remediation of wastewater containing heavy metals using raw and modified diatomite
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REMEDIATION OF WASTEWATER CONTAINING HEAVY METALS USING RAW AND MODIFIED DIATOMITE

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REMEDIATION OF WASTEWATER CONTAINING HEAVY METALS USING RAW AND MODIFIED DIATOMITE. Milo š T. Nenadović. The main goal. To investigate structural changes in diatomite Changes caused by mechanical milling with magnesium hydride

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remediation of wastewater containing heavy metals using raw and modified diatomite

REMEDIATION OF WASTEWATER CONTAINING HEAVY METALS USING RAW AND MODIFIED DIATOMITE

Miloš T. Nenadović

the main goal
The 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 diatomite
There are two types of raw diatomite
  • The first one is

CYLINDRICAL

the second one has rod like particles
The second one has rod like particles
  • 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 changes
Structural changes
  • This is the sample MgH2-diatomite composite
  • Ratio MgH2 : diatomite = 90 : 10
structural changes7
Structural changes
  • This is also MgH2 – diatomite composte but ratio between this two constituents is
  • MgH2 : diatomite =

10 : 90

structural changes8
Structural 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 analisys
XRD 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.
conclusion
Conclusion
  • 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.
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