The present study aims at investigating sonochemically synthesized MIL-53(Al) and its applications in adsorption lead ions from aqueous solution. XRD, FESEM, BET, and FTIR analyses were employed to identify and characterize MIL-53(Al). The ultrasonic-assisted synthesis procedure results in reducing the synthesis time to 24 h; however, the conventional synthesis of MIL-53(Al) takes 3 days. Applying ultrasonic waves also leads to increase of the specific surface area up to 50% more than that of synthesized by the conventional method, as well as creating the hierarchical MIL-53(Al) structure which reduces the mass transfer limitation of ions into internal micropores. The optimum conditions for removing lead ions are pH of 6, Pb+2 ion concentration of 20 mg/L, contact time of 60 min, adsorbent dose of 0.04 g, and temperature of 318 K with the removal efficiency of 97.63%. The experimental adsorption equilibrium and kinetic data fit the Langmuir isotherm and pseudo-second-order kinetic models, respectively. Moreover, the usage of sonochemically synthesized MIL-53(Al), for the first time as an adsorbent in heavy metal removal points to the great potential of this new environmentally-friendly adsorbent in removing lead ions from aqueous solutions
The present study aims to investigate novel ultrasonic synthesized MIL-53(Al) and its applications in adsorption. Both conventional and ultrasonic methods were used to synthesized Mil-53(Al). The ultrasonic-assisted synthesis procedure results in reducing synthesis time to 24 hours; however, Compared to that conventional method takes 3 days to create the framework. Applying ultrasonic waves also increases surface area to 50% more than the ones synthesized by the conventional method, as well as creating the hierarchical MIL-53(Al) structure (meso- and micro-) pores. To this end, XRD, FESEM, BET, and FTIR analyses were employed to identify and characterize MIL-53(Al). The unique structure and high MIL-53(Al) yield lead to effective adsorption among MOF and lead ions. The optimum conditions for removing lead were 6.0 pH, 20 mg/l concentration, 60.0 min contact time, 0.04g adsorbent dose, and 318k temperature with 97.63% removal of the lead ions. The experimental adsorption equilibrium and kinetic data fitted the Langmuir isotherm and pseudo-second-order kinetic models, respectively. Moreover, the use of ultrasonic synthesized MIL-53(Al), for the first time as a novel adsorbent in heavy metal removal, pointed to the great potential of this new environmentally-friendly adsorbent in removing lead ions from aqueous solutions.
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