posted on 2021-12-27, 17:45authored byZhong-Hong Zhu, Yubo Liu, Chi Song, Yating Hu, Guangxue Feng, Ben Zhong Tang
Water
treatment is crucial to improve the water quality and reduce
diarrheal and chronological diseases caused by excessive discharge
of organic dyes and other waste. The development and expansion of
efficient catalysts for the degradation and sterilization of organic
dyes has attracted widespread attention. Herein, we report an example
of a porphyrin-based two-dimensional layered metal–organic
framework (MOF) (2DZnTcpp) and its efficient sono-/photocatalytic
degradation of organic dyes and bactericidal activity. The dislocated
layers effectively avoid close π–π stacking and
provide a porous space for oxygen/water/dye contact. The introduction
of Zn ions increases the spin orbital coupling through the heavy atom
effect and promotes the intersystem crossing process for singlet oxygen
generation. The effective ligand-to-metal charge transfer and the
excessive open Zn catalytic sites also facilitate water splitting
for hydroxyl radical generation. These features together promote the
reactive oxygen species (ROS) generation of 2DZnTcpp under light illumination
or ultrasound sonication. It is worth noting that the 2DZnTcpp with
a high specific surface area and porosity shows efficient sono-/photocatalytic
degradation of organic dye waste. Moreover, 2DZnTcpp could also largely
inactivate Escherichia coli under light irradiation
(the light power of 1 sun) or ultrasound sonication for 30 min with
efficiencies over 99.99999%. This work provides an approach for the
design and synthesis of MOF-based sono-/photocatalysts used in the
purification and treatment of textile wastewater and is committed
to the establishment of a more efficient, fast, and environmentally
friendly catalytic system.