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本文对常用的染料亚甲基蓝(MB)在海洋沉积物上的吸附行为进行了研究,发现它的吸附机理主要是在沉积物上的表面吸附和微孔作用,吸附与黏土矿物的含量有一定的相关性。在实验浓度范围内,MB在3种不同处理方式沉积物上的吸附行为都可以用Freundlich等温式来描述。通过改变吸附条件发现,随着盐度的增加,吸附能力减小,而温度的改变,对吸附能力的影响并不明显。此外,通过向体系中加入不同表面活性剂来模拟双溶质体系的方法,对MB与表面活性剂的竞争吸附行为进行了研究。结果发现在2种介质中,吐温20(Tween20)的加入对吸附的影响均不大;十六烷基三甲基溴化铵(CTAB)的加入使MB的吸附能力减弱,在蒸馏水中抑制作用更加明显;在海水中,十二烷基苯磺酸钠(SDBS)对吸附有抑制作用,而在蒸馏水中,SDBS却对吸附起到促进作用。
In this paper, the adsorption behavior of commonly used methylene blue (MB) on marine sediments was studied and it was found that its adsorption mechanism was mainly surface adsorption and micropore on sediment. The adsorption was related to the content of clay minerals Sex. The adsorption behavior of MB on sediments of three different treatments within the experimental concentration range can be described by Freundlich isotherm. By changing the adsorption conditions, it was found that with the increase of salinity, the adsorption capacity decreased, while the change of temperature had no obvious effect on the adsorption capacity. In addition, competitive adsorption of MB with surfactants was studied by adding different surfactants to the system to simulate the two-solute system. The results showed that the addition of Tween 20 had little effect on the adsorption in two media; the addition of CTAB decreased the adsorption capacity of MB, and inhibited the adsorption in distilled water In the seawater, sodium dodecylbenzenesulfonate (SDBS) has an inhibitory effect on the adsorption, while in the distilled water, SDBS can promote the adsorption.