Chemically stable and reusable nano zero-valent iron/graphite-like carbon nitride nanohybrid for efficient photocatalytic treatment of Cr(VI) and rhodamine B under visible light
Chemically stable and reusable nano zero-valent iron/graphite-like carbon nitride nanohybrid for efficient photocatalytic treatment of Cr(VI) and rhodamine B under visible light
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化学稳定且可重复使用的纳米零价铁/类石墨氮化碳纳米杂化物，用于可见光下高效光催化处理 Cr(VI) 和罗丹明 B
DOI：
10.1016/j.apsusc.2016.06.010
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发表时间：
2016-11
影响因子：
6.7
通讯作者：
Yu Yan
中科院分区：
文献类型：
--
作者：
Liang Zhiyu;Wen Qingjuan;Wang Xiu;Zhang Fuwei;Yu Yan
类石墨碳氮化物（g-C3 N4）在可见光光催化水处理方面具有很好的应用前景，但其光生电子-空穴对复合几率高，对重金属还原能力弱，限制了其应用。本文报道了nZVI-g-C3 N4纳米杂化材料的合成及其在可见光照射下对RhB和Cr（VI）的高效光降解。采用硼氢化物还原法可以将纳米零价铁颗粒很好地固定和分散在g-C3 N4纳米片表面。合成的nZVI-g-C3 N4具有比纯g-C3 N4更好的光催化活性，其中Cr（VI）和RhB的去除率分别超过92.9%和99.9%。纳米ZVI颗粒不仅有助于Cr（VI）的还原和固定，而且由于光激发空穴和电子的复合速率较低，加速了RhB的光催化降解效率。此外，nZVI-g-C3 N4在五个实验循环后保持了上级光降解效率。结果表明，nZVI-g-C3 N4光催化剂具有较好的化学稳定性，且部分nZVI可被g-C3 N4回收。我们相信，本文报道的nZVI-g-C3 N4复合材料可以为设计高效和可重复使用的材料提供指导，以去除沃茨中的有机化合物和重金属离子。
Graphite-like carbon nitride (g-C3N4) displays strong potential applications in visible-light photocatalytic for water treatment, but its applications are greatly restricted by high recombination probability of photo-generated electron-hole pairs, as well as a weak reduction ability toward the heavy metals. In this work, we reported the synthesis of nZVI-g-C3N4nano-hybrid with highly efficiency toward the photodegradation of RhB and Cr(VI) under the visible light irradiation. The nZVI nanoparticles can well be immobilized and dispersed on the surface of g-C3N4nanosheets by a facile borohydride-reduction method. As-synthesized nZVI-g-C3N4has an improved photocatalytic activity much better than that of the pure g-C3N4, wherein over 92.9% of Cr(VI) and 99.9% of RhB can be removed by using nZVI-g-C3N4. The nZVI particles not only contributes to the reduction and immobilization of Cr(VI), but also accelerates the photocatalytic degradation efficiency of RhB due to a lower recombination rate of photoexcited holes and electrons. Moreover, nZVI-g-C3N4preserves superior photodegradation efficiency after five experimental cycles. It can be attributed that nZVI-g-C3N4photocatalyst is chemically stable, and part of nZVI can be recovered by g-C3N4. We believe that, the composite of nZVI-g-C3N4reported here could provide guidance for the design of efficient and reusable materials to remove both the organic compounds and heavy metal ions from waste waters.
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影响因子：
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