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:46733 0.90) and Langmuir isotherm models (R2 > 0.97) quite well described the adsorption of Sb(V) on Y-based MOFs, revealed that the uptake of Sb(V) on Y-based MOFs were followed by a monolayer chemical adsorption process. The maximum adsorption capacities of Sb(V) calculated from the Langmuir model were 161.3 and 151.5 mg/g for MOF-Y and NH2-MOF-Y, respectively. The Y-based MOFs exhibited strong water and chemical stability, it could be utilized for removal Sb(V) under wide pH range and various concentration of Sb(V). The spent adsorbents could be successfully regenerated by NaCl (5 mol/L) solution for further utilization without damaging the crystal structure of Y-based MOFs. X-ray photoelectron spectroscopy (XPS) and energy dispersive spectroscopy (EDS) results revealed that the formation of inner-sphere Y-O-Sb complex between Y-oxo-clusters and Sb(V) was the dominant adsorption mechanism, while the co-precipitation of Y3+ and Sb(V) was also partially contributed the Sb(V) adsorption. High stability together with high Sb(V) adsorption capacity and excellent recyclability endow the Y-based MOFs as promising adsorbents for Sb(V) removal from wastewater.]]> Wed 22 Mar 2023 18:38:30 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:38847 −, SO₄²⁻, NO₃⁻, SiO₃²⁻ and PO₄³⁻. The adsorption affinity increased from 0.0047 to 0.0915 and 0.0053 to 0.4091 for As(V) and Sb(V), respectively. X-ray photoelectron spectroscopic investigation demonstrated a reductive conversion of As(V) to As(III) during the adsorption process with sulfide-modified α-FeOOH, but with no obvious variation of Sb(V) speciation. While the removal mechanism for As(V) was reduction followed by adsorption via hydroxyl groups, mainly surface complexation was involved in the removal of Sb(V). This study presented a simple strategy to enhance the adsorption capacity and adsorption affinity of α-FeOOH toward As(V)/Sb(V) via sulfide-modification.]]> Wed 16 Feb 2022 10:55:29 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39613 Wed 10 Aug 2022 11:41:40 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47158 Wed 07 Feb 2024 18:00:55 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47163 Wed 07 Feb 2024 16:38:25 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:35489 Thu 28 Oct 2021 13:04:42 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:48135 Thu 02 Mar 2023 16:16:31 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:30097 Sat 24 Mar 2018 07:37:55 AEDT ]]>