Results showed that, in both processes, the activation time increased (from 30 to 90 minutes), total pore volume, indicators iodine and methylene blue index increased; while the performance of the process significantly reduced. In 90 minutes, only the iodine and methylene blue index of coal worth respectively 1149.8 mg / g and 225.7 mg / g for the samples CC6); while for the BCC sample value respectively 1000.8 mg / g, 168.5 mg / g. This is easy to see, when the activation time from 30 minutes to 90 minutes, the baby-size pores on the surface of coal will be eroded (ie volume fraction of micro-sized holes pumice fell from 76% to 51% for the sample CC6); the pores adjacent baby together into larger porous concrete expression through data in Table 5 when the volume hole size pumice meso increased by 23% to 48%, this leads to an increase in adsorption capacity of activated carbon; however, if further increases activation time, the circuit being pyrolysis carbon into ash clog the pores leading to reduced ability of activated carbon adsorption, this phenomenon has been mentioned in some previous studies That [7, 27, 28]. In summary, the activation time increases, improved coal quality; but also need to consider economic factors as time activation higher manufacturing costs and greater process efficiency significantly reduced. To facilitate comparisons, the relationship between performance and specific surface area of activated carbon over time is shown in the graph in Figure 6.
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