用硅钛酸盐快速高效清除水中低浓度铅离子

doi:10.3969/j.issn.0253-2778.2019.04.004

中国科学技术大学学报 ›› 2019, Vol. 49 ›› Issue (4): 282-289.DOI: 10.3969/j.issn.0253-2778.2019.04.004

用硅钛酸盐快速高效清除水中低浓度铅离子

赵旭东，翁汉钦，盛六四，於国兵，林铭章

1.中国科学技术大学核科学技术学院，安徽合肥 230027；2.中国科学技术大学国家同步辐射实验室，安徽合肥 230029； 3.安徽省辐射环境监督站，安徽合肥 230071；4. 中国科学院核能安全技术研究所，安徽合肥 230031

收稿日期:2018-01-28 修回日期:2018-05-08 接受日期:2018-05-08 出版日期:2019-04-30 发布日期:2018-05-08
通讯作者: 林铭章
作者简介:赵旭东，男，1991年生，硕士生.研究方向：水体除锶、铯、铅.E-mail: zhaoxd@mail.ustc.edu.cn
基金资助:
国家自然科学基金(11775214)，中国博士后科学基金(2016M592069)，安徽省自然科学基金(1708085QA21)，中央高校基本科研基金(WK2140000009)资助.

Fast and efficient removal of lead from low concentration solutions using silicotitanate

ZHAO Xudong, WENG Hanqin, SHENG Liusi, YU Guobing, LIN Mingzhang

1. School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, China; 2. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China; 3. Environmental Radiation Surveillance Center, Environmental Protection Department of Anhui, Hefei 230071, China; 4. Institute of Nuclear Energy Safety Technology, Chinese Academy of Sciences, Hefei 230031, China

Received:2018-01-28 Revised:2018-05-08 Accepted:2018-05-08 Online:2019-04-30 Published:2018-05-08

摘要/Abstract

摘要： 通过水热法合成了水合结晶硅钛酸钠（Na-CST）和25%铌取代水合结晶硅钛酸钠（Na-Nb/CST），利用X射线衍射仪（XRD）、扫描电子显微镜（SEM）、BET氮气吸附法对其进行了表征，并用这两种材料对铅开展了吸附实验.结果显示，在pH值为4.00 ~6.50时两种材料有良好的吸附效果，吸附过程在60 min内达到平衡，饱和吸附容量分别为70.1 mg·g-1和70.7 mg·g-1.两种吸附剂均表现出良好的水体除铅性能，在质量浓度为10-9kg·L-1量级的铅溶液中对铅的去除率可以达到94%以上，吸附后水中铅残留量降至3×10-9kg·L-1以下，符合世界卫生组织规定的饮用水铅含量标准.

关键词: 铅, 吸附, 10-9kg·L-1量级, 硅钛酸盐

Abstract: Sodium crystalline silicotitanate (Na-CST) and niobium substituted crystalline silicotitanate (Na-Nb/CST), which were synthesized using the hydrothermal method and characterized by X-ray diffraction (XRD), BET and scanning electron microscopy (SEM), were used to separate Pb2+ from aqueous solutions. The adsorption experiments show that their maximum adsorption ability is within pH 4.00~6.50. The adsorption process reaches equilibrium within 60 min, and the maximum adsorption quantity of Na-CST and Na-Nb/CST is 70.1 and 70.7 mg·g-1, respectively. Both materials are able to remove more than 94% of Pb2+ from water when Pb2+ concentration is at 10-9kg·L-1 level. Most interestingly, the concentration of Pb2+ could be lower than 3×10-9kg·L-1 after adsorption, much lower than the standard set by of the World Health Organization for the quality of drinking water, 1×10-8kg·L-1.

Key words: lead, adsorption, 10-9 concentration level, crystalline silicotitanate

中图分类号:

X524

赵旭东，翁汉钦，盛六四，於国兵，林铭章. 用硅钛酸盐快速高效清除水中低浓度铅离子[J]. 中国科学技术大学学报, 2019, 49(4): 282-289.

ZHAO Xudong, WENG Hanqin, SHENG Liusi, YU Guobing, LIN Mingzhang. Fast and efficient removal of lead from low concentration solutions using silicotitanate[J]. Journal of University of Science and Technology of China, 2019, 49(4): 282-289.

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用硅钛酸盐快速高效清除水中低浓度铅离子

Fast and efficient removal of lead from low concentration solutions using silicotitanate

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