https://ogma.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 Mechanistic study of selective absorption of NO in flue gas using EG-TBAB deep eutectic solvents https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47623 2 concentration in the flue gas on denitrification performances of EG-TBAB DESs have been investigated. The highest denitrification efficiency and capacity were achieved using EG to TBAB molar ratio of 50:1 at an operation temperature of 50 °C. The O2 partial pressure in the flue gas showed no noticeable effects on NO absorption in EG-TBAB DESs. EG-TBAB DESs maintain high denitrification stability after five absorption–desorption cycles. The calculated absorption equilibrium constant (K0) and Henry’s law constant (H) showed that EG-TBAB DESs exhibited high absorption capacity for NO molecules, indicating that they are applicable in industrial denitrification processes. The kinetics analysis of NO absorption in EG-TBAB DESs indicated that EG-TBAB DESs could effectively absorb NO and the absorption of NO was strongly influenced by mass transfer.]]> Tue 24 Jan 2023 13:55:42 AEDT ]]> Antimony(V) Incorporation into Schwertmannite: Critical Insights on Antimony Retention in Acidic Environments https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:51642 Tue 12 Sep 2023 20:16:38 AEST ]]> Sorption of PFOS in 114 well-characterized tropical and temperate soils: application of multivariate and artificial neural network analyses https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39790 d) ranged from 5 to 229 mL/g (median: 28 mL/g), with 63% of the Fijian soils and 35% of the Australian soils showing Kd values that exceeded the observed median Kd. Multiple linear regression showed that TOC, amorphous aluminum and iron oxides contents, anion exchange capacity, pH, and silt content, jointly explained about 53% of the variance in PFOS Kd in soils. Variable charge soils with net positive surface charges, and moderate to elevated TOC content, generally displayed enhanced PFOS sorption than in temperate or tropical soils with TOC as the only sorbent phase, especially at acidic pH ranges. For the first time, two artificial neural networks were developed to predict the measured PFOS Kd (R2 = 0.80) in the soils. Overall, both TOC and surface charge characteristics of soils are important for describing PFOS sorption.]]> Thu 23 Jun 2022 14:06:17 AEST ]]> Exploring the Composition and Functions of Plastic Microbiome Using Whole-Genome Sequencing https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:49403 Thu 22 Feb 2024 11:32:12 AEDT ]]> Fingerprinting Plastic-Associated Inorganic and Organic Matter on Plastic Aged in the Marine Environment for a Decade https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39702 Thu 22 Feb 2024 11:29:44 AEDT ]]> Mechanism of the Thermal Decomposition of Chlorpyrifos and Formation of the Dioxin Analog, 2,3,7,8-Tetrachloro-1,4-dioxino-dipyridine (TCDDpy) https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:43270 Thu 15 Sep 2022 11:55:26 AEST ]]> Biofilms Enhance the Adsorption of Toxic Contaminants on Plastic Microfibers under Environmentally Relevant Conditions https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:49928 polyethylene>nylon>polyester. The concentrations of adsorbed Pb and PFOS were 4-25% and 20-85% higher in aged MFs and varied among the polymer types. The increased contaminant adsorption was linked with the altered surface area and the hydrophobic/hydrophilic characteristics of the samples. Overall, the present study demonstrates that biofilms play a decisive role in contaminant-plastic interactions and significantly enhance the vector potential of MFs for toxic environmental contaminants. We anticipate that knowledge generated from this study will help refine the planetary risk assessment of MPs.]]> Thu 15 Jun 2023 12:09:35 AEST ]]> Insights into the Chemical Mechanism for CO2(aq) and H+ in Aqueous Diamine Solutions - An Experimental Stopped-Flow Kinetic and H-1/C-13 NMR Study of Aqueous Solutions of N,N-Dimethylethylenediamine for Postcombustion CO2 Capture https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:49925 9.0 (k7 = 6.99 × 103 M–1·s–1). Below this pH, the formation of protonated monocarbamic acid (DMEDACOOH2) via the pathway involving DMEDAH+ and CO2(aq) becomes active and contributes to the kinetics despite the 107-fold decrease in the rate constant between the two pathways. 1H and 13C NMR spectra as a function of decreasing pH (increasing HCl concentration) at 25.0 °C have been evaluated here to confirm the protonation events in DMEDA. Calculations of the respective DMEDA nitrogen partial charges have also been undertaken to support the NMR protonation study. A comparison of the DMEDA kinetic constants with the corresponding data for piperazine (PZ) reveals that despite the larger basicity of DMEDA, the enhanced and superior kinetic performance of PZ with CO2(aq) above its predicted Bronsted reactivity is not observed in DMEDA.]]