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REMOVAL OF RHODAMINE B FROM AQUEOUS
SOLUTION USING COCONUT COIR PITH AS ANADSORBENT
under the guidance of
Dr. R.Gandhimathi
Done by :
1.Billa Manasa Reddy
2.Kavya sharma
3. Mainowshree Boro
4. Shamma Anna Jacob
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OBJECTIVES
To investigate the efficiency of coconut coir pith for theremoval of Rhodamine B dye from waste water.
To investigate the effects of contact time, adsorbent
dosage, pH on dye removal efficiency.
To investigate the adsorption mechanisms throughkinetic models.
To quantify the adsorption equilibrium through Langmuir
and Freundlich isotherms.
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Introduction
Materials used
Adsorbate: Rhodamine B dye
Adsorbent: Coconut Coir Pith
What is Rhodamine B? What are its uses?
Why the removal of Rhodamine B?
Ref: Wikipedia.org
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Materials used contd
Why Coconut Coir pith is used as adsorbent?
The coir pith is sieved through a 300 micron sieve and
retained on a 150 micron sieve.
Unsieved Sieved
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Work Done
Performed Trials for phosphate removal by adsorption
using various adsorbents .
Removal Efficiency not sufficient .
Started new project on Removal of Rhodamine B dyefrom aqueous solution using adsorption by coconut coir
pith.
Experiments performed :
Effect of contact time
Effect of Dosage
Kinetic models for contact time
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Experimental Procedure
Preparation of stock solution:
Take 1g of Rhodamine B and add it to 1000 ml of
distilled water. A solution of concentration 1000 mg/l is
obtained.
Preparation of Reference samples:
Take 10 ml of 1 g/l solution and dilute it to 100 ml. This
solution has a concentration of 100 mg/l.
Further take 50 ml of this solution and dilute it to 500 ml.A solution of 10 mg/l is obtained.
Similarly, samples of concentration 2,4,6,8 mg/l are
prepared and a calibration curve is obtained.
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Peak Wavelength Graph
for Rhodamine B
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CALIBRATION CURVE
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Effect of contact time
25 mg of coconut coir pith is added to 50 ml of the 10
mg/l solution. 11 such samples are prepared.
All samples are put in the shaker for the respective
timings-5,10,15,20,30,45,60,90,120,150 and 180 mins.
They are later centrifuged at 1000 rpm and the obtained
supernatants are tested for Rhodamine B concentration
using a UV Spectrophotometer.
The equilibrium contact time is established.
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Effect of contact time
Adsorption increases with
increase in the contact time
Initially adsorption was low
but increases with time
quickly.
Optimum contact time : 60
min (Qe )
Removal efficiency at Qe =
83.85 %
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Effect of dosage of theadsorbent
Prepare samples with different doses of coconut coir
pith-10,20,30,40,50,60,70,80,90,100 mg/ 50 ml.
Put these samples in the shaker for 60 min (equilibrium
contact time).
Centrifuge the samples at 1000 rpm and measure the
concentration of the supernatants using a UV
Spectrophotometer.
The optimum dosage of the adsorbent is obtained.
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Effect of dosage
Removal efficiency
increases with the
increase in Coir pith
dosage.
Optimum dosage : 2.5
gm/L with Removal
efficiency of 98%.
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Colour change in the sample
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ADSORPTION KINETICS
In order to clarify the adsorption process, adsorptionmodels were applied to evaluate the experimental data.
Adsorption Models :
1. Lagergrens pseudo first order kinetic model
2. Lagergrens pseudo second order kinetic model.
The pseudo first order equation is generally expressedas :
log(Qe-Qt) = log Qe (k1/2.303)t
Where Qe and Qt are the adsorption capacity atequilibrium and at time t, respectively(mg/g), k1 is therate constant of pseudo first order.
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The pseudo second order equation is expressed as :
(t/Qt) = (1/(k2Qe) + (t/Qe)
Where k2 is the rate constant of pseudo second order.
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Kinetic Models
Pseudo 1st Order Kinetics Pseudo 2nd Order Kinetics
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Kinetic Constants
Dye Pseudo 1st order
coefficients
Pseudo 2ndorder
Coefficients
Qe exp
(mg/g)
Qe
(mg/g)
k
(1/min)
R Qe
(mg/g)
k
(g/mg/m
in )
R
Rhoda
mineB
19.7 0.0368 0.914 18.4 0.021 0.999 17.61
Conclusion : It follows Pseudo 2nd order kinetics.
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Future Plans
Experiments to be conducted :
Effect of pH
Adsorption Isotherms
Properties of Adsorbents :1. Zero point charge
2. Specific gravity
3. Particle size
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REFERENCES
1. Residual oil and suspended solid removal using natural adsorbents
chitosan, bentonite and activated carbon: A comparative study by
A.L. Ahmad, S. Sumathi, B.H. Hameed.
2. Removal and Recovery of the Hazardous Azo Dye Acid Orange 7
through adsorption over Waste Materials: Bottom Ash and De-Oiled
Soya by Alok Mittal, Vibha Gajbe, and Jyoti Mittal.
3. Adsorption of basic dye (methylene blue) onto activated carbon
prepared from rattan sawdust by B.H. Hameed*, A.L. Ahmad,
K.N.A. Latiff.
4. A novel agricultural waste adsorbent for the removal of cationic dyefrom aqueous solutions by B.H. Hameed, R.R. Krishni, S.A. Sata.
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THANK YOU