摘要

从畜禽废水中排出的四环素（TC）对生态系统和人类健康造成药理威胁，引起了公众的关注。悬浮有机物（SOMs）作为废水中的重要媒介，在抗生素运输和降解中发挥着重要作用。然而，相关文献报道的信息有限。本研究调查了从猪废水中回收的SOM对TC的吸附行为。结果表明，TCs具有较高吸附能力，最大吸附值范围在0.337~0.679 mg / g。随着pH和温度的升高，吸附能力下降。三维激发 - 发射矩阵荧光光谱和傅里叶变换红外光谱的结果表明，酰胺基和羧基是吸附TCs的主要官能团。 SOM和TC之间的相互作用在酸性条件下以氢键和阳离子交换为主，在中性或碱性条件下以静电排斥为主。进行了吸附动力学模拟，并用Freundlich方程得到了令人满意的拟合结果。这些结果表明，吸附过程是一个相当复杂的过程，涉及阳离子交换和氢键的组合。这些结果将有助于更好地了解SOM在废水处理过程中TCs运输和减排的能力。

Tetracyclines (TCs) discharged from livestock wastewater have aroused public concerns due to their pharmacological threats to ecosystems and human health. As an important medium in the wastewater, suspended organic matters (SOMs) play vital roles in antibiotics transport and degradation. However, limited information has been reported in the relevant literature. This study investigated TCs sorption behavior on SOM, withdrawn from swine wastewater. High TCs sorption capacities were detected, with the maximum values ranging from 0.337 to 0.679 mg/g. Increasing pH and temperature led to the decline of sorption capacity. Results from three-dimensional excitation–emission matrix fluorescence spectroscopy and Fourier transform infrared spectrometry revealed that amide and carboxyl groups were the main functional groups for TCs adsorption. The interactions between SOM and TCs were clarified as predominated by hydrogen-bonding and cation-exchange in acid conditions, and electrostatic repulsion in neutral or alkaline conditions. Adsorption kinetics modeling was conducted, and a satisfactory fitting was achieved with the Freundlich equation. These results indicated that the adsorption process was a rather complex process, involving a combination of cation-exchange and hydrogen-bonding. The results will provide a better understanding of the capability of SOM for TCs transport and abatement in the wastewater treatment process.

https://www.sciencedirect.com/science/article/pii/S1001074216313912