> Thu 15 Jun 2023 11:34:48 AEST ]]> Global Exposure to Per- and Polyfluoroalkyl Substances and Associated Burden of Low Birthweight https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:48155 Thu 09 Mar 2023 09:37:46 AEDT ]]> Tooeleite Transformation and Coupled As(III) Mobilization Are Induced by Fe(II) under Anoxic, Circumneutral Conditions https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:51866 Thu 02 Nov 2023 14:47:06 AEDT ]]> Model for CO₂ leakage including multiple geological layers and multiple leaky wells https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:7771 Sat 24 Mar 2018 08:41:56 AEDT ]]> Carbon dioxide postcombustion capture: a novel screening study of the carbon dioxide absorption performance of 76 amines https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:8269 Sat 24 Mar 2018 08:33:28 AEDT ]]> An experimental and kinetic modeling study of the reaction of CHF₃ with methane https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:1077 Sat 24 Mar 2018 08:32:09 AEDT ]]> Assessing influence of experimental parameters on formation of PCDD/F from ash derived from fires of CCA-treated wood https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:1753 Sat 24 Mar 2018 08:27:27 AEDT ]]> Fluoride removal by calcite: evidence for fluorite precipitation and surface adsorption https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:1683 7.5) are not equipped to describe this complex system, largely because the PHREEQ model includes only precipitation reactions, whereas a combination of adsorption and precipitation parameters are required.]]> Sat 24 Mar 2018 08:27:22 AEDT ]]> Thermal decomposition of captan and formation pathways of toxic air pollutants https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:9975 Sat 24 Mar 2018 08:14:24 AEDT ]]> Air pollutants formed in thermal decomposition of folpet fungicide under oxidative conditions https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:12285 Sat 24 Mar 2018 08:10:11 AEDT ]]> Thermal activation of antigorite for mineralization of CO₂ https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:20096 Sat 24 Mar 2018 08:00:09 AEDT ]]> A mechanistic and kinetic study on the formation of PBDD/Fs from PBDEs https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:20091 Sat 24 Mar 2018 08:00:08 AEDT ]]> Quantum chemical study on formation of PCDT/TA from 2-chlorothiophenol precursor https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:20094 Sat 24 Mar 2018 08:00:07 AEDT ]]> Toward the understanding of chemical absorption processes for post-combustion capture of carbon dioxide: electronic and steric considerations from the kinetics of reactions of CO₂(aq) with sterically hindered amines https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:19716 Sat 24 Mar 2018 07:53:45 AEDT ]]> Leptin-mediated modulation of steroidogenic gene expression in hypoxic zebrafish embryos: implications for the disruption of sex steroids https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:21764 –1) from 0–72 h postfertilization (hpf), a developmental window when steroidogenesis is unregulated by pituitary influence, resulted in the up-regulation of cyp11a, cyp17, and 3β-hsd and the down-regulation of cyp19a. Similar gene expression patterns were observed for embryos exposed to 10 mM cobalt chloride (CoCl₂, a chemical inducer of hypoxia-inducible factor 1, HIF-1), suggesting a regulatory role of HIF-1 in steroidogenesis. Testosterone (T) and estradiol (E2) concentrations in hypoxic embryos were greater and lesser, respectively, relative to the normoxic control, thus leading to an increased T/E2 ratio. Expression of the leptin-a gene (zlep-a) was up-regulated upon both hypoxia and CoCl₂ treatments. Functional assays suggested that under hypoxia, elevated zlep-a expression might activate cyp11a and 3β-hsd and inhibit cyp19a. Overall, this study indicates that hypoxia, possibly via HIF-1-induced leptin expression, modulates sex steroid synthesis by acting directly on steroidogenic gene expression.]]> Sat 24 Mar 2018 07:53:07 AEDT ]]> Sulfur fixation in wood mapped by synchrotron X-ray studies: implications for environmental archives https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:6877 Sat 24 Mar 2018 07:49:46 AEDT ]]> From bioavailability science to regulation of organic chemicals https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:27094 Sat 24 Mar 2018 07:40:35 AEDT ]]> Evidence for microRNA-mediated regulation of steroidogenesis by hypoxia https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:27283 Sat 24 Mar 2018 07:40:21 AEDT ]]> Gas phase thermal oxidation of endosulfan and formation of polychlorinated dibenzo-p-dioxins and dibenzofurans https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:26093 Sat 24 Mar 2018 07:39:55 AEDT ]]> Mineral-biochar composites: molecular structure and porosity https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:29588 Sat 24 Mar 2018 07:32:08 AEDT ]]> Pore-water carbonate and phosphate as predictors of arsenate toxicity in soil https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:29932 Cucumis sativa L) using 10 contrasting soils. Arsenate phytotoxicity was shown to be related to soluble carbonate and phosphate. The data indicated that dissolved phosphate and carbonate had an antagonistic impact