School of Environmental Science and Engineering, Changzhou University, Changzhou, 213164, China.
Environ Sci Pollut Res Int. 2024 Jul;31(31):43687-43703. doi: 10.1007/s11356-024-33969-5. Epub 2024 Jun 21.
In this paper, Bayer red mud (RM) and lotus leaf powder (LL) were used as the main materials, and KHPO was added to modify the material. Under the condition of high-temperature carbonization, RMLL was prepared and phosphate modified red mud matrix composite (PRMLL) was prepared based on KHPO modification, which can effectively remove Pb from water. The optimum preparation and application conditions were determined through orthogonal experiment: dosage 0.1g, ratio 1:1, and temperature 600 °C. The effects of pH, dosage, and initial concentration on the adsorption of Pb were studied. The pseudo-first-order, pseudo-second-order, and Elovich kinetic models were fitted to the experimental data. It was found that RMLL and PRMLL were more consistent with the pseudo-second-order kinetic model and chemisorption. Langmuir, Freundlich, Timkin, and Dubinin-Radushkevich isothermal adsorption models were used to fit the experimental data. It was found that RMLL and PRMLL were more consistent with Langmuir model. In addition, the maximum adsorption capacity of RMLL and PRMLL was 188.1 mg/g and 213.4 mg/g, respectively. It is larger than the adsorption capacity of their monomers. Therefore, the use of RMLL and PRMLL as the removal of Pb from water is a potential application material.
本文以拜耳赤泥（RM）和荷叶粉（LL）为主要原料，添加 KHPO 对其进行改性，高温碳化条件下制备 RMLL，并基于 KHPO 改性制备磷酸盐改性赤泥基质复合材料（PRMLL），可以有效去除水中的 Pb。通过正交实验确定了最佳的制备和应用条件：用量 0.1g、比例 1:1、温度 600°C。研究了 pH 值、用量和初始浓度对 Pb 吸附的影响。对实验数据进行了拟一级、拟二级和 Elovich 动力学模型拟合。结果表明，RMLL 和 PRMLL 更符合拟二级动力学模型和化学吸附。采用 Langmuir、Freundlich、Timkin 和 Dubinin-Radushkevich 等温吸附模型对实验数据进行拟合，结果表明 RMLL 和 PRMLL 更符合 Langmuir 模型。此外，RMLL 和 PRMLL 的最大吸附容量分别为 188.1 mg/g 和 213.4 mg/g，大于其单体的吸附容量。因此，将 RMLL 和 PRMLL 作为去除水中 Pb 的材料具有潜在的应用价值。
