Carboxymethyl-imidazolium O-vanillin Schiff base grafted into NH2-tagged MIL-101 (Cr) for effective removal of cupric ions from aqueous effluents

• Published in: Environmental science and pollution research international 2024-06, Vol.31 (26), p.38180-38195
• Main Authors: Rizk, Moustafa A., Yahya, Rana, Alsaiari, Raiedhah A., Alsaiari, Mabkhoot A., Shahat, Ahmed, Elshaarawy, Reda F. M.
• Format: Article
• Language: English
• Subjects: Adsorbents; Adsorption; Aquatic Pollution; Aqueous solutions; Atmospheric Protection/Air Quality Control/Air Pollution; Chemistry; Chromium; Cupric ions; Earth and Environmental Science; Ecotoxicology; Efficiency; Effluents; Environment; Environmental Chemistry; Environmental Health; Environmental science; Imines; Infertility; Ion adsorption; Ion concentration; Metal concentrations; Metal ions; Pollution; R&D; Research & development; Research Article; Sustainability; Toxicity; Vanillin; Waste Water Technology; Water Management; Water Pollution Control; Water treatment
• ISSN: 1614-7499; 0944-1344; 1614-7499
• DOI: 10.1007/s11356-024-33663-6

A novel adsorbent (MIL-CMIVSB) was fabricated by modification of H 2 N-MIL-101(Cr) with carboxymethyl-imidazolium O -vanillin Schiff base. The MIL-CMIVSB’s physicochemical characteristics were examined using the pertinent characterization methods. NH 2 -MIL-101(Cr) has a BET surface area of 1492.4 m 2 g −1 , while MIL-CMIVSB adsorbent had 1278.7 m 2 g −1 . Batch adsorption experiments examined the MIL-CMIVSB’s cupric ion adsorption capacity from aqueous solutions at different adsorbent doses (0.1–3 mg), pH (2.0–10.0), contact times (0–240 min), metal ion initial concentrations (10–300 mg/L), and temperatures (298–308 K). The optimum conditions were 1 mg/mL of MIL-CMIVSB adsorbent, 46 min adsorption time, pH 7, 100 ppm initial cupric ion concentration, and 303 K temperature. MIL-CMIVSB effectively and selectively removes cupric ions with an adsorption capability of 359.05 ± 12.06 mg/g. The nonlinear Liu isotherm governed Cu(II) sorption performance on MIL-CMIVSB ( K L  = 0.257 ± 0.01 mg/g, R 2  = 0.99892) and pseudo-2nd-order kinetically ( k 2  = 0.00116 × 10 −4  g/mg min, R 2  = 0.99721).