不同海藻吸附重金属镉离子的研究

本文采用6种分别属于褐藻门、绿藻门、红藻门的海边常见大型海藻对重金属镉离子进行吸附比较实验，镉离子浓度较低时，其吸附容量排列顺序为：海黍子＞海带＞孔石莼＞节荚藻＞刺松藻＞内枝藻，海黍子的吸附量高达181mg/g，超出文献报道值，对3种吸附容量较高的海藻进行了较详细的研究，研究溶液的pH值、初始Cd^2 离子浓度等因素对Ca^2 的吸附特性的影响，对吸附机理进行了初步的探讨，发现镉离子与海藻中的钙离子发生离子交换作用，交换率占总吸附量的33－34％，得出了适宜的吸附等温线方程。

INVESTIGATION OF CADMIUM (Ⅱ) BIOSORPTION ON SIX Marine algae

Six marine algae such as Sargassum kjellmanum, Laminaris japonica, Codium fragile, Ulva pertusa, Lomentaria hakodatensis and Entocladia wittrockii as biosorbents were investigated under the following experimental conditions: pretreatment, pH, initial cadmium concentration. Among them, Sargassum kjellmanum, Laminaris japonica and Ulva pertusa have relatively high adsorption capacity of 181mg/g, 124.7 mg/g, 143.3 mg/g, respectively. pH value has different effects on those three algae. Results demonstrate the existence of ion exchange between Ca2+ in algae and Cd2+ in solution and the uptake ratio produced by ion exchange between Ca2+ and Cd2+ is about 33-34% of total Cd2+ uptake. Freundlich equation has modeled the adsorption processes by Sargassum kjellmanum and by Ulva pertusa well, Dubimim-Radushkevich equation fits the adsorption process by Laminaris japonica well.