University of Belgrade, Institute of Chemistry, Technology and Metallurgy, Department of Catalysis and Chemical Engineering, Njegoševa 12, 11000 Belgrade, Serbia.
J Contam Hydrol. 2013 Jul;150:1-11. doi: 10.1016/j.jconhyd.2013.03.004. Epub 2013 Mar 28.
Two series of organobentonites (OBs) were synthesized from Na(+)-exchanged bentonite clay from Bogovina, Serbia. In the first series the starting material was modified using hexadecyltrimethylammonium (HDTMA(+)) ion in the amounts corresponding to 0.2, 0.5, 1.0 and 2.0 of the CEC value. The second series was obtained using quaternary alkyl ammonium cations (QAACs) with different alkyl chain lengths: hexadecyltrimethylammonium (HDTMA(+)), dodecyltrimethylammonium (DDTMA(+)) and tetramethylammonium (TMA(+)) ions. The synthesized OBs were characterized. The adsorption of anionic reactive dye Reactive Black 5 (RB5) and Pb(2+) from single component solutions and their bi-component solution was investigated for both series of OBs. The adsorptive properties of the OBs were correlated to the amount and type of incorporated QAACs. The correlation was tested using different mathematical models and best fits were found. Experimental results showed that simultaneous adsorption of RB5 and Pb(2+) exhibited synergic effect. The adsorption capacity for both RB5 and Pb(2+) was higher in their bi-component solution than in single-component solutions. These results indicate the creation of new adsorption sites during the simultaneous adsorption.
两种有机膨润土（OB）系列是由塞尔维亚 Bogovina 的 Na(+)-交换膨润土粘土合成的。在第一个系列中，使用十六烷基三甲基铵（HDTMA(+)）离子对起始材料进行改性，其用量分别对应于 CEC 值的 0.2、0.5、1.0 和 2.0。第二个系列是用不同链长的季铵盐阳离子（QAAC）合成的：十六烷基三甲基铵（HDTMA(+)）、十二烷基三甲基铵（DDTMA(+)）和四甲基铵（TMA(+)）离子。合成的 OB 进行了表征。研究了两种 OB 系列对阴离子活性染料活性黑 5（RB5）和 Pb(2+)单组分溶液及其双组分溶液的吸附性能。OBs 的吸附性能与掺入的 QAAC 的数量和类型有关。使用不同的数学模型对相关性进行了测试，找到了最佳拟合。实验结果表明，RB5 和 Pb(2+)的同时吸附表现出协同效应。在双组分溶液中，RB5 和 Pb(2+)的吸附容量均高于单组分溶液。这些结果表明，在同时吸附过程中形成了新的吸附位点。
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