Synthesis and Characterisation of Metal-Organic Frameworks (MOFs) Using Benzene-1, 4- Dicarboxylic Acid as a Linker for Chromium (VI) Adsorption
| International Journal of Applied Chemistry |
| © 2025 by SSRG - IJAC Journal |
| Volume 12 Issue 2 |
| Year of Publication : 2025 |
| Authors : Maduelosi Ngozi Jane, Bull Okpara Sergeant, Amadi Chisom Ahunna |
10.14445/23939133/IJAC-V12I2P102
How to Cite?
Maduelosi Ngozi Jane, Bull Okpara Sergeant, Amadi Chisom Ahunna, "Synthesis and Characterisation of Metal-Organic Frameworks (MOFs) Using Benzene-1, 4- Dicarboxylic Acid as a Linker for Chromium (VI) Adsorption," SSRG International Journal of Applied Chemistry, vol. 12, no. 2, pp. 5-12, 2025. Crossref, https://doi.org/10.14445/23939133/IJAC-V12I2P102
Abstract:
Metal-organic frameworks (MOFs) applied in adsorption processes have shown appreciable effectiveness for removing dissolved ions. This study studied the adsorption rates of chromium (VI) ions by synthesised MOFs (metal-organic framework) using batch adsorption methods. The Na-MOF, Zn-MOF, and Mg-MOF were synthesised solvothermal from the reaction of sodium, zinc and magnesium nitrate salt with Benzene-1, 4- dicarboxylic acid, respectively, to yield the adsorbents. The synthesised adsorbents, Na-MOF, Zn-MOF, and Mg-MOF, were named RSU-1, RSU-2 & RSU-3, respectively. The results showed that the synthesised adsorbents exhibited good adsorption rates at distinct capacities. The BET values reflecting the surface areas of the synthesised adsorbents, RSU-1, RSU-2 and RSU-3, are 371.958 m2/g, 404.248 m2/g, and 547.372 m2/g, respectively. Adsorption rates were observed to increase as pH, concentration of chromium (VI) ion and contact time increased. The increase in adsorption as the pH tended to alkalinity (pH 2-pH 10) was from 2,240 mg/g to 19,580 mg/g for RSU-1, 1,550 mg/g to 14,110 mg/g for RSU-2, and 8,940 mg/g to 15,900 mg/g for RSU-3 adsorbents. Maximum Adsorption capacity was observed at pH 10, adsorbate concentration of 100 mg/l and contact time of 10,800sec. Increase in contact time from 3600 10,800sec increased adsorption rate from 3,340 mg/g to 7,242 mg/g for RSU-1; 6,155 mg/g to 9,972 mg/g for RSU-2; and 3,750 to 4,880 mg/g for RSU-3. As concentration increased from 10-100 mg/l, there was an increase in adsorption capacities from 923.7 mg/g to 10,121 mg/g for RSU-1, 1,650 mg/g to 10,570 mg/g for RSU-2, and 967.0 mg/g to 11,873 mg/g for RSU-3. The rate of percentage removal of the adsorbates was in the order of RSU-1> RSU-3> RSU-2. The order is attributed to the effect of the ionic size of the adsorbents. Isotherm data fitted suitably with the Freundlich model, thus suggesting good adsorption from the solution. The kinetic model was found to have fitted the pseudo-second-order model, suggesting chemisorption for the synthesised adsorbents. The metal-organic framework can be effectively employed as an adsorbent for an enhanced adsorption capacity of dissolved ions on the premises of its large surface area.
Keywords:
Metal-Organic Frameworks, MOFs, Benzene-1, 4- Dicarboxylic Acid, Adsorption.
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