以城市污泥和赤泥为原料制备镁铁铝层状氢氧化物的新方法，以提高废水中磷酸盐的去除效果

IF 2.4 4区生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Journal of chemical technology and biotechnology Pub Date : 2025-06-27 DOI:10.1002/jctb.70006

Yuxin Liu, Huidong Li, Kai Cui, Peizu Liu, Jing Guo, Junming Yi, Dongsheng Feng, Ruihui Gong, Jiangzhe Fu

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引用次数: 0

摘要

磷酸盐是动植物的重要营养物质，但磷酸盐过量会导致水体富营养化，破坏水生生态环境。赤泥是一种粉状铝工业废渣，具有粒度小、碱度强、重金属含量高等特点。结果以城市污泥和赤泥为原料合成了污泥基生物炭。采用火法和湿法相结合的方法提取赤泥中的金属元素作为三价金属离子源。采用化学共沉淀法合成了层状双金属氢氧化物（LDH）改性生物炭材料（Mg-Fe /Al LDH@biochar）。为解决粉末状物料不便于回收和运输的问题，用水玻璃改性聚乙烯醇合成了一种粘结剂，将粉末状Mg-Fe /Al LDH@biochar粘结成颗粒状。吸附过程符合Freundlich等温吸附模型和拟二级动力学模型。在35°C时，Freundlich拟合材料对磷酸盐的最大吸附量为35.49 mg g−1。ldh改性生物炭复合材料去除磷酸盐的主要机理包括静电相互作用、配体交换和孔扩散。结论我们成功地合成了ldh修饰的颗粒状生物炭。该材料硬度好，耐水性强，磷酸盐吸附能力强，可有效去除废水中的磷酸盐，同时为赤泥处理提供了新的途径。©2025化学工业学会（SCI）。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

A novel preparation method for Mg–Fe/Al layered hydroxides derived from municipal sludge and red mud to enhance phosphate removal from wastewater

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A novel preparation method for Mg–Fe/Al layered hydroxides derived from municipal sludge and red mud to enhance phosphate removal from wastewater

BACKGROUND

Phosphates are important nutrients for animals and plants, but excessive phosphate can lead to eutrophication of water bodies and damage the aquatic ecological environment. Red mud is a powdery aluminium industrial waste with various characteristics such as small particle size, strong alkalinity and high heavy metal content.

RESULTS

This study synthesized a sludge-based biochar using municipal sludge and red mud as raw materials. The metal elements in the red mud were extracted by pyrometallurgy combined with hydrometallurgy as trivalent metal ion sources. A layered bimetallic hydroxide (LDH)-modified biochar material (Mg–Fe/Al LDH@biochar) was synthesized by a chemical coprecipitation method. In order to solve the problem that powdered materials are unfavorable for recycling and transportation, a binder was synthesized by modifying poly(vinyl alcohol) with sodium silicate to bond powdered Mg–Fe/Al LDH@biochar into granules. The adsorption process conforms to the Freundlich isotherm adsorption model and pseudo-second-order kinetic model. At 35 °C, the Freundlich fitted material has a maximum adsorption capacity of 35.49 mg g⁻¹ for phosphate. The main removal mechanisms of phosphate by the LDH-modified biochar composite material include electrostatic interactions, ligand exchange and pore diffusion.

CONCLUSION

We successfully synthesized granular LDH-modified biochar. This material exhibits good hardness, strong water resistance and high phosphate adsorption capacity, enabling effective phosphate removal from wastewater while simultaneously offering a new approach for red mud treatment. © 2025 Society of Chemical Industry (SCI).

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来源期刊

Journal of chemical technology and biotechnology 工程技术-工程：化工

CiteScore

7.00

自引率

5.90%

发文量

268

审稿时长

1.7 months

期刊介绍： Journal of Chemical Technology and Biotechnology(JCTB) is an international, inter-disciplinary peer-reviewed journal concerned with the application of scientific discoveries and advancements in chemical and biological technology that aim towards economically and environmentally sustainable industrial processes.