BiOBr nanoparticle-modified Ti3C2Tx MXenes for photocatalytic degradation of organic arsenic in wastewater
Yaxin Guo, Ya-Nan Wang, Jinsong Peng, Haiyan Song, Chunxia Chen
TL;DR
A new photocatalyst made of BiOBr nanoparticles and Ti3C2Tx MXenes effectively degrades organic arsenic in wastewater.
Contribution
A novel BiOBr/Ti3C2Tx photocatalyst was developed for efficient degradation of roxarsone in wastewater.
Findings
BiOBr/Ti3C2 achieved a roxarsone removal efficiency of 1.27 mg gcat.−1 h−1 within 0.5 h.
The catalyst showed a 1.5 times higher removal rate than pure Ti3C2Tx after 3 h.
The system exhibited a 29.5% apparent quantum yield and good reusability over 4 cycles.
Abstract
Arsenic (As) contamination in water remains a serious concern due to its high toxicity and harmful effects on human health and the environment. Herein, we successfully synthesized a novel photocatalyst (BiOBr/Ti3C2) by in situ inserting BiOBr nanoparticles into Ti3C2Tx MXenes for the photocatalytic degradation of organic arsenic roxarsone (3-nitro-4-hydroxyphenylarsonic acid) in wastewater. BiOBr/Ti3C2 exhibited a unique morphology characterized by uniform BiOBr nanoparticles within more dispersed Ti3C2Tx layers. Heterojunctions were formed between Ti3C2Tx and BiOBr, which were conducive to photogenerated charge separation and electron transfer in Ti3C2Tx layers. An optimal BiOBr/Ti3C2 photocatalyst achieved a removal efficiency of 1.27 mg gcat.−1 h−1 for 2 mg L−1 of roxarsone wastewater within 0.5 h and a higher removal rate (about 1.5 times at 3 h) than pure Ti3C2Tx. In addition,…
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Taxonomy
TopicsMXene and MAX Phase Materials · Advanced Photocatalysis Techniques · Nanocluster Synthesis and Applications