改性赤泥对水中Mn(Ⅱ)的高效吸附性能及其机制研究-湖南生态科学学报-CSCIED科技核心评价数据库-手机版

改性赤泥对水中Mn(Ⅱ)的高效吸附性能及其机制研究

High-Efficiency Adsorption Performance and Mechanism of Modified Red Mud for Mn(Ⅱ) in Water

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DOI	10.3969/j.issn.2095-7300.2025.01.001
刊名	湖南生态科学学报 Journal of Hunan Ecological Science
年，卷(期)	2025, 12(1)
作者	黄先宇,谭焱,张浩宇,杨远*,
作者单位	湖南农业大学环境与生态学院,湖南长沙
摘要	【目的】通过优化参数,确定改性赤泥吸附废水中的Mn(Ⅱ)的最优条件,为今后废水的治理提供一些理论基础和数据参考。【方法】采用高温对赤泥改性,研究改性赤泥对Mn(Ⅱ)的吸附性能和动力学特性,考察改性温度、溶液pH值、改性赤泥投加量、Mn(Ⅱ)初始浓度、吸附时间、吸附温度对吸附效率的影响,并通过X射线衍射(XRD)、傅里叶变换红外光谱仪(FTIR)和扫描电子显微镜(SEM)等表征方式分析改性赤泥去除Mn(Ⅱ)的机理。【结果】在800℃下改性赤泥,设定pH为8,投加量为5g/L,初始浓度为50mg/L,吸附温度维持在25℃,反应时间设定为2h,可实现对Mn(Ⅱ)的100%去除。在其他条件不变的情况下,提高Mn(Ⅱ)初始浓度或吸附温度会导致去除率下降;而增加改性赤泥的投加量则能显著提升去除率,5g/L时达到最大去除效率。此外,提高pH值可增强去除效果。吸附动力学和等温线均符合Freundlich模型和准一级动力学模型,表明吸附过程为放热反应。通过XRD、FTIR和SEM-EDS分析改性赤泥吸附前后的物理化学特性,结果显示改性赤泥具有高比表面积和多孔结构。吸附过程中,—OH和C—O基团与Mn(Ⅱ)反应生成氧化物,揭示了化学吸附和物理吸附共同参与的吸附机制。【结论】提高温度不利于改性赤泥的吸附,而提高赤泥投加量、pH及延长吸附时间,均可促进改性赤泥对Mn(Ⅱ)的吸附作用且改性赤泥对Mn(Ⅱ)的吸附为物理吸附与化学吸附共同作用。
Abstract	【Objective】By optimizing the parameters, the optimal conditions for the adsorption of Mn(Ⅱ) from wastewater using modified red mud were established. This study provided a theoretical foundation and data reference for future wastewater treatment efforts. 【Method】Red mud was modified through high-temperature treatment. The adsorption properties and kinetics of Mn(Ⅱ) on the modified red mud were investigated. The effects of modification temperature, solution pH, dosage of modified red mud, initial concentration of Mn(Ⅱ), adsorption time, and adsorption temperature on the efficacy of ad- sorption were examined. The mechanism underlying the removal of Mn(Ⅱ) was analyzed using X-ray diffraction (XRD), Fourier transform infrared spectrometer (FTIR), and scanning electron microscopy (SEM). 【Result】When the modification temperature of red mud was set at 800 ℃, with a pH value of 8, a dosage of 5 g / L, an initial concentration of 50 mg / L, and an adsorption temperature of 25 ℃, the removal rate of Mn(Ⅱ) from the modified red mud reached 100% after a reaction time of two hours. Un- der constant conditions for other parameters, it was observed that the removal rate decreased as both the initial concentration and adsorption temperature increased. Furthermore, increasing the dosage of modified red mud enhanced the Mn(Ⅱ) removal efficiency. Specifically, at a dosage level of 5 g / L, the Mn(Ⅱ) adsorption rate achieved complete removal at 100% . The adsorption kinetics and isotherm con- formed to the Freundlich equation and the quasi-first-order kinetic equation, and the adsorption process was an exothermic reaction. The modified red mud before and after adsorption was characterized by XRD, FTIR, and SEM-EDS. The results indicated that the modified red mud had a loose porous structure and a large specific surface area. During the adsorption of heavy metal ions, —OH and C—O groups reacted with Mn (Ⅱ) to form oxides, revealing the adsorption mechanism of chemical adsorption and physical adsorption. 【Conclusion】The increase in temperature is adverse to the adsorption by modified red mud, while the increase in red mud dosage, adsorption time, and pH can facilitate the ad- sorption of Mn(Ⅱ) in modified red mud. Furthermore, the adsorption of Mn(Ⅱ) in modified red mud is a combination of physical and chemical adsorption.
关键词	改性赤泥;锰;吸附
KeyWord	modified red mud; Mn; adsorption
基金项目
页码	1-11

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黄先宇,谭焱,张浩宇,杨远*. 改性赤泥对水中Mn(Ⅱ)的高效吸附性能及其机制研究 [J]. 湖南生态科学学报. 2025; 12; (1). 1 - 11.

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