https://ogma.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:38044 2PO₄) (10 %, w/w) at 300 ℃, 500 ℃ and 700 ℃ to evaluate their potential lead [Pb(II)] adsorption. Effects of pH, contact time, and initial Pb(II) concentration on the Pb(II) adsorption capacity of the biochars were investigated. The physico-chemical, morphological, porous structure, crystallinity and spectroscopic characteristics of pre- and post-Pb-adsorbed biochars were analyzed to unravel the Pb(II) adsorption mechanism. Results showed that KH₂PO₄ reacted with biomass carbon to form stable C–P and/or C–O–P groups in BCP, and increased carbon retention and aromaticity of BCP. However, the addition of KH₂PO₄ led to an adverse effect on porous structure, e.g. surface area of biochars produced at 300 ℃, 500 ℃ and 700 ℃ were decreased by 41.53 %, 80.32 %, and 59.74 %, respectively. Adsorption experiments displayed that BCP produced at 300 ℃ exhibited the highest Pb(II) adsorption capacity (q_max = 154.7 mg g⁻¹), which was almost 6 times higher than the pristine biochar (q_max = 24.3 mg g⁻¹). Potassium polymetaphosphate [(KPO₃)_n] particles were attached on the surface of BCP, which facilitated the precipitation of Pb(II) to form [Pb(PO_3)2]n, Pb5(PO₄₎₃OH and PbHPO₄. This study thus demonstrated the effect of pyrolysis temperature on the enhancing removal capability of P-modified biochar for Pb(II) from aqueous solutions.]]> Wed 28 Jul 2021 15:18:58 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:52720 Mon 23 Oct 2023 16:25:51 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:46864 Mon 05 Dec 2022 08:29:59 AEDT ]]>