on arsenate toxicity to cucumber. To predict arsenate phytotoxicity in soils with a diverse range of soil solution properties, both carbonate and phosphate were required. The relationship between arsenic and pore-water toxicity parameters was established initially using multiple regression. In addition, based on the relationship with carbonate and phosphate we successively applied a terrestrial biotic ligand-like model (BLM) including carbonate and phosphate. Estimated effective concentrations from the BLM-like parametrization were strongly correlated to measured arsenate values in pore-water (R2 = 0.76, P < 0.001). The data indicates that an ion interaction model similar to the BLM for arsenate is possible, potentially improving current risk assessments at arsenic and co-contaminated soils.]]> Sat 24 Mar 2018 07:30:55 AEDT ]]> Formation of environmentally persistent free radicals on α-Al₂O₃ https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:29772 2O3(0001) surface toward formation of phenolic EPFRs, under conditions relevant to cooling down zones of combustion systems. We show that, molecular adsorption of phenol on α-Al2O3(0001) entails binding energies in the range of −202 kJ/mol to −127 kJ/mol. The dehydroxylated alumina catalyzes the conversion of phenol into its phenolate moiety with a modest activation energy of 48 kJ/mol. Kinetic rate parameters, established over the temperature range of 300 to 1000 K, confirm the formation of the phenolate as the preferred pathways for the adsorption of phenol on alumina surfaces, corroborating the role of particulate matter in the cooling down zone of combustion systems in the generation of EFPRs.]]> Sat 24 Mar 2018 07:30:33 AEDT ]]> Development of a hybrid process and system model for the assessment of wellbore leakage at a geologic CO₂ sequestration site https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:4448 Sat 24 Mar 2018 07:18:06 AEDT ]]> Conversion of CHF₃ to CH₂=CF₂ via reaction with CH₄ and CaBr₂ https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:4445 Sat 24 Mar 2018 07:18:05 AEDT ]]> Toward rational design of amine solutions for PCC applications: the kinetics of the reaction of CO₂(aq) with cyclic and secondary amines in aqueous solution https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:22247 Sat 24 Mar 2018 07:17:34 AEDT ]]> Formation of PCDD/Fs in oxidation of 2-chlorophenol on neat silica surface https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:24331 p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) from their precursors. We have identified 2,6-dichlorophenol (2,6-DCPh), 2,4-dichlorophenol (2,4-DCPh), and 2,4,6-trichlorophenol (2,4,6-TriCPh), but have detected no chlorinated benzenes (CBzs). The detected chlorinated and nonchlorinated DD/Fs comprise dibenzo-p-dioxin (DD), 1- and 2-monochlorodibenzo-p-dioxin (1-, 2-MCDD), 1,6-, 1,9-, 1,3-dichlorodibenzo-p-dioxin (1,6-, 1,9-, 1,3-DCDD), 4-monochlorodibenzofuran (4-MCDF), and 4,6-dichlorodibenzofuran (4,6-DCDF) at the reaction temperatures of 350 and 400 °C. However, at a lower reaction temperature, 250 °C, we have detected no PCDD/Fs. We have demonstrated that neat silica surfaces catalyze the generation of PCDD/Fs from chlorophenols at the upper range of the catalytic formation temperature of PCDD/F. The present finding proves the generation of PCDD/Fs on particles of fly ash, even in the absence of transition metals.]]> Sat 24 Mar 2018 07:16:37 AEDT ]]> Reduced uranium phases produced from anaerobic reaction with nanoscale zerovalent iron https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:25215 Sat 24 Mar 2018 07:13:59 AEDT ]]> Pyrolysis of glyphosate and its toxic products https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:46654 N-methylaminomethylphosphonic acid, have been located. Both the initial products decompose to dimethylamine (DMA), and the mechanism of further decomposition and toxic products is explored. Global potential energy surfaces for the initial decomposition of DMA are presented together with chemical kinetic modeling wherein the rate constants employed have been calculated from the quantum chemical data. Time and temperature evolution of the expected toxic products are presented and discussed.]]> Mon 28 Nov 2022 17:29:39 AEDT ]]> A diamine-based integrated absorption-mineralization process for carbon capture and sequestration: energy savings, fast kinetics, and high stability https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36515 Mon 25 May 2020 14:00:47 AEST ]]> Adverse Effects of Inherent CaO in Coconut Shell-Derived Activated Carbon on Its Performance during Flue Gas Desulfurization https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:41075 Fri 22 Jul 2022 17:04:25 AEST ]]> Use of Routine Soil Tests to Estimate Pb Bioaccessibility https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:42224 Fri 19 Aug 2022 11:28:25 AEST ]]> Time-Dependent Remobilisation of Non-Extractable Benzo[a]pyrene Residues in Contrasting Soils: Effects of Aging, Spiked Concentration, and Soil Properties https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:41827 Fri 12 Aug 2022 12:52:20 AEST ]]>