Synthesis of MCM-41/ZIF-67 Composite for Enhanced Adsorptive Removal of Methyl Orange in Aqueous Solution

Abstract

ZIF-67 and MCM-41/ZIF-67 composites were successfully synthesized with water solvent at room temperature. The amounts of MCM-41 added during synthesis were varied at 2.5, 5 and 10 (%w/w) toward the amount of ZIF-67, and the obtained solids were denoted as MC (2.5)/ZIF-67, MC (5)/ZIF-67, and MC (10)/ ZIF-67, respectively. The X-ray diffraction (XRD) patterns of ZIF-67 and the composites showed characteristic peaks at 2θ of 7.32, 10.36, 12.69, 14.66, and 16.40°, similar to that of reported ZIF-67. The Fourier transform infra-red (FT-IR) spectra of all solids showed absorption bands at the same wavenumbers as reported for ZIF-67. The results of surface morphology analysis using scanning electron microscope (SEM) have shown that ZIF-67 and the composites have a cube shape, which is characteristic for the ZIF-67 standard. N 2 adsorption-desorption data showed that the specific surface area of ZIF-67 and MC (5)/ZIF-67 were 1079.2 and 1011.2 m 2 /g, respectively, lower than that of MC (10)/ZIF-67 (1250.6 m 2 /g). However, results of thermal gravimetric analysis (TGA) showed that the thermal stability of MC (10)/ZIF-67 reached 357°C, higher than that of ZIF-67 (325°C). Performance of the composites as adsorbent of methyl orange (MO) in aqueous solution showed that the MC (5)/ZIF-67 had the highest adsorption capacity of 167.635 mg/g, and followed the pseudosecond-order adsorption kinetics and Langmuir isothermal adsorption.

Optimized Fabrication of Bimetallic ZnCo Metal–Organic Framework at NiCo-Layered Double Hydroxides for Multiple Storage and Capability Synergy All-Solid-State Supercapacitors

“…On the other side, the absorption bands at 1142 and 992 cm −1 illustrate the stretching and bending vibrations of the C−N bond in the aromatic 1,3-diazole ring, respectively. 41 In addition, the stretching vibration of the C�N is demonstrated by the peak at 1564 cm −1 , while the absorption bands at 1636 and 1653 cm −1 verify the bending vibrations of the water molecules and N−H bond, respectively. 38,42 However, the absorption peak at 2184 cm −1 is attributed to the stretching vibration of OCN − resulting from the decomposition of urea.…”

“…Moreover, the two sharp bands located at 693 and 754 cm –1 are related to the out-of-plane bending of the imidazole ring, whereas the intercalation of the CO 3 2– and NO 3 – anions within the NiCo-LDH structure can be identified from the absorption bands at 831 and 1384 cm –1 , respectively. , It is worth noting that the intercalation of anions such as NO 3 – and CO 3 2– should enhance the overall porosity of the surface and augment the contact area between the electrolyte and the electrodes’ surface, respectively. , This intercalation results in boosting the entire electrochemical performance for the material. On the other side, the absorption bands at 1142 and 992 cm –1 illustrate the stretching and bending vibrations of the C–N bond in the aromatic 1,3-diazole ring, respectively . In addition, the stretching vibration of the CN is demonstrated by the peak at 1564 cm –1 , while the absorption bands at 1636 and 1653 cm –1 verify the bending vibrations of the water molecules and N–H bond, respectively. , However, the absorption peak at 2184 cm –1 is attributed to the stretching vibration of OCN – resulting from the decomposition of urea .…”

Enhancing Hydrogen Sulfide Detection at Room Temperature Using ZIF-67-Chitosan Membrane

“…The band at 751 cm −1 is assigned to the C=N stretching vibration, whereas the band at 1300 cm −1 corresponds to C=C stretching [ 15 , 38 ]. The band at 1415 cm −1 is attributed to CH 3 bending vibration [ 39 ].…”

“…Figure 4 b shows the FTIR analysis of the doped membrane. The spectra show vibrational modes of C–H bending at 658 cm −1 , C–O stretching at 1158 cm −1 and 1654 cm −1 , CH 3 bending at 1414 cm −1 [ 38 ], a dimer OH at 2877 cm −1 , and a C=C stretching mode at 1330 cm −1 [ 15 , 19 , 39 , 52 ]. The membrane showed relative peaks of ZIF-67 and CS [ 52 ], denoting the incorporation of ZIF-67 into the matrix.…”

“…Conventionally, ZIF-67 has not been used to detect H 2 S gas [ 13 , 27 , 28 ] but rather other VOC gases [ 27 , 28 , 29 , 30 , 31 , 32 ] and inorganic gases [ 33 , 34 , 35 ]. It has also been used in water purification [ 15 , 36 , 37 , 38 , 39 ] CO 2 detection and separation [ 14 , 40 , 41 , 42 , 43 ], organic dyes [ 19 , 36 , 44 ], electrochemical sensors [ 16 , 45 , 46 ], and energy applications [ 23 , 47 , 48 ]. To the best of our knowledge, ZIF-67 has not been reported in combination with CS for H 2 S gas detection applications.…”