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TiO2/石墨烯-Fe3O4磁性三元復(fù)合光催化劑的制備及光催化性能
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中南大學(xué),中南大學(xué)

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國家自然科學(xué)基金項(xiàng)目（面上項(xiàng)目，重點(diǎn)項(xiàng)目，重大項(xiàng)目）


Synthesis and Photocatalytic Property of TiO2/ Graphene-Fe3O4 Magnetic Ternary Composite Photocatalyst
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Central South University,Central South University

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Fundamental Research Funds for the Central Universities (JN126001)

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    摘要:

    本文以改進(jìn)的Hummers法制備的氧化石墨烯為原料，采用共沉淀法獲得磁性的石墨烯-Fe3O4載體，進(jìn)而采用水熱法制備出TiO2/石墨烯-Fe3O4磁性三元復(fù)合光催化劑。借助X-射線衍射（XRD）、掃描電子顯微鏡（SEM）及固體紫外-可見漫反射光譜（UV-vis DRS）對產(chǎn)品進(jìn)行表征，并通過在紫外光和可見光下對亞甲基藍(lán)的降解來評價(jià)復(fù)合光催化劑的催化性能及穩(wěn)定性能。結(jié)果表明，TiO2/石墨烯-Fe3O4磁性三元復(fù)合光催化劑對亞甲基藍(lán)的光催化降解符合擬一級動(dòng)力學(xué)模型。該復(fù)合催化劑在紫外光和可見光下均具有較好的光催化性能，且催化活性均高于純TiO2。石墨烯由于擔(dān)當(dāng)了載體和電子受體，增強(qiáng)了TiO2在可見光區(qū)域的吸收，能有效提高對目標(biāo)污染物的光催化降解活性，同時(shí)通過添加磁性Fe3O4進(jìn)一步提高了其回收再利用性。

    Abstract:

    In this paper, graphene oxide was prepared as raw material by the improved Hummers method. Then graphene-Fe3O4 magnetic carrier was obtained by co-precipitation method, finally TiO2/graphene-Fe3O4 magnetic ternary complex photocatalyst was synthesized by hydrothermal method. The properties of products were characterized by XRD, SEM, and UV-Vis DRS. Photocatalytic activity and stability of the resulting catalyst was evaluated by the degradation of methylene blue solution under visible and UV light. It was found that the degradation reaction accorded with first-order kinetic model. The composite catalyst had better photocatalytic activity than pure TiO2 in the UV and visible light. As a support and electron acceptor, graphene extended and enhanced the band edge absorption of TiO2 into the visible light region, so it could effectively enhance the photocatalytic activity of TiO2. At the same time magnetic Fe3O4 was added to improve its recyclability.

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王瑞萌,劉輝. TiO2/石墨烯-Fe3O4磁性三元復(fù)合光催化劑的制備及光催化性能[J].稀有金屬材料與工程,2016,45(9):2444~2448.[wangruimeng, liuhui. Synthesis and Photocatalytic Property of TiO2/ Graphene-Fe3O4 Magnetic Ternary Composite Photocatalyst[J]. Rare Metal Materials and Engineering,2016,45(9):2444~2448.]
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  • 收稿日期:2014-07-27
  • 最后修改日期:2014-08-30
  • 錄用日期:2014-09-28
  • 在線發(fā)布日期: 2016-10-09
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