高活性氧化镁的制备及其对铅离子吸附性能

摘要

以工业氢氧化镁为原料，采用水热-煅烧法和碳化-煅烧法制备氧化镁。前者将原料氢氧化镁通过水热制备六角片状氢氧化镁，再在适当温度下煅烧氢氧化镁得到活性氧化镁；后者是先用CO₂将Mg（OH）₂转化成片层花状碱式碳酸镁或三水碳酸镁晶须作为前驱体，通过煅烧得到高活性的氧化镁。研究了前驱体、煅烧温度和煅烧时间等条件对MgO活性的影响，结果表明，以MgCO₃·3H₂O晶须制备的MgO表现出优异的活性，其柠檬酸值为8.45 s，吸碘值为262.14 mg·g^-1。研究了制备的活性MgO对Pb²⁺的吸附性能，显示出其对Pb²⁺具有良好的吸附作用，饱和吸附量达到364 mg·g^-1，其过程符合Langmuir吸附模型。

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	王素平
	李祥高
	王世荣
	肖殷

关键词：氧化镁活性煅烧吸附铅离子

Abstract：

The magnesium oxide was prepared by the hydrothermal treatment-thermal decomposition method and the carbonation-thermal decomposition method using the normal magnesium hydroxide as raw material. The former method was to obtain magnesium oxide by calcining the hexagonal magnesium hydroxide precursor, which was prepared by hydrothermal treatment me-thod. The later method was to obtain high active magnesium oxide by calcining flower-like hy-dromagnesite or nesquehonite whisker, which was prepared by the carbonation method. The ef-fects of calcining temperature and soaking time on the activity of magnesium oxide were studied. The results showed that the high active MgO was prepared by nesquehonite whisker precursor, which had the CAA value of 8.45 s, iodine adsorption value of 264.14 mg·g^-1. The adsorption performances of MgO have been also studied in lead solution. The results of adsorption were conformed to Langmuir model, and maximum adsorption was 364 mg·g^-1.

Keywords： magnesium oxide； activity； calcination； adsorption； Pb²⁺

Received 2015-05-18;

Fund:

国家高技术研究发展计划（863计划，2013AA032003）；天津市创新平台（14TXGCCX00017）。

Corresponding Authors: 李祥高,E-mail:lixianggao@tju.edu.cn. Email: lixianggao@tju.edu.cn

About author: 王素平(1989-),女,硕士研究生,现从事无机功能材料方面的研究.

引用本文:

王素平, 李祥高, 王世荣, 肖殷.高活性氧化镁的制备及其对铅离子吸附性能[J]. 化学工业与工程, 2017,34(5): 1-10

Wang Suping, Li Xianggao, Wang Shirong, Xiao Yin.Synthesis and Adsorption Properties of High Active MgO[J]. Chemcial Industry and Engineering, 2017,34(5): 1-10

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