Application of a new metal-organic framework of [Ni 2 F 2 (4,4'-bipy) 2 (H 2 O) 2 ](VO 3 ) 2 .8H 2 O as an efficient adsorbent for removal of Congo red dye using experimental design optimization

• Published in: Environmental research 2020-03, Vol.182, p.109054
• Main Authors: Zolgharnein, Javad, Dermanaki Farahani, Saeideh, Bagtash, Maryam, Amani, Saeid
• Format: Article
• Language: English
• ISSN: 1096-0953
• DOI: 10.1016/j.envres.2019.109054

The new metal-organic framework of [Ni F (4,4'-bipy) (H O) ](VO ) .8H O was synthesized by a sonochemical method for the adsorptive removal of Congo red (CR) in a batch system. It was characterized by infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FESEM), thermogravimetric (TGA), and elemental analyses. Box-Behnken design (BBD) was applied to obtain an appropriate regression model for removal percent (R%) of CR dye. The optimized conditions for three effective factors: adsorbent dosage, temperature, and CR concentration were m = 0.0107 g, T = 45 °C, and C  = 50 mg.L respectively, while maximum removal percent is 96%. Langmuir isotherm shows that the maximum monolayer adsorption capacity (q ) is 242.1 mg.g . The pseudo-second-order kinetic model better describes the adsorption kinetics behavior. Thermodynamic parameters illustrate that the adsorption process is endothermic and spontaneous chemisorption. The aim of this study is the introduction of a new metal-organic framework that can adsorb Congo red with high adsorption capacity. Therefore, due to synthesis of the new metal-organic framework as a high efficient adsorbent for Congo red removal, and also multivariate optimization of removal conditions, this study outright is novel.