Mesoporous Silica-Confined MOF-525 for Stable Adsorption of Tetracycline over a Wide pH Application Range

Abstract

SBA-15@MOF-525 composites were constructed by in situ self-assembly of a metal–organic framework (MOF-525) with mesoporous SBA-15 silica. MOF-525 crystals were confined inside the mesopores as well as grown on the outside surface of SBA-15, under the impact of the structure-directing role of SBA-15, and the composites exhibited both microporous and mesoporous characteristics. In general, the adsorption of tetracycline (TC) on MOF-525 was affected by pH. The adsorption capacity of MOF-525 decreased rapidly, especially in an alkaline environment, due to the collapse of the MOF-525 skeleton. By contrast, incorporating MOF-525 into SBA-15 improved the stability of MOF-525. The adsorption of TC on SBA-15@MOF-525 was almost unaffected by pH. High and stable adsorption capacity over a wide pH range was maintained under acidic, neutral, and alkaline environments. The composites were used effectively for TC adsorption. The maximum adsorption capacity of TC on SBA-15@MOF-525 was 690 mg/g, which is higher than that of most of the reported adsorbents. The great potential of SBA-15@MOF-525 in practical applications was demonstrated by investigating the adsorption of TC in lake water samples.

Polyimide/Ag2WO4 Z-Scheme Heterojunction for Efficient Photocatalytic Degradation of Tetracycline

“…As a broad-spectrum antibiotic, tetracycline (TC) has been widely used in the field of human and animal treatments . However, owing to the overuse and incomplete metabolism of TC, it is discharged into the environment through domestic and medical wastewater. , Unfortunately, traditional treatment processes cannot eradicate antibiotics , and TC that exists in water environments threatens the health of humans and the development of society .…”

Enhanced CH4/N2 Separation Efficiency of UiO-66-Br2 through Hybridization with Mesoporous Silica

“…The intricate nature of the preparation process, limited yield, and elevated cost associated with metal-organic frameworks (MOFs) serve as constraints on their widespread utilization. Therefore, after evaluating various commercial materials such as activated carbon, a carbon molecular sieve, and a zeolite molecular sieve, a rod-shaped SBA-15 with a significant surface area is chosen as the optimal carrier for the MOF structure [ 38 , 39 , 40 ].…”