一种兼顾吸附性和回收性的纤维状除P吸附剂

刘睿谦; 赵英杰; 薛利红; 杨林章

doi:10.13205/j.hjgc.202501012

一种兼顾吸附性和回收性的纤维状除P吸附剂

doi: 10.13205/j.hjgc.202501012

1. 江苏省农业科学院农业资源与环境研究所农业部长江下游平原农业环境重点实验室, 南京 210094;
2. 安徽理工大学地球与环境学院, 安徽淮南 232002

基金项目:

国家重点研发计划项目“南方典型农区氮磷迁移转化过程与面源污染发生及调控机制”(2021YFD1700805)

详细信息

作者简介:
刘睿谦(1995-),男,助理研究员,主要研究方向为纳米材料研发与农业应用。ruiqianliu@outlook.com

通讯作者:
薛利红(1975-),研究员,主要研究方向为农业面源污染治理。njxuelihong@gmail.com

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出版历程
- 收稿日期: 2024-05-08
- 录用日期: 2024-08-09
- 修回日期: 2024-07-30
- 网络出版日期: 2025-03-21
- 刊出日期: 2025-03-21

Preparation of a fibrous phosphorus adsorbent that balances adsorption performance and recovery properties

1. Key Laboratory of Agro-Environment in Downstream of Yangze Plain, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210094, China;
2. School of Earth and Environment, Anhui University of Science and Technology, Huainan 232002, China

摘要

摘要: 运用吸附法处理水体磷(P)污染时,吸附剂的吸附性能与回收性影响其实际应用的可行性。通过简易的浸渍焙烧法,成功研制出一种兼具优良吸附性能和良好回收性的镁改性纤维状磷酸盐吸附剂(MgO@CFF)。以该吸附剂为对象,在不同初始P浓度、共存离子及pH值的条件下,对所制备的MgO@CFF性能进行评估。实验结果表明:在3~7的宽泛pH值区间内,MgO@CFF对P的最大吸附量可达到11.23 mg/g;在各类外来阴离子存在时,其对磷酸盐仍具备超过50%的优先选择性;并且,MgO@CFF展现出快速吸附的特性,60 min时吸附量约达吸附平衡量的75%,约120 min达到吸附平衡;进行10次循环吸附/解吸实验,在后9次循环中MgO@CFF的吸附平衡量衰减仅为8%~10%,再生能力出色。经表征手段证实,MgO@CFF对磷酸盐主要通过放射性线状化学沉淀吸附。纤维状P吸附剂具备吸附效率高、速度快、选择性强以及易于与水分离等优势,在水体除磷领域或许具有广阔的应用前景。
- 纤维状吸附剂 /
- 快速吸附 /
- 分离性能 /
- 除P /
- 镁改性
Abstract: In the context of addressing the ever-increasing issue of phosphorus pollution in water bodies, the adsorption method has emerged as a promising approach. However, for an adsorbent to be truly viable in practical applications, its adsorption performance and recyclability play pivotal roles. These two aspects determine whether it can effectively remove phosphorus from water over an extended period and be reused economically and eco-friendly. Through a relatively straightforward yet effective impregnation-calcination technique, a novel magnesium-modified fibrous phosphate adsorbent, denoted as MgO@CFF, was successfully fabricated. This adsorbent was designed to possess both remarkable adsorption performance and satisfactory recyclability, aiming to overcome the limitations of many existing adsorbents in dealing with phosphorus-contaminated water. Subsequently, a series of comprehensive experiments were carried out with the MgO@CFF as the focus. Specifically, its performance was meticulously evaluated under diverse conditions that mimic real-world water environments, including different initial phosphorus concentrations, the presence of various coexisting ions, and a wide range of pH values. The obtained experimental results are quite significant. Firstly, within a broad pH interval spanning from 3 to 7, the maximum adsorption capacity of MgO@CFF can reach an impressive value of 11.23 mg-P/g. This indicates its robustness in handling phosphorus under a relatively wide range of acidity and alkalinity conditions that are common in natural and industrial water systems. Secondly, even when confronted with different types of foreign anions in the water, MgO@CFF still showcases its outstanding ability to selectively adsorb phosphate, with a preferential selectivity exceeding 50%. Furthermore, in terms of the adsorption kinetics, MgO@CFF exhibits a remarkable characteristic of rapid adsorption. At the 60-minute mark during the adsorption process, the amount of phosphorus adsorbed by it is approximately 75% of the final adsorption equilibrium amount. It reaches the adsorption equilibrium state at around 120 minutes. This fast adsorption speed implies that it can quickly reduce the phosphorus concentration in water, which is highly beneficial for practical water treatment operations with time constraints. Another notable aspect is its recyclability. After undergoing 10 cycles of adsorption/desorption experiments, it is found that in the latter 9 cycles, the attenuation of the adsorption equilibrium amount of MgO@CFF is only in the range of 8% to 10%. Such a low attenuation rate demonstrates its excellent regeneration ability, meaning that it can be reused multiple times without significant loss of adsorption performance, thereby reducing the overall cost and environmental impact associated with the adsorbent replacement. It is of particular interest that through a series of advanced characterization means, it has been verified that MgO@CFF mainly implements radial linear chemical precipitation adsorption for phosphate. This unique adsorption mechanism is rather distinct and has been scarcely reported in previous studies. It provides new insights into the understanding of how this adsorbent interacts with phosphorus in water and might inspire further research in this field. In conclusion, the fibrous phosphorus adsorbent MgO@CFF has multiple appealing features such as high adsorption efficiency, rapid adsorption speed, strong selectivity for phosphorus, and ease of separation from water. Given these advantages, it holds great promise and is likely to have broad application prospects in phosphorus removal from water bodies, contributing to quality improvement and sustainable management of water resources.
- fibrous adsorbent /
- rapid adsorption /
- separation performance /
- phosphorus removal /
- magnesium modification

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参考文献(49)

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