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机构地区:[1]武汉理工大学资源与环境工程学院,湖北武汉430070
出 处:《金属矿山》2016年第7期132-135,共4页Metal Mine
摘 要:白云母因片层上发生离子取代而呈现强电负性,对层间离子具有很强的静电吸引力,致其离子交换能很小,这严重阻碍白云母的剥离及其二维纳米材料的制备。为此,研究了不同处理方法对白云母离子交换能的影响。结果表明:白云母在750℃下煅烧后因发生脱羟基作用,使离子交换能增加0.11 mmol/g;750℃煅烧后经Na B(C_6H_5)_4处理,其离子交换能仅小幅增大;750℃煅烧后经Li NO_3处理,离子交换能显著提高至0.65 mmol/g。样品的XRD和IR分析表明,煅烧以及煅烧后经Li NO_3处理均可显著增大白云母的层间距,降低层对层间离子的吸引力,提高离子交换能。因此,煅烧和煅烧后用Li NO_3处理,是制备高附加值白云母的重要方法。Muscovite has strong negative charge due to the ion substitution,which lead to their interlayer ions have strong electrostatic attraction,and small cation exchange capacity( CEC). As a result,it is difficult for the exfoliation of muscovite and the preparation into two dimensional nanomaterial. Effect of various treating methods on the CEC of muscovite was studied. The experiment results showed that CEC increase of 0. 11 mmol/g was obtained on muscovite after calcination at 750 ℃ due to the dehydroxylation. However the value of CEC only had a little increase when muscovite was treated with Na B( C6H5)4after calcination at 750 ℃. A dramatical increase of CEC to 0. 65 mmol/g was found when treated with Li NO3 after calcination at 750℃. The XRD and IR analysis of muscovite showed that the increase of the basic spacing and weakening of the attraction force from layers to interlayer ions could be achieved when calcination and Li NO3 treatment applied. Calcination and Li NO3 treatment are an important methods for the preparation of high value-added muscovite.
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