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폐 알칼리망간전지의 산 침출액으로부터 버네사이트(δ-MnO2)의 제조 및 1-naphthol 제거 |
엄원숙1, 이한샘1, 이동석2, 신현상1 |
1서울과학기술대학교 환경공학과 2강원대학교 환경공학과 |
Preparation of Birnessite (δ-MnO2) from Acid Leaching Solution of Spent Alkaline Manganese Batteries and Removals of 1-naphthol |
Won-Suk Eom1, Han-Saem Lee1, Dong-Seok Rhee2, Hyun-Sang Shin1 |
1Department of Environmental Engineering, Seoul National University of Sience and Technology 2Department of Environmental Engineering, Kangwon National University |
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Received: October 12, 2016; Revised: November 10, 2016; Accepted: November 18, 2016. Published online: November 30, 2016. |
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ABSTRACT |
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 (mol/mol) 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 (Mn2+(aq)) and pH>13 (Mn(OH)2(s)) are 0.112 and 0.106 min-1, respectively, which are similar to that from MnSO4 reagent (0.117 min-1). 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. |
Key Words:
Spent Alkaline Battery, Acid Leaching, Mn Separation, Birnessite, Oxidative-Transformation |
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