Potassium hydroxide high temperature modified corn straw charcoal and lead ions adsorption study

摘要

In this paper, the effects of potassium hydroxide concentration, soaking time, activation time, activation temperature and heating rate on the adsorption performance of corn straw were studied by using potassium hydroxide as activator and high temperature modification of corn straw activated carbon. The optimum conditions were as follows: the solid-liquid ratio of straw carbon to potassium hydroxide solution was 1: 4, the immersion time was 24 h, the concentration of potassium hydroxide was 0.9 g/ml, the activation time was 2 h, the activation temperature was 800 °C and the heating rate was 5 °C/min The The iodine adsorption value of the corn straw straw was 899.38mg/g, which was obviously better than that of the commercial activated carbon.