Area de Edafoloxía e Química Agrícola, Departamento de Bioloxía Vexetal e Ciencia do Solo, Univ. Vigo, Facultade de Ciencias, 32004 Ourense, Spain.
J Hazard Mater. 2010 Aug 15;180(1-3):622-7. doi: 10.1016/j.jhazmat.2010.04.079. Epub 2010 Apr 24.
The potential use of calcined mussel shells to purify water contaminated with mercury was evaluated. The Hg(II) adsorption and desorption kinetics were studied in batch-type and stirred-flow chamber experiments. The adsorption/desorption experiments revealed some differences between the batches of shells used. The batch of shells that displayed the greatest capacity to adsorb Hg(II), via a highly irreversible reaction, also contained more Fe and Al than the other batches. The results of the stirred-flow chamber experiments indicated a high degree of irreversibility in the process of Hg(II) adsorption in the mussel shell, and that Hg(II) was rapidly retained. The results of these experiments also revealed that the efficiency of depuration differed depending on the length of time that the system was used: when the system was operated for 55 min, depurating 162 mL of inflowing water g(-1) mussel shell, a 90% reduction in the initial concentration of Hg(II) was obtained; use of the system for 90 min, depurating 265 mL water g(-1) mussel shell, produced a 75% reduction in the initial Hg(II), and use of the system for 162.5 min, depurating 487 mL of water g(-1) mussel shell, resulted in a 50% reduction in the initial Hg(II).
评估了煅烧贻贝壳净化受汞污染水的潜力。通过批量和搅拌流室实验研究了 Hg(II)的吸附和解吸动力学。吸附/解吸实验表明，所用贝壳批次之间存在一些差异。通过高度不可逆反应显示出最大 Hg(II)吸附能力的贝壳批次，比其他批次含有更多的 Fe 和 Al。搅拌流室实验的结果表明，Hg(II)在贻贝壳中的吸附过程具有高度的不可逆性，Hg(II)被迅速截留。这些实验的结果还表明，净化效率取决于系统使用时间的长短：当系统运行 55 分钟，净化 162 毫升流入水 g(-1)贻贝壳时，初始 Hg(II)浓度降低了 90%；当系统运行 90 分钟，净化 265 毫升水 g(-1)贻贝壳时，初始 Hg(II)降低了 75%；当系统运行 162.5 分钟，净化 487 毫升水 g(-1)贻贝壳时，初始 Hg(II)降低了 50%。
