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Fabrication of Fe 3 O 4 /ZIF‐67 composite for removal of direct blue 80 from water
Author(s) -
Li Mingyan,
Gao Dasheng,
Cui Shuang,
Shi Yan,
Liu Ningning
Publication year - 2020
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.1002/wer.1269
Subject(s) - adsorption , x ray photoelectron spectroscopy , langmuir adsorption model , composite number , endothermic process , fourier transform infrared spectroscopy , materials science , scanning electron microscope , desorption , nuclear chemistry , chemical engineering , analytical chemistry (journal) , chemistry , composite material , chromatography , engineering
Fe 3 O 4 /ZIF‐67 composite was successfully fabricated by a facile method and used as adsorbent to remove direct blue 80 (DB80, azo dye) from water. Characterizations of Fe 3 O 4 /ZIF‐67 composite were performed by scanning electron microscopy (SEM), powder X‐ray diffraction (PXRD), X‐ray photoelectron spectroscopy (XPS), N 2 adsorption/desorption isotherms, Fourier transform infrared spectroscopy (FTIR), and magnetic property analysis. As an adsorbent, the factors (such as adsorbent dose, pH, initial concentration, contact time, and temperature) affecting the adsorption performance of adsorbent were investigated. The optimal adsorption condition is 5 mg of Fe 3 O 4 /ZIF‐67 composite in 8 ml of DB80 solution (70 mg/L) for 60 min at 318 K, and the pH value has little effect on the adsorption performance. The adsorption isotherm, kinetics, and thermodynamics of DB80 adsorbed on the Fe 3 O 4 /ZIF‐67 composite were also studied. The experimental results revealed that the experimental data followed the Langmuir model and the adsorption behavior could be well explained by pseudo‐second‐order kinetic model. Thermodynamic analysis indicated that the adsorption was a spontaneous and endothermic process. Furthermore, the mechanism of DB80 adsorbed on the Fe 3 O 4 /ZIF‐67 composite was proposed. The occurrence of adsorption might be caused by the π‐π stacking interaction between Fe 3 O 4 /ZIF‐67 composite and DB80. Practitioner points Fe 3 O 4 /ZIF‐67 composite was successfully fabricated via a facile method. Fe 3 O 4 /ZIF‐67 composite was used to the adsorptive removal of direct blue 80 (azo dye). The kinetic characteristics and thermodynamic parameters were analyzed. The adsorption behavior might be ascribed to the π‐π stacking interaction between Fe 3 O 4 /ZIF‐67 composite and DB80.