Nanochitosan/carboxymethyl cellulose/TiO2 biocomposite for visible-light-induced photocatalytic degradation of crystal violet dye

Development of novel bionanomaterials for water and wastewater treatment has gained increased attraction and attention in recent times. The present study reports an effective biocomposite-based nano-photocatalyst comprised of nanochitosan (NCS), carboxymethyl cellulose (CMC), and titanium dioxide (T...

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Bibliographic Details
Published in:Environmental research 2022-03, Vol.204, p.112047-112047, Article 112047
Main Authors: Sugashini, S., Gomathi, T., Devi, R. Aruna, Sudha, P.N., Rambabu, K., Banat, Fawzi
Format: Article
Language:English
Subjects:
Carboxymethyl cellulose
Crystal violet
Dye degradation
Nanochitosan
Photocatalyst
TiO2
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Summary:Development of novel bionanomaterials for water and wastewater treatment has gained increased attraction and attention in recent times. The present study reports an effective biocomposite-based nano-photocatalyst comprised of nanochitosan (NCS), carboxymethyl cellulose (CMC), and titanium dioxide (TiO2) synthesized by sol-gel technique. The as-prepared NCS/CMC/TiO2 photocatalyst was systematically characterized by X-ray diffraction, Fourier Transform Infrared spectroscopy, Scanning Electron Microscopy with energy dispersive X-beam spectroscopy, Differential scanning calorimetry (DSC), and Thermogravimetric analysis (TGA). Photocatalytic degradation of the crystal violet (CV) dye using this nano photocatalyst was studied by varying the irradiation time, catalyst dosage, feed pH, and initial dye concentration. Further, the kinetic analysis of dye degradation was explored using the Langmuir−Hinshelwood model, and a plausible photocatalytic mechanism was proposed. The modification of TiO2 using NCS and CMC accelerated photocurrent transport by increasing the number of photogenerated electrons and holes. Overall, the study indicated the excellent photocatalytic performance of 95% CV dye degradation by NCS/CMC/TiO2 than the bare inorganic TiO2 photocatalyst under visible light irradiation. [Display omitted] •TiO2 nanoparticles were supported on NCS and CMC biopolymer blend layer.•NCS/CMC inclusion to TiO2 induced photocatalytic activity under visible light.•NCS/CMC/TiO2 exhibited a maximum CV dye degradation efficiency of 95%.•Nanocomposite showed more photogenerated electrons & holes due to NCS/CMC addition.•NCS/CMC/TiO2 photocatalyst was efficiently used upto 4 cycles of CV removal.
ISSN:0013-9351
1096-0953
DOI:10.1016/j.envres.2021.112047