ADSORPTION OF MICROPOLLUTANTS BY ZEOLITES

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• ADSORPTION OF MICROPOLLUTANTS BY ZEOLITES

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GOAL

• The aim of this project is to see which molecular
  properties have an influence on the adsorption of
  micropollutants on zeolite.
• Hydrophobicity, polarisability, pi-pi bond, size.

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SUMMARY

• What is a zeolite ?
• Why zeolite should they be useful for
  micropollutants removal
• Others authors findings in the use of zeolite as
  adsorbent.
• Experiments

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WHAT IS A ZEOLITE ?
AlO4 and SiO4 tetrahedra are corner sharing.
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WHAT IS A ZEOLITE ?
The presence of aluminium results a negative
charge of the zeolite's framework. The negative
charge is balanced by cations which can move very
easily, even replaced...
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WHAT IS A ZEOLITE ?

• This connection between SiO4 and AlO4, give to
  the zeolite a framework, with pore and internal
  cavity.

The Si/Al ratio has an important effect on the
behaviour of the zeolite.
ZSM-5
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Why zeolite should they be useful ?

• The most important consideration is the molecular
  sieving.

Avoiding adsorption competition.
Strong electric field because of presence of
aluminium. Polarizing power increase with Al.
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Why zeolite should they be useful ?
Adsorption to the right easier than to the left
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Others authors findings
The log k o/w of MTBE is 0,94
1mg/L
The Y aeolite is the most hydrophilic zeolite. It
has the worst efficiency .
Adsorption competition between water and
MTBE. Smallest is the pore and better is the
adsorption.
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Others authors findings
NDMA
NPYR
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Experiments

• Zeolite we use for experiments are
• ZSM-5, pore size 5,3-5,6 Angstrom, Si/Al 80
• Y silicalite, pore size 7,4 angstrom, Si/Al
  80
• PAC (GAC 830 P) as reference

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Experiments

• Batch experiments
• Contact time of 24h to rach the equilibrium time.
• Samples are filtred with an acetate cellulose
  filter of 0,45 um.

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Experiments
Yellow set
Green set
Blue set
SW
DW
SW
DW
SW
DW
Zsm-5
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5
7
5
7
5
7
5
7
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Y silicate
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5
7
7
5
5
7
5
GAC
SW (mg) 200, 100, 70, 50, 20, 10, 0 DW (mg)
100, 50, 25, 10, 0
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Experiments
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Experiments

• What are we expecting ?

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Experiments
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• THANK YOU FOR YOUR ATTENTION
• QUESTIONS?