Influence of pH on Molecular Hydrogen (H-2) Generation and Reaction Rates during Serpentinization of Peridotite and Olivine

doi:10.3390/min9110661

CORC > 海洋研究所 > 中国科学院海洋研究所 > 深海极端环境与生命过程研究中心

	Influence of pH on Molecular Hydrogen (H-2) Generation and Reaction Rates during Serpentinization of Peridotite and Olivine
	Huang, Ruifang 2; Sun, Weidong 1,3,5; Song, Maoshuang 4; Ding, Xing 4
刊名	MINERALS
	2019-11-01
卷号	9 期号:11 页码:17
关键词	olivine serpentinization pyroxene minerals aluminum molecular hydrogen
DOI	10.3390/min9110661
通讯作者	Huang, Ruifang(huangrf@sustech.edu.cn) ; Sun, Weidong(weidongsun@gig.ac.cn)
英文摘要	Serpentinization produces molecular hydrogen (H-2) that is capable of supporting communities of microorganisms in hydrothermal fields, which suggests that serpentinization may be closely related to the origin of life at the early history of the Earth and possibly other planets. In this study, serpentinization experiments were performed at 300 degrees C and 3.0 kbar with natural olivine and peridotite as starting reactants to quantify the influence of acidic and alkaline solutions on the processes of serpentinization. The results reveal that acidic and alkaline solutions greatly influence molecular hydrogen (H-2) generation and the rates of serpentinization. Acidic (pH = 2.50) and alkaline solutions (pH = 13.5) increased H-2 production and the rates of peridotite serpentinization. Highly acidic solutions (2 M HCl), however, decreased the production of H-2 after peridotite serpentinization by around two orders of magnitude. The decrease in H-2 production was associated with a sharp decline in the rates of reaction; e.g., when peridotite was reacted with neutral solutions (0.5 M NaCl), 88% of reaction progress was achieved after an experimental duration of 27 days, and the reaction extent decreased by similar to 50% for experiments with highly acidic solutions (2 M HCl) over the same period. In contrast, for experiments with solely olivine, highly acidic solutions (2 M HCl) promoted the rates of olivine serpentinization and H-2 production. The contrasting effect of highly acidic solutions (2 M HCl) on the processes of olivine and peridotite serpentinization may reflect the influence of pyroxene minerals, which could release SiO2 during peridotite serpentinization and, consequently, hydrogen generation and reaction rates may decrease. The experimental results of this study suggest that H-2 production and the rates of serpentinization can be greatly influenced by acidic and alkaline solutions and co-existing minerals (e.g., pyroxene).
资助项目	Natural Science Foundation of China[41873069] ; National Key R&D Program of China[2016YFC0600408] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA22050103] ; Shenzhen Clean Energy Research Institute[CERI-KY-2019-003]
WOS研究方向	Mineralogy ; Mining & Mineral Processing
语种	英语
出版者	MDPI
WOS记录号	WOS:000502267100014
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/164100]
专题	海洋研究所_深海极端环境与生命过程研究中心
通讯作者	Huang, Ruifang; Sun, Weidong
作者单位	1.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Shandong, Peoples R China 2.Southern Univ Sci & Technol, SUSTech Acad Adv Interdisciplinary Studies, Shenzhen 518055, Guangdong, Peoples R China 3.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao 266071, Shandong, Peoples R China 4.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China 5.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Huang, Ruifang,Sun, Weidong,Song, Maoshuang,et al. Influence of pH on Molecular Hydrogen (H-2) Generation and Reaction Rates during Serpentinization of Peridotite and Olivine[J]. MINERALS,2019,9(11):17.
APA	Huang, Ruifang,Sun, Weidong,Song, Maoshuang,&Ding, Xing.(2019).Influence of pH on Molecular Hydrogen (H-2) Generation and Reaction Rates during Serpentinization of Peridotite and Olivine.MINERALS,9(11),17.
MLA	Huang, Ruifang,et al."Influence of pH on Molecular Hydrogen (H-2) Generation and Reaction Rates during Serpentinization of Peridotite and Olivine".MINERALS 9.11(2019):17.