The effect of montmorillonite clay in alginate gel beads for polychlorinated biphenyl adsorption: Isothermal and kinetic studies

Barreca, Salvatore; Orecchio, Santino; Pace, Andrea

doi:10.1016/j.clay.2014.06.037

Cited by 93 publications

(35 citation statements)

References 52 publications

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“…As ligações iônicas presentes na nanoargila também podem estar influenciando, alojando também moléculas de água em seu interior. [23][24][25] Observa-se também na Figura 5b que em altas concentrações o agente reticulante não influência significativamente a capacidade de absorção de água. Em relação à zeólita, a quantidade utilizada foi de 5% para síntese dos grânulos, Tabela 3.…”

Section: Influência Da Incorporação De Nanocargas Na Matriz Poliméricunclassified

Otimização da síntese de hidrogéis nanocompósitos intercalados para possível aplicação na área médica

Fernandes¹,

Moura²,

Aouada³

2016

Quim. Nova

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. In this study, the hydrogel formulations based on polysaccharide sodium alginate were investigated for further development of intercalated nanocomposite hydrogels, for purposes of future applications in the areas of health as a carrier in drug delivery systems. Thus, the objective of the work dealt with in the optimization of hydrogels synthesis and obtaining nanostructured hydrogels with clay in an intercalated conformation. The optimization of the hydrogel synthesis was successful, and it is possible to define the materials and / or solutions to be used and concentrations of these solutions to the best formulations of hydrogels. The choice of the concentration of the polysaccharide, the type of crosslinking agent and nanofiller to continued development work, it was determined following criteria as the degree of swelling, and in some cases the physical properties, contributed to determine the best hydrogels. The development of intercalated nanocomposites hydrogel beads was confirmed by the X-ray diffraction technique, which thus could be used to observe evidence of effective incorporation or intercalation of the nanoclay in the hydrogel matrix.Keywords: hydrogels; nanocomposites; sodium alginate; nanofillers; intercalation. INTRODUÇÃOTendo em vista a necessidade de equipamentos sofisticados na área biomédica, os que são disponibilizados para utilização apresentam alto custo, sendo este um impasse no que diz respeito à aquisição. Deste modo, os biomateriais surgem como uma opção interessante, já que desde a última década vem se estudando e trabalhando com este tipo de material, principalmente na área médica. Existem diferentes maneiras de se definir o termo biomateriais. Dentre essas, os biomateriais são definidos como materiais utilizados na substituição de algum órgão vital que perdeu sua atividade no organismo. Atualmente o campo de aplicação engloba desde as próteses até a utilização para regeneração óssea. 1 Dentro da classe dos biomateriais, existem os polímeros, que são macromoléculas que se permitem serem moldadas de acordo com a área a ser empregada. 2 A utilização de polímeros está em ascendência, e se mostra altamente proveitoso na biomedicina principalmente quando se trata de polímeros naturais. A motivação está fundamentada nas propriedades como biodegradabilidade e biocompatibilidade. Dessa maneira, o alginato de sódio (sendo um polímero natural), em razão das propriedades já mencionadas e pelo fato de ser atóxico, termoestável e de baixo custo, vem recebendo grande atenção para tal finalidade. 3 O alginato de sódio é um polissacarídeo obtido por meio da extração de algas marrons (Phaeophyceae). As cadeias macromoleculares são lineares com segmento rígidos e flexíveis. 4 O segmento rígido é atribuído aos blocos G formado pelo monossacarídeo ácido α-L-gulurônico e o segmento flexível está associado aos blocos M que são constituídos de unidades monossacarídicas de ácido β-D-manurônico. 4 O alginato de sódio pode apresentar cadeias com apenas blocos M ou apenas blocos G, ou pode ser constituída por ...

