Due to a synergistic effect of piezo-catalysis and photocatalysis , piezo-photocatalysis is gaining popularity as an effective approach to remove organic pollutants. In this work, single-component piezo-photocatalytic nanoparticles of UiO-66-NH 2 (Hf) metal-organic frameworks were prepared by a hydrothermal process with an average diameter of ∼52.6 nm. An ultrafast piezo-photocatalysis degradation of RhB solution was achieved by using the UiO-66-NH 2 (Hf) nanoparticles . Under UV light and ultrasound irradiation, the percentage of dye degradation for an initial RhB concentration of 5 mg/L reached 91 % in 60 s. The removal mechanism of RhB was investigated via capture experiments of active species, which revealed that the hydroxyl radicals and hole play a key role in the degradation of RhB. This work provides a reference for the piezo-photocatalytic capability and the underlying mechanism of single-component metal-organic framework based nanomaterials , promoting their further development in technological applications involving highly efficient catalysts.
Guihua Xu,Qiaoning He,Kexin Huang,Ying Wang,Chun Pu,Ganggang Chang,Xiaoyu Yang
Benefiting from their unique properties including faster mass transfer, more exposed active sites and large molecule recognition, hierarchically porous metal–organic frameworks (HP-MOFs), in the form of ultrasmall nanoparticles (NPs) and having self-assembled interparticle mesopores, have garnered greater attention in recent years that given to typical MOFs. However, controllable synthesis of HP-MOFs on the nanoscale remains a significant challenge. Herein, for the first time, a facile top-down acid etching strategy was developed to fabricate a series of nanosized (∼15 nm) mesoporous MOF, HP-UiO-66-NH 2 (Hf). The sizes of mesopores in this material can be effectively tuned by simply controlling the concentration of propionic acid (PA) utilized in the preparation solution. Interestingly, the generated mesoporous HP-UiO-66-NH 2 (Hf) has excellent stability and can be readily constructed by using PA etching solution that has been recycled at least four times. Remarkably, HP-UiO-66-NH 2 (Hf) displays a high size-selectivity for adsorption of enzymes. Associated with its highly matched mesopore size, the nanocomposite generated by complexation with glucose oxidase (GOD), [email protected] 2 (Hf) has a higher catalytic activity and a significantly enhanced stability (recycled at least 7 times) in promoting oxidation of glucose compared to its MOF counterpart, [email protected] 2 (Hf) and native GOD .
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