Synthesis, characterisation and application of TiO2-zeolite nanocomposites for the advanced treatment of industrial dye wastewater

Meng Nan Chong, Zhen Yang Tneu, Phaik Eong Poh, Bo Jin, Rupak Kumar Aryal

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    Abstract

    Photocatalysis usually involves the utilisation of nano-sized semiconductor photocatalysts owing to their higher specific surface area and surface reaction rate. However, the key challenges in the utilisation of nano-sized photocatalysts for advanced treatment of industrial dye wastewater are to enhance the post-separation and recovery of spent photocatalysts to prevent them from diffusing into the environment. Thus, the main aim of this study was to synthesize a functional-form of titanium dioxide (TiO2)-zeolite nanocomposite through the modified two-step sol-gel method for enhanced application and separation after advanced industrial dye wastewater treatment. The synthesized TiO2-zeolite nanocomposite was characterised using field-emission scanning electron microscopy (FE-SEM), energy dispersive X-ray (EDX) analysis, Fourier-transformed infrared spectroscopy (FTIR), particle size distribution analysis and Brunauer-Emmett-Teller (BET) specific surface area and porosity analysis. Subsequently, the photoactivity of synthesized TiO2-zeolite nanocomposite was measured and compared against the commercial TiO2 particles. It was found that the TiO2-zeolite nanocomposite shows a high apparent pseudo-first order reaction rate constant of 0.0419min-1 at lower dye concentration. This showed that the synthesized TiO2-zeolite nanocomposite follows a more adsorption-oriented photocatalytic degradation of water pollutants, which is useful for removing trace and untreated dye compounds in the advanced industrial dye wastewater treatment stage.
    Original languageEnglish
    Pages (from-to)288 - 296
    Number of pages9
    JournalJournal of the Taiwan Institute of Chemical Engineers
    Volume50
    Issue numberMay 2015
    DOIs
    Publication statusPublished - 2015

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