Aluminum, Al

Skibniewska, Ewa M.; Skibniewski, Michał

doi:10.1007/978-3-030-00121-6_12

Cited by 6 publications

(2 citation statements)

References 213 publications

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“…Można przypuszczać, że ponownie sprawował wtedy funkcję lekarza nadwornego Jana Olbrachta. Po śmierci władcy pełnił w 1502 r. obowiązki lekarza na dworze królewskim Aleksandra Jagiellończyka 49 .…”

Section: Przedstawiciele Szlachty Mazowieckiejunclassified

Przedstawiciele szlachty mazowieckiej w składzie dworu królewskiego za panowania Jana Olbrachta (1492-1501)

Nalewajek

2020

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Section: Przedstawiciele Szlachty Mazowieckiejunclassified

Przedstawiciele szlachty mazowieckiej w składzie dworu królewskiego za panowania Jana Olbrachta (1492-1501)

Nalewajek

2020

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“…Several studies report that aluminum contamination can cause harmful effects on different organisms. In plants, excessive Al 3+ ions in soils mainly affect the roots and can trigger deficiency in the absorption and transport of nutrients, loss of biomass and genotype changes(Skibniewska and Skibniewski 2019). In fishes, it can induce oxidative stress, in addition to cause fatal damages to the nervous and respiratory system; Gensemer and Playle 1999; Walton 2011).…”

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Aplicação do resíduo da extração sólido-líquido de alginato da alga Sargassum filipendula para bioadsorção de íons alumínio

Pereira de Sá Costa

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Aluminum is a metal classified as toxic and its extensive use in industrial processes generates large amounts of effluents contaminated. Such effluents are usually disposed of in water bodies, but the legislation requires pre-treatment of these before their disposal. Therefore, this work aims to analyze the efficacy of the residue from the solid-liquid extraction of alginate (here called RES) in the removal of aluminum ions. The experimental design of the Rotational Central Composite Design (RCCD) associated with the Response Surface Methodology (RSM) was carried out to determine optimal values of important factors in the operation and showed that the agitation has no significant impact on the process, since the concentration of the solution and the dosage of the biomass is directly proportional to each other, so the optimized RES dosage was set at 2 g/L, while the aluminum initial concentration up to 3 mmol/L reveals to favor the process. pH showed to be a very influent parameter in the aluminum biosorption by RES and, better removal results were obtained at pH 4. The kinetic study revealed that the process equilibrium time (60 min) was not influenced by the increase in the initial concentration. Mathematical modeling indicated the occurrence of more than one removal mechanism, being associated with physical and chemical interactions such as ion exchange. In addition, the equilibrium model adjustments revealed that the residue has an energetically heterogeneous surface. The maximum removal capacity obtained was 1.431 mmol/g at 25 ºC. Thermodynamic study revealed that the process is exothermic and spontaneous. The simplified batch design showed that a small amount of waste (140 g) is needed to treat 10L of solution, removing 90% of aluminum at 1 mmol/L. The biosorbent was characterized before and after Al adsorption and the analyses indicated that the biomaterial is basically composed of macropores, in addition to having considerable thermal resistance at temperatures up to 150 ºC. In the efficiency comparison, the biomaterial stands out in relation to other biosorbents derived from algae previously studied for the removal of aluminum. The evaluation of ion exchange along with SEM-EDX analysis showed that sodium ions are the main exchangeable cations involved in the bio-absorption mechanism of the Al-RES system, followed by calcium, magnesium and a small share of potassium ions. The FTIR analysis and the functional group esterification test showed that mainly carboxylic groups, amine and sulfonate are involved in the studied biosorption system. The fixed bed study showed that the optimized parameters of continuous operation were a feed flow rate of 0.5 mL/min and an initial aluminum concentration of 1 mmol/L. Under these conditions the breakthrough time was about 200 minutes with a satisfactory percentage of aluminum removal (93%). The eluent tested most suitable for the regeneration of the biosorbent was the acid solution of 0.1 mol/L of HNO3. The residue demonstrated viable application, maintaining good perform...

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