Environmental effects of micro- and ultra-microchannel structures of   natural minerals

CORC > 北京大学 > 地球与空间科学学院

	Environmental effects of micro- and ultra-microchannel structures of natural minerals
	Lu, Anhuai ; Huang, Shanshan ; Liu, Rui ; Zhao, Dongjun ; Qin, Shan
刊名	acta geologica sinica english edition
	2006
关键词	environmental mineralogy cryptomelane feldspar ultra-microchannel effect ionic sieves ION-EXCHANGE ALKALI FELDSPARS MANGANIC ACID CRYPTOMELANE LEAD SORPTION RADIONUCLIDES DISSOLUTION HOLLANDITE CADMIUM
英文摘要	The micro-channels usually refers to structural channels of minerals with aperture in the range of 0.3 nm to 2.0 nm. Such microchannels include, Mn-O octahedron channel filled by K in cryptomelane, and channel constructed by Si-O and Al-O tetragonal molecular sieve filled by Na and Ca in zeolite, and effectively have the function of molecular sieve. Here we point out that ultra-microchannels of natural minerals have apertures below 0.3 nm with the features of ionic sieves. The ultra-microchannels of mineral feldspar, accounting for half mass of the Earth's crust, have been largely ignored because the aperture is too small. In this work, we present that feldspar displays a certain degree of ion exchange and owns a feature of channel structure under both high and low temperatures. At high temperature, Na+ can enter the channels of feldspars. The content of Na2O in feldspar increases up to 15.9%. At middle temperature, Pb2+ can also enter the channels of feldspar as the result of ion exchange, leading thus to the formation of Pb-feldspar. At room temperature, about 97.94% Cd2+ can be removed and Cd-feldspar can be obtained. These phenomena indicate typical effects of ultra-microchannels of feldspar, which may be suggested as a potential for the treatment of heavy metal pollution and nuclear waste. The ultra-microchannels of natural minerals have played special role in migration and exchange of geomaterials. The molecular sieves of microchannels of a few natural minerals have the property of purifying molecular gas pollution. And the ionic sieves of ultra-microchannels of most natural minerals can purify ionic water contaminates.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000237430400001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Geosciences, Multidisciplinary; SCI(E); 0; ARTICLE; 2; 161-169; 80
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/311371]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Lu, Anhuai,Huang, Shanshan,Liu, Rui,et al. Environmental effects of micro- and ultra-microchannel structures of natural minerals[J]. acta geologica sinica english edition,2006.
APA	Lu, Anhuai,Huang, Shanshan,Liu, Rui,Zhao, Dongjun,&Qin, Shan.(2006).Environmental effects of micro- and ultra-microchannel structures of natural minerals.acta geologica sinica english edition.
MLA	Lu, Anhuai,et al."Environmental effects of micro- and ultra-microchannel structures of natural minerals".acta geologica sinica english edition (2006).