商陆生物炭对Pb离子吸附的优势

The advantages of Shanglu biochar for Pb ion adsorption

本研究实验以Zn、Cd作对照,探究在单一重金属溶液中商陆生物炭对Pb离子吸附效果与溶液初始浓度、溶液pH值、吸附剂投加量的相关性,以及在复合重金属溶液中商陆生物炭对Pb离子吸附效果与吸附温度、吸附时间的相关性。本研究用Langmuir等温模型、准一级热动力学模、准二级热动力学模型,分别拟合在复合重金属溶液中商陆生物炭对Zn、Cd、Pb离子吸附优势与吸附温度、吸附时间的关系,研究发现:用Langmuir等温模型、准二级热动力学模型拟合商陆生物炭在复合重金属溶液中对Zn、Cd、Pb的吸附量可信度更高;在单一重金属溶液中商陆生物炭对Pb离子的最大吸附量分别是Zn、Cd离子的3.54倍、3.18倍;在复合重金属溶液中商陆生物炭对Pb离子的最大吸附量分别是Zn、Cd的2.97倍、2.88倍。因此,商陆生物炭对Pb离子的吸附量优势,为对单一(复合)重金属溶液中Pb离子的回收利用提供了物质基础。

In the experiment,Zn and Cd were used as controls to explore the correlation between the adsorption effect of Phytolacca biochar on Pb ion and the initial concentration of the solution,the pH value of the solution,and the dosage of adsorbent in a single heavy metal solution.To explore the correlation between the adsorption effect of Pb ions and adsorption temperature and adsorption time of pokeweed biochar in the composite heavy metal solution.The Langmuir isotherm model,the quasi-first-order thermodynamic model,and the quasi-second-order thermodynamic model were used to fit the relationship between the adsorption advantages of pokeweed biochar for Zn,Cd,and Pb ions in the composite heavy metal solution and the adsorption temperature and time.The study found that the Langmuir isotherm model and the quasi-two-stage thermodynamic model are used to fit the adsorption capacity of Pokeweed Biochar in the composite heavy metal solution for Zn,Cd,and Pb with higher reliability;In a single heavy metal solution,the maximum adsorption capacity of Phytolacca biochar for Pb ions is 3.54 times and 3.18 times that of Zn and Cd ions respectively;In the composite heavy metal solution,the maximum adsorption capacity of Pb ions by Pokeweed Biochar was 2.97 times andutilization of Pb ions in a single(composite)heavy metal solution.2.88 times that of Zn and Cd,respectively.Pokeweed Biochar′s advantages in the amount of Pb ions adsorbed provide a material basis for the recovery and.