Abstract
The coexistence of pollutants presents a great challenge to the implementation of photocatalysts. In this work, a novel MIL-101(Fe)/TiO2 composite prepared by in situ growth of MIL-101(Fe) on TiO2 was developed for the synergetic oxidation of MC-LR and Cr(VI) reduction. The heterojunction material shows elevated photocatalytic behavior under ultraviolet compared with the unary pollutant system. Furthermore, quenching experiments and electron spin resonance confirm that the enhanced photodegradation behavior is related to the synergistic effect between the photocatalytic reduction and oxidation process, in which MC-LR consumes the holes and Cr(VI) captures electrons, followed by efficient charge separation through the conventional double-transfer mechanism between MIL-101(Fe) and TiO2. This investigation provides a deeper understanding of the construction of MOFs/semiconductor heterojunctions for the pollutants removal in multi-component contaminants system.
Highlights
Heavy metal and organic pollutions pose a major threat to the environmental issues and human health [1,2,3]
This enhanced mechanism was explored through an energy diagram where the position of conduction and the valance bands for both MIL101(Fe) and TiO2 were determined and the preferential role of holes in the MIL-101(Fe) matrix and photo generated e− in the TiO2 matrix were experimentally verified by radical scavenger experiments, electron spin resonance (ESR) and electrochemical test, etc
The precursor of MIL-101(Fe) was decorated on TiO2 based on the conversion of Fe3+ to γ-FeOOH at a constant temperature of 95 ◦C [37]
Summary
Heavy metal and organic pollutions pose a major threat to the environmental issues and human health [1,2,3]. Heavy metal pollution exists in Taihu Lake, Jiangsu and Lake Dian, Yunnan China, where cyanobacterial blooms occur frequently [9,10] This makes their removal more challenging due to the competition of coexisting substances. The simultaneous reduction of Cr(VI) and oxidation of MC-LR led to increased activity in both processes in comparison to separate reactions This enhanced mechanism was explored through an energy diagram where the position of conduction and the valance bands for both MIL101(Fe) and TiO2 were determined and the preferential role of holes in the MIL-101(Fe) matrix and photo generated e− in the TiO2 matrix were experimentally verified by radical scavenger experiments, electron spin resonance (ESR) and electrochemical test, etc. This work provides a new strategy employing a semiconductor/MOF material as a catalyst for the synergetic removals of pollutants in hybrids system
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