Nanosol precursor as structural promoter for clinoptilolite via hydrothermal synthesis and resulting effects on selective adsorption of CH4 and N2

One-step synthesis of hydrophobic clinoptilolite modified by silanization for the degradation of crystal violet dye in aqueous solution

“…An early report from Satokawa and Itabashi 7 detailed using a "seed" method to synthesize CP, then, Chi and Sand 8 systemically demonstrated the synthesis parameters with a large amount of additive seeds (1-10 wt%) at 120-200 C for 1-7 days. Recently, Sun et al 9,10 synthesized highly-pure CP using aluminosilicatecontaining sol as a structure guiding agent at 150 C for 3 days.…”

A nanoprecursor method for successfully synthesizing clinoptilolite with high-crystallinity and resultant effects on CO2/CH4 selective adsorption

“…1A-c), which can be used as an efficient "seeds" preliminarily. 16 Correspondingly, Fig. 1B-a and -b show SEM micrographs, which revealed that the amorphous particles of sol-SP increased in size from 100 to 300 nm with the extension of pre-crystallization time of 6-60 h. While, the obvious CP particles with sheet stacked structures were obtained from sol-SP aer crystallization for 102 h (Fig.…”

Synthesis and Characterizations of High Crystallized Clinoptilolite by Structure Directing Agent Method and its Crystallization Kinetics

“…Due to special HEU structure, the synthetic CP after cation‐exchange could improve its gas separation ability. For example, the separation coefficient was about 2.2 for Li + ‐CP at 298 K and 1 bar, [35] 3.2 for Ca 2+ ‐CP, [48] and 6.8 for Ag + ‐CP, [49] respectively. These results demonstrate that the synthetic CP may be a promising candidate for CH 4 /N 2 separation.Conclusions…”

“…In summary, E n value during the crystallization process is much larger than the E g value, indicating that the induction period is the main control process during the crystallization process. [35] These results indicate that the nucleation rate in the synthesis of CP by the SDA method is relatively slow, implying that it is difficult to form stable crystal nucleus in the synthesis system. [24] Therefore, a properly increased temperature is helpful to accelerate the nucleation rate of CP, but excessively high temperature easily leads to the formation of impurity phases.…”

“…After additive SDA, the synthesized CP was calculated for crystallization kinetics [34] . As shown in Figure 3, the crystallization process was mainly composed of three different regions: [35] induction period (the time elapsed to reach a relative crystallinity of about 10 % was defined as the induction time ( t 0 ), which mainly involves the nucleation process of crystals); The growth period (growth time ( t g ) was defined as the difference between the elapsed time to reach a constant crystallinity and the induction time); The stable period (mainly including the slow growth process of crystals).…”