Details

Autor(en) / Beteiligte

• Shahid, M
• Saleh, Hatem A. M
• Qasem, Khalil M. A
• Ahmad, Musheer

Titel

A novel sustainable metal organic framework as the ultimate aqueous phase sensor for natural hazards: detection of nitrobenzene and F at the ppb level and rapid and selective adsorption of methylene blue

Ist Teil von

• CrystEngComm, 2020-06, Vol.22 (22), p.3891-399

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Herein, a new cationic Cu( ii )-based porous and water stable metal-organic framework (MOF), [{Cu(bipy) 1.5 (H 2 pdm)}·2NO 3 ·H 2 O] n ( Cu-MOF-1 ), is synthesised via a slow evaporation process using pyridine-2,6-dimethanol (H 2 pdm) and 4,4′-bipyridine (bipy). The MOF is characterized using Fourier-transform infrared (FTIR) spectroscopy, powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA), magnetic analysis and single-crystal X-ray diffraction analysis. The structural unit of Cu-MOF-1 consists of two Cu( ii ) ions bridged by bipy and supported by H 2 pdm. This material exhibits excellent sensing ability for nitrobenzene (NB) and fluoride ions (F − ) in 100% aqueous medium with an ultra-low limit of detection of 0.093 and 1.203 ppb for NB and F − , respectively. The detection of nitro aromatic compounds (NACs) was found to be governed by photo-induced electron transfer (PET) and fluorescence resonance energy transfer (FRET) mechanisms, while vapour pressure played a major role in NB detection, with a high fluorescence quenching of 96.4%. Moreover, the MOF showed high water stability, significant recyclability and microporosity. The MOF was also employed for the adsorption and separation of methylene blue (MB) from a mixture of three dyes (MB, rhodamine-B and methyl orange). At equilibrium, the removal percentage of Cu-MOF-1 for MB was 98.23% and the mechanism of dye adsorption was also explored. Thus, the present MOF was determined to be a sustainable multifunctional material for the aqueous phase sensing of hazardous NB and fluoride ions, as well as an excellent dye adsorbent. A novel metal organic framework (MOF) exhibits good aqueous phase sensing properties towards nitrobenzene and fluoride anions and selective adsorption/separation ability for methylene blue.