Well-constructed approach of exceptionally water-stable (mesoporous SiO₂)-on-(microporous Cu-BTC) composite for efficient methylene blue capture

Abstract

Cationic methylene blue (MB) capture with classical Cu-BTC is definitely restricted and challenged by its water instability issue. Thus the structural stability of Cu-BTC in presence of moisture is a...

Fe3O4@ZIF-8@SiO2 Core–Shell Nanoparticles for the Removal of Pyrethroid Insecticides from Water

“…The pseudo-second-order model (eq S2) assumes that the adsorption rate is regulated by chemical interactions . The Dumwald–Wagner (eq S3) and Weber–Morris intraparticle diffusion models (eq S4) are used to study and describe the channel diffusion and rate control steps during adsorption. , The formulas for the four adsorption kinetic models are given in the Supporting Information.…”

“…Obviously, the coefficient of determination ( R 2 ) of the pseudo-second-order model is higher than those of the other models, implying that chemisorption is the major rate-limiting step, which can include sharing of electrons and π–π stacking interactions. Additionally, the Dumwald–Wagner model has a high R 2 , probably because of the mesoporous structure of SiO 2 in the composite nanoparticles . Moreover, the Weber–Morris intraparticle diffusion model was used to study the diffusion mechanism and primary rate-controlling steps.…”

“…Additionally, the Dumwald−Wagner model has a high R 2 , probably because of the mesoporous structure of SiO 2 in the composite nanoparticles. 60 Moreover, the Weber−Morris intraparticle diffusion model was used to study the diffusion mechanism and primary rate-controlling steps. Figure 5D shows that each pyrethroid insecticide has three linear fitting curves, indicating the presence of three adsorption stages, and the intraparticle diffusion constants in these three stages follow the order of K 1 > K 2 > K 3 .…”

Well-constructed a water stable Cu-BTC@TpPa-1 binary composite with excellent capture ability toward malachite green

“…Through comparing and observing the XRD pattern of Fig. 3(a), Cu-BTC has characteristic diffraction peaks at (220), ( 222), (400), (422), (333), (440), and (422), corresponding to the references (Dong et al, 2022). Material Studio 7.0 was also explored by us to simulate the theoretical XRD graphs of the samples.…”

Adsorptive removal of tetracycline and methylene blue from aqueous solution with a water resistance copper-based metal–organic framework

“…23,24 The coordination bonds of Cu 2+ and BTC are very likely destroyed by coming in contact with water molecules, causing an irreversible collapse. 25 Li et al studied the adsorption performance of Cu-BTC from the dibenzothiophene/isooctane model oil system of water-bearing molecules and found that when the water content was 4 wt%, the pore structure of the material collapsed rapidly, and the adsorption capacity was reduced by 86%. 26 Some strategies have been investigated to boost the water stability of Cu-BTC through grafting hydrophobic groups, wrapping with hydrophobic film, doping with carbon, etc.…”