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Synthesis and characterization of CTAB-silica nanocapsules and its adsorption behavior towards Pd(II) ions in aqueous solution
Advanced Powder Technology ( IF 4.2 ) Pub Date : 2020-06-22 , DOI: 10.1016/j.apt.2020.06.007
Norasikin Saman , Norfadhilah Aiman Ahmad Kamal , Jimmy Wei Ping Lye , Hanapi Mat

The silica nanocapsules (SiNC) with CTAB (SiNC-CTAB) and free CTAB (SiNC-FREE) were prepared by the microemulsion polymerization process, in which the cetyltrimethylammonium bromide (CTAB) was used as a structure directive as well as a cationic functionalized agent. The structure and properties of these adsorbents were characterized by a field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), nitrogen adsorption–desorption (NAD) analyzer, Fourier transform infrared (FTIR) spectrophotometer, thermogravimetric analyzer (TGA) and pH at point zero charges (pHpzc) determination. The adsorbents were then characterized for their adsorption behavior towards Pd(II) ions in aqueous solution performed in a batch adsorption experiment. The maximum adsorption capacity of Pd(II) ions onto SiNC-CTAB obtained from the adsorption isotherm was 124.50 mg g−1, which was over 2.4 times higher than that of the SiNC-FREE (51.28 mg g−1). The diffusion modeling analysis by the Weber Morris model indicated that the film diffusion is the controlling step, while the chemical reaction modeling obeyed the pseudo-second order kinetic model. The SiNC-CTAB was found to be reusable in which a good adsorption performance of up to 4 adsorption cycles was observed.



中文翻译:

CTAB-二氧化硅纳米胶囊的合成,表征及其对水溶液中Pd(II)离子的吸附行为

通过微乳液聚合法制备了具有CTAB(SiNC-CTAB)和游离CTAB(SiNC-FREE)的二氧化硅纳米胶囊(SiNC),其中十六烷基三甲基溴化铵(CTAB)被用作结构指令以及阳离子官能化剂。这些吸附剂的结构和性质通过场发射扫描电子显微镜(FESEM),透射电子显微镜(TEM),氮吸附解吸(NAD)分析仪,傅立叶变换红外(FTIR)分光光度计,热重分析仪(TGA)和零电荷点的pH值(pH pzc)确定。然后表征吸附剂在间歇吸附实验中对水溶液中Pd(II)离子的吸附行为。由吸附等温线获得的Pd(II)离子在SiNC-CTAB上的最大吸附容量为124.50 mg g -1,是SiNC-FREE(51.28 mg g -1)的2.4倍以上。Weber Morris模型的扩散模型分析表明,膜扩散是控制步骤,而化学反应模型服从伪二级动力学模型。发现SiNC-CTAB是可重复使用的,其中观察到高达4个吸附循环的良好吸附性能。

更新日期:2020-06-22
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