Adsorption and desorption of 2,4,6-trichlorophenol onto and from ash as affected by Ag+, Zn2+, and Al3+
Adsorption and desorption of 2,4,6-trichlorophenol onto and from ash as affected by Ag+, Zn2+, and Al3+
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Ag、Zn2 和 Al3 影响 2,4,6-三氯苯酚在灰烬上的吸附和解吸
DOI：
10.1007/s11356-013-2122-y
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发表时间：
2014-02
期刊：
影响因子：
--
通讯作者：
Zhiguo Pei
中科院分区：
文献类型：
--
作者：
Guangcai Chen;Yusheng Wang;Zhiguo Pei
金属阳离子与有机污染物在自然环境中多是共存的。然而，它们在吸附过程中的相互作用尚未得到充分解决。本文研究了不同负电荷的无机阳离子（Ag+、Zn2+和Al3+）对2,4,6-三氯苯酚（TCP）在小麦秸秆灰分上和处理后灰分上的吸附和解吸的影响。TCP的吸附和解吸都是非线性的；等温线和动力学曲线分别用Freundlich方程和伪二阶模型拟合得很好。Ag+的存在促进了TCP的吸附，而Zn2+和Al3+的存在降低了TCP在灰分上的吸附。TCP对灰分的解吸表现出明显的滞后性，Ag+、Zn2+和Al3+的存在使其解吸滞后性减小。Zn2+和Al3+对TCP吸附的抑制归因于TCP与金属离子之间的部分吸附基团重叠。与Zn2+相比，Al3+具有更高的结合能力和更大的水合离子半径，具有更强的抑制作用。Ag+增强了TCP在灰分上的吸附作用，其原因是Ag+通过取代原有的Na+和Ca2+离子，并压缩这些金属离子的水合离子半径，从而减少了水分子在灰分表面的竞争性吸附。此外，Ag+能与含π电子的芳香族有机化合物结合，使灰分对TCP的吸附进一步增加。
Metal cations and organic pollutants mostly co-exist in the natural environment. However, their interactions in adsorption processes have yet to be adequately addressed. In the current study, the effect of inorganic cations with different charges (Ag+, Zn2+, and Al3+) on the adsorption and desorption of 2,4,6-trichlorophenol (TCP) onto and from processed ash derived from wheat (Triticum aestivumL.) straw was investigated. The adsorption and desorption of TCP were both nonlinear; the isotherm and kinetics curves fitted well using the Freundlich equation and a pseudo-second-order model, respectively. The presence of Ag+promoted TCP adsorption, while Zn2+and Al3+reduced TCP adsorption onto ash. The desorption of TCP from ash showed obvious hysteresis, and the presence of Ag+, Zn2+, and Al3+caused the desorption to be less hysteretic. The suppression of TCP adsorption by Zn2+and Al3+was ascribed to the partial overlapping of adsorption groups between TCP and metal ions. Al3+had a stronger inhibition effect than that of Zn2+due to its higher binding capacity and larger hydrated ionic radius than those of Zn2+. Enhanced adsorption of TCP onto ash by Ag+was ascribed to its ability to reduce the competitive adsorption of water molecules on ash surface by replacing the original ions, such as Na+and Ca2+, and compressing the hydrated ionic radius of these metal ions. In addition, Ag+was able to bind with the aromatic organic compounds containing π-electrons, which resulted in a further increase of TCP adsorption by ash.
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