Next Article in Journal
Spatially Distributed Overstory and Understory Leaf Area Index Estimated from Forest Inventory Data
Next Article in Special Issue
Chlorine vs. Sodium Chloride Regeneration of Zeolite Column for Ammonium Removal from an Explosives Impacted Mining Wastewater
Previous Article in Journal
CME-YOLOv5: An Efficient Object Detection Network for Densely Spaced Fish and Small Targets
Previous Article in Special Issue
Adsorption of Tannic Acid and Macromolecular Humic/Fulvic Acid onto Polystyrene Microplastics: A Comparison Study
 
 
Article

Adsorption Mechanism of High-Concentration Ammonium by Chinese Natural Zeolite with Experimental Optimization and Theoretical Computation

1
School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
2
Xi’an Aeronautical Polytechnic Institute, Xi’an 710089, China
*
Author to whom correspondence should be addressed.
Academic Editor: Wei Wei
Water 2022, 14(15), 2413; https://doi.org/10.3390/w14152413
Received: 28 June 2022 / Revised: 27 July 2022 / Accepted: 27 July 2022 / Published: 4 August 2022
Natural zeolite, as an abundant aluminosilicate mineral with a hierarchically porous structure, has a strong affinity to ammonium in solutions. Adsorption mechanism of high-concentration ammonium (1000~4000 mg-N/L) in an aqueous solution without pH adjustment onto Chinese natural zeolite with the dosage of 5 g/L was revealed by the strategy of experimental optimization integrated with Molecular Dynamics (MD) simulation, and found the maximum ammonium adsorption capacity was 26.94 mg/g. The adsorption kinetics and isotherm analysis showed that this adsorption process fitted better with descriptions of the pseudo-second-order kinetics and Freundlich model. The theoretical calculations and infrared-spectrum characterization results verified the existence of hydrogen bonds and chemisorption. Therefore, the adsorption mechanism by natural zeolites of high-concentration NH4+ is defined as a process under the joint influence of multiple effects, which is mainly promoted by the synergy of the ion exchange process, electrostatic attraction, and chemisorption. Meanwhile, the hydrogen bond also plays an auxiliary role in this efficient adsorption. This study presents important theoretical significance for enriching the mechanism of zeolites adsorbing NH4+ from water, and provides reference and theoretical guidance for further exploring the potential application of natural zeolites. View Full-Text
Keywords: adsorption mechanism; ammonium; natural zeolite; ion-exchange; molecular dynamics simulation; physisorption; chemisorption adsorption mechanism; ammonium; natural zeolite; ion-exchange; molecular dynamics simulation; physisorption; chemisorption
Show Figures

Figure 1

MDPI and ACS Style

Liu, P.; Zhang, A.; Liu, Y.; Liu, Z.; Liu, X.; Yang, L.; Yang, Z. Adsorption Mechanism of High-Concentration Ammonium by Chinese Natural Zeolite with Experimental Optimization and Theoretical Computation. Water 2022, 14, 2413. https://doi.org/10.3390/w14152413

AMA Style

Liu P, Zhang A, Liu Y, Liu Z, Liu X, Yang L, Yang Z. Adsorption Mechanism of High-Concentration Ammonium by Chinese Natural Zeolite with Experimental Optimization and Theoretical Computation. Water. 2022; 14(15):2413. https://doi.org/10.3390/w14152413

Chicago/Turabian Style

Liu, Pan, Aining Zhang, Yongjun Liu, Zhe Liu, Xingshe Liu, Lu Yang, and Zhuangzhuang Yang. 2022. "Adsorption Mechanism of High-Concentration Ammonium by Chinese Natural Zeolite with Experimental Optimization and Theoretical Computation" Water 14, no. 15: 2413. https://doi.org/10.3390/w14152413

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop