Tuning structural characteristics of red mud by simple treatments

Kurtoğlu, Samira Fatma; Soyer-Uzun, Sezen; Uzun, Alper

doi:10.1016/j.ceramint.2016.08.072

Cited by 24 publications

(20 citation statements)

References 59 publications

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“…Acidification methods improve the removal capacity of red mud of water contaminants by dissolving the calcium and acidsoluble salts, which in turn create new cavities and increase the surface area. Acids used for this purpose include concentrated hydrochloric acids, dilute hydrogen chloride or nitric acids [11,13,[27][28][29]. However, contrasting results have also been reported with regards to acid treatment, which was found to dissolve a portion of cancrinite and another type of compounds responsible for adsorption sites [30].…”

Section: Modifications Of Red Mud For Adsorption Processesmentioning

confidence: 99%

Application of modified red mud in environmentally-benign applications: A review paper

Joseph

Taufiq‐Yap

Krishnan

et al. 2019

Environmental Engineering Research

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Red mud (RM) is a waste product that results from bauxite refining via the Bayer process. Its disposal remains an issue which raises significant environmental concerns, particularly if disposed on land or water bodies. Much research has been done on the use of red mud for environmentally-benign applications such as wastewater treatment, catalysis, the production of construction materials and glass ceramics, and for the recovery of metals. This paper reviews the current efforts made in the utilization of red mud as a valuable industrial by-product, which in turn should minimize its harmful impact on the environment. This detailed review compiles and highlights a variety of novel applications of modified red mud as a coagulant, an adsorbent for wastewater treatment, as well as, its use in catalytic processes and in building materials. The physico-chemical properties of red mud can be tuned by a range of treatment methods include acidification, neutralization and heat treatment. As revealed from the literature reviewed, modifications on red mud for the removal of various types of contaminants have shown promising results. However, further amendment and modifications on red mud are needed to utilize this industrial waste in many other industrial applications.

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Section: Modifications Of Red Mud For Adsorption Processesmentioning

confidence: 99%

Application of modified red mud in environmentally-benign applications: A review paper

Joseph

Taufiq‐Yap

Krishnan

et al. 2019

Environmental Engineering Research

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“…Uma das maiores áreas específicas para a LV sem qualquer tratamento foi encontrada por Wang (2005) A LVB apresentou a seguinte análise mineralogia: gibbsita (Al(OH)3) (00-029-0041), sodalita (Na8(Al6Si6O24(CO3)(H2O)3)) (01-085-2066/00-003-0338), calcita (CaCO3) (00-001-0837), hematita (Fe2O3) (01-087-1164)) e anatásio (TiO2) (00-001-0562). A fase dominante na lama vermelha é a hematita, representada pelos picos 24,12°, 33,16°, 35,65°, 40,90°, 49,49°, 54,12°, 62,54°e 64,00°. Na amostra LVC após o processo de calcinação, verifica-se o desaparecimento dos picos 18,27°e 20,27° e 21,30° correspondentes à gibbsita, o que pode indicar a decomposição da mesma em Al2O3 (KURTOGLU et al, 2016;CONCEIÇÃO et al, 2016). Verifica-se que para a LVC a os picos de maiores intensidades correspondem à hematita (Fe2O3), devido à decomposição de hidróxidos de ferro em hematita e pela decomposição de minerais complexos.…”

Section: Caracterização Do Materials Adsorventeunclassified

“…Verifica-se que para a LVC a os picos de maiores intensidades correspondem à hematita (Fe2O3), devido à decomposição de hidróxidos de ferro em hematita e pela decomposição de minerais complexos. Segundo Kurtoglu et al (2016) Os picos 25,28° e 29,36°, referentes ao anatásio e calcita, respectivamente, permaneceram inalterados em todos os difratogramas.…”

Section: Caracterização Do Materials Adsorventeunclassified

“…Este resultado também foi observado porLiang et al (2014) que verificou a dissolução da fase sodalita, após a realização do tratamento com ácido nítrico (HNO3). Além disso, houve um aumento da intensidade da gibbsita para o pico 18,27°, comprovando que minerais complexos como sodalita, podem reagir com o HNO3 e formar hidróxidos de alumínio(KURTOGLU et al, 2016).…”

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Remoção de tolueno via processo de adsorção utilizando lama vermelha

Júnior

Maciel

Carvalho

et al. 2020

BJD

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RESUMO O objetivo deste trabalho é avaliar a capacidade da lama vermelha (LV), nas formas in natura (LVB), térmica (LVC) e quimicamente ativada (LVA), como adsorventes para remoção de tolueno em efluentes aquosos. A caracterização das amostras mostrou que os materiais são essencialmente mesoporoso, suas partículas não apresentam tamanhos e formas definidas, e seus principais constituintes são: gibbsita, sodalita, calcita, hematita e anatásio. Para a LVC foi aplicada a função de desejabilidade através do planejamento de experimentos, sendo obtido valor ótimo de concentração inicial de 3,0 mmol/L, dosagem de adsorvente de 10 g/L e pH de 4, para otimização do processo de adsorção. Para a avaliação da cinética de adsorção das amostras verificou-se que o modelo de pseudo-segunda foi o que melhor representou os resultados experimentais. No estudo do equilíbrio de adsorção o modelo de Sips foi o que melhor se ajustou aos dados experimentais para todos os adsorventes estudados, apresentando um coeficiente de determinação bem próximo à unidade.

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“…Uzuna et al. used red mud rich in Fe 2 O 3 to load Ru for an ammonia decomposition test and found that Fe 3 N y moieties and Ru metal synergized to promote catalytic activity. Unfortunately, the authors needed to be above 600 °C to achieve a conversion rate of more than 99 % and did not systematically study the effect of Ru‐Fe atomic ratio on ammonia decomposition performance.…”

Section: Introductionmentioning

confidence: 99%

Bimetallic Ru‐Fe Nanoparticles Supported on Carbon Nanotubes for Ammonia Decomposition and Synthesis

et al. 2020

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Alloy catalysts can achieve superior performance to single metal while reducing the cost by fine‐tuning the composition and morphology. Bimetallic Ru‐Fe nanoparticles were synthesized via liquid‐phase reduction method followed by impregnation with multiwall carbon nanotubes (CNTs) to prepare Ru‐Fe/CNTs catalysts. The Ru3Fe/CNTs catalyst yields a superior catalytic stability for ammonia decomposition compared to the Ru/CNTs catalyst. Hence, the ammonia synthesis rate of the Ru3Fe/CNTs catalyst was significantly higher than that of Ru/CNTs catalyst. The potential of bimetallic catalysts with reasonable composition and proportion will expand the research of efficient catalysts for ammonia decomposition and synthesis.

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Tuning structural characteristics of red mud by simple treatments

Cited by 24 publications

References 59 publications

Application of modified red mud in environmentally-benign applications: A review paper

Application of modified red mud in environmentally-benign applications: A review paper

Remoção de tolueno via processo de adsorção utilizando lama vermelha

Bimetallic Ru‐Fe Nanoparticles Supported on Carbon Nanotubes for Ammonia Decomposition and Synthesis

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