3.1. Preparation conditions of LSAC on the adsorption
The equilibrium adsorption capacities of Cr(VI) on LSAC prepared at different conditions and the range analysis were listed in Table 2. The range analysis was used to clarify the significance levels of different influencing factors on the adsorption capacity of Cr(VI) on LSAC. The K value for each level of a parameter was the average of three values shown in Table 2, the range value, R, for each factor was the difference between the maximum and minimum value of the three levels, and the squareof deviation (S) of three levels for each factor was also calculated. [53,54] According to the results of range analysis and the square of deviation, the significance sequence of the four investigated influencing factors was obtained and the order was as follows: the mass ratio of carbonized material to NaOH, carbonization temperature, activation temperature and activation time. It can be concluded that the mass ratio of carbonized material to NaOH has significant influences on the adsorption capacity of Cr(VI) on LSAC and the optimal condition is A2B3C1D2 (Exp. no. 6). Moreover, two experiments were carried out at the optimal condition to validate the results of the range analysis, and the equilibrium adsorption capacity of Cr(VI) were 28.46 and 28.93 mg/g, respectively, which meaning the range analysis is reliable. Therefore, LSAC, prepared by Exp. no. 6 at a carbonized material/NaOH ratio of 50%, carbonization temperature of 350 8C, activation time and activation temperature of 1.5 h and 600 8C, respectively, was chosen as the suitable for adsorbing Cr(VI) throughout all the remaining adsorption experiments
3.1 การเตรียมเงื่อนไข LSAC ในการดูดซับThe equilibrium adsorption capacities of Cr(VI) on LSAC prepared at different conditions and the range analysis were listed in Table 2. The range analysis was used to clarify the significance levels of different influencing factors on the adsorption capacity of Cr(VI) on LSAC. The K value for each level of a parameter was the average of three values shown in Table 2, the range value, R, for each factor was the difference between the maximum and minimum value of the three levels, and the squareof deviation (S) of three levels for each factor was also calculated. [53,54] According to the results of range analysis and the square of deviation, the significance sequence of the four investigated influencing factors was obtained and the order was as follows: the mass ratio of carbonized material to NaOH, carbonization temperature, activation temperature and activation time. It can be concluded that the mass ratio of carbonized material to NaOH has significant influences on the adsorption capacity of Cr(VI) on LSAC and the optimal condition is A2B3C1D2 (Exp. no. 6). Moreover, two experiments were carried out at the optimal condition to validate the results of the range analysis, and the equilibrium adsorption capacity of Cr(VI) were 28.46 and 28.93 mg/g, respectively, which meaning the range analysis is reliable. Therefore, LSAC, prepared by Exp. no. 6 at a carbonized material/NaOH ratio of 50%, carbonization temperature of 350 8C, activation time and activation temperature of 1.5 h and 600 8C, respectively, was chosen as the suitable for adsorbing Cr(VI) throughout all the remaining adsorption experiments
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