AI Article Synopsis
- A new nitrogen-doped, iron-rich biochar (N-CB) showed a significantly higher capacity to adsorb phosphate (P), achieving 314.52 mg/g compared to 104.04 mg/g for regular biochar (CB).
- The adsorption mechanism was complex, primarily involving multilayer coverage and was influenced by factors like Fe-P precipitation and the presence of active Fe-N sites.
- The effective preparation technique and the material's recyclability make N-CB a promising option for removing phosphate from waste, such as pickling wastewater.
Article Abstract
A one-step method of preparation using a novel nitrogen (N)-doped Fe-rich biochar (N-CB) resulted in a maximum adsorption capacity (314.52 mg/g) compared with Fe-rich biochar (CB, 104.044 mg/g). It can be used to adsorb phosphate (P) efficiently. Additionally, the adsorption kinetics, isotherms, and thermodynamics indicated that the adsorption of P onto N-CB was mainly mediated via multilayer coverage, endothermic, spontaneous, and physical mechanisms. The main adsorption mechanisms include Fe-P precipitation, FeOP bonding, and electronic effect. Further, the highly active Fe-N sites and graphitic N induced by N doping were the dominant driving force underlying enhanced P adsorption. Active Fe-N sites resulted in a positively-charged carbon structure and P absorption via electrostatic effect. Based on the simple method of pyrolysis, N-CB can be used in P removal from pickling wastewater with excellent adsorption capacity and remarkable recyclability.
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| http://dx.doi.org/10.1016/j.biortech.2022.128263 | DOI Listing |
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