利用铸造粉尘合成NaA沸石及其对氨的吸附性能

Synthesis of NaA zeolite from foundry dust and its adsorption capacity of ammonia.

作者信息

Wang Mengqing, Xu Defu, Ma Hui, Li Bing, Howard Alan

机构信息

Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing 210044, China; Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Nanjing 210044, China; School of Environmental Science and Engineering, Nanjing University of Information Science &Technology, Nanjing 210044, China.

出版信息

J Environ Manage. 2023 Apr 1;331:117297. doi: 10.1016/j.jenvman.2023.117297. Epub 2023 Jan 14.

DOI:10.1016/j.jenvman.2023.117297

PMID:36646039

Abstract

Eutrophication of water bodies due to excess ammonia nitrogen (NH-N) is harmful to aquatic organisms and human health. In this study, foundry dust (FD) from foundry industry was used to synthesize NaA zeolite to use as an adsorbent to remove NH-N from wastewater. Results demonstrate that FD could be successfully synthesized to form a foundry dust-based NaA zeolite (FZA) through adjustment of the silica-alumina ratio of n (SiO)/n (AlO) at 2 at 95 °C. Specific surface area, total pore volume, and cation exchange capacity (CEC), and maximum adsorption NH-N of FZA was respectively 43.185 cm/g, 0.0364 cm/g, 212.35 mmol/100 g and 37.81 mg/g, which was 4.74, 1.54, 1.52 and 1.62 times as much as the NaA zeolite (SZA). FZA with higher adsorption NH-N capacity was related to higher specific surface area and CEC. The NH-N adsorption amount of 28.57 mg/g by FZA was obtained after the fourth regeneration, which was notably higher than that of SZA (23.27 mg/g). The desorption rate of NH-N from FZA was 87% by the fourth regeneration. FZA effectively removed NH-N from swine wastewater containing 153.32 mg/L NH-N. Results suggest that FZA could be used as absorbent to removal NH-N from wastewater.

摘要

水体中过量氨氮（NH-N）导致的富营养化对水生生物和人类健康有害。在本研究中，利用铸造工业产生的铸造粉尘（FD）合成NaA沸石，用作从废水中去除NH-N的吸附剂。结果表明，通过在95℃下将二氧化硅与氧化铝的摩尔比n（SiO₂）/n（Al₂O₃）调整为2，可以成功地将FD合成形成基于铸造粉尘的NaA沸石（FZA）。FZA的比表面积、总孔体积、阳离子交换容量（CEC）以及最大NH-N吸附量分别为43.185 cm²/g、0.0364 cm³/g、212.35 mmol/100 g和37.81 mg/g，分别是NaA沸石（SZA）的4.74倍、1.54倍、1.52倍和1.62倍。具有较高NH-N吸附能力的FZA与较高的比表面积和CEC有关。第四次再生后，FZA的NH-N吸附量为28.57 mg/g，明显高于SZA（23.27 mg/g）。第四次再生时，FZA对NH-N的解吸率为87%。FZA有效地从含有153.32 mg/L NH-N的猪废水中去除了NH-N。结果表明，FZA可作为吸附剂用于从废水中去除NH-N。