In-situ evaluation of dye adsorption on TiO2 using QCM

Besharat, ZahraKTH,Materialfysik, MF,Yt- och korrosionsvetenskap,KTH Royal Inst Technol, Dept Chem, Div Surface & Corros Sci, S-10044 Stockholm, Sweden.;KTH Royal Inst Technol, Mat Phys, ICT, S-16440 Stockholm, Sweden. (författare)

QC 20190514
We measured the adsorption characteristics of two organic dyes; triphenylamine-cyanoacrylic acid (TPA-C) and phenoxazine (MP13), on TiO2, directly in a solution based on quartz crystal microbalance (QCM). Monitoring the adsorbed amount as a function of dye concentration and during rinsing allows determination of the equilibrium constant and distinction between chemisorbed and physisorbed dye. The measured equilibrium constants are 0.8 mM(-1) for TPA-C and 2.4 mM(-1) for MP13. X-ray photoelectron spectroscopy was used to compare dried chemisorbed layers of TPA-C prepared in solution with TPA-C layers prepared via vacuum sublimation; the two preparation methods render similar spectra except a small contribution of water residues (OH) on the solution prepared samples. Quantitative Nanomechanical Mapping Atomic Force Microscopy (QNM-AFM) shows that physisorbed TPA-C layers are easily removed by scanning the tip across the surface. Although not obvious in height images, adhesion images clearly demonstrate removal of the dye.

Alvarez-Asencio, RubenKTH,Yt- och korrosionsvetenskap,KTH Royal Inst Technol, Dept Chem, Div Surface & Corros Sci, S-10044 Stockholm, Sweden.;IMDEA Nanociencia, Inst Adv Studies, Faraday 9,Campus Cantoblanco, Madrid 28049, Spain.(Swepub:kth)u1u6jl5f (författare)
Tian, Haining,1983-Uppsala universitet,Fysikalisk kemi(Swepub:uu)haiti806 (författare)
Yu, S.KTH Royal Inst Technol, Dept Chem Fiber & Polymer Technol, S-10044 Stockholm, Sweden. (författare)
Johnson, C. MagnusKTH,Yt- och korrosionsvetenskap,KTH Royal Inst Technol, Dept Chem, Div Surface & Corros Sci, S-10044 Stockholm, Sweden.(Swepub:kth)u1swbnpr (författare)
Göthelid, MatsKTH,Materialfysik, MF,KTH Royal Inst Technol, Mat Phys, ICT, S-16440 Stockholm, Sweden.(Swepub:kth)u1uq5dqb (författare)
Rutland, Mark W.KTH,Yt- och korrosionsvetenskap,KTH Royal Inst Technol, Dept Chem, Div Surface & Corros Sci, S-10044 Stockholm, Sweden.(Swepub:kth)u1ml9bxf (författare)
KTHMaterialfysik, MF (creator_code:org_t)

Av författaren/redakt...: Besharat, Zahra; Alvarez-Asencio, ...; Tian, Haining, 1 ...; Yu, S.; Johnson, C. Magn ...; Göthelid, Mats; visa fler...; Rutland, Mark W.; visa färre...

Om ämnet

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.