Study on Preparation Conditions of Modified Sludge Biochar Based on Orthogonal Experimental Design
In order to further improve the adsorption capacity of sludge-based biochar,zinc chloride mixed with a specific proportion of sulfuric acid was used as an activator in this study to carry out the study on the preparation of sludge-based biochar.Through the orthogonal test results,it can be seen that the order of the influence of dif-ferent preparation conditions on the iodine adsorption value of biochar is:carbonization temperature＞the ratio of sulfuric acid to activator＞carbonization time＞activator concentration;According to the influence of different preparation conditions on the yield,the best combination of preparation conditions is obtained as follows:carbon-ization temperature is 500 ℃;the ratio of activating agent sulfuric acid is 60％;carbonization time is lh,and the concentration of activating agent is 3 mol/L.The iodine adsorption value of the modified sludge-based biochar prepared under the combined conditions is 516.68mg/g,and the yield is 70.25％.
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