How to test the iodine value of coconut shell activated carbon

  • Carrie Ge
    December 28, 2020
    We know that the physical and chemical indicators to measure the quality of an activated carbon include iodine value, methylene blue value, CTC, strength, ash and other parameters. coal activated carbon pellets Among them, the iodine value is one of the important parameters of the adsorption capacity of reactive activated carbon. Today we will talk about coconut shell activated carbon. Specific test method of iodine value.

    The principle of coconut shell activated carbon iodine value test: after a certain amount of coconut shell activated carbon sample and iodine solution are absorbed by shaking, filter, take the filtrate, and titrate the residual iodine in the filtrate with sodium thiosulfate solution. When the residual iodine concentration is 0.02mol/L, the amount of iodine absorbed per gram of carbon (in milligrams) is defined as the iodine value, and the unit of the iodine value is mg/g

    The test steps of coconut shell activated carbon iodine value:

    Take a number of samples and place them in a sealed sample preparation crusher for crushing, then take the samples that have passed the 200-mesh sieve and put them in an oven, and dry them at 150°C to a constant weight. Weigh 0.50g of the sample and put it in a dry 250ml Add 10.0ml of hydrochloric acid (5wt%) to a conical flask with a stopper to make sure the sample is fully moistened. Place it on an electric furnace and heat it to boiling, slightly boiling (30±2)S. After cooling to room temperature, add 50.0 ml calibrated iodine standard solution. Stopper the bottle immediately. Shake on a shaker for 15 minutes and quickly filter into a dry bosom.

    Use a pipette to absorb 10ml of the filtrate, put it in a 250ml wide-mouthed Erlenmeyer flask filled with 100ml of distilled water, titrate with the calibrated sodium thiosulfate standard solution, when the solution is light yellow, add 2ml of starch indicator solution, continue The measurement makes the solution colorless, and the volume of sodium thiosulfate used is recorded.