Wooden raw materials mainly include walnut shell 6.7, wood I8]I9], fruit shell [10.11], bamboo [213], crop straw 14.15], carbon containing waste residue 16][I7, etc. In addition, good quality granular activated carbon can also be prepared by separating charcoal powder 8 with dust removal ash and waste polystyrene foam.yrdcarbon
Preparation method of granular activated carbon is mainly physical activation method [12 and chemical activation method [3.821]. Physical activation method is to dry, carbonized materials will be first, and then carbonized material crushing, then add to the crushing carbonized material, the binder and its mixing, forming and drying grain charcoal, then the granular activated carbon under a certain temperature, the final results of dry granular activated carbon products. The method commonly used activation main gas water vapor and carbon dioxide [20] [l ⒂ 5]. The physical activation method is characterized by high activation temperature (generally at about 900 ℃), the equipment investment is large, step trival,
But the pollution to the environment is relatively small.https://www.yrdcarbon.com/products/activated-carbon/activated charcoal powder wholesale
Chemical activation method is to mix raw materials with chemicals in a certain proportion, impregnation for a period of time, kneading and plasticizing at an appropriate temperature, and then carbonization and activation are completed in one step.
The chemicals commonly used are ZNC12, H5PO and KOH.
At present, more research is done on H;
PO4 activation method, the technological process is shown in Figure 1-2.
Chemical activation process is characterized by low activation temperature (generally 400-600℃), easy to adjust the pore structure of the product.
In the process of adsorption, the specific surface area of activated carbon plays a major role.
At the same time, the solubility of the adsorbed substance in the solvent also directly affects the adsorption speed.
In addition, pH, temperature changes and the degree of dispersion of the adsorbed substances also have certain effects on the adsorption rate.
The adsorption of impurities in the water by activated carbon has both physical adsorption and chemical adsorption.