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采用原位衰减全反射红外光谱技术(ATR-FTIR)探讨pH值和磷酸根浓度对磷酸根在磁铁矿表面吸附形态的影响。结果表明:随着pH值降低,磷酸根浓度增大,磷酸根在磁铁矿表面的吸附量随之增加,形成内层吸附。发现有3种吸附模型:(1)在低pH值时,主要形成对称性为C1的吸附形态,可能主要是单质子化双齿双核络合形态;(2)在高pH值条件下发现有2种形态,高磷酸根浓度条件下,形成1种对称性为C3ν吸附形态,主要是单齿单核络合形态,在低浓度条件下,发现1种C2ν对称性吸附形态,可能是去质子化双齿双核络合形态,与单齿单核络合形态的物种在低浓度条件下共同存在。
In situ attenuated total reflectance infrared spectroscopy (ATR-FTIR) was used to investigate the effect of pH and phosphate concentration on the morphology of phosphate adsorbed on magnetite. The results showed that with the decrease of pH, the concentration of phosphate increased and the amount of phosphate adsorbed on magnetite surface increased, forming the inner layer. Three adsorption models were found: (1) At low pH, predominantly symmetrical C1 adsorption patterns were observed, which may be dominated by single-protonated bidentate dinuclear complexes; (2) at high pH, Under the condition of 2 kinds of morphology and high phosphate concentration, one kind of symmetry was formed in the form of C3ν adsorption, which was mainly monomode mononuclear complexation. Under the condition of low concentration, one kind of C2ν symmetric adsorption morphology was found, which may be deprotonated The bidentate dinuclear complex forms with the monodentate mononuclear complex species present at low concentrations.