LINQiyong,ZHANGJiale,CHENXiazhi,et al.Adsorption Performance of NaCl/High-temperature Composite Modified Zeolite for Ammonia Nitrogen[J].China Water & Wastewater,2026,42(9):66-72.
NaCl/高温复合改性沸石对氨氮的吸附性能
- Title:
- Adsorption Performance of NaCl/High-temperature Composite Modified Zeolite for Ammonia Nitrogen
- Keywords:
- modified zeolite; ammonia nitrogen; adsorption characteristics; sodium chloride; high temperature; black-odorous water body
- 摘要:
- 改性沸石因其优异的吸附能力，常被用于吸附去除水体中的氨氮。本研究通过盐酸、高温、钠盐以及钠盐/高温对天然沸石进行改性，得出NaCl/高温复合改性为最佳改性方式；然后，重点考察了NaCl/高温复合改性沸石（Na/C-Z）对氨氮的吸附性能。结果表明，经过复合改性以后，Na/C-Z对氨氮的吸附容量得到了有效提高，通过吸附等温线拟合得到最大吸附容量可达到8.64 mg/g。Na/C-Z对氨氮的吸附能力随温度的升高而提高；中性环境更利于Na/C-Z吸附氨氮；阳离子的存在会降低Na/C-Z对氨氮的吸附性能，其中K+的影响最大。Na/C-Z对氨氮的吸附主要为化学吸附，通过离子交换作用来实现；经复合改性后，沸石的孔径增大、比表面积略有降低。
- Abstract:
- Modified zeolite is commonly used for the adsorption and removal of ammonia nitrogen from water due to its excellent adsorption capacity. In this study, natural zeolite was modified using hydrochloric acid, high-temperature calcination, sodium salt, and sodium salt combined with high-temperature treatment, respectively. The results showed that NaCl/high-temperature composite modification was the most effective method. Subsequently, the adsorption performance of the NaCl/high- temperature composite modified zeolite (Na/C-Z) for ammonia nitrogen was systematically investigated. The results indicated that after composite modification, the adsorption capacity of Na/C-Z for ammonia nitrogen was effectively enhanced, with a maximum adsorption capacity of 8.64 mg/g obtained from adsorption isotherm fitting. The adsorption capacity of Na/C-Z for ammonia nitrogen increased with rising temperature; a neutral environment was more favorable for ammonia nitrogen adsorption by Na/C-Z; the presence of coexisting cations reduced the adsorption performance, with K exhibiting the most significant inhibitory effect. The adsorption of ammonia nitrogen by Na/C-Z was mainly chemisorption, primarily achieved through ion exchange. After composite modification, the pore size of the zeolite increased, while the specific surface area slightly decreased.
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