Enhanced Photocatalytic Degradation of Methylene Blue Using /MWCNT Composite Synthesized by Hydrothermal Method

Indian Journal of Materials Science Pub Date : 2013-09-09 DOI:10.1155/2013/356025

S. Singhal, Rimi Sharma, Charanjit Singh, S. Bansal

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引用次数: 20

Abstract

Multiwalled carbon nanotubes (MWCNTs) were synthesized using arc discharge method at a magnetic field of 430 G and purified using HNO3/H2O2. Transmission electron micrographs revealed that MWCNTs had inner and outer diameter of ~2 nm and ~4 nm, respectively. Raman spectroscopy confirmed formation of MWCNTs showing G-band at 1577 cm−1. ZnFe2O4 and ZnFe2O4/MWCNT were produced using one step hydrothermal method. Powder X-ray diffraction (XRD) confirmed the formation of cubic spinel ZnFe2O4 as well as incorporation of MWCNT into ZnFe2O4. Visible light photocatalytic degradation of methylene blue (MB) was studied using pure ZnFe2O4 and ZnFe2O4/MWCNT. The results showed that ZnFe2O4/MWCNT composite had higher photocatalytic activity as compared to pure ZnFe2O4. After irradiation for 5 hours in the visible light, MB was almost 84% degraded in the presence of ZnFe2O4 photocatalyst, while 99% degradation was observed in case of ZnFe2O4/MWCNT composite. This enhancement in the photocatalytic activity of composite may be attributed to the inhibition of recombination of photogenerated charge carriers.

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水热法合成/MWCNT复合材料增强光催化降解亚甲基蓝

采用电弧放电法在430 G磁场下合成了多壁碳纳米管(MWCNTs)，并用HNO3/H2O2提纯。透射电子显微镜显示，MWCNTs的内径为~2 nm，外径为~4 nm。拉曼光谱证实形成的MWCNTs在1577 cm−1处显示g波段。采用一步水热法制备了ZnFe2O4和ZnFe2O4/MWCNT。粉末x射线衍射(XRD)证实了立方尖晶石ZnFe2O4的形成以及MWCNT在ZnFe2O4中的掺入。采用纯ZnFe2O4和ZnFe2O4/MWCNT对亚甲基蓝(MB)进行了可见光催化降解研究。结果表明，与纯ZnFe2O4相比，ZnFe2O4/MWCNT复合材料具有更高的光催化活性。ZnFe2O4光催化剂在可见光下照射5小时后，MB的降解率接近84%，而ZnFe2O4/MWCNT复合材料的降解率为99%。复合材料光催化活性的增强可能是由于抑制了光生载流子的重组。

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Indian Journal of Materials Science

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