Competitive and non-competitive batch experiments were conducted on flax fibers to study Zn²⁺, Cu²⁺, and Pb²⁺ ions biosorption performance. Biosorption efficiency was dependent on contact time, pH, and biosorbent concentration. The results under competitive conditions were different from those obtained in non-competitive form. A high affinity of lead, with a selectivity sequence in general of Pb > Cu > Zn was observed. The biosorption data fitted very well the Langmuir model for lead in both types of solutions and for zinc and copper in the monometal form. The fit with the Freundlich model was not as successful, except for copper in the ternary system. Regarding zinc under competitive conditions, the sorption process was quite difficult and thus the equilibrium data could not fit well the adsorption models. The maximum adsorption capacities (mmol.kg⁻¹) were respectively 112, 122 and 71, for Pb, Cu and Zn in the single metal ion solution and 82, 57 and 8 only in the ternary, showing thus a high competition between metal ions when added simultaneously. Overall, lead could still be efficiently removed in spite of the presence of other ions while zinc would be overcome in the presence of lead and copper.

在亚麻纤维上进行竞争性和非竞争性批处理实验，以研究Zn 2 ⁺，Cu ²⁺和Pb ²⁺离子的生物吸附性能。生物吸附效率取决于接触时间，pH和生物吸附剂浓度。竞争条件下的结果与非竞争形式下的结果不同。观察到铅的亲和力高，选择性顺序一般为Pb> Cu> Zn。两种溶液中的铅以及单金属形式的锌和铜的生物吸附数据都非常适合Langmuir模型。Freundlich模型的拟合不那么成功，除了三元系统中的铜。对于竞争条件下的锌，吸附过程非常困难，因此平衡数据不能很好地拟合吸附模型。最大吸附量（mmol.kg ^-1）在单一金属离子溶液中的Pb，Cu和Zn分别为112、122和71，而在三元溶液中的分别为82、57和8，因此，当同时添加时，金属离子之间的竞争非常激烈。总体而言，尽管存在其他离子，仍然可以有效地除去铅，而在铅和铜的存在下可以克服锌。