2019 年 44 巻 5 号 p. 165-169
This paper has investigated the influence of alkali treatment on the acidic functional groups of rice hull charcoal and investigated the relationship between its cesium and strontium adsorption ability. In the alkali treatment, rice hull charcoal carbonized from 400 to 1000 °C was immersed in a basic aqueous solution. The pH of the rice hull charcoal increased after alkali treatment. Furthermore, the alkali treatment of rice hull charcoal carbonized at 400 and 600 °C increased the adsorption of cesium and strontium. In the FTIR results, the OH band of alkali-treated rice hull charcoal was stronger than that of the untreated rice hull charcoal. The mesopore volume of alkali-treated rice hull charcoal increased. The alkali-treated rice hull charcoal showed an increased pH, increased negative charge, and cleaved lactone rings contained compared to the untreated sample. In addition, the valence of acidic functional groups increased, and the adsorption ability of cesium and strontium improved.