ADSORPTION OF MICROPOLLUTANTS BY ZEOLITES

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.

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

WHAT IS A ZEOLITE ? AlO4 and SiO4 tetrahedra are corner sharing.

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...

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

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.

Why zeolite should they be useful ? Adsorption to the right easier than to the left

Others authors findings The log k o/w of MTBE is 0,94 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. 1mg/L

Others authors findings NDMA NPYR

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

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

Experiments Yellow setGreen setBlue set SWDWSWDWSWDW Zsm-5 Y silicate GAC SW (mg) : 200, 100, 70, 50, 20, 10, 0 DW (mg) : 100, 50, 25, 10, 0

Experiments

What are we expecting ?

Experiments

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