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用表面被疏水性季铵薄膜改性的针铁矿从碱性溶液(pH11.3)中提取了高铼酸根阴离子ReO_4~-。通过带负电荷的无机物表面和带正电荷的季铵基团之间的缔合作用,使季铵化合物结合到针铁矿表面上。而且,由于残留有游离季铵基团的吸附层的疏水作用,导致针铁矿表面聚集了更多的游离李铵基团。这些季铵基团可以从硝酸根或氢氧根等不能极化的阴离子中选择性提取能极化的高铼酸根阴离子,而且提取动力学速度很快(t1/2<5min)。各种改性针铁矿提取高铼酸根的容量为10—600mmol/kg。发现了一种新的阴离子-阴离子反应类型。当NO-3~-/ReO_Y~-摩尔比低于12:1 时,铼以简单阴离子ReO_4~-形式被提取;高于12:1时,主要提取的可能是三元阴离子(NO_3MReO_4)~-,其中M为一价金属离子,如Na~+。
The perrhenate anion ReO_4 ~ - was extracted from alkaline solution (pH11.3) with goethite modified by hydrophobic quaternary ammonium membrane. The quaternary ammonium compound is bonded to the goethite surface by the association between the negatively charged inorganic surface and the positively charged quaternary ammonium groups. Moreover, due to the hydrophobic effect of the adsorbed layer with free quaternary ammonium groups remaining, more free ammonium groups are accumulated on the goethite surface. These quaternary ammonium groups can selectively polarize perrhenate anions from unpolarized anions such as nitrate or hydroxide and have very fast extraction kinetics (t1 / 2 <5 min). Various modified goethite extract perrhenate capacity of 10-600mmol / kg. A new anion-anion reaction type was found. When the molar ratio of NO 3 - / ReO_Y - is lower than 12: 1, rhenium is extracted as simple anion ReO 4 -. Above 12: 1, the main extraction may be ternary anions (NO 3 MReO 4) , Where M is a monovalent metal ion, such as Na ~ +.