Dantas T N, Dantas Neto A A, Moura M C
Universidade Federal do Rio Grande do Norte, UFRN/PPGEQ, Natal/RN, Brazil.
Water Res. 2001 Jun;35(9):2219-24. doi: 10.1016/s0043-1354(00)00507-8.
In order to evaluate the sorption of heavy metals, a crude diatomite was impregnated with a microemulsion which showed remarkable increase in chromium sorption capacity as compared to untreated diatomite. Samples with two different granulometries were investigated, both yielding practically complete adsorption. The adsorption process is pH dependent and the best results for the initial Cr (III) concentration of 1.5 g/L were obtained at pH 2.95. The effect of the concentration of the chromium synthetic solution was also investigated. The adsorption isotherms were obtained (30. 40 and 50 degrees C) and the Freundlich and Langmuir models were used to determine the adsorption capacity of the adsorbent. Following the adsorption step, a desorption process was carried out using several eluant solutions. The best results were obtained using hydrochloric acid (100%) as eluant.
为了评估重金属的吸附情况，用一种微乳液浸渍了一种粗硅藻土，与未处理的硅藻土相比，其对铬的吸附能力有显著提高。研究了两种不同粒度的样品，二者均实现了几乎完全吸附。吸附过程取决于pH值，对于初始浓度为1.5 g/L的Cr(III)，在pH 2.95时获得了最佳结果。还研究了铬合成溶液浓度的影响。获得了吸附等温线（30、40和50摄氏度），并使用弗伦德利希模型和朗缪尔模型确定吸附剂的吸附容量。吸附步骤完成后，使用几种洗脱液进行了解吸过程。使用盐酸（100%）作为洗脱液获得了最佳结果。
