Published on Nov 30, 2023
Colour removal from waste water has been a matter of concern,both in the aesthetic sense and health point of view.Colourremoval from textile effluents has been given much attention because of its potential toxicity and its visibility problem. There have been various promising techniques for the removal of dyes from waste water. However,the effectiveness of adsorption for dye removal from waste water had made it an ideal alternative to other expensive treatment methods.This project investigates the analysis of removal of synthetic dyes from aqueous solutions by adsorption on activated carbon prepared by chemical activation of teak leaves and banana trunk .In order to establish the removal capacity of this method of adsorbent different models of isotherms and adsorption kinetics are to be fitted to the experimental data.Dyes are extensively used in many industries such as textiles, leather, paper, wool, printing and cosmetics.
The release of waste water containing dye compounds into water resources has caused severe environmental impact. Methylene Blue (MB) used in some of the textile industries has adverse impact on the flora and fauna and aquatic ecosystems. Therefore, it is essential to minimize the number of dyes to the lowest possible limit approved by the environment and health agencies.
Keywords : Activated carbon, teak leaves, banana trunk, chemical activation, adsorption capacity.
1. To prepare the activated adsorbent from teak leaves and banana trunk.
2. To study & evaluate the efficiency of the activated teak leaves & banana trunk in the removal of synthetic dye through batch experiments.
3. To analyze the adsorption isotherm & to identify the suitable isotherm.
The materials used in the present investigation are Teak leaves (Tectonagrandis) Banana trunk (Musa) (Adsorbents), Methylene blue dye, 0.1 N –HNO3 (nitric acid), 98% H3PO4 (orthophosphoric acid) ) (Chemicals). The apparatus used are Hot air oven, Muffle furnace, Magnetic stirrer, Centrifuge and Photoelectric Colorimeter.
1. Low cost activated carbon was prepared from the TEAK LEAVES and BANANA TRUNK, for the removal of Methylene Blue wastes.
2. The teak leaves were collected form our college campus and washed repeatedly until the dirt was eliminated and was left for sundry.
3. The banana trunk was purchased from the market and it was cut to smaller pieces and was left to sundry.
4. Then after completely achieving dry state, they were grinded to powdered form and thensieved to the required particle size.
5. The adsorbent in powdered form was water washed to remove dust particles.
6. Then after filtering and separating them, they were activated with 0.1N HNO3 and orthophosphoric acid for teak leaves and banana trunk respectively
7. The adsorbent was oven dried at 110 ̊C and then they were placed at muffle furnace for 410 ̊C and 770 ̊C for teak and banana trunk respectively
8. Time for teak was 40 min and banana trunk was 90 min.
9. A batch experiments were carried out in order to investigate the effect of various parameters.
10. The various parameters tested are 1. Particle size 2. Effective Dosage 3. Contact Time and 4.Optimum pH.
11. Once the adsorbent was prepared, it was added to 100 ml of stock solution and placed on the magnetic stirrer for a contact time of 30 min and the pH was 8.24
12. Then to test the optical density of the treated stock solution, the sample was placed in the centrifuge for 10 min at a 3500 rpm so that the adsorbent particles get separated from the treated solution.
13. Photometric colorimeter was used for the analysis of finalconcentration of the effluent.
These adsorbents can be used to remove detergents and traces of MB from medicine wastes.
These adsorbents can be used to remove heavy metals.
These adsorbents can also be used to remove various types of dyes other than that of MB.
Study can be done on fate of waste (use of adsorbent waste generated in future).
From the above results it can be concluded that the efficiency of banana trunk adsorbent (Musa) is comparatively higher than that of the teak leaves (Tectonagrandis). This is based on the test parameter no: 2 ie; test for effective dosage. The quantity of the adsorbent required in case of tectonagrandis is 100mg and to that of musa is 50mg for the same volume of the effluent sample (100ml). It is seen that only half the quantity of musa adsorbent is required for the same volume of effluent dye degradation. Thus, banana trunk adsorbent (musa) is much more efficient than teak leaf (tectonagrandis).
