Novel aspartic-based bio-MOF adsorbent for effective anionic dye decontamination from polluted water

• Published in: RSC advances 2022-06, Vol.12 (29), p.18363-18372
• Main Authors: Salama, Eslam, Ghanim, Mohamed, Hassan, Hassan Shokry, Amer, Wael A, Ebeid, El-Zeiny M, El-Shazly, Ahmed H, Ossman, Mona, Elkady, Marwa F
• Format: Article
• Language: English
• Subjects: Adsorbents; Adsorption; Aqueous solutions; Aspartic acid; Chemistry; Decontamination; Dyes; Electron microscopy; Emission analysis; Field emission microscopy; Fourier transforms; Gravimetric analysis; Metal-organic frameworks; Microscopy; Sorbents; Stability; Surface area; Surface chemistry; Water purification; Zinc
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/d2ra02333d

In this study, a cost-effective powdered Zn l -aspartic acid bio-metal organic framework (Zn l -Asp bio-MOF) was reported as an efficient adsorbent for Direct Red 81 (DR-81) as an anionic organic dye. The prepared bio-MOF was characterized using Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), field emission transmission electron microscopy (FETEM), surface area analysis (BET), and thermal gravimetrical analysis (TGA). The resulting bio-MOF has a large surface area (180.43 m 2 g −1 ) and large mesopore volume (0.144 cm 3 g −1 ), as well as good chemical inertness and mechanical stability. The optimum dosage from the Zn l -Asp bio-MOF was 1.0 g L −1 at pH = 7 for 95.3% adsorption of 10 ppm DR-81 after 45 min. Thermodynamic analysis results demonstrated that the decontamination processes were done with spontaneous, thermodynamically, and exothermic nature onto the fabricated bio-MOF. Kinetic parameters were well-fitted with pseudo-second-order kinetics, and the adsorption process was described by the Freundlich isotherm. The adsorption data proved that Zn l -Asp bio-MOF is an effective adsorbent for DR-81 from aqueous solutions with high stability and recycling ability for eight cycles, as well as the easy regeneration of the sorbent. In this study, a cost-effective powdered Zn l -aspartic acid bio-metal organic framework (Zn l -Asp bio-MOF) was reported as an efficient adsorbent for Direct Red 81 (DR-81) as an anionic organic dye.