The Presence of Cu Facilitates Adsorption of Tetracycline (TC) onto Water Hyacinth Roots.
The Presence of Cu Facilitates Adsorption of Tetracycline (TC) onto Water Hyacinth Roots.
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Cu 的存在促进水葫芦根部对四环素 (TC) 的吸附
DOI：
10.3390/ijerph15091982
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发表时间：
2018-09-11
影响因子：
--
通讯作者：
Zhang Z
中科院分区：
文献类型：
--
作者：
Lu X;Tang B;Zhang Q;Liu L;Fan R;Zhang Z
采用静态吸附实验研究了水葫芦根系对四环素（TC）的吸附特性，以及铜（Cu）对TC吸附的交互作用。水葫芦根系对纯TC、1：1 TC-Cu和1：2 TC-Cu的去除率在58.9%~ 84.6%之间。Freundlich吸附等温线模型和准二级动力学模型拟合效果较好。TC + Cu处理的TC吸附热力学参数Δ G 0比TC单独处理的更负，表明TC吸附的自发性随Cu浓度的增加而增强。温度升高与水葫芦根系对TC的吸附量增加有关。在pH 4 ~ 6范围内，Cu（II）的添加显著增加了水葫芦根系对TC的吸附，这是因为Cu（II）在根表面与TC分子之间形成了一个强的金属桥，促进了TC的吸附。但在pH 6-10范围内，Cu（II）对水葫芦根系吸附TC的影响主要是由于其较强的静电排斥作用和CuOH+、Cu（OH）2的形成。因此，在不同的环境条件下，铜（II）和TC之间的相互作用应考虑到了解TC的环境行为，归趋和生态毒性。
Batch experiments were conducted to investigate the adsorption characteristics of tetracycline (TC), and the interactive effects of copper (Cu) on the adsorption of TC onto water hyacinth roots. TC removal efficiency by water hyacinth roots was ranging from 58.9% to 84.6%, for virgin TC, 1:1 TC-Cu and 1:2 TC-Cu. The Freundlich isotherm model and the pseudo-second-order kinetic model fitted the adsorption data well. Thermodynamics parameters ΔG0 for TC were more negative in the TC plus Cu than the TC-only treatments, indicating the spontaneity of TC adsorption increased with increasing of Cu concentrations. An elevated temperature was associated with increasing adsorption of TC by water hyacinth roots. The additions of Cu(II) significantly increased TC adsorption onto water hyacinth roots within the pH range 4 to 6, because copper formed a strong metal bridge between root surface and TC molecule, facilitating the adsorption of TC by roots. However, Cu(II) hindered TC adsorption onto water hyacinth roots on the whole at pH range from 6–10, since the stronger electrostatic repulsion and formation of CuOH+ and Cu(OH)2. Therefore, the interaction between Cu(II) and TC under different environmental conditions should be taken into account to understand the environmental behavior, fate, and ecotoxicity of TC.
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