不同碱源对合成 MgAl-LDHs 的结构及除氯性能的影响

金属矿山 ›› 2023, Vol. 52 ›› Issue (11): 101-109.

• “矿物材料基础理论与应用技术”专题 • 上一篇下一篇

不同碱源对合成 MgAl-LDHs 的结构及除氯性能的影响

易春健^1,² 刘淑贤^1,² 黄宏^1,² 聂轶苗^1,² 王玲^1,² 王龙^1,2

1. 华北理工大学矿业工程学院,河北唐山 063210;2. 河北省矿业开发与安全技术重点实验室,河北唐山 063210

出版日期:2023-11-15 发布日期:2024-01-02
基金资助:
国家自然科学基金项目(编号:52004091);中央引导地方科技发展资金项目(编号:236Z3804G);河北省自然科学基金项目(编号:E2022209119)。

Influence of Different Alkaline Agents on the Structure and Dechlorination Performance of MgAl-LDHs Synthesized

YI Chunjian^1,2LIU Shuxian^1,2HUANG Hong^1,2NIE Yimiao^1,2WANG Ling^1,2 WANG Long^1,2 #br#

1. School of Mining Engineering,North China University of Science and Technology,Tangshan 063210,China；2. Key Laboratory of Mining Exploitation and Security Technology of Hebei Province,Tangshan 063210,China

Online:2023-11-15 Published:2024-01-02

摘要/Abstract

摘要： 为了获得除氯性能较好的镁铝类水滑石,研究了碱源对合成镁铝类水滑石的结构及除氯性能的影响。采用水热合成法,分别以尿素和氢氧化钠为碱源,硝酸根金属盐溶液为前驱体合成了 LDHs-A 和 LDHs-B,采用 XRD、 SEM、BET、FTIR 测试分析了不同碱源对镁铝类水滑石微观形貌的影响,通过氯离子吸附试验比较了 2 种类水滑石的除氯性能及除氯机理。结果表明,LDHs-A 和 LDHs-B 均具有类水滑石结构的 XRD 特征峰,呈片层状结构,晶粒尺寸分别为 1 000~ 2 000 nm、200~ 400 nm,比表面积分别为 40. 804 m2 / g、62. 609 m2 / g,饱和吸附量分别为 45. 41 mg / g 和 78. 69 mg / g。 LDHs-A 为碳酸根插层镁铝类水滑石,LDHs-B 为硝酸根插层镁铝类水滑石。 LDHs-A 符合准一级动力学模型和 Langmuir 吸附等温模型,除氯机理主要为单层物理吸附;LDHs-B 符合准二级动力学模型和 Langmuir 吸附等温模型,除氯机理主要为单层化学吸附。

关键词: 类水滑石, 水热合成法, 氯离子, 吸附材料

Abstract: In order to obtain Mg-Al hydrotalcite with gread dechlorination performance,the effect of alkali source on the structure and dechlorination performance of Mg-Al hydrotalcite was studied. In this paper,LDHs-A and LDHs-B were synthesized by hydrothermal synthesis method using urea and sodium hydroxide as base sources and metal nitrate salt solution as precursor,respectively. XRD,SEM,BET and FTIR tests were used to analyze the effects of different base sources on the microstructure of Mg-Al hydrotalcite. The dechlorination properties and mechanism of two kinds of hydrotalcite were compared by chloride ion adsorption experiment. The results show that LDHs-A and LDHs-B have XRD peaks similar to hydrotalcite structure,with lamellar structure,grain sizes of 1 000~ 2 000 nm and 200~ 400 nm,and specific surface areas of 40. 804 m2 / g and 62. 609 m2 / g,respectively. The saturated adsorption capacities were 45. 41 mg / g and 78. 69 mg / g,respectively. LDHs-A is magnesium and aluminum hydrotalcite by carbonate intercalation and LDHs-B is magnesium and aluminum hydrotalcite by nitrate intercalation. LDHs-A conforms to the quasi-first-order kinetic model and Langmuir adsorption isothermal model,and the dechlorination mechanism is mainly single-layer physical adsorption;LDHs-B conforms to the quasi-second-order kinetic model and Langmuir adsorption isothermal model,and the dechlorination mechanism is mainly single-layer chemisorption.

Key words: hydrotalcite-like,hydrothermal synthesis,chloride ion,adsorption material

易春健, 刘淑贤, 黄宏, 聂轶苗, 王玲, 王龙. 不同碱源对合成 MgAl-LDHs 的结构及除氯性能的影响[J]. 金属矿山, 2023, 52(11): 101-109.

YI Chunjian, LIU Shuxian, HUANG Hong, NIE Yimiao, WANG Ling, WANG Long. Influence of Different Alkaline Agents on the Structure and Dechlorination Performance of MgAl-LDHs Synthesized[J]. Metal Mine, 2023, 52(11): 101-109.

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不同碱源对合成 MgAl-LDHs 的结构及除氯性能的影响

Influence of Different Alkaline Agents on the Structure and Dechlorination Performance of MgAl-LDHs Synthesized

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