Synthesis of zeolite A using raw kaolin from Ethiopia and its application in removal of Cr(<scp>III</scp>) from tannery wastewater

Ayele, Lijalem; Pérez, Eduardo; Mayoral, Álvaro; Chebude, Yonas; Dı́az, Isabel

doi:10.1002/jctb.5334

Cited by 29 publications

(15 citation statements)

References 20 publications

(39 reference statements)

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“…However, the decrease in the adsorption capacity for a high adsorbent dosage could be attributed to the adsorption sites remaining unsaturated, which resulted from the increase in the number of available adsorption sites. A similar observation was reported for the capture of chromium (III) ions on zeolite A when using raw kaolin as the silica source [ 42 ].…”

Section: Resultssupporting

confidence: 82%

Utilization of Rice Husk Ash in the Preparation of Graphene-Oxide-Based Mesoporous Nanocomposites with Excellent Adsorption Performance

Liou

2021

Materials

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Rice husk is an agricultural biomass waste. Burning rice husks in an oxygenic atmosphere releases thermal energy and produces ash that is rich in silica. Rice husk ash (RHA) can be used as a sustainable source of silica for producing high-value-added products. In this study, mesostructural graphene oxide (GO)/SBA-15, a graphene-based hybrid material, was synthesized from RHA. The materials are inspected by Fourier transform infrared spectrometer, Raman spectrometer, field-emission scanning electron microscopy, transmission electron microscopy, surface area analyzer, and X-ray diffraction analyzer. Studies have revealed that GO/SBA-15 possesses various oxygen functional groups that are helpful for dye adsorption. The material consisted of high pore volume of 0.901 cm3/g, wide pores of diameter 11.67 nm, and high surface area of 499 m2/g. Analysis of the methylene blue (MB) adsorption behavior of GO/SBA-15 composites revealed that their adsorption capacity depended on the gelation pH, GO content, adsorbent dosage, and initial dye (MB) concentration. The highest adsorption capacity of GO/SBA-15 was 632.9 mg/g. Furthermore, the adsorption isotherms and kinetics of GO/SBA-15 were investigated. This study demonstrated the great advantage of treated RHA and the potential of this material for use in organic dye adsorption.

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Section: Resultssupporting

confidence: 82%

Utilization of Rice Husk Ash in the Preparation of Graphene-Oxide-Based Mesoporous Nanocomposites with Excellent Adsorption Performance

Liou

2021

Materials

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“…For the zeolitic material before and after calcination (Figure 4b), the presence of two distinct structures was observed. The first one had rounded shapes like woolen balls, which is characteristic of polycrystals of sodalite, and the second one had the form of crystalline cubes, which is typical of the zeolite A morphology [29,34,35]. Therefore, these results are in concordance with the analysis made by XRD.…”

Section: Characterization Of Catalystssupporting

confidence: 85%

Renewable Diesel Production from Palm Fatty Acids Distillate (PFAD) via Deoxygenation Reactions

et al. 2021

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The reactions to produce liquid biofuels from a palm fatty acid distillate (PFAD) under hydrogen absence were carried out using 10 wt% NiO/zeolite (Ni/Zeo), 10 wt% Co3O4/zeolite (Co/Zeo), and 10 wt% (NiO + Co3O4)/zeolite (NiCo/Zeo) as catalysts. The zeolite was synthesized by a thermal and chemical treatment from natural clay, obtaining a zeolite A and sodalite mixture. Catalytic activity was evaluated as a function of reaction temperature (250, 300, and 350 °C) during 0.5 h and using 5 wt% of catalyst. The reaction products were classified as organic liquid products (OLPs), gaseous products, and solid waste. The OLPs fractions were separated by fractional distillation, and the products were identified and quantified using gas chromatography coupled to a mass spectrometer detector (GC-MS). The results showed yields to OLPs above 50% for all catalysts and temperatures. However, the highest yield to OLPs of 67.9% was reached with a NiCoZeo catalyst at 300 °C. In this reaction, a higher yield to hydrocarbons was obtained (84.8%), indicating a cooperative effect between Ni and Co in the catalyst. Hydrocarbons such as heptadecane (C17H36), pentadecane (C15H26), and other alkanes-alkenes with lower carbon chains were the main products. Therefore, deoxygenation of PFAD using a low-cost Ni-Co catalyst was shown to be an economic and viable way to produce diesel-type biofuels.

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“…Among zeolites, 4A zeolite, Na 12 [(AlO 2 ) 12 (SiO 2 ) 12 ]•27H 2 O, possesses an α-cavity with a 0.41 nm diameter comprised of eight β-cages linked by 12 4-rings, which create its adsorption, screening, and ion exchange performance [5,6]. Thus, 4A zeolite has been widely used as an adsorbent [7], catalyst [8,9], ion-exchanger [10,11], and detergent builders [12][13][14]. Among more than 200 different types of zeolites, 4A zeolite is one of the most important microporous materials due to its widespread industrial use [15].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of 4A Zeolite from Kaolinite-Type Pyrite Flotation Tailings (KPFT)

2018

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As a solid waste, kaolinite-type pyrite flotation tailings (KPFT) are a type of low-quality kaolin that contain impurities, such as iron and titanium. In this study, KPFT were calcined at 800 °C for two hours. The calcined production (CKPFT), which is mainly metakaolin, was used as the silicon and aluminum source to synthesize 4A zeolite (Na12[(AlO2)12(SiO2)12]·27H2O) via hydrothermal synthesis. The optimal hydrothermal synthesis conditions were determined from X-ray diffraction phase analysis, relative crystallinity (RC), and cation ion exchange capacity (CEC). The optimal hydrothermal synthesis conditions were determined to be a ratio of 5 g CKPFT, 6.5 g NaOH, 65 mL H2O, crystallization temperature 110 °C, and crystallization time of three hours. Under the optimal hydrothermal synthesis conditions, the RC and CEC of the synthesized 4A zeolite were 40.77% and 210.32 mg CaCO3·g−1, respectively. Further characterizations including pore size distribution, scanning electron microscopy, energy dispersive X-ray, thermogravimetry-differential scanning calorimetry, and Fourier transform infrared spectroscopy were performed. The results revealed that impurities in KPFT do not affect the synthesis of 4A zeolite. The surface morphology of the synthesized 4A zeolite was composed of chamfered-edged cubes with a particle size of one to three μm that was thermally stable up to approximately 890 °C.

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Synthesis of zeolite A using raw kaolin from Ethiopia and its application in removal of Cr(III) from tannery wastewater

Cited by 29 publications

References 20 publications

Utilization of Rice Husk Ash in the Preparation of Graphene-Oxide-Based Mesoporous Nanocomposites with Excellent Adsorption Performance

Utilization of Rice Husk Ash in the Preparation of Graphene-Oxide-Based Mesoporous Nanocomposites with Excellent Adsorption Performance

Renewable Diesel Production from Palm Fatty Acids Distillate (PFAD) via Deoxygenation Reactions

Synthesis of 4A Zeolite from Kaolinite-Type Pyrite Flotation Tailings (KPFT)

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