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Issue 11, 2017
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Efficient visible light-driven in situ photocatalytic destruction of harmful alga by worm-like N,P co-doped TiO2/expanded graphite carbon layer (NPT-EGC) floating composites

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Abstract

The bloom of harmful algae in water has adversely affected water quality, local economies, and human health. Efficient visible light driven floating photocatalysts, namely N,P co-doped TiO2/expanded graphite carbon layer (NPT-EGC) composites, were successfully synthesized using a sol-carbonization method, and then applied as algaecides. The synthesized photocatalysts were characterized by means of XRD, FESEM/EDS, TEM, FTIR spectroscopy, XPS, UV-vis DRS, and PL spectroscopy. The results show that the NPT-EGC composites have a worm-like structure with the N,P co-doped TiO2 particles immobilized on the surface. Among the NPT-EGC photocatalysts with different calcination temperatures, NPT-EGC450 exhibits the highest photocatalytic activity. The removal rate of the algal cells is 98.15% for NPT-EGC450 following 9 h of visible light irradiation. The photocatalytic destruction process can be divided into a rapid adsorption phase and a repeat of the cell reduction phase-lag phase. During the photocatalytic process, the algal cells were damaged as a result of photocatalysis induced oxidation and inhibition. In addition, we simulated the release of MC-LR in the photocatalytic destruction process for the algal cells. The results show that the photocatalyst can remove both the algal cells and MC-LR simultaneously with high efficiency. After three consecutive cycles, the removal rate of the algal cells is still more than 90% for NPT-EGC450, which demonstrates that the NPT-EGC photocatalyst has good reusability and stability.

Graphical abstract: Efficient visible light-driven in situ photocatalytic destruction of harmful alga by worm-like N,P co-doped TiO2/expanded graphite carbon layer (NPT-EGC) floating composites

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Publication details

The article was received on 21 Jan 2017, accepted on 01 May 2017 and first published on 01 May 2017


Article type: Paper
DOI: 10.1039/C7CY00133A
Citation: Catal. Sci. Technol., 2017,7, 2335-2346
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    Efficient visible light-driven in situ photocatalytic destruction of harmful alga by worm-like N,P co-doped TiO2/expanded graphite carbon layer (NPT-EGC) floating composites

    X. Wang, X. Wang, J. Zhao, J. Song, L. Zhou, R. Ma, J. Wang, X. Tong and Y. Chen, Catal. Sci. Technol., 2017, 7, 2335
    DOI: 10.1039/C7CY00133A

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