College of Materials Science and Engineering, Fuzhou University, Fujian, China.
PLoS One. 2013;8(4):e60243. doi: 10.1371/journal.pone.0060243. Epub 2013 Apr 2.
Phosphate removal to a hydrothermally modified fumed silica and pulverized oyster shell material for use in wastewater treatments were made. Sorption data modeling (pH's 3-11, P concentrations of 3, 5, 10, 15, 20, & 25 mg/L, and at an ambient temperature of 23°C) indicate that an optimal removal of P occurs at pH 11. Three kinetic models were also applied (a pseudo-first-order Lagergren kinetic model, a pseudo-second-order (PSO) kinetic and Elovich) and indicate that a PSO model best describes P-removal. In addition, an application of the Weber and Morris intra-particle diffusion model indicates that external mass transfer and intra-particle diffusion were both involved in the rate-determining step. Langmuir, Freundlich modeling of the sorption data also indicate that the heterogeneous Freundlich sorption site model best describes the data although Langmuir data also fit with data tailing suggesting data are not linear. The data collected indicates that the hydrothermally modified fumed silica and pulverized oyster shell material is suitable for use in wastewater treatment, with P-removal to the solids being preferential and spontaneous.
对一种经水热改性的气相二氧化硅和粉碎的牡蛎壳材料进行了除磷研究，以用于废水处理。吸附数据模型（pH 值为 3-11、磷浓度为 3、5、10、15、20 和 25 mg/L，环境温度为 23°C）表明，磷的最佳去除 pH 值为 11。还应用了三种动力学模型（拟一级 Lagergren 动力学模型、拟二级（PSO）动力学和 Elovich 模型），表明 PSO 模型最能描述磷的去除。此外，Weber 和 Morris 内颗粒扩散模型的应用表明，外部传质和内颗粒扩散都参与了速率决定步骤。吸附数据的 Langmuir 和 Freundlich 模型也表明，尽管 Langmuir 数据也符合数据尾部，表明数据不是线性的，但非均相 Freundlich 吸附位模型最能描述数据。收集的数据表明，经水热改性的气相二氧化硅和粉碎的牡蛎壳材料适用于废水处理，磷优先和自发地被去除到固体中。
