Journal
CHEMOSPHERE
Volume 324, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2023.138333
Keywords
Metal-biochar composites; LDH fabrication methods; Wastewater treatment; Resource recovery; Controlled release fertilizer
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In this study, MgFe-LDH@BCs were synthesized using three different co-precipitation procedures and the differences in physicochemical and morphological properties were compared. The MgFe-LDH@BC composite fabricated through a novel method (MgFe-LDH@BC1) showed the highest specific surface area, Mg and Fe content, and excellent magnetic response performance. It also exhibited the best adsorption property for AN and P from biogas slurry. Applying MgFe-LDH@BC1 as a fertilizer substitute can significantly improve soil fertility and increase plant production.
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 char-acteristics 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 pro-cedures. 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.
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