Characterization of activated carbons from different sources and the simultaneous adsorption of Cu, Cr, and Zn from metallurgic effluent

Lima, Liliane Schier de; Quináia, Sueli Pércio; Melquíades, Fábio Luiz; Biasi, G; Garcia, Jarem Raul

doi:10.1016/j.seppur.2013.11.034

Cited by 28 publications

(10 citation statements)

References 38 publications

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“…The mineral carbons used to study adsorption of heavy metals from water are peat, lignite, anthracite, graphite and principally the bituminous carbon, which is the most used. The bituminous carbon has been physically activated with steam and modified by impregnation with calcium, phosphoric acid, sulfur and nitric acid, and subsequently, a thermal treatment has been applied [27][28][29][30][31][32]. Table 1.…”

Section: Mineral Carbonsmentioning

confidence: 99%

Removal of Heavy Metals Using Adsorption Processes Subject to an External Magnetic Field

Virgen¹,

Vázquez²,

Montoya³

et al. 2018

Heavy Metals

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Adsorption is a broadly used process for the removal of heavy metals and the world trend is directed to the application of new technologies to intensify existing processes. The properties of the magnetic field (intensity and arrangement) and the intrinsic magnetic properties of the adsorbent and the adsorbate are decisive for satisfactory results. The intensity of the magnetic field is important, because this implies that the greater number of spins present will align with the magnetic field according to the magnetic nature present, allowing the mobility of the adsorbate and generating heterogeneity on the surface of the adsorbent. Similarly, the arrangement of the magnetic field will determine the direction of the magnetic field lines. The application of a magnetic field as an alternative for the intensification of the adsorption process based on the consideration that the magnetic field is safe, environmentally friendly and economic.

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Section: Mineral Carbonsmentioning

confidence: 99%

Removal of Heavy Metals Using Adsorption Processes Subject to an External Magnetic Field

Virgen¹,

Vázquez²,

Montoya³

et al. 2018

Heavy Metals

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“…A maximum surface area of 148.3 m 2 g -1 was achieved at an activation temperature of 800°C. It has also been shown that increasing the carbon-to-metal oxide ratio in the ash matrix as well as the activation temperature can increase the surface area, pore volume, and hence the adsorption capacity [8][9][10][11][12][13][14][15]. These efforts were not focused on optimizing the experimental conditions to improve the surface properties of AC.…”

Section: Introductionmentioning

confidence: 99%

Thermochemical treatment of fly ash for synthesis of mesoporous activated carbon

Shawabkeh

Aslam

Hussien

2015

J Therm Anal Calorim

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A mesoporous activated carbon is produced from oil fly ash (OFA) using chemical and thermal treatments at different activation conditions. The ash samples were refluxed with a range of compositions of sulfuric, nitric, and phosphoric acids followed by thermal activation in a tubular reactor. The composition of the acids and the reaction temperature were optimized to yield mesoporous activated carbon with a high surface area and yield. Several characterization methods were used to study the surface characteristics, morphology, functional groups, phase transition, and adsorption. FTIR spectra show the existence of carboxylic and amine functional groups, which increase with increasing percentage of nitric acid. SEM spot analysis and EDX demonstrate that the carbon content increases from 77.4 to 95.7 % upon chemical treatment. Specimens treated with a mixture comprises of 3.6 mol L -1 H 2 SO 4 , 6.4 mol L -1 HNO 3 and 5.9 mol L -1 H 3 PO 4 and activated at 990°C have a BET surface area of 375.7 m 2 g -1 when compared to 4 m 2 g -1 for the original OFA. The BJH adsorption pore distribution indicates an average pore size of 50 Å with a total mesopore volume of 0.2211 cm 3 g -1 (73.6 % of the total pore volume). Thus, waste OFA is a suitable raw material for the production of activated carbon.

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“…Por esses motivos, a mistura desses dois carvões, como visualizado nas amostras W610ep, W610ea e WU610, apresentam caráter alcalino (Tabela 1). Com relação ao diâmetro médio de poros, os dois carvões (P e CCB) são muito próximos, 5,225 e 5,375 Å, respectivamente, indicando que apresentam boa capacidade de adsorção (LIMA et al, 2014). A amostra LA, carvão ácido proveniente de pinus, demonstrou maior valor médio de índice de iodo quando comparado aos demais carvões.…”

Section: Resultsunclassified

Estudo da capacidade de adsorção de carvões ativados comerciais <i>versus</i> tempo de armazenamento

Fischer

Lima²,

Felsner

et al. 2019

Ciênc. Florest.

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O carvão ativado pulverizado quando bem embalado e estocado não possui um prazo de validade regulamentado. Em geral, esta validade é determinada de acordo com requisitos estabelecidos pelo próprio fabricante e está diretamente relacionada a uma estimativa de tempo superior ao tempo em que o produto ficará estocado no cliente até a sua utilização. Neste trabalho, avaliou-se a eficiência de carvões ativados de base seca e umectados, relacionando parâmetros de capacidade adsortiva (índice de iodo e umidade) destes materiais com o tempo. Os carvões contendo superfície alcalina não apresentaram variação nos parâmetros avaliados ao longo do tempo de armazenamento, pois não apresentaram significância estatística, uma vez que os valores de Fregressão<Fcrítico e os valores de p> 0,05, tanto para base seca como úmida. Dos carvões com caráter ácido (pH corrigido), apenas um tipo foi mais sensível à adsorção de umidade e iodo ao longo do tempo. A partir da equação de reta oriunda da análise de regressão linear para este carvão, obteve-se a correlação Índice de Iodo = 824 – 0,370 x dias, indicando que o tempo de armazenamento para este material foi igual a 605 dias, garantindo que o valor do índice de iodo seja igual ao valor limite de 600 mg I2.g-1 carvão.

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Characterization of activated carbons from different sources and the simultaneous adsorption of Cu, Cr, and Zn from metallurgic effluent

Cited by 28 publications

References 38 publications

Removal of Heavy Metals Using Adsorption Processes Subject to an External Magnetic Field

Removal of Heavy Metals Using Adsorption Processes Subject to an External Magnetic Field

Thermochemical treatment of fly ash for synthesis of mesoporous activated carbon

Estudo da capacidade de adsorção de carvões ativados comerciais <i>versus</i> tempo de armazenamento

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