水滑石制备及对铀酰离子的吸附探究
首发时间:2021-05-14
摘要:随着核工业的发展,含铀工业废水大量排放,这严重威胁了周围的生态环境和人类健康。吸附法是处理污染水源常用的一种方法,其核心是吸附剂,但目前报道的吸附剂存在成本高,吸附容量较低等问题,本论文以简单的尿素水热法一步合成了Ni-Al(LDH-N)和Mg-Al(LDH-M)两种水滑石作为吸附剂,通过XRD,SEM和TEM对吸附剂的结构和形貌进行了表征,使用DLS,EDX和FT-IR对吸附剂吸附铀酰离子的吸附行为进行探究,考察了接触时间、吸附剂添加量和PH对铀酰离子吸附容量的影响,并对数据进行吸附动力学、吸附等温线以及吸附热力学分析。结果表明,LDH-N和LDH-M在温度25℃、pH=7、接触时间1h、吸附剂添加量10mg时具有最高的饱和吸附容量,分别为98.5mg/g和65.6mg/g。该吸附剂合成简单,具有较高的吸附容量,为相关的科研工作者提供技术和方法参考。
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Study on the preparation of hydrotalcite and its adsorption of uranyl ions
Abstract:With the development of the nuclear industry, a large amount of uranium-containing industrial wastewater is discharged, which seriously threatens the surrounding ecological environment and human health. The adsorption method is a commonly used method for treating polluted water sources. Its core is adsorbent, but the adsorbents reported so far have problems such as high cost and low adsorption capacity. In this paper, Ni-Al was synthesized in one step by a simple urea hydrothermal method. (LDH-N) and Mg-Al (LDH-M) are used as adsorbents. The structure and morphology of the adsorbents are characterized by XRD, SEM and TEM. The adsorbents are adsorbed by DLS, EDX and FT-IR. The adsorption behavior of uranyl ions adsorbed by the uranyl ions was investigated, and the influence of contact time, adsorbent addition and pH on the adsorption capacity of uranyl ions was investigated, and the data were analyzed for adsorption kinetics, adsorption isotherms and adsorption thermodynamics. The results show that LDH-N and LDH-M have the highest saturated adsorption capacity at a temperature of 25℃, pH=7, contact time of 1h, and adsorbent addition of 10mg, which are 98.5mg/g and 65.6mg/g, respectively. The adsorbent is simple to synthesize and has high adsorption capacity, providing technical and method reference for related scientific research workers.
Keywords: Uranyl ion Hydrotalcite Adsorption method
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水滑石制备及对铀酰离子的吸附探究
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