Hydrothermal Transformation of Natural Clinoptilolite Zeolite to Zeolite Na-P and Its Adsorption Property for Cd ion
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摘要:
以河北承德围场地区天然沸石为原料，对其进行水热改性制备Na-P沸石。采用X射线衍射仪、X射线光电子能谱仪、气体吸附仪、扫描电镜和能谱分析仪等对材料进行表征分析，采用Cd2+离子评价材料的重金属离子去除性能。研究碱处理浓度、水热温度和时间对天然沸石结构的影响规律，着重研究所制备Na-P沸石的组成结构特征及重金属离子去除性能。结果表明：在NaOH浓度3 mol/L、水热温度100 ℃、水热时间12 h的条件下，斜发沸石可转化为纯度较高的Na-P沸石。所得材料对Cd2+的吸附容量为35.7 mg/g，较天然沸石提升7倍。Na-P沸石性能的提升主要归功于其较低的硅铝比和较高的表面Na+含量。
Abstract:Natural clinoptilolite zeolites from Weichang region, Chengde city, Hebei province were transformed to a zeolite Na-P using hydrothermal method. The as-prepared materials were characterized and analyzed by X-ray diffraction, X-ray photoelectron spectroscopy, gas adsorption instrument, scanning electron microscope and energy spectrum analyzer. The heavy metal ions removal performance was evaluated by Cd2+ ion. The effects of alkali treatment concentration, hydrothermal temperature and time on the structure of natural zeolite were investigated. The composition, structural characteristics and heavy metal ion removal performance of the prepared zeolite Na-P materials were further studied. The results showed that clinoptilolite could be transform to zeolite Na-P with 3 mol/L NaOH solution under the conditions of hydrothermal temperature of 100 ℃ and hydrothermal time of 12 h. The adsorption capacity of the obtained material for Cd2+ was 35.7 mg/g, which was 7 times higher than that of natural zeolite. Its excellent performance was mainly due to low silicon/aluminum ratio and relative higher exchangeable Na ion content.
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Key words:
- natural clinoptilolite /
- hydrothermal treatment /
- zeolite Na-P /
- Cd2+
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图 4 天然沸石和Na-P沸石的XPS全谱(a), 表面元素含量和硅铝比(b), Si2p谱(c), Al2p谱(d), O1s谱(e)和Na1s谱(f)
Figure 4.
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