School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266033, PR China.
Shandong Huankeyuan Environmental Engineering Co., Ltd, Jinan, 250013, PR China.
Chemosphere. 2022 Jan;286(Pt 3):131862. doi: 10.1016/j.chemosphere.2021.131862. Epub 2021 Aug 13.
The ubiquitous presence of inorganic and organic phosphorus in wastewater and natural water bodies has deteriorated the water environment qualities and exerted significant influences on ecosystems. In this study, an effective polypyrrole modified red mud adsorbent (PRM) was optimized for the adsorptive removal of inorganic and organic phosphorus from aqueous solutions. The addition of ferric chloride and pyrrole was optimized for complete oxidation and modification of polypyrrole onto red mud. Kinetic studies illustrated that the adsorption progress was accomplished by physical and chemical adsorption. The experimental data of the optimized PRM were described well by Langmuir isotherm, and the equilibrium adsorption capacity was 32.9 and 54.7 mg/g for inorganic and organic phosphorus, respectively. The PRM showed commendable adsorption performance despite the pH conditions ranging from 3 to 11. From the effect of ion strength and X-ray photoelectron spectroscopy (XPS) tests, we found that ligand exchange is the main mechanism of orthophosphate adsorption onto PRM, while electrostatic attraction played an important role in organic phosphorus adsorption. The adsorption performance from column studies showed that the velocity of flow influenced the breakthrough time of the column but the initial concentration had minor impacts. This study would extend the potential application of polypyrrole modified red mud, acting as an efficient adsorbent for inorganic and organic phosphorus adsorption in water treatment.
废水中和天然水体中普遍存在无机磷和有机磷，这恶化了水环境质量，并对生态系统产生了重大影响。在本研究中，优化了一种有效的聚吡咯修饰赤泥吸附剂（PRM），用于从水溶液中吸附去除无机磷和有机磷。优化了添加三氯化铁和吡咯的条件，以实现聚吡咯对赤泥的完全氧化和修饰。动力学研究表明，吸附过程是通过物理和化学吸附完成的。优化后的 PRM 的实验数据很好地符合朗缪尔等温线，其对无机磷和有机磷的平衡吸附容量分别为 32.9 和 54.7 mg/g。PRM 表现出良好的吸附性能，即使在 pH 值为 3 到 11 的条件下也是如此。从离子强度的影响和 X 射线光电子能谱（XPS）测试的结果来看，我们发现配位交换是 PRM 吸附正磷酸盐的主要机制，而静电吸引在有机磷吸附中起着重要作用。柱研究中的吸附性能表明，流速会影响柱的穿透时间，但初始浓度的影响较小。本研究将扩展聚吡咯修饰赤泥的潜在应用，作为一种用于水处理中无机磷和有机磷吸附的高效吸附剂。
