期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 393, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.122481
关键词
Ammonia nitrogen; Natural zeolite; Adsorption; Sodium nitrate; Calcination
资金
- National Science and Technology Major Protects for Water Pollution Control and Treatment [2017ZX07201004, 21978277]
- National Natural Science Foundation of China (NSFC)
- Zhejiang Basic Public Welfare Research Program [LGF19E080009]
- National Research Foundation of Korea [21A20130011104] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Ammonium is one of the key factors responsible for the eutrophication of water bodies. The purpose of this study was to remove ammonium from water using a natural zeolite (NZ) modified with sodium nitrate (NaNO3) by impregnation and calcination. The ability of the NZ to remove ammonium from water was determined by single calcination; however, its efficiency was significantly enhanced by impregnation with a NaNO3 solution. Zeolite modified with 3.00 M NaNO3 and calcination at 673 K yielded the best ammonium removal efficiency, which was 39.88 % higher than the NZ alone. The zeolites that were regenerated over six times maintained a removal rate of 79.35-84.79 % by mixing 25.0 mg of the NZ into 50 mL of a 5.0 mg/L ammonium solution. The improved performance of the modified zeolite (q(m), 16.96 mg/g) was mainly attributed to its relatively elevated mesopore volumes and higher ion-exchange capacity that results from nitrate decomposition, oxygen release, and sodiumion exchange. The adsorption kinetics and isotherms are best described by the pseudo-first-order (PFO) and Freundlich model, respectively, and the process was endothermic. The effects of other factors, including coexisting ions, pH, and dosage, on ammonium adsorption were also determined.
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