A rapid production of pure TMA–montmorillonite nanoclay in supercritical water: Study on powder crystallinity and adsorption capacity

Efficient copper removal from wastewater through montmorillonite‐supported hydrogel adsorbent

“…Moreover, the broad peak around 1,043 cm −1 and the minor peak at 1,110 cm −1 can be attributed to the stretching vibration of Si‐O‐Si and Si‐O bonds in montmorillonite structure, respectively. The other functional groups related to this clay mineral are the coupled A1‐O and Si‐O out‐of‐plane (624 cm −1 ), Al‐O‐Si in‐plane (723 cm −1 ), and Al‐O out‐of‐plane (796 cm −1 ) vibrations (Hosseinpour, Ahmadi, Charkhi, & Allahyari, ; Liu et al., ).…”

“…The twodimensional reflection at 19.9° can be ascribed to the integrating result of (0 2) and (1 1) diffraction planes of montmorillonite stacking layers. A weak reflection at 27.6° with (1 0 1) plane and d-spacing of 3.2 Å is attributed to the quartz phase of montmorillonite (Chen et al, 2015;Gobara, Hassan, & Betiha, 2016;Hosseinpour et al, 2014). After incorporating montmorillonite into the matrix of BHA, the characteristic peaks of montmorillonite roughly disappeared; hence, XRD pattern of MHA (Figure 4b) shows no obvious reflection.…”

in vitro Controlled Drug Release of Antidiabetic Metformin HCl from Citric Acid Activated Natural Montmorillonite

“…In the FTIR spectrum of montmorillonite (MMT 0 ), absorption bands at 3626.17 and 3695.61 cm -1 indicate the stretching vibration of the -OH group (Al-OH and Si-OH of octahedral and tetrahedral layers) on the montmorillonite framework [12]. The absorption band at 1631.78 cm -1 indicates the H-O-H bending mode of adsorbed water [17,18]. The appearance of two bands at 1165 cm -1 and 796.6 cm -1 are attributed to asymmetrical stretching vibration and symmetrical stretching vibration of TO 4 (T = Si or Al), respectively [19].…”

The role of supercritical water on the rapid formation of ZSM-5 nanocatalyst

“…The capacity of the reactor was 10 cm 3 , filled up to half of its volume with synthesis solution. In a case of two step procedure, the optimized operational condition before (aging time=120 min, aging temperature= 80 ) and during supercritical condition (reaction time=30 min, reaction temperature= 450 ) was designated according to our previous study where the effect of working parameters was investigated comprehensively [25,33]. In a case of low temperature hydrothermal synthesis method (LTH) reaction temperature and time was adjusted on T= 100 and t= 48 h. (3) After completion of reaction, reactor was immediately cooled and the zeolite products were separated and washed by high-speed centrifugation, dried in ambient, and finally heated in air 500 ℃ for 5 h to assure complete combustion of carbon materials, as well as to remove any organics.…”

“…Schematic sketch of synthesis approach with different temperature programs. The optimum parameters were selected according to our previous study in a case of synthesis in SCW [25,33]. …”