해양심층수로 개질한 바이오차의 물리화학적 특성과 수용액 중 인 흡착 효율

초록

Recently, biomass conversion of by-products into an eco-friendly bio-sorbent such as biochar has been recognized as a promising product to maintain or increase soil productivity, reduce nutrient losses, and improve water purification in the ecosystem. In this study, four different types of biochar pyrolyzed at 500°C (RH: rice husk, BS: bean straw, PS: potato stem, RPS: red pepper stem) were chemically modified through two different methods (RW: raw deep sea water, CW: concentrated deep sea water). Changes in the physicochemical (surface area, elemental compositions, functional group) and morphological (SEM) properties of the modified biochar were measured, and the phosphate adsorption capacity in an aqueous solution was compared and evaluated. The improvements in the biochar properties varied for different feedstock and modification methods. In particular, the surface area of RH was the largest compared to other biochar, and CW modification caused substantial changes in the surface area and functional groups. The adsorption quantities of phosphate by modified biochar were 0.136 and 0.164 mg/g for RH_RW and RH_CW, respectively, and their corresponding adsorption quantities were 0.34 and 0.46 times higher than that of RH. Overall, it was determined that chemically modified biochar using deep sea water is suitable for removing phosphate in an aqueous condition.

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