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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