Kinetic Study of the Decolorization of Organic Dyes with Hydrogen Peroxide and TAML Catalyst Melissa - PowerPoint PPT Presentation

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Kinetic Study of the Decolorization of Organic Dyes with Hydrogen Peroxide and TAML Catalyst Melissa

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Title: Kinetic Study of the Decolorization of Organic Dyes with Hydrogen Peroxide and TAML Catalyst Melissa


1
Kinetic Study of the Decolorization of Organic
Dyes with Hydrogen Peroxide and TAML?
CatalystMelissa Medeiros and Dr. Chen-Lu
YangAdvanced Technology and Manufacturing Center
University of Massachusetts Dartmouth
Chapter Sigma Xi Scientific Research Society 12th
UMASS Dartmouth Research Exhibition April 25
26, 2006
RB19 Temperature Variation
Introduction
Oxidation of Colorants
Procedures used in both the textile and paper
industries are highly dependent on using vast
quantities of water. Each year approximately 53
billion gallons of wastewater results from
textile mills alone. The dye polluted wastewater
is then released to treatment facilities or to
surface waters. The current technologies
employed to remove the dyes are expensive and
high volumes of water are then needed to clear
the dye from the wastewater treatment regions.
Using hydrogen peroxide in conjunction with
Fe-TAML catalyst removes increased amounts of dye
from effluent and would allow manufacturers to
recycle their waste water for reuse within their
own facility.
  • Under the attack of oxidants, colorant chemical
  • structures can be destroyed.
  • ?breakup of conjugated double bonds
  • ?cleavage of electron donors or
  • electron receptors
  • Small molecules are produced
  • The end result is color removal

Reactive Blue 19 (RB19)
Reactions of H2O2
Dissociation reaction H2O2 ? HO2-
H Hydroxyl radical formation (D Donor)
H2O2 D ? D HO- HO. Perhydroxyl radical
formation H2O2 HO2- ? HO2. HO-
HO. Singlet oxygen formation HO2. ? OH-
O
Plot of ln(1-x) Versus Time
Arrhenius Plot
The Role of Iron
RB19 H2O2 Conc. Variation
Fe3 H2O2 ? Fe2 H HO2.
TAML
  • Slope -Ea / R
  • ? R 8.314 X 10-3 kJ mol-1 K-1
  • Ea 94.1 kJ / mol

Before and After
  • tetra-amido macrocyclic ligand
  • Are catalysts formed from the elements C, H, N,
    O, and Fe
  • The iron catalyst is a selective and efficient
    peroxide activator it
  • is also water soluble and effective in
    minuscule quantities.

RB19 TAML Conc. Variation

What Gives Dye Its Color?
  • Chemically, there are two main
  • structures Azo and
  • Anthroquinone, shown above.
  • - Conjugated double bonds
  • Chromophores usually electron-
  • receptors, unsaturated groups
  • Auxochromes usually electron-
  • donors, saturated groups

Conclusions
  • Color can be removed using this method
  • Design and Operation Parameters needed to
    engineer
  • system for dye color removal
  • ? 21 molar ratio of H2O2 with dye
  • ? 20 µL TAML per 100 mL dye
  • ? Most efficient temp. 40 C
  • ? Minimum Energy required to start
  • chemical reaction 94.1 kJ / mol

References
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