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以钙基蒙脱石(Ca-MMT)和五水硝酸铋为原料,探讨硝酸溶液与硝酸铋溶液处理过蒙脱石的形貌和结构的变化情况,同时,研究蒙脱石吸附强酸溶液中铋离子的特性,结果表明:蒙脱石在强酸溶液中能以Langmuir单分子层吸附方式吸附溶液中的铋离子,其中等温吸附铋离子的最大量为220.9×10-3;硝酸溶液中的氢离子能对蒙脱石中的Al-O八面体结构起到破坏作用;铋离子能对蒙脱石的层间水产生影响,同时一定程度上抑制氢离子对蒙脱石结构的破坏;硝酸与硝酸铋溶液处理的蒙脱石(001)晶面间距都减小,但硝酸铋溶液处理的蒙脱石(001)晶面间距减小更为显著;吸附了铋离子的蒙脱石(001)晶面间距,随溶液中铋离子初始浓度的增大而增大。
With the Ca-MMT and bismuth nitrate pentahydrate as raw materials, the morphologies and structures of the montmorillonite treated with nitric acid solution and bismuth nitrate solution were investigated. Meanwhile, the adsorption of montmorillonite in strong acid solution The results showed that montmorillonite can adsorb bismuth ion in the solution with strong Langmuir monolayer in strong acid solution, the maximum amount of bismuth ion adsorbed by the isothermal solution is 220.9 × 10-3. The hydrogen in the nitric acid solution Ion can damage the Al-O octahedral structure in montmorillonite. Bismuth ions can affect the interlayer water of montmorillonite and inhibit the hydrogen ion to some extent from the destruction of montmorillonite. Nitric acid and However, the spacing of the (001) plane of montmorillonite treated with bismuth nitrate solution decreased more obviously. The adsorption of montmorillonite (001) Interplanar spacing, with the initial concentration of bismuth ions in the solution increases.