Adsorption efficacy of functionalized Cu-BDC MOFs tethered 2-mercaptobenzimidazole analogue: A comparative study. Issue 2 (February 2023)

• Record Type: Journal Article
• Authors: Challa, Malathi; Chinnam, Sampath; Rajanna, Ambika Madalakote; Nandagudi, Apurva; Yallur, Basappa C.; Adimule, Vinayak
• Is Part Of: Heliyon. Volume 9:Issue 2(2023)
• Publication Date: 2023-02
• Subjects: 2-Mercaptobenzimidazole analogue -- Cu-BDC MOFs -- Congo red -- Adsorption; Research -- Periodicals; Medical sciences -- Periodicals; Natural history -- Periodicals; Social sciences -- Periodicals; Earth sciences -- Periodicals; Physical sciences -- Periodicals; 507.2
• DOI: 10.1016/j.heliyon.2023.e13223
• Languages: English
• ISSNs: 2405-8440

Abstract

Abstract: A novel metal-organic framework [MOFs], and 2-[benzo [ d ]thiazol-2-ylthio)-3-hydroxy acrylaldehyde-Cu-benzene dicarboxylic acid was synthesized by solvothermal method and characterized using p -XRD, FSEM-EDX, TGA, BET, FTIR. The tethered organic linker, 2-[benzo [ d ]thiazol-2-ylthio)-3-hydroxyacrylaldehyde was commonly known as 2-mercaptobenimidazole analogue [2-MBIA]. Analysis of BET disclosed that addition of 2-MBIA to Cu-benzene dicarboxylic acid [Cu-BDC], reduced the crystallite size from 70.0 nm to 65.90 nm, surface area from 17.95 to 17.02 m 2 g -1 and enhances the pore size from 5.84 nm with 0.027 cm 3 g -1 pore volume to 8.74 nm with 0.361 cm 3 g -1 pore volume. Batch experiments were conducted to optimize pH, adsorbent dosage, and, Congo red (CR) concentration. The adsorption percentage of CR on the novel MOFs was 54%. Adsorption kinetic studies revealed that the uptake adsorption capacity at equilibrium was 184.7 mg/g from pseudo-first-order kinetics which gave a good fit with the experimental data. Intraparticle diffusion model explained the process of the adsorption mechanism: diffusion from the bulk solution onto the porous surface of the adsorbent. Freundlich and Sips models were the best fit models of the several non-linear isotherm models. Temkin isotherm suggested the adsorption of CR on MOFs was of an exothermic nature.