Adsorption of the diazo dye Direct Red 23 onto a zinc oxide surface: a spectroscopic study

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Adriana Campano LucilhaKeiko Takashima

Abstract

The adsorption of the diazo dye Direct Red 23 onto a zinc oxide surface at 30 degrees C in the dark was investigated. The color reduction was monitored by spectrophotometry at 503 nm. The FTIR and Raman spectra of the Direct Red 23 adsorption as a function of ZnO concentration were registered. From the PM3 semi-empirical calculations of the atomic charge density and dipole moment of the Direct Red 23 molecule, it was demonstrated that the azo dye molecule may be adsorbed onto the ZnO surface through molecule geometry modifications, enhancing the interfacial area causing a variation in the bonding frequencies.

Citations

Jan 29, 2013·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Selin Kinali-DemirciMustafa Kurt
Aug 18, 2012·Journal of Colloid and Interface Science·Fan ZhangWeijie Song
Aug 25, 2011·Journal of Hazardous Materials·Jing GuoYeqing Lan
Jul 24, 2014·TheScientificWorldJournal·Nurhidayatullaili Muhd JulkapliSharifah Bee Abd Hamid
Jul 14, 2011·Journal of Biomaterials Applications·Veeranuch SrakaewWanpen Tachaboonyakiat

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