Caracterização e avaliação de fatores que determinam a remoção de microcistina-LR em carvão ativado granular produzido a partir de diferentes matérias-primas

Araújo, Larissa Sene; Coutinho, Aparecido dos Reis; Méndez, Manoel Orlando Alvarez; Moruzzi, Rodrigo Braga; Calijuri, Maria do Carmo; Cunha, Daví Gasparini Fernandes

doi:10.1590/s1413-41522018177756

Cited by 7 publications

(5 citation statements)

References 30 publications

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“…The only exception was GAC since the highest retention values for the three analytes were obtained by using 0.05 g of the adsorbent. A decrease in the adsorption capacity of the GAC was also observed by Borges et al 36 and Araujo et al 37 The GAC particles were larger than those of the other adsorbents and equivalent to those of XAD-2 (Table 2). However, the irregular shape of the GAC particles led to poor column packing compared to the others.…”

Section: Resultssupporting

confidence: 77%

Emission and Collection of Polycyclic Aromatic Hydrocarbons From Raw Asphalt Samples Heated at 130 °C

et al. 2020

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The emission and collection of polycyclic aromatic hydrocarbons (PAHs) in the aqueous solution and asphalt samples obtained from different refineries in Brazil were evaluated. The aqueous solution and asphalt samples were heated under an argon atmosphere at 50 and 130 °C, respectively, for 60 min in a closed system. The targeted PAHs for the aqueous solution were acenaphthene, anthracene, and fluoranthene, while those for the asphalt samples were naphthalene, acenaphthylene, acenaphthene, fluorene, phenanthrene, fluoranthene, pyrene, and benzo[a]anthracene. These were all taken from the US EPA list. The performances of Amberlite XAD-2, high-density polyethylene (HDPE), silica (Si), polyurethane foam (PUF), and granular activated carbon (GAC) in collecting the PAHs from the vapor phase by gas−solid adsorption were compared. High-performance liquid chromatography with a diode array detector was used to quantify the mixtures of PAHs retained by the adsorbents. PUF and XAD-2 had the highest PAH retention capacity. For the aqueous solution, PUF showed adsorption yields of 100% for all the investigated PAHs. XAD-2 was also a good adsorbent (adsorption yields >90%), followed by HDPE (75−90% adsorption yields). For silica and GAC, the adsorption yields depended strongly on the PAHs. Alternatively, for the asphalt samples, the adsorption yield decreased dramatically for all the evaluated PAHs, showing that the asphalt matrix had a strong influence on the adsorption capacity of the adsorbents. In this case, the total PAH retention was 47.2% for PUF, 46.8% for XAD-2, 29.9% for GAC, 27.3% for Si, and 19.8% for HDPE. The retention/elution processes on the adsorbent surfaces were also evaluated by atomic force microscopy.

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Section: Resultssupporting

confidence: 77%

Emission and Collection of Polycyclic Aromatic Hydrocarbons From Raw Asphalt Samples Heated at 130 °C

et al. 2020

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“…De acordo com os coeficientes de correlação (R 2 ) para cada ajuste, a isoterma que melhor representa o processo de adsorção é a de Langmuir, que obteve o valor mais próximo de 1. Resultado contrário aos realizados com o biocarvão do bagaço da laranja para adsorção de ácido acético [25] e corroborado com os experimentos de [26] com biocarvão de cascas de laranja para remoção de contaminantes inorgânicos Zinco (Zn), Alumínio (Al), Cádmio (Cd), Cobre (Cu), Níquel (Ni) e Chumbo (Pb) e do orgânico Etilbenzeno e [27] com carvão ativado granular. Segundo este modelo, estamos partindo dos pressupostos que a adsorção acontece em monocamadas, com sítios ativos do carvão em igual afinidade pelo adsorvato, em que as interferências na adsorção de sítios vizinhos são desprezadas, e uma das características importantes para o presente artigo é que a isoterma de Langmuir indica que a adsorção é reversível [28,18].…”

