A Novel Synthesis of MIL 53 (Al)@SiO2: An Integrated Photo Catalyst Adsorbent to Remove Bisphenol A from Wastewater
An integrated methodology is formulated for treating the bisphenol A containing effluents that include its adsorption using a newly synthesized MIL 53 (Al)@SiO2, followed by the photo-catalytic degradation. The PL spectroscopy proved the introduction of SiO2 in the conventional form of MIL 53 (Al) is proposed to resists the hole and electron recombination. The novel metal organic framework (MOF) composite is synthesized using the coal fly ash and waste aluminium foil through the solvothermal method. The fabricated composite was characterized for ensuring the improved physical and chemical properties as compared to that of raw fly ash, including (i) a large increase in surface area from 2 m2 g-1 to 667.802 m2 g-1, (ii) the enhancement in pore volume from 0.00518 cc g-1 to 0.466 cc g-1, (iii) conversion of pore structure from ink bottle structure to slit-type structure, (iv) change in crystallinity, (v) addition of –C=O and C-H stretching on the surface and (vi) change in topology from spherical to nano-rod structure. The synthesized MIL 53 (Al)@SiO2 shows a monolayer adsorption process influenced by both physical and chemical adsorption. The maximum adsorption capacity was obtained to be 134.6764 mg g-1 that is several folds greater than that of raw fly ash. On the other hand, the photocatalysis degrades maximum 85.04% of bisphenol A satisfying the first order reaction kinetic model. With the excellent performance of the synthesized material in removing the respective pollutant, this is proposed as a potential adsorbent cum photo-catalyst for the treatment of wastewater effluents.