Removal of aluminium from aqueous solution by four wild-type strains of Aspergillus niger

Boriová, Katarína; Čerňanský, Slavomír; Matúš, Peter; Bujdoš, Marek; Šimonovičová, Alexandra

doi:10.1007/s00449-018-2033-x

Cited by 14 publications

(2 citation statements)

References 23 publications

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“…The activation was performed according to the following procedures. Briefly, the strain was inoculated onto the modified Martin agar medium and cultured in a biochemical incubator, at 26 • C, for one week [28,29]. The medium and tunicate cellulose nanocrystals were sterilized at 121 • C for 20 min.…”

Section: Anti-mold Effect Of Cellulose Nanocrystalsmentioning

confidence: 99%

Study on the Anti-Biodegradation Property of Tunicate Cellulose

Chen

Mondal

et al. 2020

Polymers

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Tunicate is a kind of marine animal, and its outer sheath consists of almost pure Iβ crystalline cellulose. Due to its high aspect ratio, tunicate cellulose has excellent physical properties. It draws extensive attention in the construction of robust functional materials. However, there is little research on its biological activity. In this study, cellulose enzymatic hydrolysis was conducted on tunicate cellulose. During the hydrolysis, the crystalline behaviors, i.e., crystallinity index (CrI), crystalline size and degree of polymerization (DP), were analyzed on the tunicate cellulose. As comparisons, similar hydrolyses were performed on cellulose samples with relatively low CrI, namely α-cellulose and amorphous cellulose. The results showed that the CrI of tunicate cellulose and α-cellulose was 93.9% and 70.9%, respectively; and after 96 h of hydrolysis, the crystallinity, crystalline size and DP remained constant on the tunicate cellulose, and the cellulose conversion rate was below 7.8%. While the crystalline structure of α-cellulose was significantly damaged and the cellulose conversion rate exceeded 83.8% at the end of 72 h hydrolysis, the amorphous cellulose was completely converted to glucose after 7 h hydrolysis, and the DP decreased about 27.9%. In addition, tunicate cellulose has high anti-mold abilities, owing to its highly crystalized Iβ lattice. It can be concluded that tunicate cellulose has significant resistance to enzymatic hydrolysis and could be potentially applied as anti-biodegradation materials.

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Section: Anti-mold Effect Of Cellulose Nanocrystalsmentioning

confidence: 99%

Study on the Anti-Biodegradation Property of Tunicate Cellulose

Chen

Mondal

et al. 2020

Polymers

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“…Boriová et al [137] examined four distinct wild-type strains of A. niger for Al 3+ removal, using living and non-living microorganisms. The results obtained by using nonliving A. niger biomass were unsatisfactory, since the biosorption efficiency did not exceed 9%.…”

Section: Using Fungal Biomass As Biosorbent Of Aluminummentioning

confidence: 99%

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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