Oil–water separation process with organoclays: A comparative analysis

Barros

et al. 2021

RSD

Most traditional methods are only used to remove free oil from wastewater, and they are not efficient for separating oil-water emulsions. The adsorption separation process can be widely applied for the treatment of emulsions, mainly due to the cost and benefit of the process and the wide variety of materials that can be used as adsorbents, for example activated carbon, clays, zeolites, etc. Among the various types of porous materials called "Metal Organic Frameworks" (MOFs) are the zeolitic imidazolate (ZIFs) structures. The zeolitic structure of the ZIFs allows to exhibit high surface areas and thus to be promising adsorbents. To evaluate the adsorption capacity of ZIF-8 in the removal of emulsified oil, ZIF-8 was synthesized using Zn metal and as organic binder 2-methylimidazole (Hmim), dissolved in methanol at room temperature. ZIF-8 was characterized by X-ray diffraction (XRD) technique to determine the crystalline structure. To evaluate the capacity of the emulsified oil, a pH-influence test and chemical kinetics were determined. The best pH of the emulsion for removal was pH 6. The chemical kinetics performed at pH 6 presented the best fit with the pseudo-second model with correlation coefficient 0.93. According to the kinetic data, a removal percentage of 92.43% was found with only 30 min of removal.

Section: Emulsion Oil/water Separationmentioning

confidence: 99%

“…Based on reports from the reviewed literature, the ideal temperature for adsorption of oil is room temperature (Rodrigues et al, 2010). Most authors reported a time of 1-6 h for adsorption process in the laboratory (Rodrigues et al, 2010, Mota, Rodrigues, & Machado, 2014.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Oil removal from oil/water emulsion by Zeolitic Imidazolate Framework-8 (ZIF-8): A study of pH, and adsorption kinetic

Barros

et al. 2021

RSD

“…A partir do DRX apresentado na Figura 8 verifica-se que os picos de caulinita e quartzo se mantiveram quando comparados com o difratograma da argila in natura (Figura 4). Esses picos são referentes ao mineral não esmectítico como o quartzo que se apresenta como impureza (Wang et al, 2004;Gonzaga et al, 2007;Rodrigues et al, 2010;Xi et al, 2010;Mota et al, 2012;Mota et al, 2014). As intensidades dos picos são reduzidas devido ao processo de sinterização ao qual a membrana foi submetida (tratamento térmico a 650 °C).…”

Section: Difração De Raio Xunclassified

Membrana cerâmica de baixo custo para tratamento de efluentes oleosos

Silva

et al. 2021

RSD

A poluição das águas é um dos grandes desafios da sociedade. Dentre os contaminantes, a grande quantidade de atividades industriais responsáveis pela geração de efluentes oleosos destaca-se pelos seus impactos causados ao meio ambiente, afetando, por exemplo, a manutenção da vida marinha e a produtividade de solos. Entre as técnicas de tratamento, o uso de membranas cerâmicas destaca-se pela alta eficiência no tratamento de efluentes oleosos, principalmente emulsões óleo-água. Em linha com o desenvolvimento da química verde, associada com o baixo custo, este trabalho tem como objetivo preparar membranas cerâmicas com uso da argila brasgel, abundante do território paraibano. A argila foi caracterizada com uso das técnicas de Difração de raios X, Espectroscopia de Fluorescência de raios X por Energia Dispersiva, Espectroscopia na região do infravermelho, Adsorção Física de Nitrogênio e Análises térmicas. A membrana foi obtida através da técnica de compactação a seco uniaxial e sinterizada a 650 oC, sendo realizados fluxo de água e fluxo permeado para obtenção do coeficiente de rejeição da membrana. Os resultados obtidos indicam que a argila brasgel apresenta todas as características correspondentes a esmectita, e a membrana de baixo custo apresentou elevada capacidade de rejeição, 100.00 %, o que a torna viável para tratamento de emulsões óleo água.

“…Due to that and their high adsorption capacity, clays have shown a high potential for oil/water emulsion wastewater treatment. In order to prove that, Mota et al [ 120 ] used, as part of their study, modified Brazilian clays (green calcium bentonite−aluminum clay minerals) to analyze further their performance in oil/water emulsion separation. Clay powders were modified with surfactants into their interlayer space, becoming organoclays, in order to achieve hydrophobicity and increase their adsorption capacity for pollutants such as oils.…”

Section: Introductionmentioning

confidence: 99%

Oil/Water Mixtures and Emulsions Separation Methods—An Overview

2023

Catastrophic oil spill accidents, oily industrial wastewater, and other types of uncontrolled release of oils into the environment are major global issues since they threaten marine ecosystems and lead to a big economic impact. It can also affect the public health of communities near the polluted area. This review addresses the different types of oil collecting methods. The focus of this work will be on the different approaches to materials and technologies for oil/water separation, with a special focus on water/oil emulsion separation. Emulsified oil/water mixtures are extremely stable dispersions being, therefore, more difficult to separate as the size of the droplets in the emulsion decreases. Oil-absorbent materials, such as sponges, foams, nanoparticles, and aerogels, can be adjusted to have both hydrophobic and oleophilic wettability while displaying a porous structure. This can be advantageous for targeting oil spills in large-scale environmental and catastrophic sets since these materials can easily absorb oil. Oil adsorbent materials, for example, meshes, textiles, membranes, and clays, involve the capture of the oily material to the surface of the adsorbent material, additionally attracting more attention than other technologies by being low-cost and easy to manufacture.