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Section: Influência Da Incorporação De Nanocargas Na Matriz Poliméricunclassified

Otimização da síntese de hidrogéis nanocompósitos intercalados para possível aplicação na área médica

Fernandes¹,

Moura²,

Aouada³

2016

Quim. Nova

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“…According to all these studies, the K d of pyrene is equal to 5 -8 and the K d of phenanthrene ranges between 1.0 and 2.7. The K d values of PCBs, which were reported for model matrices such as alginate beads, surface sediments and sludge, are equal to 10-75 [37], [57]- [59].…”

Section: A Partition Coefficientsmentioning

confidence: 99%

Memory Effect of Aquatic Biofilms in the Partitioning of Polycyclic Aromatic Hydrocarbons (PAHs) and Polychlorinated Biphenyls (PCBs) in Water Streams

Bertini¹

2016

IJESD

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Abstract-Polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) are ubiquitous pollutants in the environment. Due to their physical-chemical properties, PAHs and PCBs can be accumulated in organic matrices such as living organisms, soil and sludge. Their toxicity and mutagenicity is a serious concern. In many cases an effective strategy to assess the pollution of water streams is to detect these compounds using biofilms, sediment and sludge as passive samplers.However, the absorption of hydrophobic compounds in biofilms is a reversible mechanism. The molecules of a specific pollutant can be desorbed back into the water column when specific conditions have changed. Furthermore, those molecules could be biodegraded by the microorganisms living inside that biofilm.Thus, the pollutant is not going to remain detectable inside that biofilm sample permanently, but only for a limited time. This is due to the memory effect.The aim of this work is to retrieve the most relevant data on this subject and build from scratch a simplified model. This will help to understand how microbial biofilms can influence the distribution of PAHs and PCBs in water streams.Absorption, desorption and biodegradation are the three main mechanisms considered for the calculations. This information will surely stimulate further research on this topic. Phenanthrene and pyrene were chosen as reference compounds for PAHs and Kaneclor 300, Aroclor 1260 and other tri-and tetra-chlorinated byphenils were chosen as reference for PCBs.

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“…To overcome these limitations, cost-effective and environmental friendly materials such as natural biopolymers have been extensively studied to remove pollutants from water by an adsorption process [1][2][3][4][5][6][7][8][9]. Moreover, due to the encapsulation ability of these biopolymers, advanced materials could be developed to perform adsorption process with subsequent separation.…”

Section: Introductionmentioning

confidence: 99%

Influence of a cationic surfactant on adsorption of p-nitrophenol by a magsorbent based on magnetic alginate beads

Obeid

Kolli

Talbot

et al. 2015

Journal of Colloid and Interface Science

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The paper focuses on the removal of p-nitrophenol by an adsorption process. A magnetic adsorbent was synthesized by encapsulation of magnetic functionalized nanoparticles using alginate as a green biopolymer matrix. A cationic surfactant, cetylpyridinium chloride (CPyCl), was used to confer a hydrophobic character to the magnetic beads and thus to promote their adsorption efficiency. The effect of different parameters such as initial concentrations of both PNP and CPyCl, contact time and solution pH value on the adsorption of PNP in the presence of CPyCl was investigated. It should be noted that combination of magnetic and adsorption properties in a same material is an interesting challenge which could overcome the recovery problems of pollutant-loaded adsorbent. min whereas 90% adsorption was attained within 2 hours. It should be noted that combination of magnetic and adsorption properties in a same material is an interesting challenge which could overcome the recovery problems of pollutant-loaded adsorbent.

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The effect of montmorillonite clay in alginate gel beads for polychlorinated biphenyl adsorption: Isothermal and kinetic studies

Cited by 93 publications

References 52 publications

Otimização da síntese de hidrogéis nanocompósitos intercalados para possível aplicação na área médica

Otimização da síntese de hidrogéis nanocompósitos intercalados para possível aplicação na área médica

Memory Effect of Aquatic Biofilms in the Partitioning of Polycyclic Aromatic Hydrocarbons (PAHs) and Polychlorinated Biphenyls (PCBs) in Water Streams

Influence of a cationic surfactant on adsorption of p-nitrophenol by a magsorbent based on magnetic alginate beads

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