One-pot synthesis of Al-containing mesoporous silicas in a mildly acidic condition for efficient tetracycline adsorption
Microporous and Mesoporous Materials(2022)
摘要
Tetracycline (TC), one of the widely used antibiotics in wastewater, has caused serious interferences in human health and ecological balance. Herein, a series of Al-containing mesoporous silicas (Al–SiO2) were direct synthesized from mildly acidic solutions in which the acidity was self-generated by the AlCl3 precursor. Structure characterizations disclose that Al–SiO2 has both of long-range well-ordered and short-range ordered mesopores, large surface area (723–876 cm2 g−1), high pore volume (0.83–1.06 cm3 g−1), and a small number of Al species (0.44–1.10 wt %) in it. In batch tests, all Al–SiO2 materials present fast uptake and high removal efficiency (RE) towards high concentrated TC (C0 = 80 mg L−1, RE = 60–83%). Among them, the sample synthesized with rAl/Si = 1.0 displays the largest TC adsorption capacity (74.6 mg g−1), which is much higher than conventional SBA-15 (13.2 mg g−1), porous Al2O3 (27.8 mg g−1) and industrial SiO2 (3.4 mg g−1). Meanwhile, the Al–SiO2 possesses favorable removal efficiency in neutral pH range (pH = 5.0–7.0, RE > 77%), quite good selectivity to tetracycline and quinolone antibiotics, excellent cycling stability in the removal of TC (RE = 74% after six cycles). This study provides a simple and facile method for the synthesis of heteroatom-containing mesoporous adsorbents for the removal of antibiotics in wastewater.
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关键词
Mesoporous material,Al–SiO2,One-pot synthesis,Tetracycline,Adsorption
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