Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 10, Issue 1, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2021.106667
Keywords
Zn-MOF; Luminescence; Water stability; Selective adsorption; Sensitive detection
Categories
Funding
- Department of Science and Technology (DST) -Science and Engineering Research Board (SERB) , India [ECR/2017/000670]
- Indian Institute of Technology-Mandi (IIT Mandi, India) -SEED Grant [IITM/SG/NRT-58]
- Ministry of Education (MoE) , India
- FCT [IST-ID/107/2018]
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This paper reports the design and development of a water-stable luminescent Zn-based metal-organic framework with hydrophobic-hydrophilic surface property, which makes it an interesting platform for environmental applications.
Given the importance of surface-functionalized materials with improved adsorption and detection properties for targeted applications, we report herein the design and development of a water-stable luminescent Zn-based metal-organic framework (Zn-MOF) with the hydrophobic-hydrophilic surface property. The developed luminescent Zn(II)-MOF {[Zn(PA(2-))(dmbpy)](DMF)}n was synthesized via a solvothermal method using pamoic acid (PA) and 5,5'-dimethyl-2,2'-bipyridine (dmbpy) with free functional groups (hydroxyl and methyl groups). Careful single-crystal structure analysis revealed a 3-dimensional hydrogen-bonded network with a one-dimensional channel and functionalized surface. The surface functionalization was achieved through rational choice of ligands bearing methyl and hydroxyl groups as suitable hydrophobic and hydrophilic functionalities respectively, leading to a stable MOF in the aqueous medium. The MOF was used as an adsorbent for selective adsorption of monovalent permanganate anion (MnO4-) over other polyvalent oxo-anions as well as an optical platform for the detection of oxo-anions (permanganate (MnO4-), dichromate (Cr2O(7)(2-)) and chromate (CrO4(2-))) and pesticide (2,6-dichloro-4-nitroaniline (2,6-DCNA)) in the aqueous medium. Overall, a combination of luminescent nature and hydrophilic-hydrophobic surface property makes the developed Zn-MOF an interesting platform for environmental application.
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