Armağan Bülent
Istanbul Technical University, Department of Environmental Engineering, Maslak, Istanbul, Turkey.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2003 May;38(5):883-96. doi: 10.1081/ese-120018598.
In this study, the adsorption mechanism of three reactive azo dyes (Everzol Black B, Everzol Red 3BS, Everzol Yellow 3RS H/C) on natural porous minerals, sepiolite and zeolite, have been examined in order to identify the ability of clay minerals on the removal of colored textile dyes from aqueous solutions. High ion exchange capacity, high surface areas and importantly their relatively cheap prices make them attractive adsorbents. For this purpose, series of batch adsorption tests were carried out as a function of solids concentration, time and dye concentration using natural and modified sepiolites and zeolites. Also, experiments were conducted to determine the amount of solid to be used in adsorption tests. An optimum solids concentration was selected as 0.05 g/mL (5%). Most of the adsorption was found to take place within the first 2h of mixing, taking into account the extreme changes like pH and concentration, the mixing period was selected as 4 h for further testing. The adsorption results indicate that both natural sepiolite and zeolite have limited adsorption capacities of the reactive dyes but are substantially improved by modifying their surfaces with quaternary amines. The mechanism of adsorption process is elucidated on the basis of experimental data.
在本研究中，为了确定粘土矿物从水溶液中去除有色纺织染料的能力，研究了三种活性偶氮染料（Everzol黑B、Everzol红3BS、Everzol黄3RS H/C）在天然多孔矿物海泡石和沸石上的吸附机制。高离子交换容量、高比表面积以及重要的是它们相对较低的价格使它们成为有吸引力的吸附剂。为此，使用天然和改性海泡石及沸石，进行了一系列作为固体浓度、时间和染料浓度函数的批量吸附试验。此外，还进行了实验以确定吸附试验中所用固体的量。选择最佳固体浓度为0.05 g/mL（5%）。考虑到pH值和浓度等极端变化，发现大部分吸附在混合的前2小时内发生，因此选择4小时的混合时间进行进一步测试。吸附结果表明，天然海泡石和沸石对活性染料的吸附容量有限，但通过用季胺对其表面进行改性可大幅提高吸附容量。根据实验数据阐明了吸附过程的机制。
