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Cellulose reinforced-TiO2 photocatalyst coating on acrylic plastic for degradation of reactive dyes

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Abstract

In this study, cellulose reinforced-TiO2 (C-T) film was coated on acrylic plastic sheet and used for UV photocatalytic degradation of four reactive dyes viz., Reactive Black 5, Reactive Red 11, Reactive Orange 16, and Reactive Red 2 in a falling film reactor (FFR). Slurry comprising cellulose and TiO2 in suitable weight proportions (5, 10, 15, and 25 wt% cellulose) was prepared and a C-T film was obtained by brush coating on acrylic plastic sheet. The composition yielding adherent film and efficient for the dye degradation was identified. The effect of hydraulic flow rate and solution pH on the stability of the C-T films was also investigated. The photocatalytic coating containing 15 wt% cellulose was found to be adherent and efficient for dye degradation. The photodegradation of the reactive dyes, monitored in terms of decolorization (>80%), and reduction in total organic carbon (TOC) during 5 h followed pseudo first-order kinetics. The mineralization efficiency at 5 h treatment using 15 wt% C-T coating was in the range 75.4–83.3% for all the dyes. On the basis of optical microscopy images, the stability of the C-T films obtained from 15 wt% cellulose was attributed to the interlacing of the cellulose fibers that reinforced the TiO2 coating.

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Acknowledgments

The authors thank Dr. T. Chakrabarti, Director, NEERI, and Dr. Tapas Nandy, Scientist & Head, WWT Division, NEERI, for encouraging to publish the work. This work was carried out with the financial support under CSIR Network Programme (CORE-008) and SIP-16(3.2).

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  1. Wastewater Technology Division, National Environmental Engineering Research Institute (Council of Scientific and Industrial Research), Nehru Marg, Nagpur, 440020, India

    Nageswara Rao Neti & Priyanka Joshi

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  1. Nageswara Rao Neti
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  2. Priyanka Joshi
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Correspondence to Nageswara Rao Neti.

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Neti, N.R., Joshi, P. Cellulose reinforced-TiO2 photocatalyst coating on acrylic plastic for degradation of reactive dyes. J Coat Technol Res 7, 643–650 (2010). https://doi.org/10.1007/s11998-010-9244-7

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