Adsorption performance and mechanism of HFO/pumice composites for phosphate in water

IF 2 4区环境科学与生态学 Q2 LIMNOLOGY

Limnologica Pub Date : 2025-02-21 DOI:10.1016/j.limno.2025.126237

Jian Huang , Xianjin Qiu , Hua Zhang , Chenxi Zhang , Zhuoyi Lu , Tao Luo , Chunhua He , Jiamei Zhang , Zichen Shuai

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Abstract

Excessive phosphorus is a principal cause of water eutrophication. Adsorption is an effective method for phosphorus removal. Yet there is little research on the adsorption performance and mechanism of phosphorus with HFO (hydrous ferric oxide)/pumice composites. In this study, the HFO/pumice composites were prepared, and the adsorption performance and mechanism of HFO/pumice composites for phosphorus were researched. The results indicated that the phosphorus adsorption performance reached a maximum value of 5.69 mg·g⁻¹ when the pH was 7. The adsorption performance increased with temperature. Moreover, when Cl^-, SO₄^2- and HCO₃^- coexisted, HCO₃^- had a greater effect on the adsorption performance of the HFO/pumice composites for phosphorus, and the adsorption performance decreased gradually with the increase of HCO₃^- concentration. The adsorption isotherms indicated that the Langmuir isotherm model was more suitable to describe the adsorption behavior of the HFO/pumice composites for phosphorus, and the correlation coefficient was 0.9785. In addition, the pseudo-second-order kinetic was more consistent with the adsorption mechanism of HFO/pumice composites for phosphorus. The internal diffusion model showed that the combination of external mass transfer and internal diffusion controlled the adsorption rate of the HFO/pumice composites for phosphorus. The experimental results showed that the adsorption mechanisms of HFO/pumice composites for phosphorus mainly involved pore filling, electrostatic interaction, and surface complexation.

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HFO/浮石复合材料对水中磷酸盐的吸附性能及机理

磷过量是水体富营养化的主要原因。吸附法是一种有效的除磷方法。但目前对氢氧化铁/浮石复合材料对磷的吸附性能及机理的研究较少。本研究制备了HFO/浮石复合材料，研究了HFO/浮石复合材料对磷的吸附性能及机理。结果表明，当pH = 7时，磷的吸附性能达到最大值5.69 mg·g−1。吸附性能随温度升高而升高。此外，当Cl-、SO42-和HCO3-同时存在时，HCO3-对HFO/浮石复合材料对磷的吸附性能影响较大，吸附性能随着HCO3-浓度的增加而逐渐降低。吸附等温线结果表明，Langmuir等温线模型更适合描述HFO/浮石复合材料对磷的吸附行为，相关系数为0.9785。此外，伪二级动力学更符合HFO/浮石复合材料对磷的吸附机理。内部扩散模型表明，外部传质和内部扩散共同控制了HFO/浮石复合材料对磷的吸附速率。实验结果表明，HFO/浮石复合材料对磷的吸附机制主要包括孔隙填充、静电相互作用和表面络合。

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来源期刊

Limnologica 环境科学-湖沼学

CiteScore

3.70

自引率

5.90%

发文量

审稿时长

3 months

期刊介绍： Limnologica is a primary journal for limnologists, aquatic ecologists, freshwater biologists, restoration ecologists and ecotoxicologists working with freshwater habitats.