Gold Bulletin

, Volume 50, Issue 1, pp 33–41 | Cite as

Effect of Au content on the enhanced photocatalytic efficiency of mesoporous Au/TiO2 nanocomposites in UV and sunlight

Original Paper


Detoxification of harmful dyes through nonconventional catalytic processes is getting thrust in light of environmental remediation. Current work reveals synthesis of gold–titania (Au/TiO2) mesoporous nanostructure and its enhanced photocatalytic performance for degradation of alizarin dye. Optically, Au/TiO2 shows a characteristic surface plasmonic absorption band at 520 nm, whereas X-ray diffraction (XRD) pattern reveals the anatase phase of TiO2 with fcc unit cell structure and tetragonal geometry. X-ray photon spectroscopy depicts (Au 4f7/2 at 84.0 and Au 4f5/2 at 87.7 eV) the elemental state of gold (Au0). Specific surface area was witnessed to decrease with increase of Au content (169, 141, 130, and 119 m2/g for 1, 2, 3, and 4 wt%, respectively). The mesoporous Au/TiO2 nanocomposite showed higher catalytic performance in comparison to commercial nano-TiO2 (P25), which is credited to better charge delocalization at metal semiconductor interface. The reusability studies of the photocatalyst exhibited more than 98% degradation of the dye even after 10 consecutive cycles.


Nanocomposites HDP Alizarin dye Photocatalysis 



Authors are thankful to DST (Grant No. SB/FT/CS-178/2013), New Delhi, for financial assistance.

Compliance with ethical standards

Conflict of interests

The authors declare that they have no conflict of interest.


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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  1. 1.School of Chemistry and BiochemistryThapar UniversityPatialaIndia
  2. 2.Department of ChemistryIndian Institute of Technology DelhiNew DelhiIndia

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