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자료유형
학위논문
저자정보

장정윤 (한양대학교 )

지도교수
김선준
발행연도
2023
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한양대학교 논문은 저작권에 의해 보호받습니다.

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This work explored the effects of amending nano Fe(III) oxide (FO) on the syngas (H2 & CO) generation during pyrolysis of spent coffee ground (SCG) and on the biochar properties for the removal of potentially harmful elements [PHEs: Sb(V), Cd(II), Cr(VI) and Ni(II)] in aqueous solution. Amendment of FO led to 153 and 682% increase of H2 and CO, respectively, presumably due to enhanced thermal cracking of hydrocarbons and oxygen transfer reaction mediated by FO. Incorporation of FO in pyrolysis successfully created porous structure in the produced biochar. The adsorption tests revealed that the biochar exhibited bi-functional capability to remove both positively charged Cd(II) and Ni(II), and negatively charged Sb(II). The adsorption of Cd(II) and Ni(II) was hardly deteriorated in the multiple adsorption cycles, and the adsorption of Sb(V) was further enhanced through formation of surface ternary complexes. Adsorption kinetic experiments demonstrated that the pseudo-second-order rate model was suitable for assessing the removal of Cr(VI) by CGFO11. Furthermore, the removal of Cr(VI) using CGFO11 fitted well with the Freundlich isothernm adsorption model (R2 = 0.9807). The overall results demonstrated nano Fe(III) oxide is a promising amendment material in CO2-assisted pyrolysis of lignocellulosic biomass for enhancing syngas generation and producing functional biochar.

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