Adsorptive Removal of Pharmaceuticals and Personal Care Products from Water with Functionalized Metal-organic Frameworks: Remarkable Adsorbents with Hydrogen-bonding Abilities.

Pill Won Seo,Nazmul Abedin Khan,Sung Hwa Jhung,Imteaz Ahmed,Biswa Nath Bhadra

doi:10.1038/srep34462

Pill Won Seo, Nazmul Abedin Khan + Show 3 more

Open Access

https://doi.org/10.1038/srep34462

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Journal: Scientific reports	Publication Date: Oct 3, 2016
Citations: 199	License type: CC BY 4.0

Affiliation: Kyungpook National University

Abstract

Adsorption of typical pharmaceuticals and personal care products (PPCPs) (such as naproxen, ibuprofen and oxybenzone) from aqueous solutions was studied by using the highly porous metal-organic framework (MOF) MIL-101 with and without functionalization. Adsorption results showed that MIL-101s with H-donor functional groups such as –OH and –NH2 were very effective for naproxen adsorption, despite a decrease in porosity, probably because of H-bonding between O atoms on naproxen and H atoms on the adsorbent. For this reason, MIL-101 with two functional groups capable of H-bonding (MIL-101-(OH)2) exhibited remarkable adsorption capacity based on adsorbent surface area. The favorable contributions of –OH and –(OH)2 on MIL-101 in the increased adsorption of ibuprofen and oxybenzone (especially based on porosity) confirmed again the importance of H-bonding mechanism. The adsorbent with the highest adsorption capacity, MIL-101-OH, was very competitive when compared with carbonaceous materials, mesoporous materials, and pristine MIL-101. Moreover, the MIL-101-OH could be recycled several times by simply washing with ethanol, suggesting potential application in the adsorptive removal of PPCPs from water.

Highlights

Adsorption of typical pharmaceuticals and personal care products (PPCPs) from aqueous solutions was studied by using the highly porous metalorganic framework (MOF) MIL-101 with and without functionalization
PPCPs may often remain in the environment even after they have been consumed completely[1,2,3,4,5,6] because PPCPs usually have long shelf lives to meet customers’ demands, and some PPCPs are inadvertently dumped into the environment
The X-ray powder diffraction (XRD) patterns of the MIL-101s shown in Fig. 2a are agreeable with simulated one[48,51], confirming the MIL-101s were successfully prepared and that the crystal structure of pristine MIL-101 does not change with functionalization

Summary

Introduction

Adsorption of typical pharmaceuticals and personal care products (PPCPs) (such as naproxen, ibuprofen and oxybenzone) from aqueous solutions was studied by using the highly porous metalorganic framework (MOF) MIL-101 with and without functionalization. Carbonaceous materials (including activated carbon, carbon nanotubes, and bone char)[3,15] and mesoporous materials (transition metal-grafted)[11,12] have been widely studied as potential adsorbents for the removal of PPCPs. There has been remarkable progress in research on nanoporous materials such as metal-organic frameworks (MOFs)[16,17,18,19,20,21,22,23,24] and mesoporous materials[25,26,27] in terms of both synthesis and applications. Water purification is another important field of application of MOFs41–44; functionalization of MOFs is expected to be important in water purification because MOFs are usually hydrophilic and ineffective for water purification without incorporating functionalities with special interactions[45]

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