZ和SMA的吸附过程均以准二级动力学方程拟合效果较好，酸改性生物炭的吸附速率高于未改性生物炭，且2种生物炭的反应均为自发、吸热和无序过程；Langmuir方程能够更好地用于描述吸附过程，HBC对抗生素的吸附能力大于BC。在混合体系中，BC和HBC对SCP和SMZ的吸附能力优于SMA。总体而言，酸改性生物炭对SCP、SMZ和SMA的吸附效果优于未改性生物炭。

关键词: 生物炭, 酸改性, 磺胺氯哒嗪, 磺胺甲恶唑, 磺胺二甲基嘧啶, 吸附

Abstract: In this study, biochar was prepared from corn straw (BC) and modified by nitric acid (HBC). The adsorption properties of biochar on sulfachloropyridazine(SCP), sulfamethoxazole(SMZ) and sulfamethazine(SMA) before and after modification were investigated. The results show that the adsorption kinetics of both kinds of biochar on the three antibiotics were all well fitted by the quasi-second-order kinetic equations. The adsorption rate of acid-modified biochar was higher than that of unmodified biochar. The whole adsorption processes of the two kinds of biochar were spontaneous, endothermic and disordered which can be better described by Langmuir model. The adsorption capacity of HBC was greater than that of BC. In the mixed system, the adsorption capacity of SCP and SMZ on BC and HBC was better than that of SMA. Overall, the adsorption effect of SCP, SMZ and SMA on acid-modified biochar was better than that on unmodified biochar.

Key words: biochar, acid modification, sulfachloropyridazine, sulfamethoxazole, sulfamethazine, adsorption

中图分类号:

X131.2

宋豆豆, 李莉, 刘伟婷. 玉米秸秆改性生物炭对磺胺类抗生素的吸附特性[J]. 生态与农村环境学报, 2021, 37(11): 1473-1480.

SONG Dou-dou, LI Li, LIU Wei-ting. Research of Adsorption Characteristics of Sulf Antibiotics on Corn Stover Biochar[J]. Journal of Ecology and Rural Environment, 2021, 37(11): 1473-1480.

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