https://nova.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:46637 Wed 28 Feb 2024 14:49:30 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:51675  10−4) for both adults and children, indicating lifetime cancer risk due to the consumption of contaminated vegetables. The target hazard quotient (THQ) of each heavy metal was THQ < 1.0 (except Ni in few samples), indicating that consumers have no non-cancer risk when exposed to a single heavy metal. However, hazard index (HI) values of heavy metals were greater than unity in contaminated WC and AW for adults and children. Meanwhile, WC, AW, and SP samples for children emerged as potential health risks of inhabitants in the studied areas. The outcomes of the present investigation might assist the regulatory bodies concerned in setting new strategies through monitoring the quality of marketed vegetables to minimize the risks to humans.]]> Wed 13 Sep 2023 13:30:19 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:40272 Wed 13 Mar 2024 19:12:21 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:37215 Wed 10 Nov 2021 15:04:38 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47041 Wed 07 Feb 2024 14:34:42 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:49060 Wed 03 May 2023 15:53:57 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50703 Wed 02 Aug 2023 13:36:51 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50383 Tue 31 Oct 2023 08:53:22 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:54528 Tue 27 Feb 2024 19:44:26 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47667 3N₄/TiO₂ nanocomposite was prepared as a photocatalyst (PC) active under visible light (λ≥420 nm) by preparation of graphitic carbon nitride (g-C₃N₄) from melamine followed by an efective easy impregnation method. Several g-C₃N₄/ TiO₂ composites containing 1 to 12 wt% g-C₃N₄ were synthesized and characterized using X-ray difraction (XRD) analysis, scanning electron microscopy (SEM), thermogravimetric analysis (TGA), diferential thermal analysis (DTA), photoluminescence (PL) spectroscopy, difusion refectance spectroscopy (DRS), and Brunauer–Emmett–Teller (BET) measurements. A photocatalytic mechanism is proposed based on the relative positions of the energy bands of the two constituents. Compared with its individual components, g-C₃N₄/TiO₂ demonstrated unusually high photocatalytic activity for phenol decomposition in aqueous phase under visible-light irradiation. The heterojunction was optimized in the 5 wt% g-C₃N₄/TiO₂ nanocomposite due to the well-matched bandgap structure (optimum loading) and excellent electron–hole pair separation in the conduction and valence band of TiO₂ and g-C₃N₄, respectively. After 2 h of visible-light irradiation, 68 % degradation was observed when using this optimum composition. The performance was slightly decreased (to 66 %) after recycling of the catalyst four times (used a total of five times), but remained reliable for industrial applications considering other factors. In this system, TiO₂ (Degussa P25) seems to play the principal PC role, while g-C₃N₄ acts as a sensitizer for absorption of visible light. Due to the enhanced visible-light absorption ability enabled by g-C₃N₄ in the composite, stable electron–hole (e⁻–h⁺) pairs produced at the interface of the heterojunction lead to generation of highly reactive free radicals (·O₂, ·OH, etc.) which together initiate degradation of phenol but individually sufer from some limitation that must be overcome. The thermal stability and recycling efciency of this PC will enable its use in industrial applications as a cost-efective sustainable cleanup candidate.]]> Tue 24 Jan 2023 15:47:58 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:46340 −1 (Bangladesh drinking water standard) during pre-monsoon, while 11 samples out of 20 were unable to remove As below the WHO provisional guideline value of 10 µg L⁻¹. During post-monsoon, none of the samples exceeded 50 µg L−1, but eight of them exceeded 10 µg L⁻¹. The Fe removal efficiencies of AIRPs were evident in more than 80% samples. Although As removal efficiency was found to be substantial, a cancer risk assessment indicates that hazard quotient (HQ) and carcinogenic risk (CR) of As in treated water for adults and children are above the threshold limits. Thus, additional reductions of As concentrations in treated water are needed to further reduce the excess cancer risk due to As in drinking water. Since 55% and 40% of the AIRPs were unable to remove As < 10 µg L⁻¹ during pre-monsoon and post-monsoon, further improvement including changes in AIRP design, regular cleaning of sludge, and periodic monitoring of water quality are suggested. Future research is needed to determine whether these modifications improve the performance of AIRPs.]]> Tue 15 Nov 2022 15:04:48 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:47037 CO32– > SO42– > Cl– > NO3–, although no significant inhibitory effects were observed with cations like Na+, K+, Mg2+, Ca2+, and Al3+. The positive correlation of AsV adsorption capacity with temperature demonstrated that the endothermic process and the negative value of Gibbs free energy increased (−14.95 to −12.47 kJ/mol) with increasing temperature (277 to 313 K), indicating spontaneous reactions. Desorption and regeneration showed that recycled Fe-chips, Fe-salt, and Zr–Fe-salt-coated biochars can be utilized for the effective removal of AsV up to six-repeated cycles.]]> Tue 13 Dec 2022 14:15:30 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39514 Tue 09 Aug 2022 13:57:02 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:43850 Tue 04 Oct 2022 11:53:40 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50558 Tue 01 Aug 2023 10:33:02 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:45345 −1 for 24 h by Zr–FeBC and Fe-BC at pH 5 and 4, respectively. Desorption studies were performed to investigate the reusability, cost-effectiveness and stability of the adsorbents Zr–FeBC and Fe-BC. The adsorption–desorption study suggests that both examined biochars have considerable potentiality as adsorbent candidates in removing as well as recovery of P from wastewaters. Results also reveal that the regenerated Zr–FeBC and Fe–BC could be utilized repetitively in seven adsorption–desorption cycles using NaOH as a desorbing agent, which greatly reduces the P-removal cost from wastewaters. Thus, P enriched biochar could potentially be used as fertilizer in the agriculture sector.]]> Thu 27 Oct 2022 15:20:47 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:42716 Thu 01 Sep 2022 11:33:23 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39614 Mon 29 Jan 2024 18:47:47 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:38393 Mon 29 Jan 2024 18:44:27 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:43431 2SO₄ to have better adsorption properties. On the contrary, modification of chitosan was carried out by acetaldehyde solution and acetic acid. Composite adsorbent was obtained as a mixture, comprising of modified cellulose and chitosan in a specific proportion (2g:1g). The surface characteristics of treated cellulose, chitosan and composite sample were evaluated by FTIR and SEM analysis. In addition, batch adsorption experiments were carried out to measure the influences of pH of the solution, adsorbent dosage and the initial concentration of metal ions. The maximum removal efficiency of Cr, Pb and Cd by composites was 56, 85 and 94%, respectively, at pH 4 when the metal concentration and adsorbent dosage were 60 ppm and 1.0 g L^-1. The maximum adsorption of Cr, Pb and Cd by composites was 55, 80 and 91 mg g^-1, respectively, at pH 4 when the metal concentration and adsorbent dosage were 120 ppm and 1.0 g L^-1.]]> Mon 19 Sep 2022 10:57:46 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39730 Mon 13 May 2024 13:29:27 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39301 Fri 03 Jun 2022 13:29:25 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:39995 Fri 01 Jul 2022 13:49:31 AEST ]]>