Paper Title
BEAD TYPE IRONOXIDE NANOPARTICLES IMPREGNATED HYDROCHARFOR STABILIZATION OF ARSENIC AND HEAVY METALS IN CONTAMINATED SOIL

Abstract
Bead type soil amendment using iron oxide nanoparticles impregnated hydrochar(IOHC/bead)was prepared to improve the existing disadvantages of the biochar amendment such as potential wind loss and low stabilization efficiency for As in the contaminated soil. The purpose of this study is to develop the amendment for stabilization of As and heavy metals in contaminated soil and evaluate the characteristics of stabilization performance ofINPBC/bead. Hydrothermal carbonization of lignocellulosic biomass and ferric nitrate solution as a precursor of iron nanoparticles was followed by calcination process. For characterization of IOHC/bead, various analytical technique such asFTIR, XRD, BET, TEM, XPSwere used. The particle size range of IOHC/bead was 1-4 mm, and different oxygen-containing functional groups and Fe3O4 crystalline phase were observed on the surface. The soil contaminated by As and heavy metals was sampled from the abandoned mine in South Korea for the cultivation test. During the cultivation test, IOHC powder and IOHC/bead were applied with the ratios of 2.5, 5% and the stabilization was proceeded for 4 weeks. TCLP,SPLPextraction method were used to determine the hazardous of contaminants from the soil.The extraction method revealed that stabilization efficiency was increased with the increasing application ratio of amendments. And the significant difference of stabilization efficiency between the types of amendment was not observed. IOHC/bead that can maintain pH of origin soil and the minimize wind loss while the cultivation duration can be a suitable amendment for soil contaminated by arsenic and heavy metals. Acknowledgement - This research was supported byIndustry-University Collabo R&D project funded by the Korea Technology and information Promotion Agency for SMEs(S2910834) Keywords - Biochar, Hydrochar, Stabilization, Alginate Bead, Contaminated Soil