新型捕收剂烷基多胺醚与碧玉和磁铁矿的吸附机理

来源期刊:中南大学学报(自然科学版)2014年第5期

论文作者:葛英勇 黄龙 熊学恒 余永富

文章页码:1377 - 1384

关键词:阳离子捕收剂;碧玉;磁铁矿;吸附机理

Key words:cationic collector; jasper; magnetite; adsorption mechanism

摘    要:通过分光光度法得出烷基多胺醚在碧玉和磁铁矿表面的吸附等温线。研究结果表明:当温度升高时,碧玉和磁铁矿对烷基多胺醚的吸附量下降;在同等温度下,烷基多胺醚在碧玉表面比在磁铁矿表面的吸附量大。进一步计算出碧玉吸附烷基多胺醚的吸附焓为ΔH=-11.04 kJ/mol,介于物理吸附焓和化学吸附焓之间;磁铁矿吸附烷基多胺醚的吸附焓ΔH=-6.76 kJ/mol,为物理吸附;碧玉的吸附焓较大,说明烷基多胺醚对碧玉有更强的捕收作用。烷基多胺醚阳离子的键合原子静电荷比十二胺阳离子更多,更易于与矿物表面发生键合作用;烷基多胺醚阳离子的最高占据轨道与最低空轨道能量差(Δε)比十二胺阳离子的小,其反应活性更高,捕收能力更强。

Abstract: The adsorption isotherm of alkyl polyamine ether (GE) on jasper and magnetite was obtained by the spectrophotometry. The results show that the adsorption capacity of GE on jasper and magnetite decreases as the temperature increases. And the adsorption capacity of GE on jasper is larger than that on magnetite at the same temperature. The adsorption enthalpy(ΔH) of GE on jasper is -11.04 kJ/mol, which is between that of physical adsorption and chemical adsorption. The ΔH of GE on magnetite is -6.76 kJ/mol, belonging to physical adsorption. As ΔH of GE on jasper is larger than that on magnetite, GE has a stronger collecting action on jasper. GE cationic has more electrostatic charges of bonding atoms than twelve amine cationic, and it is easier to bond with mineral surface; With smaller HOMO-LUMO GAP(Δε) than twelve amine cationic, GE cationic has higher reactivity and stronger collecting ability.

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