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首页> 外文期刊>International journal of structural integrity >Chloride ion entrapment by calcined layered double hydroxides
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Chloride ion entrapment by calcined layered double hydroxides

机译：煅烧的层状双氢氧化物截留氯离子

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Purpose - Magnesium-aluminum layered double hydroxides (LDH) with a platelet-like morphology were synthesized through a modified co-precipitation method. The purpose of this paper is to investigate calcined Mg-Al-CO_3 LDH (CLDH) as chloride ion traps. Design/methodology/approach - The morphology and chemical composition of the synthesized materials were studied through UHR-SEM, EDS, FT-IR and XRD. The chloride ion adsorption was confirmed by XRD; the characteristic diffraction peaks of the reconstructed LDH structure were revealed, similar to the one before the thermal treatment process. The effect of varying the experimental conditions on the chloride ion adsorption, such as the initial target-ion concentration, the adsorbent material dosage, the solution temperature and the solution pH was also investigated. Findings - The experimental data fitting revealed that the Langmuir equation is a better model on the basis of correlation coefficients (R~2) and that the pseudo-second kinetic model can satisfactorily describe the chloride ion uptake. Originality/value - The ability of Mg-Al CLDH to recover their layered structure upon exposure to aqueous sodium chloride solutions with concentrations up to 0.3 M (10,636 mg/L) through the chloride adsorption and the simultaneous rehydration process is clearly demonstrated.
机译：目的-通过改进的共沉淀法合成具有片状形态的镁铝层状双氢氧化物（LDH）。本文的目的是研究煅烧的Mg-Al-CO_3 LDH（CLDH）作为氯离子阱。设计/方法/方法-通过UHR-SEM，EDS，FT-IR和XRD研究了合成材料的形态和化学组成。用XRD确认氯离子的吸附。揭示了重构的LDH结构的特征衍射峰，类似于热处理工艺之前的峰。还研究了改变实验条件对氯离子吸附的影响，例如初始目标离子浓度，吸附剂用量，溶液温度和溶液pH。研究结果-实验数据拟合表明，基于相关系数（R〜2），Langmuir方程是一个更好的模型，伪秒动力学模型可以令人满意地描述氯离子的吸收。原创性/价值-清楚地证明了Mg-Al CLDH在暴露于浓度高达0.3 M（10,636 mg / L）的氯化钠水溶液中时通过氯化物吸附和同时进行再水化过程而恢复其层状结构的能力。

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