Feasible preparation and characterization of tunable novel montmorillonite/block-copolymers based composites as potential dual adsorbent candidates

Chen, Hsuan-Hsuan; Thirumavalavan, Munusamy; He, Ru-Zhen; Shih, Ya-Ting; Lee, Jiunn‐Fwu

doi:10.1016/j.clay.2016.12.028

Cited by 4 publications

(1 citation statement)

References 31 publications

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“…Montmorillonite (Mt) is a 2:1 type of layered silicate mineral composed of two silica tetrahedral sheets (SiO 4 ) sandwiching an aluminum octahedral sheet [Al 2−x Mg x O 4 (OH) 4 ]. Mt is negatively charged due to the isomorphous replacement of mainly Mg 2+ for Al 3+ in the octahedral sheet [1,2,3,4]. Therefore, the natural Mt can attract species with opposite charges, such as heavy metal ions and organic cations, and it also shows high specific surface area, high cation exchange capacity (CEC), and micro and meso-porosity properties [5,6].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of a Dual-Cation Organomontmorillonite Nanocomposite

et al. 2018

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In this study, a novel dual-cation organomontmorillonites (OMt) nanocomposite was synthesized by two kinds of modifiers cetyltrimethylammonium chloride and cysteamine hydrochloride, and the adsorption behavior of modifiers into montmorillonite (Mt) has been investigated. The OMt were characterized by techniques, such as X-ray diffraction (XRD), Fourier Transform Infrared (FTIR) spectroscopy, and thermogravimetric and differential thermal (TG-DTA) analyses. The effects of temperature, contact time, the order of addition and the concentration of organic modifiers on the amounts of organics adsorbed were investigated. The adsorption amount of cetyltrimethylammonium chloride (CTAC) and cysteamine hydrochloride (CSH) increased with the increase of the added CTAC amount and contact time, while the addition order of modifiers and modification temperature had no significant effect on the actual adsorption amount of CTAC and CSH on Mt, as confirmed by the XRD patterns. The experimentally determined isotherms showed a good fit with the Langmuir adsorption models. The adsorption kinetics demonstrated that the adsorption of CTAC and CSH by Mt followed the pseudo-second-order model, and CTAC adsorption rate on Mt was faster than that of CSH. FTIR spectrum clearly revealed the incorporation of surfactant ions into the interlayer region. The TG-DTA analyses showed that the total mass losses of OMt strongly depended on the molecular volume of modifiers.

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