期刊
SUSTAINABLE CHEMISTRY AND PHARMACY
卷 36, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scp.2023.101279
关键词
Phosphorous adsorption; Phosphorus cycle; Modification; Large -size
Biochar plays a significant role in wastewater treatment, but faces limitations in phosphorus adsorption capacity and recycling. Metal-modified large-size biochars have shown improved phosphorus adsorption capabilities, yet challenges remain in enhancing desorption efficiency for practical fertilizer application.
Biochar finds extensive use in adsorbing phosphorus (P) from wastewater abundant in P content. Most biochars carry negative surface charges, causing electrostatic repulsion towards anions. However, as P commonly exists as anions in water, the P adsorption capacity of biochar remains limited. Moreover, conventional biochar used for P adsorption presents challenges in recycling due to its small particle size. This study presented a novel approach wherein metal-modified large-size (1-2 mm) walnut shell biochars were created using Fe, Mg, and Ca additives at varying ratios. This innovation aims to enhance P adsorption capacity and recyclability. Experimental findings revealed that unmodified biochar (BC) exhibited minimal P adsorption capacity (0.34 mg/g), while all metal-modified biochars (MBCs) demonstrated elevated P adsorption capabilities (1.06-25.60 mg/g). Among the distinct MBCs, Ca-MBCs displayed the highest P adsorption capacity (25.60 mg/g), trailed by Mg-MBCs (23.58 mg/g) and Fe-MBCs (5.99 mg/g). Furthermore, both isotherm and kinetic adsorption analyses suggested that the P adsorption mechanism for MBCs predominantly involves chemical adsorption. However, desorption studies postadsorption indicated suboptimal desorption efficiencies for P (19.16-26.07%) in MBCs, posing challenges for their application as fertilizers. Therefore, it is essential to enhance simultaneous P adsorption and desorption capabilities of biochar.
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