氯化铁-硫酸钠体系中合成的施威特曼石的稳定性  

Stability of Schwertmannite Synthesized in Ferric Chloride–Sodium Sulphate System

作　　者：刘欢[1] 陆现彩[1] 欧阳冰洁[1] 李娟[1] 陆建军[1] 

机构地区：[1]内生金属矿床成矿机制研究国家重点实验室,南京大学地球科学与工程学院,南京210093

出　　处：《硅酸盐学报》2013年第5期663-668,共6页Journal of The Chinese Ceramic Society

基　　金：国家重点基础研究发展计划(2007CB815603);国家自然科学基金(40930742,10979018)资助

摘　　要：施威特曼石是表生环境中常见的微纳米矿物,有着重要的环境指示作用和修复重金属污染的应用潜力。对在FeCl3 6H2O和Na2SO4合成体系中生成的施威特曼石经透析和老化处理后的产物进行了矿物学表征,结果表明:透析后的施威特曼石呈现出更为清晰的X射线衍射结构峰,并对其微观形貌有一定的影响,比表面积增大;未经透析的施威特曼石沉淀经老化后会逐步转化为黄钠铁矿,Fourier变换红外光谱中出现1010和1025cm–1附近的归属于OH弯曲振动的双峰,且因Na+进入晶格,SO42–的伸缩振动峰值发生偏移。Schwertmannite is a common micro-nano-sized mineral in the supergene environment. This mineral as an important environmental indicator has a potential remediation of heavy metal contamination. Some products from treating with dialyzing and ageing process of schwertmannite synthesized from the system of FeCl3？6H2O and Na2SO4 were analyzed. The results reveal that dialyzing improves the structural stability, and has a positive effect on the micro-morphology. The specific surface area increased during the dialyzing process. In the ageing process, schwertmannite was transformed to natrojarosite progressively. In the Fourier transform infrared spectra, two peaks at 1 010 and 1 025 cm^–1 appeared due to the vibration of δ（OH）, and Na＋ was captured into the crystal lattice, resulting in a little drift of ν3 （SO4^2–）.

关 键 词：氯化铁–硫酸钠体系 施威特曼石 透析 老化 稳定性 

分 类 号：TQ170.9[化学工程—硅酸盐工业]