Ahn Chi K, Park Donghee, Woo Seung H, Park Jong M
Department of Chemical Engineering, Advanced Environmental Biotechnology Research Center, School of Environmental Science and Engineering, Pohang University of Science and Technology, Hyoja-Dong, Pohang, Republic of Korea.
J Hazard Mater. 2009 May 30;164(2-3):1130-6. doi: 10.1016/j.jhazmat.2008.09.036. Epub 2008 Sep 19.
To increase their capacity to adsorb heavy metals, activated carbons were impregnated with the anionic surfactants sodium dodecyl sulfate (SDS), sodium dodecyl benzene sulfonate (SDBS), or dioctyl sulfosuccinate sodium (DSS). Surfactant-impregnated activated carbons removed Cd(II) at up to 0.198 mmol g(-1), which was more than an order of magnitude better than the Cd(II) removal performance of activated carbon without surfactant (i.e., 0.016 mmol g(-1)) even at optimal pH (i.e., pH 6). The capacity of the activated carbon to adsorb Cd(II) increased in proportion to the quantity of surfactant with which they were impregnated. The kinetics of the adsorption of Cd(II) onto the surfactant-impregnated activated carbon was best described by a pseudo-second-order model, and was described better by the Freundlich adsorption isotherm than by the Langmuir isotherm. The surface charge of activated carbon was negative in all pH ranges tested (2-6). These results indicate that surface modification with anionic surfactant could be used to significantly enhance the capacity of activated carbon to adsorb cations.
为了提高活性炭吸附重金属的能力，用阴离子表面活性剂十二烷基硫酸钠（SDS）、十二烷基苯磺酸钠（SDBS）或二辛基磺基琥珀酸钠（DSS）对活性炭进行了浸渍。浸渍了表面活性剂的活性炭对Cd（II）的去除量高达0.198 mmol g⁻¹，即使在最佳pH值（即pH 6）下，这也比未浸渍表面活性剂的活性炭对Cd（II）的去除性能（即0.016 mmol g⁻¹）好一个多数量级。活性炭吸附Cd（II）的能力与浸渍的表面活性剂的量成正比。Cd（II）在浸渍了表面活性剂的活性炭上的吸附动力学最好用准二级模型来描述，用弗伦德利希吸附等温线比用朗缪尔等温线描述得更好。在所有测试的pH范围（2 - 6）内，活性炭的表面电荷均为负。这些结果表明，用阴离子表面活性剂进行表面改性可显著提高活性炭吸附阳离子的能力。
