National Physical Laboratory, Council of Scientific and Industrial Research, New Delhi 110 012, India.
J Colloid Interface Sci. 2011 Nov 1;363(1):42-50. doi: 10.1016/j.jcis.2011.07.018. Epub 2011 Jul 23.
We depict a novel strategy exploiting the chemistry of metal ion adsorption for detection and sequestration of toxic heavy metal from processed water using gold nanoparticles capped with 4-aminothiophenol. The interaction between 4-aminothiophenol capped gold nanoparticles and heavy metal ions was studied as a function of time and concentration using TEM, HRTEM, SEM, EDS, and I-V characterization. Experiments confirmed that pH is one of the crucial controlling parameters. Adsorption capacity was monitored using AAS, UV-vis spectroscopy and I-V measurement. In the absence of any alloy formation between Au and heavy metal ions, the desorption of the heavy metal ions from 4-aminothiophenol capped gold nanoparticles surface by pH modulation serves as a mean of collection of heavy metal ions. Experiments revealed that the concentration of heavy metal ions in processed water after adsorption is below the maximum permissible limit set by the WHO.
我们描述了一种新策略，利用金属离子吸附的化学性质，使用 4-巯基苯胺包覆的金纳米粒子从处理水中检测和螯合有毒重金属。使用 TEM、HRTEM、SEM、EDS 和 I-V 特性研究了 4-巯基苯胺包覆的金纳米粒子与重金属离子之间的相互作用随时间和浓度的变化。实验证实 pH 值是关键控制参数之一。使用 AAS、UV-vis 光谱和 I-V 测量监测吸附容量。在 Au 和重金属离子之间没有任何合金形成的情况下，通过 pH 调节从 4-巯基苯胺包覆的金纳米粒子表面解吸重金属离子可作为收集重金属离子的一种手段。实验表明，吸附后处理水中重金属离子的浓度低于世界卫生组织设定的最大允许限值。
