ヒ素超蓄積植物モエジマシダバイオマスを利用した新規環境浄化資材の開発

Abstract

Phytoremediation, an environmental remediation method using plants, is expected to be applied to the arsenic(As) and cadmium(Cd) pollution that is becoming more serious worldwide. However, one of the challenges is the treatment of biomass containing toxic elements after remediation. In this study, we investigated the effective use of biomass resources by converting the arsenic hyperaccumulator, P. vittata, into biochar that is expected to adsorb toxic elements. In fact, plant biomass containing arsenic was calcined at 600, 800, and 1200°C to evaluate its surface structure and adsorption performance for As and Cd. calcination at 1200°C increased the specific surface area of biochar, but did not significantly affect its adsorption capacity for toxic elements. The calcined biochars showed approximate 90% and 95% adsorption rates for As and Cd, respectively, indicating that the calcined biochars had very high adsorption capacity and the adsorption amount per unit weight biochar was 450 mg/ g-biochar for both elements.