玉米芯对磺胺甲恶唑和甲氧苄啶的吸附效果及机制

张艳杰; 董伟羊; 王欢; 闫国凯; 常洋; 王海燕; 凌宇

doi:10.12153/j.issn.1674-991X.20220375

玉米芯对磺胺甲恶唑和甲氧苄啶的吸附效果及机制

doi: 10.12153/j.issn.1674-991X.20220375

张艳杰^{1, 2,},
董伟羊²,
王欢²,
闫国凯²,
常洋²,
王海燕^{1, 2, ,},
凌宇^{1, 2}

1.
环境基准与风险评估国家重点实验室, 中国环境科学研究院
2.
环境污染控制工程技术研究中心, 中国环境科学研究院

基金项目: 国家重点研发计划项目（2019YFC0408602）；中央财政科技计划结余经费专项（2021-JY-33）

详细信息

作者简介:
张艳杰（1998—），女，硕士研究生，主要研究方向为水污染控制理论与技术，zyj2950236115@163.com

通讯作者:
王海燕（1976—）女，研究员，博士，主要从事水污染防控原理与技术研究，wanghy@craes.org.cn

中图分类号: X703
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出版历程
- 收稿日期: 2022-04-22

Adsorption effect and mechanism of sulfamethoxazole and trimethoprim on corncob

ZHANG Yanjie^{1, 2
,},
DONG Weiyang²,
WANG Huan²,
YAN Guokai²,
CHANG Yang²,
WANG Haiyan^{1, 2
, ,},
LING Yu^{1, 2}

1.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences
2.
Research Center of Environmental Pollution Control Technology, Chinese Research Academy of Environmental Sciences

摘要

摘要:
为探究农业废物是否能吸附去除抗生素以及不同抗生素之间是否存在相互作用，通过对玉米芯的理化特征分析、傅里叶红外光谱分析、吸附动力学和吸附等温线分析，研究了玉米芯对磺胺甲恶唑（SMX）和甲氧苄啶（TMP）的吸附效果及机制。结果表明：在只含有单一抗生素（初始浓度为 10mg/L）、温度为25 ℃、玉米芯浓度为25 g/L的体系中，玉米芯对SMX和TMP吸附量分别为131.18和358.75 mg/kg；在同时含有SMX和TMP的体系中（初始浓度均为 10mg/L），玉米芯对其的吸附量分别为131.02和358.74 mg/kg，SMX和TMP之间为非交互吸附过程。在2种体系中，SMX和TMP的吸附均较好地符合准二级反应动力学方程，Langmuir和Freundlich等温线较好地拟合了SMX的吸附过程，而Freundlich等温线对TMP的拟合效果较好。SMX吸附主要为静电作用、π-π堆积作用，且以静电作用为主；TMP吸附主要通过疏水分配、π-π堆积作用和氢键作用。
- 玉米芯 /
- 吸附 /
- 磺胺甲恶唑(SMX) /
- 甲氧苄啶(TMP) /
- π-π堆积作用
Abstract:
To explore whether agricultural wastes can adsorb antibiotics and whether there is an interaction between different antibiotics, the physicochemical characteristics analysis of corncob, Fourier Infrared Spectroscopy analysis, adsorption kinetics, and adsorption isotherms analysis were used to study the adsorption effect and mechanism of sulfamethoxazole (SMX) and trimethoprim (TMP) on corncob. The results showed that SMX and TMP adsorption capacities on corncob were 131.18 and 358.75 mg/kg in the system with single antibiotic （the initial concentration was 10 mg/L） at 25 ℃ and corncob concentration of 25 g/L , and they were 131.02 and 358.74 mg/kg in the coexistence system with both SMX and TMP（the initial concentration both were 10 mg/L）, respectively. There was non-interactive adsorption between SMX and TMP in the coexistence system. The adsorption kinetics of SMX and TMP were better represented by the pseudo-second-order kinetic model in the two systems. Both Langmuir and Freundlich isotherms were well fitted with the SMX adsorption process, and the adsorption of TMP was described well by the Freundlich isotherm. SMX was mainly adsorbed by electrostatic interaction and π-π stacking mechanism, and the electrostatic interaction played the main role. The adsorption of TMP was mainly due to the hydrophobic distribution, π-π stacking, and hydrogen bonding.
- corncob /
- adsorption /
- sulfamethoxazole (SMX) /
- trimethoprim (TMP) /
- π-π stacking mechanism

