干旱区生态环境知识资源中心(Arid): The Micro-Scaled Characterization of Natural Terrestrial Ferromanganese Coatings and Their Semiconducting Properties

Arid

DOI	10.3390/coatings10070666
	The Micro-Scaled Characterization of Natural Terrestrial Ferromanganese Coatings and Their Semiconducting Properties
	Xu, Xiaoming; Ding, Hongrui; Li, Yan; Wang, Haoran; Lu, Anhuai
通讯作者	Lu, AH
来源期刊	COATINGS
EISSN	2079-6412
出版年	2020
卷号	10 期号:7
英文摘要	Different types of ferromanganese coatings were collected from the Chinese mainland to study their mineralogical characteristics and semiconducting properties. Measurements, including by optical microscope, scanning electron microscope, energy dispersive X-ray spectroscopy, micro-Raman spectrometer and transmission electron microscope, were employed to study their morphology, mineral assemblage, element abundance and distribution patterns. Soil Fe coatings are mainly composed of Al-rich hematite and clays. Soil Fe/Mn coatings can be divided into an outer belt rich in birnessite and an inner belt rich in hematite, goethite, ilmenite and magnetite. Goethite is the only component of rock Fe coatings. Rock Fe/Mn coatings mainly consist of birnessite and hematite, and alternating Fe/Mn-rich layers and Fe/Mn-poor layers can be observed. Powders were scraped off from the topmost part of ferromanganese coatings to conduct laboratory photochemical experiments. The photocurrent-time behavior indicates that natural coating electrodes exhibit an immediate increase in photocurrent intensity when exposed to light irradiation. Natural coatings can photo-catalytically degrade 14.3%-58.4% of methyl orange in 10 h. Under light irradiation, the photocurrent enhancement and organic degradation efficiency of the rock Fe/Mn coating, which has a close intergrowth structure of Fe and Mn components, is most significant. This phenomenon is attributed to the formation of semiconductor heterojunctions, which can promote the separation of electrons and holes. Terrestrial ferromanganese coatings are common in natural settings and rich in semiconducting Fe/Mn oxide minerals. Under solar light irradiation, these coatings can catalyze important photochemical processes and will thus have an impact on the surrounding environment.
英文关键词	ferromanganese coatings semiconducting minerals photocatalysis methyl orange
类型	Article
语种	英语
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000554313600001
WOS关键词	MANGANESE-OXIDE ; DESERT VARNISH ; CATALYTIC-OXIDATION ; ELECTRONIC-STRUCTURES ; IRON ; FE ; DEGRADATION ; MINERALOGY ; FILMS ; BIRNESSITES
WOS类目	Materials Science, Multidisciplinary ; Materials Science, Coatings & Films ; Physics, Applied
WOS研究方向	Materials Science ; Physics
来源机构	北京大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/325320
作者单位	[Xu, Xiaoming; Ding, Hongrui; Li, Yan; Wang, Haoran; Lu, Anhuai] Peking Univ, Sch Earth & Space Sci, Beijing Key Lab Mineral Environm Funct, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Xu, Xiaoming,Ding, Hongrui,Li, Yan,et al. The Micro-Scaled Characterization of Natural Terrestrial Ferromanganese Coatings and Their Semiconducting Properties[J]. 北京大学,2020,10(7).
APA	Xu, Xiaoming,Ding, Hongrui,Li, Yan,Wang, Haoran,&Lu, Anhuai.(2020).The Micro-Scaled Characterization of Natural Terrestrial Ferromanganese Coatings and Their Semiconducting Properties.COATINGS,10(7).
MLA	Xu, Xiaoming,et al."The Micro-Scaled Characterization of Natural Terrestrial Ferromanganese Coatings and Their Semiconducting Properties".COATINGS 10.7(2020).