Manganese Oxide Minerals from the Xiangtan Manganese Deposit in South China and Their Application in Formaldehyde Removal
Because of the nano-scale tunnel constructed by the active Mn-O octahedron in cryptomelane, cryptomelane-type manganese oxides have high activity in the oxidation of several volatile organic compounds (VOCs). Natural cryptomelane, in the form of supergene oxide manganese ore, carpets much of South C...
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MDPI AG
2022-04-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/12/5/552 |
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| author | Liqun Zhao Sida Niu Xianglong Niu Tong Chen Yingchao Wang Lei Li Fei Huang Huaying Wu Lingchao Mo Min Zhang |
| author_facet | Liqun Zhao Sida Niu Xianglong Niu Tong Chen Yingchao Wang Lei Li Fei Huang Huaying Wu Lingchao Mo Min Zhang |
| author_sort | Liqun Zhao |
| collection | DOAJ |
| description | Because of the nano-scale tunnel constructed by the active Mn-O octahedron in cryptomelane, cryptomelane-type manganese oxides have high activity in the oxidation of several volatile organic compounds (VOCs). Natural cryptomelane, in the form of supergene oxide manganese ore, carpets much of South China. In the lower part of the Datangpo Formation of Nanhua System on the southeastern Yangtze Platform, cryptomelane is one of the major manganese oxides in black shale of the Xiangtan manganese deposit in this deposit. Formaldehyde is a dominant indoor pollutant among volatile organic compounds (VOCs), and applications of synthetic cryptomelane have been reported to eliminate it. To study the removal capacity of naturally outcropping cryptomelane, representative samples of manganese oxide (the primary mineral component of cryptomelane) from the Xiangtan Mn deposit were analyzed in this study. The chemical composition, crystal structure and micromorphology of the manganese oxide minerals were explored using ICP-AES, XRD, EPMA, SEM and HR-TEM techniques. Fine-grained and poorly crystalline, these minerals consist primarily of cryptomelane, along with minor amounts of pyrolusite, hollandite, lithiophorite, limonite and quartz. Natural cryptomelane is a monoclinic crystal, and its cell parameters are refined. The results of catalytic tests revealed that natural cryptomelane has obvious catalytic activity in the oxidation of formaldehyde in a static environment under room temperature. This study may provide a natural mineral material as an inexpensive and efficient catalyst for the purification of formaldehyde in industrial or indoor air treatment. |
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| language | English |
| last_indexed | 2024-03-10T03:21:59Z |
| publishDate | 2022-04-01 |
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| series | Minerals |
| spelling | doaj.art-503595199cfd4e4195e49ac8472fe1b92023-11-23T12:18:23ZengMDPI AGMinerals2075-163X2022-04-0112555210.3390/min12050552Manganese Oxide Minerals from the Xiangtan Manganese Deposit in South China and Their Application in Formaldehyde RemovalLiqun Zhao0Sida Niu1Xianglong Niu2Tong Chen3Yingchao Wang4Lei Li5Fei Huang6Huaying Wu7Lingchao Mo8Min Zhang9Institute of Mineral Resources Research, China Metallurgical Geology Bureau, Beijing 101300, ChinaInstitute of Mineral Resources Research, China Metallurgical Geology Bureau, Beijing 101300, ChinaInstitute of Mineral Resources Research, China Metallurgical Geology Bureau, Beijing 101300, ChinaInstitute of Mineral Resources Research, China Metallurgical Geology Bureau, Beijing 101300, ChinaInstitute of Mineral Resources Research, China Metallurgical Geology Bureau, Beijing 101300, ChinaBGRIMM Technology Group, Beijing 102628, ChinaHunan Geological Exploration Institute of China Metallurgical Geology Bureau, Changsha 410001, ChinaInstitute of Mineral Resources Research, China Metallurgical Geology Bureau, Beijing 101300, ChinaInstitute of Mineral Resources Research, China Metallurgical Geology Bureau, Beijing 101300, ChinaInstitute of Mineral Resources Research, China Metallurgical Geology Bureau, Beijing 101300, ChinaBecause of the nano-scale tunnel constructed by the active Mn-O octahedron in cryptomelane, cryptomelane-type manganese oxides have high activity in the oxidation of several volatile organic compounds (VOCs). Natural cryptomelane, in the form of supergene oxide manganese ore, carpets much of South China. In the lower part of the Datangpo Formation of Nanhua System on the southeastern Yangtze Platform, cryptomelane is one of the major manganese oxides in black shale of the Xiangtan manganese deposit in this deposit. Formaldehyde is a dominant indoor pollutant among volatile organic compounds (VOCs), and applications of synthetic cryptomelane have been reported to eliminate it. To study the removal capacity of naturally outcropping cryptomelane, representative samples of manganese oxide (the primary mineral component of cryptomelane) from the Xiangtan Mn deposit were analyzed in this study. The chemical composition, crystal structure and micromorphology of the manganese oxide minerals were explored using ICP-AES, XRD, EPMA, SEM and HR-TEM techniques. Fine-grained and poorly crystalline, these minerals consist primarily of cryptomelane, along with minor amounts of pyrolusite, hollandite, lithiophorite, limonite and quartz. Natural cryptomelane is a monoclinic crystal, and its cell parameters are refined. The results of catalytic tests revealed that natural cryptomelane has obvious catalytic activity in the oxidation of formaldehyde in a static environment under room temperature. This study may provide a natural mineral material as an inexpensive and efficient catalyst for the purification of formaldehyde in industrial or indoor air treatment.https://www.mdpi.com/2075-163X/12/5/552natural cryptomelanemanganese oxide mineralscatalytic oxidationformaldehydeXiangtan manganese deposit2 × 2 tunnel structure |
| spellingShingle | Liqun Zhao Sida Niu Xianglong Niu Tong Chen Yingchao Wang Lei Li Fei Huang Huaying Wu Lingchao Mo Min Zhang Manganese Oxide Minerals from the Xiangtan Manganese Deposit in South China and Their Application in Formaldehyde Removal Minerals natural cryptomelane manganese oxide minerals catalytic oxidation formaldehyde Xiangtan manganese deposit 2 × 2 tunnel structure |
| title | Manganese Oxide Minerals from the Xiangtan Manganese Deposit in South China and Their Application in Formaldehyde Removal |
| title_full | Manganese Oxide Minerals from the Xiangtan Manganese Deposit in South China and Their Application in Formaldehyde Removal |
| title_fullStr | Manganese Oxide Minerals from the Xiangtan Manganese Deposit in South China and Their Application in Formaldehyde Removal |
| title_full_unstemmed | Manganese Oxide Minerals from the Xiangtan Manganese Deposit in South China and Their Application in Formaldehyde Removal |
| title_short | Manganese Oxide Minerals from the Xiangtan Manganese Deposit in South China and Their Application in Formaldehyde Removal |
| title_sort | manganese oxide minerals from the xiangtan manganese deposit in south china and their application in formaldehyde removal |
| topic | natural cryptomelane manganese oxide minerals catalytic oxidation formaldehyde Xiangtan manganese deposit 2 × 2 tunnel structure |
| url | https://www.mdpi.com/2075-163X/12/5/552 |
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