Preparation and characterization of ZIF-8 and ZIF-67 engineered PVDF mixed-matrix membranes: stability enhancement in pervaporation study

Abstract

In this work, mono-(ZIF-8 and ZIF-67) and bi-metallic (ZIF-8-67) metal-organic frameworks (MOFs) are prepared using the sol-gel method. The prepared MOFs are successfully applied to prepare a mixed-matrix membrane. The...

Selective Detection of NH3 Gas by Ti3C2Tx Sensors with the PVDF-ZIF-67 Overlayer at Room Temperature

“…In Figure a–c, it is evident that the sensing response of the Ti 3 C 2 T x sensor without a filter decreased with increasing RH. This decline is attributed to active sites on the MXene surface being adsorbed by polar water molecules, hindering NH 3 adsorption and suppressing response growth. , Conversely, the Ti 3 C 2 T x sensor with the MMM filter exhibited minimal change in response, affirming the stability enhancement provided by the hydrophobic nature of PVDF Figure S7a,b illustrates the dynamic sensing response under varying RH conditions under 25 ppm of NH 3 gas.…”

“…The Ti 3 C 2 T x sensor without a filter demonstrated an SC RH of 1.34 ppm/15% RH, while the Ti 3 C 2 T x sensor with the MMM filter exhibited a significantly lower SC RH of 0.034 ppm/15% RH. This underscores the effective prevention of water molecule interaction with the Ti 3 C 2 T x MXene surface by the MMM filter, attributed to the hydrophobic nature of the PVDF membrane . In Figure a–c, it is evident that the sensing response of the Ti 3 C 2 T x sensor without a filter decreased with increasing RH.…”

“…In the development of Ti 3 C 2 T x sensors toward improving the selectivity, our initial focus was on assessing selectivity to optimize the incorporation of ZIF-67 within a PVDF matrix, forming MMM. Pure PVDF, characterized by its dense polymer structure, exhibited pores in its cross-section, thereby enabling the passage of various gases and vapors through a solution diffusion mechanism toward Ti 3 C 2 T x sensors. To enhance selectivity for NH 3 gas, ZIF-67 was introduced, a zeolite known for its selective adsorption properties toward NH 3 gas .…”

Efficient Dye Extraction from Wastewater Using Indium-MOF-Immobilized Polyvinylidene Fluoride Membranes with Selective Filtration for Enhanced Remediation

“…In addition, the major peaks at 18.4, 20.6, and 26.7°represent the α and β phases of PVDF. 63 The morphology of the In-MOF@PVDF membranes (M 1 to M 4 ) was examined using scanning electron microscopy (SEM), as shown in Figure 3. The SEM images reveal that as the In- MOF doping percentage increases, there is a corresponding increase in the formation of pores (Figure 3A).…”

“…Furthermore, the presence of planes corresponding to the In-MOF at 10.45 (101), 13.86 (040), 16.89 (242), 18.87 (512), and 20.73 ° (060) indicates that the crystal structure of the In-MOF within the membrane remains intact. In addition, the major peaks at 18.4, 20.6, and 26.7° represent the α and β phases of PVDF …”