Evaluating the efficiency of zeolitic imidazolate framework-67(ZIF-67) in elimination of arsenate from aqueous media by response surface methodology
Morteza Khalooei, Masoomeh Torabideh, Ahmad Rajabizadeh, Sedigheh Zeinali, Hossein Abdipour, Awais Ahmad, Gholamreza Parsaseresht
Abstract
• The optimal conditions are pH = 6, contact time = 55 min, adsorbent dose = 0.58 g/L. • The effects of various parameters, were examined. • Response surface methodology was used to optimize the process. • The adsorption isotherm follows the Langmuir model (R 2 = 0.99). In this work, a laboratory examination of the effectiveness of the metal–organic framework ZIF-67 for the elimination of arsenate from aqueous media was evaluated. The properties of the adsorbent were specified by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and Fourier transform infrared spectroscopy (FTIR) methods. The impact of various factors like a temperature (25–65 °C), elimination time (5–85 min), pH (2–10), initial content of arsenic (2–10 mg/L), and adsorbent content (0.1–0.9 g/L) was checked. Central Composite Design (CCD) model was utilized to optimize the process. This study showed that the optimal conditions for arsenic elimination are pH level = 6, contact time = 55 min, temperature degree = 47 °C, adsorbent content = 0.58 g/L, and initial content = 5 mg/L. The highest uptake capacity of arsenate was 62.98 mg/g, The experimental findings indicated that the uptake isotherm adheres to the Langmuir model, with an R 2 level of 0.99. Additionally, the kinetic studies were successfully modeled using a pseudo-second-order approach, achieving an R 2 = 1. Overall, this study illustrates that the efficiency of the metal–organic framework ZIF-67 in eliminating arsenate from aqueous solutions is promising.