Bio-assembled MgO-coated tea waste biochar efficiently decontaminates phosphate from water and kitchen waste fermentation liquid
Chuchu Feng , Lan Zhang , Xiu Zhang , Jingyu Li , Yimeng Li , Yaru Peng , Yuan Luo , Ronghua Li , Bin Gao , Mohamed A. Hamouda , Ken Smith , Esmat F. Ali , Sang Soo Lee , Zengqiang Zhang , Jörg Rinklebe , Sabry M. Shaheen
Biochar ›› 2023, Vol. 5 ›› Issue (1)
Bio-assembled MgO-coated tea waste biochar efficiently decontaminates phosphate from water and kitchen waste fermentation liquid
Crystal morphology of metal oxides in engineered metal-biochar composites governs the removal of phosphorus (P) from aqueous solutions. Up to our best knowledge, preparation of bio-assembled MgO-coated biochar and its application for the removal of P from solutions and kitchen waste fermentation liquids have not yet been studied. Therefore, in this study, a needle-like MgO particle coated tea waste biochar composite (MTC) was prepared through a novel biological assembly and template elimination process. The produced MTC was used as an adsorbent for removing P from a synthetic solution and real kitchen waste fermentation liquid. The maximum P sorption capacities of the MTC, deduced from the Langmuir model, were 58.80 mg g−1 from the solution at pH 7 and 192.8 mg g−1 from the fermentation liquid at pH 9. The increase of ionic strength (0–0.1 mol L−1 NaNO3) reduced P removal efficiency from 98.53% to 93.01% in the synthetic solution but had no significant impact on P removal from the fermentation liquid. Precipitation of MgHPO4 and Mg(H2PO4)2 (76.5%), ligand exchange (18.0%), and electrostatic attraction (5.5%) were the potential mechanisms for P sorption from the synthetic solution, while struvite formation (57.6%) and ligand exchange (42.2%) governed the sorption of P from the kitchen waste fermentation liquid. Compared to previously reported MgO-biochar composites, MTC had a lower P sorption capacity in phosphate solution but a higher P sorption capacity in fermentation liquid. Therefore, the studied MTC could be used as an effective candidate for the removal of P from aqueous environments, and especially from the fermentation liquids. In the future, it will be necessary to systematically compare the performance of metal-biochar composites with different metal oxide crystal morphology for P removal from different types of wastewater.
| • | Bio-assembled MgO-coated biochar composite (MTC) was prepared and used for P sorption |
| • | MTC removed 58.8 mg P g−1 from P solution and 192.8 mg P g−1 from fermentation liquid |
| • | Precipitation and ligand exchange governed P sorption in solution |
| • | Struvite formation and ligand exchange controlled P sorption in fermentation liquid |
| • | MTC can be effectively used for P removal from the fermentation liquids |
Innovative Research Group Project of the National Natural Science Foundation of China(32172679)
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