Enhanced removal of soluble and insoluble dyes over hierarchical zeolites: Effect of synthesis condition

• Main Authors: Ani Iryani, Ani Iryani, Ahmad Masudi, Ahmad Masudi, Rozafia, Ade I., Hartanto, Djoko, Santoso, Mardi, Hadi Nur, Hadi Nur, Azami, Mohammad S.
• Format: Article
• Language: English
• Published: MDPI AG 2020
• Subjects: QD Chemistry
• Online Access: http://eprints.utm.my/id/eprint/90420/1/HadiNur2020_EnhancedRemovalofSolubleandInsolubleDyes.pdf; http://eprints.utm.my/id/eprint/90420/; http://dx.doi.org/10.3390/INORGANICS8090052
• Institution: Universiti Teknologi Malaysia

A hierarchical zeolite ZSM-5 with micro and meso-pore was prepared by optimising the most affecting parameter in sequence of desilication and dealumination. The physicochemical properties of zeolite were characterised with XRD, nitrogen adsorption-desorption, FTIR and SEM. The potential of this zeolite for decolorisation of CR, RY, MB, RhB, DB-1 and DB-14 was evaluated with adsorption isotherm, thermodynamics, kinetics, and influencing parameter for adsorption. The unique modification of ZSM-5 resulted in lower crystallinity, easier porosity control, rich terminal silanol and unbridged silanol groups which assisted in higher adsorption capacity. The adsorption capacity of the optimum ZSM-5 was 323, 435, 589, 625, 61 and 244 mg/g for CR, RY, MB, RhB, DB-1 and DB-14, respectively. The dye adsorption progressed through pseudo-first-order kinetic and close to the Langmuir model. The adsorption mechanism is proposed mainly through interaction between deprotonated silanol site and the electron-rich dye site.