Experimental design optimization and isotherm modeling for removal of copper(II) by calcium‐terephthalate MOF synthesized from recycled PET waste

Abstract

In this research, a calcium-terephthalate metal-organic framework ([Ca(BDC) (H 2 O) 3 ]) was synthesized by a new high yield solvothermal method as an efficient adsorbent. Terephthalate ligand recovered from polyethylene terephthalate (PET) waste was used as a precursor in the synthesis process. The adsorption ability of this compound to remove copper(II) from aqueous solutions was investigated. Experimental designs involving Plackett-Burman and Doehlert designs were used for the optimization of the adsorption process. Plackett-Burman design was used for screening the effective factors such as pH, adsorbent dosage, and initial concentration of Cu(II). Running Doehlert design (DD) as an optimization approach led to find a model for relation between response and effective factors and maximized uptake capacity (q) of Cu(II) (q = 351.3 mgg À1 ) under optimum conditions (pH = 5, adsorbent dosage = 1.50 mg and initial concentration of Cu(II) = 150 mgL À1 ). Infrared spectroscopy (FTIR), X-ray diffraction (XRD), energy-dispersive X-ray (EDX), and field-emission scanning electron microscopy (FESEM) analyses were applied to investigate the chemical and crystal structure of [Ca(BDC)(H 2 O) 3 ]. Furthermore, kinetics, isotherms, thermodynamics, and desorption studies are complementary divisions of this research.

Synthesis of strong magnetic response ZIF-67 for rapid adsorption of Cu2+

“…Based on previous research literature, we preliminarily determined to complete the experiment at room temperature in the adsorption parameters. In addition, the pH value of the initial solution is adjusted to 5 with acetic acid for adsorption because the adsorption effect under this condition is usually the best ( Zolgharnein et al, 2022 ). For this reason, we mainly explored the influence of adsorption time, adsorbent dosage, and initial concentration on the adsorption process.…”

Artificial neural network (ANN) modeling for simultaneous removal of a binary mixture of Pb(II) and Cu(II) by cobalt hydroxide nano‐flakes

“…Technologies such as chemical precipitation, electro‐deposition, reduction, neutralization, reverse osmosis, solvent extraction, ion exchange, and adsorption are available to remove metallic pollutants from water and wastewater 1–4 . Among the different treatments described above, adsorption technology with no chemical degradation is attractive due to its merits of effectiveness, efficiency, and economy 5–7 . The adsorption process has been extensively examined to eliminate organic substances or heavy metal ions from water and wastewater 1–7 .…”

“…[1][2][3][4] Among the different treatments described above, adsorption technology with no chemical degradation is attractive due to its merits of effectiveness, efficiency, and economy. [5][6][7] The adsorption process has been extensively examined to eliminate organic substances or heavy metal ions from water and wastewater. [1][2][3][4][5][6][7] The most common adsorbents are porous materials, such as activated carbon, quartz, activated alumina, zeolite, and metal organic framework (MOF).…”

“…[5][6][7] The adsorption process has been extensively examined to eliminate organic substances or heavy metal ions from water and wastewater. [1][2][3][4][5][6][7] The most common adsorbents are porous materials, such as activated carbon, quartz, activated alumina, zeolite, and metal organic framework (MOF). 5,6 The porous property of adsorbents can typically provide a large specific surface area.…”

“…[1][2][3][4][5][6][7] The most common adsorbents are porous materials, such as activated carbon, quartz, activated alumina, zeolite, and metal organic framework (MOF). 5,6 The porous property of adsorbents can typically provide a large specific surface area. The development of nanotechnology at the end of the 20th century has widened the variety of adsorbents.…”