空心球形<strong>AlOOH</strong>的无模板水热制备和吸附性能

doi:10.11901/1005.3093.2022.509

材料研究学报

2023, Vol. 37

Issue (9): 675-684 DOI: 10.11901/1005.3093.2022.509

研究论文

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空心球形AlOOH的无模板水热制备和吸附性能

邵鸿媚¹(

), 崔勇¹, 徐文迪¹, 张伟¹, 申晓毅², 翟玉春²

^1.沈阳理工大学环境与化学工程学院沈阳 110159
^2.东北大学冶金学院沈阳 110819

Template-free Hydrothermal Preparation and Adsorption Capacity of Hollow Spherical AlOOH

SHAO Hongmei¹(

), CUI Yong¹, XU Wendi¹, ZHANG Wei¹, SHEN Xiaoyi², ZHAI Yuchun²

^1.School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, China
^2.School of Metallurgy, Northeastern University, Shenyang 110819, China

引用本文:

邵鸿媚, 崔勇, 徐文迪, 张伟, 申晓毅, 翟玉春. 空心球形AlOOH的无模板水热制备和吸附性能[J]. 材料研究学报, 2023, 37(9): 675-684.
Hongmei SHAO, Yong CUI, Wendi XU, Wei ZHANG, Xiaoyi SHEN, Yuchun ZHAI. Template-free Hydrothermal Preparation and Adsorption Capacity of Hollow Spherical AlOOH[J]. Chinese Journal of Materials Research, 2023, 37(9): 675-684.

全文: PDF(14977 KB) HTML

摘要:

以Al₂(SO₄)₃和尿素为原料用无模板水热法制备空心球形AlOOH，研究了Al³⁺/尿素配比、水热温度、水热时间和Al³⁺浓度对其结构和形貌的影响。结果表明，空心球形AlOOH由大量纳米薄片构成，其形成是一个沉淀、溶解再结晶的过程。AlOOH的比表面积和总孔体积较大，对刚果红的吸附性能良好，吸附10 min即达平衡，吸附容量达253.81 mg·g^-1。AlOOH循环再生4次，仍保持较高的吸附容量。吸附过程符合准二阶动力学模型。用Langmuir和Freundlich模型都能很好的拟合吸附数据。

关键词 ：无机非金属材料, 空心球形AlOOH, 无模板水热, 吸附, 形成过程

Abstract：

Hollow spherical AlOOH was successfully prepared by template-free hydrothermal method employing Al₂(SO₄)₃ and urea as raw materials. The appropriate preparation conditions were obtained after determining the influence of Al³⁺/urea molar ratio, hydrothermal temperature, time and Al³⁺ concentration on the structure and morphology of the prepared AlOOH. The hollow spherical structure consisted of a large number of nanoflakes possesses a high specific surface area and a total pore volume, whose formation is a process involving precipitation, dissolution and recrystallization. Hollow spherical AlOOH exhibits excellent adsorption capacity for Congo red with the adsorption equilibrium of 10 min and the maximal adsorption capacity of 253.81 mg·g^-1. The adsorption capacity still maintains a high level after 4 times of recycling. The pseudo-second-order model fits the adsorption process well. Both the Langmuir and Freundlich models fit the adsorption well.

Key words： inorganic non-metallic materials hollow spherical AlOOH template-free hydrothermal adsorption formation process

收稿日期: 2022-09-20

ZTFLH:

X75

基金资助:国家自然科学基金(52004165);辽宁省教育厅基本科研项目(LJKZ0254);辽宁省教育厅基本科研项目(LJKQZ2021056)

通讯作者: 邵鸿媚，shaohm@sylu.edu.cn，研究方向为功能材料制备与应用

Corresponding author: SHAO Hongmei, Tel: 18809893626, E-mail: shaohm@sylu.edu.cn

作者简介: 邵鸿媚，女，1986年生，副教授

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图1 Al3+/尿素摩尔比不同的AlOOH的XRD谱和SEM形貌

图2 反应温度不同的样品的XRD谱和SEM形貌

图3 反应时间不同的样品的XRD谱和SEM形貌

图4 Al3+浓度不同的AlOOH的XRD谱和SEM形貌

图5 AlOOH的SEM形貌和N2吸附-解吸曲线

图6 空心球形AlOOH的形成过程示意图

图7 空心球形AlOOH的吸附容量与时间和刚果红平衡浓度的关系

图8 拟二阶动力学和粒子内扩散模型的拟合曲线

表1 吸附刚果红的拟二阶和粒子内扩散模型动力学参数

图9 吸附刚果红的等温线模型

表2 Langmuir和Freundlich模型的拟合参数

表3 吸附刚果红过程的热力学参数

图10 吸附前后AlOOH的红外光谱

图11 吸附机理的示意图

图12 循环测试中AlOOH吸附刚果红容量的变化

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