Synthesis and characterization of Co/Ti layered double hydroxide and its application as a photocatalyst for degradation of aqueous Congo Red

RSC Advances
Priyadarshi Roy Chowdhury, Krishna G Bhattacharyya

Abstract

2 : 1 Co/Ti layered double hydroxide (LDH) was synthesized hydrothermally using commercially available Co(NO3)2·6H2O and TiCl4, on a urea template. The high surface area material (~180 m2 g-1) had a narrow band gap (2.67 eV) and shallow and deep trap defect sites. The layered nanomaterial exhibited remarkable semiconductor properties and demonstrated excellent visible light decolourisation efficiency for the anionic dye Congo Red in aqueous medium. The photocatalytic efficiency of the LDH was better than common commercial materials in use such as ZnO, ZnS, NiO, CoO, TiO2 and Degussa P25. The presence of different surface states of defect sites in the LDH was confirmed by PL, EIS and XPS measurements. XRD, DRS, FT-IR, AFM, TEM, SEM/EDX and TG/DTG analyses yielded information about the structural, morphological properties and thermal stability of the LDH. BET N2 adsorption-desorption measurements at 77 K gave surface area and porosity data for the LDH. The surface charge characteristics of the LDH were evaluated with ξ-potential measurements over a wide pH-range in aqueous medium. The photocatalytic behaviour towards decolourisation of the dye was evaluated depending on the reaction variables of pH, LDH amount, initial dye concen...Continue Reading

References

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Sep 4, 2009·Journal of the American Chemical Society·Cláudia Gomes SilvaHermenegildo García
Sep 17, 2009·Physical Chemistry Chemical Physics : PCCP·Jonas BaltrusaitisVicki H Grassian
Sep 10, 2014·Chemical Society Reviews·Min-Quan YangYi-Jun Xu
Mar 13, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Priyadarshi Roy Chowdhury, Krishna G Bhattacharyya
Apr 10, 2015·Chemical Society Reviews·Siqi LiuYi-Jun Xu

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Citations

Apr 7, 2020·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Andrew Shore
Jul 7, 2017·Environmental Science and Pollution Research International·Priya AroraJigyasa Badhan

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