Multi-functional metal–organic frameworks for detection and removal of water pollutions

Abstract

Water pollutions have caused serious threats to the aquatic environment and human health, it is of great significance to monitor and control their contents in water. Compared with the traditional...

Multifunctional Oxidized Succinoglycan/Poly(N-isopropylacrylamide-co-acrylamide) Hydrogels for Drug Delivery

“…Among them, pH- or temperature-sensitive hydrogels are the most extensively studied polymer systems [ 7 ]. Poly(N-Isopropylacrylamide) (PNIPAM), one of the thermally reactive polymers, has been the most studied because it exhibits a unique volume phase transition from the hydrolyzed expansion state to the collapsed state at a low critical solution temperature (LCST) of about 32 °C [ 6 , 8 ]. In contrast, acrylamide and acrylic acid are typical examples of pH-responsive synthetic polymers [ 9 , 10 ].…”

Two Stable Cd-MOFs as Dual-Functional Materials with Luminescent Sensing of Antibiotics and Proton Conduction

“… , To elucidate whether the luminescent emission may be influenced by the interactions or collision between CAP and frameworks, the luminescent lifetimes of 1 and 2 before and after sensing CAP in aqueous solutions were tested. Figure S11 and Table S6 reveal that the luminescent lifetimes of 1 and 2 almost do not change upon the addition of CAP, indicating that static quenching is dominant. , To further analyze the interactions between MOFs and CAP, the XPS spectra were performed (Figures S12 and S13). A comparison of 1 and 2 shows that the binding energy of N 1s changed from 404.74 to 404.58 eV for 1 and 404.76 to 404.57 eV for 2 after the detection of CAP.…”

“…Multifunctional materials exhibiting multiple properties in a single crystalline material have attracted extensive attention in material science and chemistry. − Metal–organic frameworks (MOFs) are considered to be a promising platform for designing multifunctional materials. − ,− Due to the diversities of compositions including metal cations or clusters and bridging ligands, the structures and properties of MOFs can be relatively easily modulated and controlled by the synthetic conditions and selection of different structural units. ,,− Recently, multifunctional MOF materials with proton conduction and luminescent sensing properties have received more attention due to their potential usage in clean energy as well as environmental monitoring fields. − …”

“…To obtain the targeted multifunctional MOFs, selecting the appropriate metal centers and organic ligands is very crucial . It is well known that MOFs composed of d 10 metal centers and functional ligands can display excellent luminescence and proton conduction performances, which provide a chance to construct dual-functional MOFs with luminescent sensing and proton conduction. ,, It has been demonstrated that the organic components of MOFs are crucial in determining the structures and properties of MOFs. ,,, Organic phosphonic acid (RPO 3 H 2 ) ligands have three oxygen atoms and can link multiple metal ions with diverse coordination modes, which have been well used for building phosphonate-based MOFs with different structures and properties. ,− Because of the strong coordination abilities of the phosphonic acid ligands, metal phosphonates generally exhibit better thermal and chemical stabilities than other MOFs. ,− , Therefore, metal phosphonates provide an opportunity for the construction of multifunctional MOFs with stable structures and multiple properties. In addition, the synthetic method of introducing second ligands has also been broadly used in the construction of multifunctional MOFs. ,,, Based on hard and soft acid–base theory, the transition-metal ions prefer to coordinate with the nitrogen atom.…”

Rational design of COF–MOF composites for ratiometric fluorescence detection of phosphate

“…[7][8][9] To date, several MOF-based fluorescent probes including transition metal organic frameworks and lanthanide organic frameworks have been prepared for the detection of phosphate. [10][11][12][13][14][15][16][17][18] The main principle of transition metal organic framework probes is based on the interaction of phosphate with Zn 2+ and Zr 4+ . Since transition metal ions cannot emit fluorescence, they usually need to be combined with fluorophores to construct a fluorescent probe which limits the development of fluorescent MOFs.…”