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铝盐复合改性凹凸棒石及其除氟性能

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张彦艳, 杨琰琰, 李学德. 铝盐复合改性凹凸棒石及其除氟性能[J]. 环境工程学报, 2016, 10(9): 4861-4866. doi: 10.12030/j.cjee.201403255
引用本文: 张彦艳, 杨琰琰, 李学德. 铝盐复合改性凹凸棒石及其除氟性能[J]. 环境工程学报, 2016, 10(9): 4861-4866. doi: 10.12030/j.cjee.201403255
shu
ZHANG Yanyan, YANG Yanyan, LI Xuede. Attapulgite modified with aluminum salts and defluorination characteristics[J]. Chinese Journal of Environmental Engineering, 2016, 10(9): 4861-4866. doi: 10.12030/j.cjee.201403255
Citation: ZHANG Yanyan, YANG Yanyan, LI Xuede. Attapulgite modified with aluminum salts and defluorination characteristics[J]. Chinese Journal of Environmental Engineering, 2016, 10(9): 4861-4866. doi: 10.12030/j.cjee.201403255
shu

铝盐复合改性凹凸棒石及其除氟性能

  • 1.

    安徽农业大学资源与环境学院, 农业部合肥农业环境科学观测实验站, 合肥 230036

  • 基金项目:

    国家高技术研究发展计划（863）项目（2012AA62605）

  • 中图分类号: X703.5

Attapulgite modified with aluminum salts and defluorination characteristics

  • 1.

    Hefei Scientific Observing and Experimental Station of Agro-Environment, Ministry of Agriculture, School of Resource and Environment, Anhui Agricultural University, Hefei 230036, China

  • Fund Project:

  • 摘要: 通过静态吸附实验，研究了Al2（SO4）3、AlCl3、Al（NO3）3 3种铝盐对凹凸棒石的复合改性及其除氟效果。复合改性的最优条件为Al2（SO4）3 浓度0.05 mol·L-1、浸泡时间2 h、固液比1：3，AlCl3浓度0.4 mol·L-1、浸泡时间5 h、固液比1：2，Al（NO3）3浓度0.2 mol·L-1、浸泡时间6 h、固液比1：2。复合改性的凹凸棒石吸附容量达到1.317 mg·g-1，是改性前的13.9倍，吸附容量显著提高。复合改性的凹凸棒石对水中氟的吸附动力学符合拟二级动力学模型，吸附等温线更符合Langmuir等温吸附规律。吸附最佳pH为7，改性后的凹凸棒石表面更疏松粗糙，孔穴和孔道增多增大，但晶体结构未变。
    Abstract: This study investigated fluoride ion removal by adsorption on attapulgite modified with AlCl3, Al(NO3)3, and Al2(SO4)3 by a series of static adsorption experiments. The optimum modification conditions were as follows:attapulgite was soaked in 0.05 mol·L-1 Al2(SO4)3 solution for 2 h at a solid/solution ratio of 1:3, and subsequently soaked in 0.4 mol·L-1 AlCl3 solution for 5 h at a solid/solution ratio of 1:2, and then soaked in 0.2 mol·L-1 Al(NO3)3 solution for 6 h at a solid/solution ratio of 1:2. The maximum sorption capacity of the modified attapulgite for fluoride reached 1.317 mg·g-1, which was 13.9 times that of unmodified attapulgite, indicating that the adsorption capacity of the modified attapulgite significantly improved. Adsorption of fluoride from water by the modified attapulgite was well described by the pseudo-second-order kinetic model. The adsorption kinetics conformed to the Langmuir model. The optimal pH for fluoride adsorption was 7. The surface of the modified attapulgite was looser and rougher than that of the unmodified congener; the pore size also increased, but the crystal texture remained unchanged.
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  • 收稿日期:  2015-04-12
  • 刊出日期:  2016-09-10
张彦艳, 杨琰琰, 李学德. 铝盐复合改性凹凸棒石及其除氟性能[J]. 环境工程学报, 2016, 10(9): 4861-4866. doi: 10.12030/j.cjee.201403255
引用本文: 张彦艳, 杨琰琰, 李学德. 铝盐复合改性凹凸棒石及其除氟性能[J]. 环境工程学报, 2016, 10(9): 4861-4866. doi: 10.12030/j.cjee.201403255
shu
ZHANG Yanyan, YANG Yanyan, LI Xuede. Attapulgite modified with aluminum salts and defluorination characteristics[J]. Chinese Journal of Environmental Engineering, 2016, 10(9): 4861-4866. doi: 10.12030/j.cjee.201403255
Citation: ZHANG Yanyan, YANG Yanyan, LI Xuede. Attapulgite modified with aluminum salts and defluorination characteristics[J]. Chinese Journal of Environmental Engineering, 2016, 10(9): 4861-4866. doi: 10.12030/j.cjee.201403255
shu

铝盐复合改性凹凸棒石及其除氟性能

  • 1. 安徽农业大学资源与环境学院, 农业部合肥农业环境科学观测实验站, 合肥 230036
  • 收稿日期:  2015-04-12
基金项目:

国家高技术研究发展计划（863）项目（2012AA62605）

摘要: 通过静态吸附实验，研究了Al2（SO4）3、AlCl3、Al（NO3）3 3种铝盐对凹凸棒石的复合改性及其除氟效果。复合改性的最优条件为Al2（SO4）3 浓度0.05 mol·L-1、浸泡时间2 h、固液比1：3，AlCl3浓度0.4 mol·L-1、浸泡时间5 h、固液比1：2，Al（NO3）3浓度0.2 mol·L-1、浸泡时间6 h、固液比1：2。复合改性的凹凸棒石吸附容量达到1.317 mg·g-1，是改性前的13.9倍，吸附容量显著提高。复合改性的凹凸棒石对水中氟的吸附动力学符合拟二级动力学模型，吸附等温线更符合Langmuir等温吸附规律。吸附最佳pH为7，改性后的凹凸棒石表面更疏松粗糙，孔穴和孔道增多增大，但晶体结构未变。

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