HTML全文

图 1 玉米芯的理化特征

Figure 1. Physicochemical characteristics of corncob

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图 2 玉米芯对一元和二元溶质体系中SMX和TMP在不同时刻的吸附量

Figure 2. Adsorption capacity of SMX and TMP on corncob in single and binary solute systems at different time

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图 3 玉米芯对一元和二元溶质体系中SMX和TMP的动力学模型拟合

Figure 3. Adsorption kinetics fitting of SMX and TMP on corncob in single and binary solute systems

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图 4 玉米芯对一元和二元溶质体系中SMX和TMP的吸附等温线

Figure 4. Adsorption isotherms of SMX and TMP on corncob in single and binary solute systems

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图 5 吸附平衡时玉米芯对一元和二元溶质体系中SMX和TMP的去除率和去除量

Figure 5. Removal rate and removal amount of SMX and TMP on corncob in single and binary solute systems at adsorption equilibrium

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图 6 玉米芯吸附抗生素前后的红外光谱

Figure 6. Infrared spectra of corncob before and after antibiotic adsorption

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表 1 SMX和TMP的基本理化性质

Table 1. Basic physicochemical properties of SMX and TMP

抗生素	分子式	分子量	化学物质登录号（CAS）	辛醇-水分配系数（lg K_ow）	酸度系数（pKa）
SMX^[21-22]	C₁₀H₁₁N₃O₃S	253.278	723-46-6	0.89	1.6、5.7
TMP^[22]	C₁₄H₁₈N₄O₃	290.318	738-70-5	0.91~1.26	6.8

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表 2 玉米芯吸附一元和二元溶质体系中SMX和TMP的动力学参数

Table 2. Kinetic parameters for adsorption of SMX and TMP on corncob in single and binary solute systems

体系	q_e,exp/(mg/kg)	准一级反应动力学模型			准二级反应动力学模型			颗粒内扩散模型
体系	q_e,exp/(mg/kg)	q_e/(mg/kg)	k₁/min^-1	R²	q_e/(mg/kg)	k₂/〔kg/(mg·min)〕	R²	k_d/〔mg/(kg·min^1/2)〕	c	R²
一元SMX	131.18	130.75	0.0450	0.96	135.37	0.0009	0.99	3.55	76.81	0.51
一元TMP	358.75	357.07	1.5682	0.96	357.95	0.0116	0.92	1.20	344.01	0.01
二元SMX	131.02	126.22	0.1142	0.99	141.64	0.0010	0.99	10.86	26.86	0.63
二元TMP	358.74	356.10	1.5407	0.71	360.22	0.0113	0.96	1.54	344.51	0.12
注：q_e,exp为吸附动力学试验中的平衡吸附量。

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表 3 玉米芯对一元和二元溶质体系中SMX和TMP的等温线拟合参数

Table 3. Fitting parameters of adsorption isotherms of SMX and TMP on corncob in single and binary solute systems

体系	Langmuir等温线			Freundlich等温线
体系	q_m/(mg/kg)	K_L/(L/mg)	R²	K_F/{mg/〔kg·(L/mg)^1/n〕}	1/n	R²
一元SMX	1669.77	0.014	0.99	27.10	0.87	0.99
一元TMP	−963.02	−4.415	0.84	282.39	1.27	0.99
二元SMX	1281.69	0.017	0.99	24.28	0.89	0.99
二元TMP	−767.75	−3.993	0.76	258.12	1.63	0.98

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