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硅镁胶MgO·6SiO2的制备及其对亚甲基蓝的吸附

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滕绍丛, 王海增. 硅镁胶MgO·6SiO2的制备及其对亚甲基蓝的吸附[J]. 环境化学, 2014, 33(6): 985-991. doi: 10.7524/j.issn.0254-6108.2014.06.022
引用本文: 滕绍丛, 王海增. 硅镁胶MgO·6SiO2的制备及其对亚甲基蓝的吸附[J]. 环境化学, 2014, 33(6): 985-991. doi: 10.7524/j.issn.0254-6108.2014.06.022
shu
TENG Shaocong, WANG Haizeng. Preparation of MgO·6SiO2 and its adsorption for methylene blue[J]. Environmental Chemistry, 2014, 33(6): 985-991. doi: 10.7524/j.issn.0254-6108.2014.06.022
Citation: TENG Shaocong, WANG Haizeng. Preparation of MgO·6SiO2 and its adsorption for methylene blue[J]. Environmental Chemistry, 2014, 33(6): 985-991. doi: 10.7524/j.issn.0254-6108.2014.06.022
shu

硅镁胶MgO·6SiO2的制备及其对亚甲基蓝的吸附

  • 1.

    中国海洋大学化学化工学院, 青岛, 266100

  • 基金项目:

    教育部博士点专项基金（20090132110009）资助.

Preparation of MgO·6SiO2 and its adsorption for methylene blue

  • 1.

    Chemistry and Chemical Engineering, Ocean university of China, Qingdao, 266100, China

  • Fund Project:

  • 摘要: 以氯化镁和水玻璃为原料，采用水热法制备了氧化镁含量低于10%的新型硅镁胶MgO·6SiO2，讨论了体系pH值、水热时间和温度等因素对产物硅镁物质的量之比的影响，通过比表面积分析、电位滴定法对样品进行了表征，用亚甲基蓝溶液评价其吸附性能.结果表明，MgO·6SiO2的最佳制备条件为：调节pH值到9.5左右、水热12 h、水热温度110 ℃，pH为控制产物硅镁物质的量之比的决定性因素；硅镁胶MgO·6SiO2是多孔材料，比表面积为285 m2·g-1，表面零电荷点pHzpc为10.4；25℃时，对亚甲基蓝的最大吸附量可达151.52 mg·g-1，吸附过程符合Langmuir吸附模型.
    Abstract: A new magnesium silicate gel adsorbent MgO·6SiO2 was synthesized by hydrothermal method from sodium metasilicate and magnesium chloride hexahydrate. Different factors affecting the preparation, i.e. pH, reaction temperature and reaction time were studied. Surface area and pHZPC of the product were investigated by BET and potentiometric titration, respectively. The adsorption behavior for methylene blue was systematically investigated. Results indicated that the hydrothermal reaction was expected to proceed under 110℃ for 12 h and pH was the decisive factor for Si/Mg mole ratios. The surface area of MgO·6SiO2 was 285 m2·g-1 and its pHZPC occured around 10.4. At 298K, the maximum adsorption capacity for methylene blue was 151.52 mg·g-1 and the adsorption process was fitted to Langmuir isotherm.
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  • 收稿日期:  2013-10-03
滕绍丛, 王海增. 硅镁胶MgO·6SiO2的制备及其对亚甲基蓝的吸附[J]. 环境化学, 2014, 33(6): 985-991. doi: 10.7524/j.issn.0254-6108.2014.06.022
引用本文: 滕绍丛, 王海增. 硅镁胶MgO·6SiO2的制备及其对亚甲基蓝的吸附[J]. 环境化学, 2014, 33(6): 985-991. doi: 10.7524/j.issn.0254-6108.2014.06.022
shu
TENG Shaocong, WANG Haizeng. Preparation of MgO·6SiO2 and its adsorption for methylene blue[J]. Environmental Chemistry, 2014, 33(6): 985-991. doi: 10.7524/j.issn.0254-6108.2014.06.022
Citation: TENG Shaocong, WANG Haizeng. Preparation of MgO·6SiO2 and its adsorption for methylene blue[J]. Environmental Chemistry, 2014, 33(6): 985-991. doi: 10.7524/j.issn.0254-6108.2014.06.022
shu

硅镁胶MgO·6SiO2的制备及其对亚甲基蓝的吸附

  • 1. 中国海洋大学化学化工学院, 青岛, 266100
  • 收稿日期:  2013-10-03
基金项目:

教育部博士点专项基金（20090132110009）资助.

摘要: 以氯化镁和水玻璃为原料，采用水热法制备了氧化镁含量低于10%的新型硅镁胶MgO·6SiO2，讨论了体系pH值、水热时间和温度等因素对产物硅镁物质的量之比的影响，通过比表面积分析、电位滴定法对样品进行了表征，用亚甲基蓝溶液评价其吸附性能.结果表明，MgO·6SiO2的最佳制备条件为：调节pH值到9.5左右、水热12 h、水热温度110 ℃，pH为控制产物硅镁物质的量之比的决定性因素；硅镁胶MgO·6SiO2是多孔材料，比表面积为285 m2·g-1，表面零电荷点pHzpc为10.4；25℃时，对亚甲基蓝的最大吸附量可达151.52 mg·g-1，吸附过程符合Langmuir吸附模型.

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