Abstract
The performance, mechanisms, and effects of various coexisting ions on phosphorus (P) adsorptive capture in biogas slurry using MgO-doped biochar (MBC) were investigated. The results revealed that in comparison to the pristine biochar, the introduction of MgO significantly improved the P adsorptive capture feasibility of MBC. In addition, the process of P capture by MBC was not affected by the initial pH of the solution. The process of P capture could reach equilibrium within 120 min and be simulated using both the pseudo-first-order and the pseudo-second-order kinetic models. In addition, the highest P capture capacity calculated from the Langmuir isotherm model was approximately 129.35 mg/g. The coexisting of cations including NH4+, Ca2+, Cu2+, Cd2+, Pb2+, Zn2+, and Cr3+ in higher concentrations of promoted P adsorptive capture through precipitation and ionic atmosphere effects. The presence of coexisting ions including SO42−, HCO3−, and fulvic acid (FA) had a certain inhibitory effect on the P adsorptive capture through competitive adsorption with phosphate. The existence of monovalent ions such as K+, Na+, Cl−, and NO3− had no significant effect on P adsorptive capture. The adsorptive capture of P by MBC was affected by various processes including electrostatic attraction and surface complexation, and the presence of different coexisting substances had different impacts on the P adsorption. Adding to these, the P in the biogas slurry was completely adsorbed by the MBC during the experiment, indicating that MBC is a promising composite in the engineering application for the capture of P from wastewater.
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We sincerely thank all individuals who volunteered to participate in this study.
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The research work was funded by the National Natural Science Foundation of China (32172679) and the National College Students Innovation and Entrepreneurship Training Programs, China (2021).
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Yimeng Li: investigation, data curation, writing original draft. Muhammad Azeem: investigation, editing and writing original draft. Yuan Luo: investigation, writing original draft. Yaru Peng: investigation, writing original draft. Chuchu Feng: investigation and data curation. Ronghua Li: methodology, conceptualization, supervision, review and editing. Jin Peng: methodology and data curation. Lan Zhang: review and editing. Hailong Wang: review and editing. Zengqiang Zhang: review and editing.
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Li, Y., Azeem, M., Luo, Y. et al. Phosphate capture from biogas slurry with magnesium-doped biochar composite derived from Lycium chinensis branch filings: performance, mechanism, and effect of coexisting ions. Environ Sci Pollut Res 29, 84873–84885 (2022). https://doi.org/10.1007/s11356-022-21625-9
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DOI: https://doi.org/10.1007/s11356-022-21625-9