A Study on Preparation of Nano Iron Oxides-Based Metal Biochar Using Co-Pyrolysis in a CO2 Environment and Adsorption of Cr(VI)

Jeong-Yun Jang; Sun Joon Kim

doi:10.32390/ksmer.2022.59.2.127

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2022 Vol.59, Issue 2 Next Page

Research Paper

A Study on Preparation of Nano Iron Oxides-Based Metal Biochar Using Co-Pyrolysis in a CO₂ Environment and Adsorption of Cr(VI) 이산화탄소 환경 내 공동 열분해를 통한 나노 철 산화물 기반 금속 바이오차 제조 및 Cr(VI) 흡착 연구

30 April 2022. pp. 127-136

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Abstract

This study explored the effects of blending nano iron (III) oxides (NIO) with coffee grounds (CG) in a pyrolytic process under a CO₂ environment on the generation of syngas (H₂ and CO) and biochar properties regarding the removal of Cr(VI) from aqueous solutions. CG and NIO were physically mixed; CG was mass maintained at 1 g while NIO was added. Based on the mass ratio, the resulting solution was named NICG1(NIO/CG ratio=1:1). Compared with the generation amounts of syngas (0.37 mole% H₂ & 0.28 mole% CO) at 650°C from single pyrolysis of CG, co-pyrolysis with NIO-based additives resulted in increased production of syngas, with the measured concentrations of H₂ and CO reaching 0.99 mole% and 0.86 mole% at the same temperature, respectively. During the pH effect experiments, NICG1 demonstrated the highest removal efficiency under acidic conditions with pH = 2. Adsorption kinetic experiments demonstrated that the pseudo-second-order rate model was suitable for assessing the removal of Cr(VI) by NICG1. Furthermore, the removal of Cr(VI) using NICG1 fitted well with the Freundlich isothernm adsorption model (R²= 0.9807). In conclusion, co-pyrolysis of blending nano iron(III) oxide and coffee grounds can be considered an efficient resource for simultaneously producing syngas (H₂ and CO) as a fuel (energy resource) and metal-biochar as an adsorbent.

Keywords

Coffee grounds

nano iron oxides

co-pyrolysis

syngas

Cr(VI)

본 연구는 이산화탄소 환경에서 금속 나노 철 산화물(NIO)과 커피찌꺼기(CG)의 혼합 열분해 공정에 대한 합성 가스(H₂ & CO) 생성에 미치는 영향 및 제조된 금속 바이오차(NICG1)의 수용액 내 6가 크롬 제거에 대해 조사하였다. 650°C에서 CG의 단독 열분해는 0.37 mole% H₂와 0.28 mole% CO의 합성 가스 생성을 보였고, NIO를 첨가한 공동 열분해를 통해 합성 가스의 생성량이 증가하였으며, NICG1의 동일한 온도에서 측정된 H₂ 및 CO 농도는 0.99, 0.86 mole%였다. 흡착 실험 결과, NICG1은 pH 2의 산성조건에서 가장 높은 제거 효율을 보였으며 유사 2차 속도 모델에 의한 6가 크롬 제거에 적합하다는 것을 보여주었다. 또한 NICG1을 사용한 6가 크롬 제거는 Freundlich Isothernm 흡착 모델(R²=0.9807)에 더 적합하였다. 결론적으로 폐자원인 커피찌꺼기와 나노 철 산화물의 co-pyrolysis를 통해 연료자원인 합성 가스(H₂와 CO)와 흡착제인 금속 바이오차를 동시에 생성할 수 있어 커피찌거기의 활용에 대한 높은 평가를 받을 수 있다.

키워드

커피찌꺼기

나노 철 산화물

공동 열분해

합성 가스

6가 크롬

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Information

Publisher :The Korean Society of Mineral and Energy Resources Engineers
Publisher(Ko) :한국자원공학회
Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
Journal Title(Ko) :한국자원공학회지
Volume : 59
No :2
Pages :127-136
Received Date : 2022-04-05
Revised Date : 2022-04-21
Accepted Date : 2022-04-26
DOI :https://doi.org/10.32390/ksmer.2022.59.2.127

Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

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