摘要：

以电厂粉煤灰为原料，在传统碱熔-水热法中引入脱硅工艺制备粉煤灰基方钠石，运用XRD和SEM对其进行物相和形貌表征，并通过研究不同因素条件下Pb²⁺的吸附行为来考察Pb²⁺在粉煤灰基方钠石上的吸附特性。结果表明：在碱度4.5 mol/L、晶化时间12 h、晶化温度100 ℃条件下能够合成出较高纯度的粉煤灰基方钠石；合成的方钠石相比原状粉煤灰吸附能力显著提高，对Pb²⁺具有显著的去除效果，可作为重金属处置的高效吸附剂。

关键词: 粉煤灰, 方钠石, Pb²⁺, 吸附

Abstract:

Using coal fly ash as raw materials,the coal fly ash-based sodalite has been prepared by introducing desilication process to traditional alkali fusion-hydrothermal method. Its phase and morphology are characterized by X ray diffraction and scanning electron microscope. In addition,the adsorption characteristics of coal fly ash-based sodalite for Pb²⁺ are investigated through studying the adsorption behavior of Pb²⁺ under conditions of different factors. The results show that the coal fly ash-based sodalite with high purity and high crystalline phase can be synthesized under the following conditions: its basicity is 4.5 mol/L,crystallization time 12 h,and crystallization temperature 100 ℃. Compared with the coal fly ash in original state,the adsorption capacity of synthesized sodalite is obviously improved,and has remarkable removing effect on Pb²⁺,being able to be used as a kind of efficient adsorbent for treating heavy metals.

Key words: coal fly ash, sodalite, lead ion, adsorption

中图分类号: 

• X703