无机颗粒物去除重金属有毒离子IX. 水合锰和锡氧化物对汞（II）的快速高效去除
Inorganic particulates in removal of heavy metal toxic ions IX. Rapid and efficient removal of Hg(II) by hydrous manganese and tin oxides.
作者信息
Mishra Shuddhodan P, Dubey Som Shankar, Tiwari Diwakar
机构信息
Nuclear and Radiochemistry Laboratory, Department of Chemistry, Banaras Hindu University, Varanasi 221005, India.
出版信息
J Colloid Interface Sci. 2004 Nov 1;279(1):61-7. doi: 10.1016/j.jcis.2004.06.047.
Batch studies have been carried out in the removal of Hg(II) from aqueous solutions by using well-synthesized and -characterized hydrous manganese oxide (HMO) and hydrous tin oxide (HTO) employing a radiotracer technique. Results obtained reveal that increased sorptive concentration (10(-8)-10(-2) mol dm(-3)), temperature (298-328 K), and pH (ca. 2.0-10.5) enhance the removal efficiency of these solids. First-order uptake of Hg(II) on HMO and HTO follows the Freundlich adsorption isotherm for entire concentration range. Positive values of DeltaH0 for the uptake process on both solids indicate endothermic uptake and desorption experiments point to irreversible uptake. Radiation stability of the adsorbents has also been assessed using a 300-mCi (Ra-Be) neutron source having an integral neutron flux of 3.85 x 10(6) N cm(-2) s(-1) and associated with a nominal gamma-dose of ca. 1.72 Gy/h.
采用放射性示踪技术，利用合成良好且表征充分的水合氧化锰（HMO）和水合氧化锡（HTO），对从水溶液中去除汞（II）进行了批次研究。所得结果表明，吸附剂浓度增加（10⁻⁸ - 10⁻² mol dm⁻³）、温度升高（298 - 328 K）以及pH值升高（约2.0 - 10.5）会提高这些固体的去除效率。在整个浓度范围内，汞（II）在HMO和HTO上的一级吸附遵循弗伦德利希吸附等温线。两种固体上吸附过程的ΔH⁰正值表明吸附是吸热的，而解吸实验表明吸附是不可逆的。还使用了一个300毫居里（镭 - 铍）中子源评估了吸附剂的辐射稳定性，该中子源的积分中子通量为3.85×10⁶ N cm⁻² s⁻¹，且伴有约1.72 Gy/h的标称伽马剂量。
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