Details

Autor(en) / Beteiligte

• Song, Yongcun
• Wang, Nan
• Yang, Li-ye
• Wang, Yang−guang
• Yu, Di
• Ouyang, Xiao-kun

Titel

Facile Fabrication of ZIF-8/Calcium Alginate Microparticles for Highly Efficient Adsorption of Pb(II) from Aqueous Solutions

Ist Teil von

• Industrial & engineering chemistry research, 2019-04, Vol.58 (16), p.6394-6401

Ort / Verlag

American Chemical Society

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Metal–organic frameworks (MOFs) have received special attention from scientists owing to their excellent adsorption performance. However, the difficulty in separating MOFs from adsorbed metals following use has limited their application. A zeolitic imidazole-based MOF with broad applicability for sorption of Pb­(II) is examined. In this work, a novel adsorbent employing ZIF-8/calcium alginate microparticles was prepared using sodium alginate and ZIF-8. This adsorbent was characterized using scanning electron microscopy, Fourier-transform infrared spectroscopy, X-ray diffraction analysis, and X-ray photoelectron spectroscopy. The performance of the ZIF-8@CA microparticles in adsorbing Pb­(II) from a Pb­(II) solution was investigated, and the impacts of the initial Pb­(II) concentration, reaction time, pH, and reaction temperature on the reaction process were investigated. The results showed that ZIF-8@CA microparticles exhibited a maximum adsorption capacity of 1321.21 mg/g at pH 5 after 120 min, and the adsorption process was found to fit the Langmuir isotherm model (R 2 = 0.9856) and the pseudo-second-order kinetic model (R 2 = 0.9999). These results showed that the adsorption of Pb­(II) was an endothermic process. The regeneration experiment with ZIF-8@CA revealed that the removal efficiency of Pb­(II) was greater than 80% even after five cycles.