REMEDIATION OF WASTEWATER REMEDIATION OF WASTEWATER CONTAINING HEAVY METALS USING CONTAINING HEAVY METALS USING

RAW AND MODIFIED DIATOMITERAW AND MODIFIED DIATOMITE

Miloš T. Nenadović

The main goalThe main goal

To investigate structural changes in diatomite

Changes caused by mechanical milling with magnesium hydride

It is very important to know what is going on with lattice parametar of Mg-hydride.

There are two types of raw There are two types of raw diatomitediatomite

The first one is

CYLINDRICAL

The second one has rod like The second one has rod like particlesparticles

This two diatomites has the same chemical structure, but configuration is tottaly different.

Diatomite is completly natural product!!!

What is happened next?What is happened next?

Magnesium hydride was premilled for 10 hours

Then diatomite was added and the milling was performed for another 1 hour.

Milling speed of 850 rpm was chosen for the purpose of this study

And then we have got something like this!!!!

Structural changesStructural changes

This is the sample MgH2-diatomite composite

Ratio MgH2 : diatomite = 90 : 10

Structural changesStructural changes

This is also MgH2 – diatomite composte but ratio between this two constituents is

MgH2 : diatomite =

10 : 90

Structural changesStructural changes

We can see some changes in the structure of diatomite and Mg-hydride

It is strongly depend of the ratio of constituents

The sample with 90 % of diatomite shows sponge like structure

It is better for sorption of heavy metals

XRD analisysXRD analisys

It shows very close moving to the smaller values of 2Θ angle.

That is very important because it proves increasing of the lattice parameter.

Better removal capacity.

ConclusionConclusion

Investigation demonstrated that diatomite has a higher removal capacity for Pb2+, Ni2+, Cu2+, Hg2+ and Cd2+ from water than untreated diatomite. The adsorption capacity of modified diatomite increased by decreasing the quantity of magnesium hydride deposited on the surface.