3.2.1. Effect of the carbonization

3.2.1. Effect of the carbonization temperature
The carbonization temperature is a very important parameters which
affects the physical characteristics of the activated carbon. Grape stalk
consists of hemicellulose, cellulose and lignin. In order to obtain activated
carbon from this kind of material, these polymers must be decomposed
by effect of the temperature. It has been reported that the decomposition
of hemicellulose and cellulose occur in the temperature ranges of
180–240 and 230–310, respectively [27], but lignin began decomposition
at a wide temperature range of 150–750 °C, furthermore, the
rate of its decomposition is slow [28,29]. In light of this information,
the effect of the carbonization temperature was investigated in the
range of 500–700 °C. The obtained results are given in Table 2.