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选择针铁矿作为典型矿物的代表,通过酸碱滴定实验和ζ电位测定实验,确定吸附剂表面吸附点位的密度、酸度及荷电状态;开展间歇吸附实验考察不同pH下5种重金属离子在其表面上的吸附行为;采用改良型金属分配模型(MMP)对5种重金属离子在针铁矿表面的吸附行为进行模拟。结果表明,针铁矿对重金属离子的吸附量随pH升高而升高,在一个较窄的pH范围内吸附率急剧升高,呈S形分布;不同的重金属离子开始吸附的pH和达到最高吸附量的pH不尽相同。MMP模型模拟效果较好,相关系数的平方均在0.94以上。从所得吸附常数可判断重金属在针铁矿上的吸附顺序为Cu2+>Zn2+>Cd2+>Co2+>Ni2+。
Select goethite as a representative of typical minerals, acid-base titration experiments and ζ potential determination experiments to determine the adsorbent surface adsorption point density, acidity and state of charge; to carry out intermittent adsorption experiments at different pH under five kinds of heavy metal ions in The adsorption behavior of the five heavy metal ions on the surface of goethite was simulated by a modified metal partitioning model (MMP). The results showed that the amount of heavy metal ions adsorbed by goethite increased with the increase of pH, and the adsorption rate increased sharply in a narrow pH range with an S-shaped distribution. The adsorption pH of different heavy metal ions reached the highest The amount of adsorption pH varies. The simulation results of MMP model are good, and the square of the correlation coefficient is above 0.94. From the obtained adsorption constants, the order of adsorption of heavy metals on goethites is Cu2 +> Zn2 +> Cd2 +> Co2 +> Ni2 +.