S. Alibakhshi et al 321 Determination of optimum amounts of effective parameters in reactive dyes removal Using a zeolitic-imidazolate framework catalyst. Shabnam Alibakhshi 1 , Ashraf S. Shahvelayati 1* , Maryam Ranjbar 2* , Shabnam Sheshmani 1, Saeid Souzangarzadeh 1 1 Department of Chemistry, College of Basic Sciences, Yadegar-e- Imam Khomeini (RAH) Shahre Ray Branch, Islamic Azad University, Tehran, Iran 2 Department of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST), Tehran, Iran Received: 2022-06-20 Accepted: 2022-8-23 Published: 2022-9-16 ABSTRACT An efficient and rapid fabrication procedure for ZIF-8 crystals through ultrasonic assisted strategy (30min) was reported. Additionally, the crystallinity, morphology, chemical bonding, and porosity of ZIF-8 were fully characterized by XRD, and FT-IR. The Response surface methodology approach was established to optimize a series of adsorption conditions: initial concentration (10–400 mg/L), dose (0.02–1 g/L), and time (20–60 min) for Red 141 and Violet-5r removals. Particularly, plausible adsorption mechanisms (electrostatic interactions and π–π stacking) were elucidated, and isotherm models were rigorously studied by three-parameter equations (Langmuir, Freundlich, Tempkin). The adsorption isotherm data showed the adsorption of reactive dyes by ZIF-8, was consistent with the Langmuir isotherm model. The kinetics parameters were in accord with the pseudo-second-order equation, which implied that the adsorption rate was mainly controlled by the chemisorption mechanism. Through advantageous effectiveness involving good reusability (4 recycles), and maximum adsorption capacities (250-200 mg/g), it is recommendable to utilize ZIF-8 as a good adsorbent for the dyes remediation. Keywords: Zeolitic-imidazolate frameworks, dyes remediation, response surface methodology, electrostatic interactions. International Journal of New Chemistry Published online 2023 in http://www.ijnc.ir/. Open Access Print ISSN: 2645-7236 Online ISSN: 2383-188x Original Research Article , avelayati@yahoo.com Corresponding Author: Ashraf Shahvelayati email: * Maryam Ranjbar: email: marandjbar@irost.ir .Int. J. New. Chem., 2022, Vol. 9, Issue 4, pp.321-335