Experimental constraints on the formation of oxychlorine species by UV irradiation and mechanical pulverization on the lunar surfaceOAEI
Perchlorate and chlorate are present in various extraterrestrial celestial bodies throughout the solar system,such as Mars,the moon,and asteroids.To date,the origin mechanisms of perchlorate and chlorate on the Martian surface have been well-established;however,relatively little attention has been cast to airless bodies.Here,we experimentally investigated the potential oxidation mechanisms of chloride to chlorate and perchlorate,such as ultraviolet irradiation under H_(2)O-and O_(2)-free conditions and mechanical pulverization processes.Individual minerals,olivine,pyroxene,ilmenite,magnetite,TiO_(2)and anhydrous ferric sulfate,and lunar regolith simulants(low Ti,CLRS-1;high-Ti,CLRS-2)and their metallic iron(Fe^( 0))bearing counterparts were examined.We found that pulverization of dry matrix material-halite mixtures,even in the presence of O_(2),does not necessarily lead to perchlorate and chlorate formation without involving water.Under photocatalytic and H_(2)O and O_(2)-free conditions,olivine and pyroxene can produce oxychlorine(ClO_(x)^(−))species,although the yields were orders of magnitude lower than those under Martian-relevant conditions.Nanophase-Fe^(0)particles in the lunar regolith and the common photocatalyst TiO_(2)can facilitate the ClO_(x)^(−)formation,but their yields were lower than those with olivine.The oxides ilmenite and magnetite did not efficiently contribute to ClO_(x)^(−)production.Our results highlight the critical role of H_(2)O in the oxidation chloride to chlorate and perchlorate,and provide essential insights into the environmental influence on the formation of oxychlorine species on different celestial bodies.
Jiamei Li;Yu-Yan Sara Zhao;He Cui;Shuai-Yi Qu;Yanhua Peng;Yuhong Yang;Xiongyao Li;
Research Center for Planetary Science,College of Earth and Planetary Sciences,Chengdu University of Technology,Chengdu 610059,ChinaResearch Center for Planetary Science,College of Earth and Planetary Sciences,Chengdu University of Technology,Chengdu 610059,China Center for Excellence in Comparative Planetology,Chinese Academy of Sciences,Hefei 230026,ChinaCollege of Life Sciences,Wuchang University of Technology,Wuhan 430204,China Technical Center of Qingdao Customs,Qingdao 266114,ChinaInstitute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China University of Chinese Academy of Sciences,Beijing 100049,ChinaNanning College of Technology,Guilin 541006,ChinaCenter for Lunar and Planetary Sciences,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,ChinaCenter for Excellence in Comparative Planetology,Chinese Academy of Sciences,Hefei 230026,China Center for Lunar and Planetary Sciences,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China
天文学
PerchlorateChlorateLunar regolithMetallic FeAirless bodies
《Acta Geochimica》 2024 (004)
P.625-637 / 13
supported by the B-type Strategic Priority Program of the Chinese Academy of Sciences(XDB41000000);the National Natural Science Foundation of China(42373042);the National Key Scientifi c Instrument and Equipment Development Project(2012YQ090229);the Scientifi c Instrument Upgrading Project of Shandong Province(2012SGGZ18);the Key Research Program of the Chinese Academy of Sciences(ZDBS-SSWTLC001);the Program of the Institute of Geology&Geophysics CAS(IGGCAS-201905).
评论