羊栖菜粉对水溶液中Cu2+的吸附效果

以羊栖菜粉为吸附剂,研究羊栖菜粉对水溶液中Cu²⁺的吸附特性及吸附机理,考察羊栖菜对重金属铜的吸附能力,以扩展羊栖菜的综合利用范围。采用控制变量法考察pH值、吸附剂浓度、金属离子初始浓度和离子强度等环境因素对水溶液中Cu²⁺去除效果的影响,通过模拟吸附动力学和热力学试验考察羊栖菜粉对Cu²⁺的吸附特性,并采用SEM、FTIR等方法初步分析了羊栖菜粉对Cu²⁺的吸附机理。结果表明,在吸附温度35℃、初始浓度50 mg·L^-1、吸附剂浓度1 g·L^-1条件下,羊栖菜粉对Cu²⁺的去除率可达89.27%。当吸附时间为10 min时,Cu²⁺去除率达总去除率的90%以上;当吸附时间为60 min时,基本达到吸附平衡。羊栖菜粉吸附Cu²⁺的动力学数据符合准二级动力学模型,相关系数均在0.999 0以上。Langmuir可以很好地拟合热力学试验得到的平衡数据,理论最大吸附容量为71.17 mg·g^-1。羊栖菜粉对Cu²⁺的吸附有多种反应参与,参与络合反应的官能团主要有-OH、-NH、-COO^-。羊栖菜粉对Cu²⁺的去除率较高,吸附性能良好,可通过解吸实现吸附剂的再生。

The Adsorption of Aquatic Copper(Ⅱ) by Sargassum fusiforme Powder

The adsorption characteristics and mechanisms of Cu²⁺ in an aqueous solution were studied by using Sargassum fusiforme(S. fusiforme)powder as the adsorbent. Which can possibly expand the utilization range of S. fusiforme. The effects of environmental factors (pH, adsorbent concentration, and initial concentration of metal ions and ionic strength) on the removal efficiency of Cu²⁺ in aqueous solution were investigated through controlled variable method. The adsorption characteristics of Cu²⁺ were investigated by simulated adsorption kinetics experiment and thermodynamics experiment. The adsorption mechanism of S.fusiforme powder on Cu²⁺ was analyzed by SEM and FTIR. The results showed that the removal rate of Cu²⁺ by S.fusiforme powder was 89.27% at 35℃ when the initial concentration and adsorbent concentration were 50 mg·L^-1and 1 g·L^-1, respectively. When the adsorption time was prolonged to 10 min, the removal rate of Cu²⁺ reached more than 90%. The adsorption equilibrium was reached when the adsorption time was prolonged to 60 min. The kinetic data of Cu²⁺ adsorbed by S.fusiforme powder were in accordance with the Quasi-second-order kinetic model, and the correlation coefficients were all above 0.999 0. Langmuir could well fit the equilibrium data obtained by thermodynamic experiments, and the theoretical maximum adsorption capacity of S.fusiforme powder on Cu²⁺ was 71.17 mg·g^-1. The adsorption of Cu²⁺ by S.fusiforme powder through different reactions, the functional groups involved in complex reaction mainly were -OH, -NH and -COO^—. S.fusiforme powder had a higher removal rate of Cu²⁺ and showed agood adsorption performance. The regeneration of the adsorbent could be achieved by desorption.