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엄한샘(Han-Saem Eom),홍부표(Boo-Pyo Hong),최동원(Dong-won Choi),최휘웅(Hwi-Woong Choi),윤정인(Jung-In Yoon),최광환(Kwang-Hwan Choi) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.11
It is essential to know the climatic characteristics of the site for energy efficient building design. However, it is difficult to obtain a climate data through the new energy system device. Even if the new data is obtained, it is difficult to be applied to the building. Because it is usually consisted of just series of efficiency. In the meaning, a solar air heating has low efficiency compared with the solar water heating because of the smaller thermal capacity. The heat received by solar air-water combined system plate is not fully transferred to the air and then a part of them became the losses to the environment through conduction and convection process. This research is focusing on the investigation of efficiency of better combined multi-purposed system suggested by us and aims to secure the more effective solar energy utilization by combining the hot water and air heating system.
폐 알칼리망간전지의 산 침출액으로부터 버네사이트(δ-MnO₂)의 제조 및 1-naphthol 제거
엄원숙(Won-Suk Eom),이한샘(Han-Saem Lee),이동석(Dong-Seok Rhee),신현상(Hyun-Sang Shin) 대한환경공학회 2016 대한환경공학회지 Vol.38 No.11
본 연구에서는 폐 알칼리망간전지 분말(spent alkaline manganese battery powder, SABP <8 mesh)의 산 침출액으로부터 분리한 망간이온을 이용하여 산화-중합반응 촉매인 버네사이트를 제조하였고, 1-naphthol (1-NP)을 대상으로 페놀계 화합물의 제거 반응성을 조사하였다. 망간산화물의 결정상과 반응성은 순수 망간시약(MnSO₄, MnCl₂)을 사용하여 합성한 망간산화물(manganese oxide, MOs) 및 기존의 McKenzie 합성방법에 의한 Acid birnessite (A-Bir)의 결과와도 비교 평가하였다. SABP에 존재하는 망간과 아연이온은 과산화수소 존재 하에서의 황산 침출(1.0 M H₂SO₄ + 10.5% H₂O₂, solid/liquid (S/L)비=1/10g/mL, 60℃)을 통해 각각 약 96%와 98% 회수하였다. 산 침출액으로부터 망간이온은 수산화물(NaOH) 침전을 통해 pH 8과 pH>13 조건에서 각각 69.0%와 94.3% 분리하였다. 1-NP 제거능을 토대로 SABP 산 침출액으로부터 알칼리(NaOH) 수열합성법에 의한 망간산화물의 제조를 위한 적정 OH/Mn 혼합비(M/M)는 6.0이었고, XRD 분석을 통해 버네사이트(δ-MnO₂) 결정상을 가짐을 확인하였다. pH 8 (Mn<SUP>2+</SUP>(aq))과 pH>13 (Mn(OH)2(s))에서 회수한 망간을 사용하여 얻은 망간산화물의 1-NP 제거 반응속도(k, at pH 6)는 각각 0.112, 0106 min<SUP>-1</SUP>으로서 MnSO₄ 시약을 사용하여 얻은 망간산화물의 결과(0.117 min<SUP>-1</SUP>)와 유사하였다. 이상의 연구를 통해 폐 알칼리망간전지 분말로부터 얻은 버네사이트는 미량 유해물질 제거를 위한 산화-중합 반응 촉매로 활용 가능함을 알 수 있었으며, 버네사이트 제조를 위한 폐 알칼리망간전지의 재활용 흐름도를 제시하였다. This work studies the synthesis of birnessite (δ-MnO₂), a catalyst of oxidative-coupling reactions, from the powder of spent alkaline manganese batteries (SABP, <8 mesh) and evaluate its reactivity for 1-naphthol (1-NP) removals. Manganese oxides using commercial reagents (MnSO₄, MnCl₂) and the acid birnessite (A-Bir) by McKenzie method were also synthesized, and their crystallinity and reactivity for 1-NP were compared with one another. 96% Mn and 98% Zn were extracted from SABP by acid leaching at the condition of solid/liquid (S/L) ratio 1:10 in 1.0 M H2SO₄ + 10.5% H₂O₂ at 60℃. From the acid leaching solution, 69% (at pH 8) and 94.3% (pH>13) of Mn were separated by hydroxide precipitation. Optimal OH/Mn mixing ratio (㏖/㏖) for the manganese oxide (MO) synthesis by alkaline (NaOH) hydrothermal techniques was 6.0. Under this condition, the best 1-NP removal efficiency was observed and XRD analysis confirmed that the MOs are corresponding to birnessite. Kinetic constants (k, at pH 6) for the 1-NP removals of the birnessites obtained from Mn recovered at pH 8 (Mn<SUP>2+</SUP>(aq)) and pH>13 (Mn(OH)2(s)) are 0.112 and 0.106 min<SUP>-1</SUP>, respectively, which are similar to that from MnSO4 reagent (0.117 min<SUP>-1</SUP>). The results indicated that the birnessite prepared from the SABP as a raw material could be used as an oxidative-coupling catalyst for removals of trace phenolic compounds in soil and water, and propose the recycle scheme of SAB for the birnessite synthesis.