Section: Isotermas De Adsorçãounclassified

Utilização do biocarvão de bagaço de laranja na remoção de tetraciclina em água residuária

et al. 2021

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RESUMO Diversos estudos têm relatado a presença de micropoluentes emergentes em níveis de traços em diversas partes do mundo, sendo encontrados em esgotos sanitários, efluentes hospitalares, efluentes industriais, águas superficiais, ambientes marinhos e sedimentos. Neste contexto, o presente artigo se baseou no estudo da capacidade de remoção da tetraciclina nos efluentes utilizando um tratamento terciário à base de biocarvão de bagaço de laranja. A metodologia foi baseada no estudo das interações com o fármaco e na aplicação em efluentes domésticos. O modelo de Langmuir foi o que melhor se adaptou ao biocarvão, configurando adsorção de natureza física, favorável para o processo de dessorção. O modelo cinético que mais se ajustou foi o de pseudo-segunda ordem e o tempo de equilíbrio estimado para o biocarvão foi de oito minutos. O método espectrofotométrico apresentou-se seguro, econômico e viável para monitoramento do processo adsortivo. O biocarvão teve capacidade de adsorção da tetraciclina de 100% em águas residuárias domésticas e a eficiência da filtração com biocarvão foi em média 25% maior do que com o carvão comercial. Diante do exposto conclui-se a possibilidade de conversão de um resíduo da agroindústria de baixo valor e sem destinação apropriada, em um produto de valor agregado, o biocarvão do bagaço da laranja, a ser utilizado como tratamento terciário para o reuso de efluentes na irrigação de culturas e como adsorvente para remoção da tetraciclina em águas residuárias domésticas.

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“…Similarly, the nature of functional groups on the carbon surface is determinant in the capacity of trapping MCs [95]. For instance, it was reported that there is strong proton adsorption in the case of the presence of several hydroxyl or phenolic groups under certain pH conditions [95,97,100]. Activated carbon may derive from different materials, namely wood, coal, coconut shells, or peat [75,92,[101][102][103].…”

Section: Filtration and Complexationmentioning

confidence: 99%

Multi-Soil-Layering Technology: A New Approach to Remove Microcystis aeruginosa and Microcystins from Water

Mugani

Prisca

Hejjaj

et al. 2022

Water

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Eutrophication of surface waters caused by toxic cyanobacteria such as Microcystis aeruginosa leads to the release of secondary metabolites called Microcystins (MCs), which are heptapeptides with adverse effects on soil microbiota, plants, animals, and human health. Therefore, to avoid succumbing to the negative effects of these cyanotoxins, various remediation approaches have been considered. These techniques involve expensive physico-chemical processes because of the specialized equipment and facilities required. Thus, implementing eco-technologies capable of handling this problem has become necessary. Indeed, multi-soil-layering (MSL) technology can essentially meet this requirement. This system requires little space, needs simple maintenance, and has energy-free operation and high durability (20 years). The performance of the system is such that it can remove 1.16 to 4.47 log10 units of fecal contamination from the water, 98% of suspended solids (SS), 92% of biological oxygen demand (BOD), 98% of chemical oxygen demand (COD), 92% of total nitrogen (TN), and 100% of total phosphorus (TP). The only reported use of the system to remove cyanotoxins has shown a 99% removal rate of MC-LR. However, the mechanisms involved in removing this toxin from the water are not fully understood. This paper proposes reviewing the principal methods employed in conventional water treatment and other technologies to eliminate MCs from the water. We also describe the principles of operation of MSL systems and compare the performance of this technology with others, highlighting some advantages of this technology in removing MCs. Overall, the combination of multiple processes (physico-chemical and biological) makes MSL technology a good choice of cyanobacterial contamination treatment system that is applicable in real-life conditions, especially in rural areas.

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Caracterização e avaliação de fatores que determinam a remoção de microcistina-LR em carvão ativado granular produzido a partir de diferentes matérias-primas

Cited by 7 publications

References 30 publications

Emission and Collection of Polycyclic Aromatic Hydrocarbons From Raw Asphalt Samples Heated at 130 °C

Emission and Collection of Polycyclic Aromatic Hydrocarbons From Raw Asphalt Samples Heated at 130 °C

Utilização do biocarvão de bagaço de laranja na remoção de tetraciclina em água residuária

Multi-Soil-Layering Technology: A New Approach to Remove Microcystis aeruginosa and Microcystins from Water

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