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Removal of Methylene Blue from Aqueous Solution

Published on Nov 30, 2023


Adsorption is a very significant and very effective separation technique used because of less initial cost, simplicity of design, ease of operation and insensitive to toxic substances. Activated carbon is the most efficient absorbent used for dye removal. But it is very expensive to produce and regenerate.Activated carbon has been used as adsorbent for the removal of odour and turbidity from effluents of different wastewater treatment facilities. Activated carbon can be used in powdered form or granulated form.

Most of industries and institutions practice an elaborate effluent and sewage treatment protocol which affects the overall economy of the plant. A conventional continuous flow process requires multiple structures and extensive pumping and piping systems. The need of the hour is a suitable technology for efficient and cost-effective tertiary treatment for recycling or reusing at least a reasonable quantity of the wastewater produced in the plant.

Keywords : Cashew nut shell, activated carbon, methylene blue, secondary waste water, Industrial effluent.


 An approach of preparing Methylene Blue and treating it with activated carbon.

 Developing a cost efficient activated carbon for secondary waste water treatment.


Preparation of activated carbon

 The CNSC was washed and sun-dried to remove traces of oil and dust particles and was weighed.

 CNSC shell was kept in muffle furnace and heated at 400ºC for 10 minutes.

 Then the activated carbon formed was roughly crushed and sieved for 10 minutes.

 Particle sizes of 150μm, 90μm and 75μm were used in the experiments.

Preparation of Methylene Blue Solution

 Different concentrations of methylene blue were prepared i.e., 5ppm,10ppm, 20 ppm, 30ppm, 40ppm and 50ppm was prepared by dissolving required amount of dye powder in distilled water.


Methylene Blue


The activated carbon prepared by using cashew nut shell has been effective in removing methylene blue dye from the methylene blue dye solution. The activated carbon was also useful to treat the secondary waste water but it was not effective when compared to the conventional method.

Future Scope:

The future scope of the project can be following:

 The removal of methylene bluedye from an aqueous solution can be tried by increasing the agitation time and by decreasing the sieve sizes.

 By varying the pH of aqueous solution an attempt can be made for the removal methylene blue from aqueous solution.

 Disposing of waste material and hazardous material has become a major concern now-a-days so the better alternative for this will be desorption and regeneration of activated carbon.

 An attempt can be made for the removal of other dyes such as methyl green or any other harmful dye which are being used in textile industry by using cashew nut shell as the activated carbon.

Project Done By Ms. Chaitra M., Ms. Prarthana Rai, Mr. Lohith Kamath