Optimization of Congo red dye adsorption from wastewater by a modified commercial zeolite catalyst using response surface modeling approach

• DOI: 10.2166/wst.2021.078
• Publication Date: 2021-02-23T08:13:53Z
• Authors: Intisar Hussain K...; Farah Talib Al-Su...; Adnan A. AbdulRazak; Tahani Aldahri; Sohrab Rohani
• Keywords: Congo red; Langmuir adsorption model

Abstract In the present work, Zeolite A was modified by using hexadecyltrimethylammonium bromide (HDTMABr) for adsorption of Congo red (CR) dye from synthetic aqueous solutions. The Modified (MZA) characterized XRD, SEM, and FTIR. influence solution pH (in 4–12 range), ionic strength (0.1–1 M), contact time (180 min), initial CR concentration (20–60 mg/L), temperature (24–36 °C), an adsorbent dose (1–3 g m/L) on % removal capacity were studied. combined effect MZA also studied applying response surface methodology (RSM). Experimental values in a good agreement with those predicated second-order quartic model. maximum 99.24% 21.11 mg/g achieved under following conditions: = 7, 60 mg/L, 24 °C, 0.1 M, 3 g/L 90 min time. equilibrium data subjected to Langmuir, Freundlich Temkin isotherms, latter providing best fit while kinetic studies conducted three models. results indicated that process described pseudo-second-order study demonstrates can be utilized highly efficient removal.