Adsorption of cadmium ion from aqueous solution by ground wheat stems
Adsorption of cadmium ion from aqueous solution by ground wheat stems
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DOI：
10.1016/j.jhazmat.2008.09.082
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发表时间：
2009-05-30
影响因子：
13.6
通讯作者：
Xiao, Dan
中科院分区：
文献类型：
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作者：
Tan, Guangqun;Xiao, Dan
研究了水溶液中镉在磨碎的小麦茎上的吸附行为，以了解所涉及的物理化学过程并探索小麦茎在废水处理中的潜力。结果显示，每克磨碎的小麦茎秆可吸附0.1032毫摩尔的镉。结合过程受溶液pH值影响很大，最适pH值为5.0。该过程遵循 Langmuir 等温线模型。通过化学修饰封闭小麦茎上的官能团会导致最大镉结合能力下降，而增加官能团的数量可以增强小麦茎上的镉结合能力。傅里叶变换红外光谱仪（FTIR）分析证实了化学修饰过程，并表明磨碎的小麦茎上的COO-基团是镉吸附过程中的主要活性基团之一。 X 射线光电子能谱 (XPS) 数据进一步表明，镉以 Cd2+ 的形式被吸附，并附着在磨碎的小麦茎上的 O- 基团上。 (C) 2008 Elsevier B.V. 保留所有权利。
The adsorption behavior of cadmium on ground wheat stems has been investigated in aqueous solution to understand the physicochemical process involved and to explore the potentiality of wheat stems in wastewater treatment. The results have shown that 0.1032 mmol of cadmium is adsorbed per gram of ground wheat stems. The binding process is strongly affected by solution pH, and the optimum pH is 5.0. The process obeys the Langmuir isotherm model. Blocking of the functional groups on ground wheat stems by chemical modification causes the decrease of the maximum cadmium binding capacity, while increasing the number of the functional groups can enhance the binding capacity of ground wheat stems. Fourier transform infrared spectrometer (FTIR) analysis confirms the chemical modification process and indicates that COO- groups on the ground wheat stems are one of the main active groups in cadmium adsorption process. The X-ray photoelectron spectroscopy (XPS) data further indicates that cadmium is adsorbed as Cd2+ and is attached to O- groups on the ground wheat stems. (C) 2008 Elsevier B.V. All rights reserved.