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Volume 3, Issue 2 (Suppl) Ind Chem
ISSN: 2469-9764, ICO an open access journa Industrial Chemistry 2017
May 22-23, 2017
May 22-23, 2017 Las Vegas, USA
2nd World Conference on
Industrial Chemistry and Water Treatment
Preparation and characterization of chitosan coated diatomaceous earth for hexavalent
chromium removal
Suhaib S Salih and Tushar K Ghosh
University of Missouri, USA
Hexavalent chromium is not biodegradable in nature and has a great effect on ecosystem and human health. Batch and
continuous fixed-bed column studies for Cr (VI) removal from aqueous solutions were carried out by using chitosan
coated diatomaceous earth as an adsorbent. The adsorbents were characterized by FTIR, TGA, BET, XPS, SEM, EDS and
zeta potential (located at University of Missouri-Columbia, Missouri). The effects of pH-solution, initial ion concentration,
temperature, flow rate and the contact time were examined. Results revealed that Cr (VI) adsorption was found fitting well with
Langmuir model indicating monolayer adsorption. The adsorption of Cr (VI) onto adsorbent behaves as a pseudo-second-
order models rather than the pseudo-first order model and found to have fast kinetics in the first 60 min and then the rate
slowed down as equilibrium was approached. The increase of temperature has a negative effect on chromium adsorption which
decreases the Cr (VI) removal from 1.62 to 1.44 mmole/L when it rise from 283 to 313 K. Thermodynamic parameters such
as ΔGo, ΔHo, ΔSo and ΔHx indicated the suitability of adsorbent towards the removal of Cr (VI). The maximum chromium
uptake in batch adsorption was 1.62 mmole/g or 84.23 mg Cr/g at pH 3, initial ion concentration 1000 ppm, and temperature
283 K. However, a forward breakthrough point is decreasing exhaustion time with increasing the flow rate of solution in
dynamic process. Recovery of the Cr (VI) ions was made by passing 0.2 MNaOH solution through the exhausted columns and
about 91.2% of chromium was de-adsorbed from the bed column. Results indicate that the sustainable, abundant, low-cost
adsorbent, chitosan coated diatomaceous earth, can be considered as economically applicable for the removal of Cr (VI) from
aqueous solutions.
Biography
Suhaib S Salih is currently pursuing PhD and is a Research Assistant at the University of Missouri-Columbia majoring in Chemical Engineering. His PhD work
is on industrial wastewater treatment under the supervision of Dr. Tushar K Ghosh. He has received his BE and MSc degrees in Chemical Engineering from the
University of Tikrit, Iraq. He later joined the Department of Chemical Engineering, University of Missouri-Columbia as a PhD Scholar. His current research interest
is in Adsorption Processes. He has expertise in lab management, operation of atomic absorption spectrophotometer, infrared spectrophotometer, ultra violet
spectrophotometer and HPLC spectrophotometer.
Suhaib S Salih et al., Ind Chem 2017, 3:2 (Suppl)