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

LIU Ruiqian; ZHAO Yingjie; XUE Lihong; YANG Linzhang

doi:10.13205/j.hjgc.202501012

Volume 43 Issue 1

Mar. 2025

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2025 > 43(1): 107-117

LIU Ruiqian, ZHAO Yingjie, XUE Lihong, YANG Linzhang. Preparation of a fibrous phosphorus adsorbent that balances adsorption performance and recovery properties[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(1): 107-117. doi: 10.13205/j.hjgc.202501012

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LIU Ruiqian, ZHAO Yingjie, XUE Lihong, YANG Linzhang. Preparation of a fibrous phosphorus adsorbent that balances adsorption performance and recovery properties[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(1): 107-117. doi: 10.13205/j.hjgc.202501012

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

doi: 10.13205/j.hjgc.202501012

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

Received Date: 2024-05-08
Accepted Date: 2024-08-09
Rev Recd Date: 2024-07-30

Available Online: 2025-03-21

Publish Date: 2025-03-21

Abstract

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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References(49)

References

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