首页|Novel 0D-1D-2D nanostructured MCN/NCDs recyclable composite for boosted peroxymonosulfate activation under visible light toward tetracycline degradation
Novel 0D-1D-2D nanostructured MCN/NCDs recyclable composite for boosted peroxymonosulfate activation under visible light toward tetracycline degradation
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NSTL
In this study,a novel nitrogen modified carbon quantum dots(NCDs)decorated graphite carbon nitride/molybdenum(Mo)heterojunction photocatalyst(MCN/NCDs)was obtained by in-situ calcination and physical deposition,and applied as peroxymonosulfate(PMS)activators for tetracycline(TC)removal under visible light.It was found that the MCN/NCDs as PMS activation catalyst exhibited outstanding removal efficiency under visible light assistance and nearly 98.4% of TC was degraded within 60 min.The analysis data of photochemistry demonstrated that the introduction of NCDs could significantly improve the visible-light utilization,narrow the band gap and increase the separation of photogenerated electron-hole pairs.The results of radical capture experiment and electron spin resonance test(ESR)suggested that the order of active species contributing to TC degradation in vis/PMS/MCN/NCDs system was O_2~(·-)>h~+>·OH>~1O_2>SO_4~(·-)Moreover,the MCN/NCDs composite exhibited excellent stability with over 98% activity retention for 5 cycles and superior catalytic efficiency in four real water matrix.Finally,the underlying degradation mechanism and toxicity assessment were proposed in detail.This work provided a new perspective on the design of excellent activity g-CsN4 composite catalysts and elucidated a promising potential strategy for efficient contaminated water treatment via PMS activation process.
NSTL
