https://ogma.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:52614 La-Euchar >goethite >HDPB-Z >HDPC-M. Birnessite exhibited great affinity for As and drastically reduced As extractability by more than 90% in all single extractions. The results revealed that HDPC-M, HDPB-Z, La-Euchar, birnessite, and goethite are promising immobilizing agents for in situ stabilization of As in terrestrial environments.]]> Wed 18 Oct 2023 13:47:13 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:52545 Tue 17 Oct 2023 14:51:51 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:38311 8H₄K₂O₁₂Sb₂, Sb₂S₃, Sb₂O₃ and Sb₂O₃ nanoparticles) were evaluated during 120 days ageing time. A black soil (BS) with approximately 12% organic matter (OM) and a red soil (RS) with less than 1% OM were amended with 1000 mg Sb kg⁻¹ of different Sb compounds and subjected to single extractions with distilled (DI) water, 2M HNO₃, Simplified Bioaccessibility Extraction Test (SBET) and a modified Community Bureau of Reference (BCR) sequential extraction method. The results revealed that there are substantial variations in dissolution rate of various Sb sources, depending upon soil type and Sb compound. The amounts of DI water extractability of Sb during the incubation time varied between <1% and 2%, whereas HNO₃ extractable fractions and Sb bioaccessibility at the end of ageing time ranged between about 1%-3% and <1%–9% of the total Sb, with maximum bioaccessibility observed in BS contaminated with C₈H₄K₂O₁₂Sb₂. The residual and labile fractions accounted for 77–93% and 0.1–4% of the total Sb, respectively, indicating that Sb is mostly associated with recalcitrant fractions of the soils. The results of single and sequential extraction studies revealed that source of Sb, ageing time and soil properties can greatly affect the bioavailability of Sb in soils. The findings of this research provide a deeper understanding of the potential risks associated with Sb compounds and highlights the role of site-specific considerations for improving the robustness of toxicity guidelines and long-term management of Sb contaminated sites.]]> Mon 29 Jan 2024 18:01:32 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36981 Mon 27 Jul 2020 10:07:42 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39222 +-M) and hexadecylpyridinium bromide modified zeolite (HDPy⁺-Z) were used to measure Sb(III) uptake from solutions containing 0.5–2.5 mM antimonite. Adsorption isotherms of antimonite were studied using the Langmuir and Freundlich equations. Adsorption kinetics were investigated using pseudo-first-order, pseudo-second-order, Elovich and intra-particle diffusion models. The results of X-ray diffraction showed a large interlayer expansion for HDPy⁺-M, whereas the X-ray patterns of HDPy⁺-Z remained unchanged. Uptake of Sb(III) by both HDPy⁺-M and HDPy⁺-Z could be fitted well to the Langmuir isotherm, while the kinetics of adsorption could be described well using the pseudo-second-order model. Maximum adsorption capacities for Sb(III) uptake by HDPy⁺-M and HDPy⁺-Z were calculated to be 108.7 and 61.34 mg g⁻¹, respectively. The results of the kinetic studies revealed that Sb(III) adsorption to HDPy⁺-Z was found to be quite fast and the reaction reached equilibrium in 8 h, whereas for HDPy⁺-M equilibration was attained within 24 h. The adsorption of antimonite onto both HDPy⁺-M and HDPy⁺-Z was found to be selective in the presence of Cl⁻¹ and SO4⁻² competitive anions. Considering the high affinity for Sb(III) uptake from solutions containing high concentrations of antimonite, both HDPy⁺-M and HDPy⁺-Z could be used as promising adsorbents for environmental applications.]]> Fri 27 May 2022 11:44:31 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36535 Fri 16 Feb 2024 15:39:29 AEDT ]]>