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硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (2): 653-657.

所属专题: 新型功能材料

• 新型功能材料 • 上一篇    下一篇

钴掺杂NaP分子筛合成及其吸附Pb(II)性能

陈彦广1,2, 孙杰1,2, 吴晓辉3, 张亚男1,2, 邓冀童1,2, 韩洪晶1,2, 张梅1,2, 关金双1,2   

  1. 1.东北石油大学化学化工学院,大庆 163318;
    2.黑龙江省石油与天然气化工省重点实验室,大庆 163318;
    3.南昌市卫生学校化学教研室,南昌 330000
  • 收稿日期:2020-09-21 修回日期:2020-10-21 出版日期:2021-02-15 发布日期:2021-03-10
  • 作者简介:陈彦广(1979—),男,博士,教授。主要从事催化材料设计合成及污染物资源化利用方面的研究。E-mail:ygchen79310@126.com
  • 基金资助:
    国家自然科学基金(51674089,21908021);黑龙江省杰出青年基金(JC2018002);东北石油大学青年基金(2018QNL-17)

Preparation of NaP Zeolite Doped with Cobalt and Its Adsorption Performance for Pb(II)

CHEN Yanguang1,2, SUN Jie1,2, WU Xiaohui3, ZHANG Yanan1,2, DENG Jitong1,2, HAN Hongjing1,2, ZHANG Mei1,2, GUAN Jinshuang1,2   

  1. 1. School of Chemistry and Chemical Engineering, Northeast Petroleum University, Daqing 163318, China;
    2. Heilongjiang Provincial Key Laboratory of Oil and Gas Chemical Technology, Daqing 163318, China;
    3. Department of Chemistry, Nanchang Health School, Nanchang 330000, China
  • Received:2020-09-21 Revised:2020-10-21 Online:2021-02-15 Published:2021-03-10

摘要: 以硅酸钠和偏铝酸钠为原料,通过水热合成法制备钴掺杂NaP分子筛,通过X射线衍射光谱(XRD)、扫描电子显微镜(SEM)、N2吸附-脱附等表征手段对样品的晶相、形貌和孔结构进行表征分析,并对其Pb(II)吸附性能进行评价。结果表明:与未掺杂钴的NaP分子筛相比,掺杂量为n(Al2O3)∶n(Co(NO3)2)=8∶1的Co-NaP分子筛的比表面积增大了约5倍(从26.767 m2/g增大到162.490 m2/g);其孔容约增大了约2.5倍(从0.029 cm3/g增大到0.104 cm3/g)。吸附时间为120 min,吸附温度为25 ℃,Pb(II)初始浓度为100 mg/L时,Co-NaP分子筛对Pb(II)的去除率可达98.8%,以乙二胺四乙酸二钠为再生助剂,在30 ℃下再生30 min,可使吸附后时Co-NaP分子筛完全再生,再生后的吸附剂经过3次吸附-再生循环后,Pb(II)去除率仍可达97%。

关键词: NaP分子筛, Co掺杂, 水热合成法, 合成调控, Pb(II)吸附, 再生

Abstract: A series of NaP zeolites doped with cobalt were synthesized by hydrothermal synthesis method using the sodium silicate and the sodium meta-aluminate as raw material. The crystal phase, morphology and pore structures of NaP zeolite samples were characterized by X-ray diffraction spectroscopy (XRD), scanning electron microscope (SEM), and N2 adsorption-desorption methods. Moreover, the adsorption performance of NaP zeolite doped with cobalt for Pb(II) was evaluated. The results show that the NaP zeolite doped with cobalt at n(Al2O3)∶n(Co(NO3)2)=8∶1 has a specific surface area of 162.490 m2/g, which is 5 times more than the undoped NaP zeolite (from 26.767 m2/g to 162.49 m2/g), and a pore volume of 0.104 cm3/g, which is 2.5 times more than the undoped NaP zeolite (from 0.029 cm3/g to 0.104 cm3/g). When the adsorption time is 120 min, the adsorption temperature is 25 ℃, and the initial concentration of Pb(II) is 100 mg/L, Co-NaP zeolite has a removal rate of 98.8% for Pb(II). Employing the EDTA-2Na as the regeneration regent, the adsorbed NaP zeolite is regenerated completely at 30 ℃ for 30 min. After three adsorption-regeneration cycles, Co-NaP zeolite has a better adsorption property for Pb(II), and the removal rate of Pb(II) keeps over for 97%.

Key words: NaP zeolite, Co doping, hydrothermal synthesis method, synthesis regulation, Pb(II) adsorption, regeneration

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