Pengyan Wu

Cadmium-Based Metal–Organic Framework as a Highly Selective and Sensitive Ratiometric Luminescent Sensor for Mercury(II)

A novel cadmium-based metal-organic framework (MOF) material with dual-emission signals has been constructed that can act as the first example of MOF-implicated ratiometric sensor for mercury(II) in pure water with a fast response, high selectivity, and sensitivity. The sensing mechanism is also discussed.

A metal–organic framework with a 9-phenylcarbazole moiety as a fluorescent tag for picric acid explosive detection: collaboration of electron transfer, hydrogen bonding and size matching

We report here an electron-rich luminescent metal–organic framework (MOF), Zn–PDA, displaying high selectivity in the detection of PA (picric acid) explosive as a fluorescent sensor, which can serve as the first case of MOFs for detecting PA through synergistic effects including electron transfer, hydrogen-bonding and size matching.

A cadmium(II)-based metal–organic framework for selective trace detection of nitroaniline isomers and photocatalytic degradation of methylene blue in neutral aqueous solution

A robust luminescent metal–organic framework (MOF), Cd–PDA, was solvothermally synthesized and structurally characterized. Cd–PDA has a 3D stable framework decorated with one-dimensional rectangular channels (7.13 × 10.59 A2). It showed superior sensitivity towards p-nitroaniline compared to other nitroaniline isomers. The detection limit for p-nitroaniline was found to be extremely low, 3.5 ppb in solution, which represents one of the most efficient porous material-based sensors for p-NA. And the sensing mechanism was discussed through FT-IR spectra and molecular force field-based calculations. In addition, the photocatalytic activities of Cd–PDA were also determined by 500 W Xe lamp induced photodegradation of methylene blue (MB) experiments. Cd–PDA has the advantages of excellent catalytic activity, stability, and availability. Along with ease of recyclability, it will be useful in practical applications.

A europium(III)-based metal–organic framework as a naked-eye and fast response luminescence sensor for acetone and ferric iron

A europium(III)-based metal–organic framework {[Eu(bpda)1.5]·H2O}n Eu–BPDA (BPDA = biphenyl-2,2′-dicarboxylic acid) has been solvothermally synthesized and structurally characterized. The MOF has a three-dimensional architecture and shows bright red-emission even in water solution. It is found that the MOF exhibits a significant fluorescence quenching effect toward acetone. In particular, it possesses a fast response of 5 s, high sensitivity with an EC50 of 0.028 vol%, which is below the occupational exposure limit of acetone stipulated by the American Conference of Governmental Industrial Hygienists (ACGIH), naked-eye visualization and easy recycling. Moreover, it could also be used as an excellent naked-eye fluorescence sensor for Fe3+ ions with a Stern–Volmer constant KSV = 1.25 × 104 L mol−1 and unusually high selectivity in pure water. The fluorescence quenching mechanism for acetone and Fe3+ ions was also investigated, giving a rare example that worked as an efficient dual sensor for acetone and Fe3+ detection.

Highly efficient photocatalytic hydrogen production from pure water via a photoactive metal–organic framework and its PDMS@MOF

A novel photoactive porous MOF, Zn–PDA2, with a high density distribution of photoadsorbing units, has been synthesized. It serves as an effective photosensitizer for H2 evolution, boosting the photocatalytic efficiency up to approximately 16 times the value afforded by the homogeneous control, and the potential factors resulting in such a high efficiency are also discussed in detail. Importantly, the stability was significantly enhanced using a facile vapor deposition technique; the modified system gives up to 12 880 turnovers versus Zn–PDA2 and could be well recycled. The present study provides some guidelines for the design and synthesis of high-efficiency and stable photoactive materials.

Highly Efficient Visible-Light-Driven H2 Production via an Eosin Y-Based Metal–Organic Framework

A simple and effective strategy was developed to immobilize ecofriendly dye inside a porous metal-organic framework (MOF) built from Eosin Y with [Cd2(COO)2(μ2-H2O)] secondary building units for the first time. The MOF exhibited efficient photocatalytic activity for H2 evolution under visible-light irradiation with a turnover number of 13920 and an initial turnover frequency of 7433 h-1, which was approximately 31 times the photocatalytic efficiency of Eosin Y.