When the radon adsorption coefficient of activated carbon is constant,n is proportional to the concentration of radon. In this case, Equation (10) represents the functional relationship among the total number of activated carbon V, radon concentration and adsorption (or exposure) time. Therefore, the concentration of radon in the environment can be calculated according to the total number of activated carbon and adsorption time.Simulation calculation and result analysis of total number of activated carbon According to Equations (5) and (10), a computer program can be written to calculate the relationship between the total number of Y in the process of radon adsorption on activated carbon and the relationship between the total number of Y after the removal of activated carbon and the change of time.In order to verify the accuracy of the simulation calculation, two 12g activated carbon bags thickness of activated carbon ~ 1.5cm) were put into the container containing uranium ore, and then taken out after radon adsorption for 30 min and 85 min. After continuous measurement, the change curve of total Y number of activated carbon over time could be obtained.
According to the adsorption duration used in the experiment and the appropriate value of n (in the calculation process, when the adsorption duration is 30 min, n=480
When the adsorption time is 85 min, take n-600), and the calculated theoretical curve is shown in FigureIt can be seen from the figure that the measured curve is in good agreement with the theoretical curve.Fig. 2 is the simulation result of the total number of Y taken out over time after activated carbon adsorbs 1 radon atom from the environment every second and continues to adsorb for 3 days.After the activated carbon was taken out, the total number of V reached the maximum after t time, and then the total number became smaller. After about 50 min, the total number of V decreased by a negative exponential function.chengde wanyang activated carbon factory
The curve can be divided into a stationary area and a measuring area. The width of the stationary area (i.e. the duration of the stationary area) is set at (t+50) min, followed by the measuring area.
There is no obvious rule of counting in the standing zone. Should be avoided during this period of time.Total number of;The measurement area is counted bythe main performance of PAC is basically equivalent to 8818 type activated carbon;coconut shell granular activated carbon charcoal
The concentrations of heavy metals in activated carbon leaching solution of sludge were all qualified.Compared with domestic and foreign research reports, the quality of PAC is in the middle level.(5) Compared with SAC, the specific surface area of PAC is larger, up to 636.8m2·g'. PAC is mainly mesoporous, but also contains some micropores. The adsorption/desorption isotherm shows that PAC is activated carbon with parallel wall slit pore structure.Micropores at 2.0nm.Due to the pore structure of GAC, its adsorption speed is slow and its separation rate is not high. Especially, its physical form makes it inconvenient in application and operation, which limits the application range of GACACF is the third generation of activated carbon products after powdered and granular activated carbon products.Activated carbon fiber developed in the 1970s is a new and efficient adsorbent with the development of carbon fiber industry.
The characteristics of carbon fiberACF is a member of the porous carbon family with unique properties. Compared with the traditional granular activated carbon (GAC), ACF has the following characteristics: the pore structure of ACF and GAC is very different, as shown in Figure 1 and Figure 2.The pore distribution of ACF is basically monodispersed, mainly composed of micropores smaller than 2.0nm, and the pore openings are directly on the surface of the fiber. The diffusion path of the adsorbate to the adsorption site is short, and the fiber diameter is small. Therefore, the contact area with the adsorbed substance is large, which increases the adsorption probability and can be uniformly contacted.Activated carbon or chemical-loaded activated carbon is often used as a key component of personal protective equipment in the presence of toxic gases in the civilian industry. During the SARS crisis in late 2002 and early 2003, special protective masks with activated carbon loaded with silver played a role in protecting health care workers.
(4) deep purification treatment of tap water.Practice has proved that activated carbon is still has the best effect of the depth of water purification products, its dosage in recent | years show how multiple growth.
There is evidence that the next five years will be a rapid growth period for white water purification in China, and the demand for carbon for water purification will be a blowout development.(5). Deep purification treatment of industrial wastewater.
For example, the three-level decolorization of printing and dyeing wastewater, the removal of heavy metal ions from electroplating wastewater, the purification of papermaking wastewater and the removal of COD from petrochemical industrial wastewater to meet the discharge standards, activated carbon has been proved to be one of the most effective deep purification materials.