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硅酸盐通报 ›› 2016, Vol. 35 ›› Issue (9): 2930-2934.

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粉煤灰制备高纯度X型沸石及其对含铅废水处理的研究

亢玉红;马亚军;李健;王爱民;闫龙;郝华睿   

  1. 榆林学院化学与化工学院,陕西省低变质煤洁净利用重点实验室,榆林 719000
  • 出版日期:2016-09-15 发布日期:2021-01-18
  • 基金资助:
    陕西省教育厅项目(16JK1891);陕西省能源化工过程强化重点实验室项目(SXECPI201504);陕西省低变质煤洁净利用重点实验室项目(2014DBM-003,2014DBM-016)

Removal of Pb2+from Waste Water with High Purity Zeolite X Synthesized by Coal Fly Ash

KANG Yu-hong;MA Ya-jun;LI Jian;WANG Ai-min;YAN Long;HAO Hua-rui   

  • Online:2016-09-15 Published:2021-01-18

摘要: 采用经碱熔融-离心提取处理的粉煤灰为原料,经水热反应法研究合成高纯度X型沸石的过程,探讨了碱灰比、焙烧温度对硅铝熔出量的影响,研究了碱度、陈化时间、晶化时间与硅铝比对合成的影响以及其对含Pb2+废水的吸附性能。结果表明:碱灰比为2.3∶1,焙烧温度为680℃时可获得最佳的硅铝熔出量;当SiO2/Na2 O=1(摩尔比),SiO2/Al2O3=3.5(摩尔比),陈化时间为5 h,晶化时间为16 h时可获得高纯度X型沸石。合成沸石表现出对含Pb2+废水较强的吸附能力,在投加0.23 g/100 mL含Pb2+500 mg/L溶液中,调节pH值为5,常温下30 min,Pb2+去除率可达99.6%;吸附容量达到了216.8 mg/g。

关键词: 粉煤灰;高纯度X型沸石;铅离子;废水处理

Abstract: High purity zeolite X was synthesized by hydrothermal method with coal fly ash pretreated by alkaline fusion and centrifugal extraction , the effects of alkali/ash and roasting temperature on the quantity of silicon aluminum dissolution were discussed , the influences of alkalinity , aging time, crystallization time and Si/Al ratio on synthesis zeolite were investigated and the adsorption performance of Pb2+-containing waste water has been researched .The results showed that the highest silicon aluminum dissolution quantity obtained at 680 ℃, alkali/ash =2 .3 and the high purity zeolite X synthesized at SiO2/Na2O=1, SiO2/Al2O3 =3.5, 5 h aging and 16 h crystallization.The obtained zeolite X showed fast adsorption to Pb 2+-containing waste water .The removal rate of Pb 2+can be up to 99 .6%for 30 min at the room temperature in the condition of pH =5, adding 0.23 g/100 mL in 500 mg/L Pb2+solution. The adsorption capacity of zeolite X was 216.8 mg/g.

Key words: coal fly ash;high purity zeolite X;lead ion;wastewater treatment

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