Study on removal potential of Cu, Ni, Pb and Zn from four plants under hydroponic conditions

Four plants were selected for formal experiments: Iris sibirica L., Hydrocotyle vulgaris L., Alternanthera philoxeroides (Mart.) Griseb. and Sedum aizoon L. The tolerance, enrichment and migration ability of these four plants for copper, nickel, lead and zinc were investigated. S. aizoon and H. vulgaris were Cu hyperaccumulators, and all the plants were Ni hyperaccumulators. When the copper concentration was 200 mg/L, I. sibirica had the highest removal rate for copper in water (91.44%). The A. philoxeroides removal rate remained above 69% at each Ni concentration, which was much greater than that of the other plants. When the lead concentration was 200 mg/L, S. aizoon had the highest removal rate for lead in water (98.84%). The H. vulgaris and S. aizoon removal rates were stable at the four Zn concentrations, all above 89%. Therefore, these plants can be used in appropriate situations to design ecofriendly restoration of wastewater containing harmful heavy metals.

在本次正式实验中，选取了四种植物：西伯利亚鸢尾（Iris sibirica L.）、普通水盾（Hydrocotyle vulgaris L.）、 Alternanthera philoxeroides (Mart.) Griseb. 以及 Sedum aizoon L.，对这四种植物对铜、镍、铅和锌的耐性、富集能力和迁移能力进行了研究。其中，S. aizoon 和 H. vulgaris 为铜超富集植物，而所有植物均为镍超富集植物。当铜浓度达到200 mg/L时，西伯利亚鸢尾在水中对铜的去除率最高，达到91.44%。在镍浓度梯度下，A. philoxeroides 的去除率始终保持在69%以上，远超其他植物。在铅浓度为200 mg/L的情况下，S. aizoon 在水中对铅的去除率最高，为98.84%。在四种锌浓度下，H. vulgaris 和 S. aizoon 的去除率保持稳定，均超过89%。因此，这些植物可在适宜情境下应用于设计含有有害重金属的废水生态友好型修复方案。