MgFe-LDH@biochars for removing ammonia nitrogen and phosphorus from biogas slurry: Synthesis routes, composite performance, and adsorption mechanisms

Haohao BIAN, Minyan WANG, Jialin HAN, Xiaopiao HU, Honglei XIA, Lei WANG, Chaochu FANG, Cheng SHEN, Yu Bon MAN, Ming Hung WONG, Shengdao SHAN, Jin ZHANG

Research output: Contribution to journalArticlespeer-review

11 Citations (Scopus)

Abstract

Layered double hydroxide-biochar composites (LDH@BCs) have been developed for ammonia nitrogen (AN) and phosphorus (P) removal from wastewater. 

Improvement of LDH@BCs was limited due to the lack of comparative evaluation based on LDH@BCs characteristics and synthetic methods and information on the adsorption properties of LDH@BCs for N and P from natural wastewater. In this study, MgFe-LDH@BCs were synthesized by three different co-precipitation procedures. The differences in physicochemical and morphological properties were compared. They were then employed to remove AN and P from biogas slurry. The adsorption performance of the three MgFe-LDH@BCs was compared and evaluated. Different synthesis procedures can significantly affect the physicochemical and morphological characteristics of MgFe-LDH@BCs. The LDH@BC composite fabricated through a novel method (labeled ‘MgFe-LDH@BC1’) has the largest specific surface area, Mg and Fe content, and excellent magnetic response performance. Moreover, the composite has the best adsorption property of AN and P from biogas slurry (30.0% and 81.8%, respectively). The main reaction mechanisms include memory effect, ion exchange, and co-precipitation. Applying 2% MgFe-LDH@BC1 saturated with AN and P adsorption from biogas slurry as a fertilizer substitute can substantially improve soil fertility and increase plant production by 139.3%. These results indicate that the facile LDH@BC synthesis method is an effective method to overcome the shortcomings of LDH@BC in practical application, and provide a basis for further exploration of the potential application of biochar based fertilizers in agriculture. Copyright © 2023 Elsevier Ltd. All rights reserved.

Original languageEnglish
Article number138333
JournalChemosphere
Volume324
Early online dateMar 2023
DOIs
Publication statusPublished - May 2023

Citation

Bian, H., Wang, M., Han, J., Hu, X., Xia, H., Wang, L., . . . Zhang, J. (2023). MgFe-LDH@biochars for removing ammonia nitrogen and phosphorus from biogas slurry: Synthesis routes, composite performance, and adsorption mechanisms. Chemosphere, 324. Retrieved from https://doi.org/10.1016/j.chemosphere.2023.138333

Keywords

  • Metal-biochar composites
  • LDH fabrication methods
  • Wastewater treatment
  • Resource recovery
  • Controlled release fertilizer

Fingerprint

Dive into the research topics of 'MgFe-LDH@biochars for removing ammonia nitrogen and phosphorus from biogas slurry: Synthesis routes, composite performance, and adsorption mechanisms'. Together they form a unique fingerprint.