Development Of Modified Mof-5 Towards Enhancing Malachite Green Dye Removal From Aqueous Solution

• Main Author: Oh, Hong Keat
• Format: Monograph
• Language: English
• Published: Universiti Sains Malaysia 2022
• Subjects: T Technology; TP155-156 Chemical engineering
• Online Access: http://eprints.usm.my/55592/1/Development%20Of%20Modified%20Mof-5%20Towards%20Enhancing%20Malachite%20Green%20Dye%20Removal%20From%20Aqueous%20Solution.pdf; http://eprints.usm.my/55592/

The synthesis of MOF-5 and its modification have been investigated for malachite green dye removal. The modified MOF-5 adsorbents have been prepared using rice husk ash (obtained from rice husk burning at various temperatures) and coal fly ash at different ratios. The adsorbents are prepared and characterised using X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscope with energy dispersive X-ray spectroscopy, and Brunauer-Emmett-Teller analysis. From the preliminary test, the MOF-5/RHA&CFA/2:1 has been chosen as the best adsorbent for malachite green dye removal from the aqueous solutions. Several factors, like initial dye concentration, shaking rate, temperature, solution pH, amount of adsorbent, and contact time, were the important operating parameters that must be optimised. In this study, at 150 mg/L initial MG dye concentration, 300 rpm shaking rate, 40 °C, 11.5 for solution pH value, 0.2 g/100 mL of the adsorbent amount per solution volume, and 4 hours of contact time. Furthermore, adsorption isotherms and kinetics studies indicated that Langmuir isotherm and pseudo-second-order kinetic models provide the best modelling behaviours for MG adsorption onto the best-performed adsorbent. The BET analysis indicates that the BET surface area has no relationship with the MG dye adsorption efficiency.