Optimizing the preparation conditions of activated carbons from olive cake using KOH activation

Abdel‐Ghani, Nour T.; El-Chaghaby, Ghadir A.; ElGammal, Mohamed H.; Rawash, El-Shaimaa A.

doi:10.1016/j.carbon.2016.10.073

Cited by 10 publications

(11 citation statements)

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“…To solve this issue, it is of a great significance to develop and design new methods for materials remove or organic pollutant degradation. Such conventional porous materials as activated carbons are widely used to remove organic pollutant in wastewater and environment . However, there are several disadvantages in using conventional porous materials such as time‐consuming, low efficiency for removing of hydrophilic pollutants, and difficult to regenerate …”

Section: Introductionmentioning

confidence: 99%

Synergetic Photocatalytic Nanostructures Based on Au/TiO₂/Reduced Graphene Oxide for Efficient Degradation of Organic Pollutants

Zhao

Xü

Jiang

et al. 2016

Part. Part. Syst. Charact.

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Recently, there is crucial interest in the design and fabrication of nanocatalysts for efficient decomposition of organic pollutants in wastewater using visible light. This work reports the assembling fabrication of synergetic photocatalytic Au/TiO2/RGO nanostructures by utilizing the reduced graphene oxide (RGO) as substrate material and efficient separator for electrons and holes. The Au/TiO2 nanostructures with a ≈7 nm TiO2 particles size are dispersed uniformly on RGO nanosheets. UV–vis diffuse reflectance spectroscopy verifies that Au/TiO2/RGO nanocomposites show strong absorption of visible light. The degradation efficiency after 1 h for hydroquinone under visible light and UV light is ≈77% and ≈90%, respectively. Under visible light, the calculated apparent rates (k) of the Au/TiO2/RGO nanocomposites are 0.0112 and 0.0174 min−1 for decomposition of methylene blue and hydroquinone. That are five times greater than that of bare TiO2. The high photocatalytic activity is mainly attributed to the synergy between RGO and Au/TiO2 nanostructure. The strategy of composite nanostructures assembling on RGO is ensured to have a great practicable potential for the designing of high efficient multielement composite nanoparticles catalysts.

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Section: Introductionmentioning

confidence: 99%

Synergetic Photocatalytic Nanostructures Based on Au/TiO₂/Reduced Graphene Oxide for Efficient Degradation of Organic Pollutants

Zhao

Xü

Jiang

et al. 2016

Part. Part. Syst. Charact.

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“…The raw walnut shell (RWRM) showed a complex FTIR spectrum (Figure 5(a)), similar to lignocellulosic materials (Abdel-Ghani et al., 2016). The strong broad band at 3500 cm −1 indicates O-H stretching vibration of hydroxyl groups.…”

Section: Resultsmentioning

confidence: 99%

Characterization and comparison of walnut shells-based activated carbons and their adsorptive properties

Qiu

Ren

et al. 2020

Adsorption Science & Technology

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The production of low-cost biologically activated carbons (BACs) is urgent need of environmental protection and ecological sustainability. Hence, walnut shells were treated by traditional pyrolysis, direct KOH impregnation and combined activation composed of hydrothermal carbonization and two-step H3PO4- and pyrolysis-activation process to obtain porous carbon with high adsorption capacity. It was found that the best adsorption capacity for iodine and organic dye methylene blue (MB) can be obtained using the KOH impregnation at impregnation ratio of 1:1 or combined activation comprising of 2 h H3PO4 activation and 1 h pyrolysis activation at 1000°C. The produced KOH, H3PO4/pyrolysis activated BACs at the optimum conditions are superior to that of commercial ACs, 9.4 and 1.3 times for MB removal, 4 and 4.5 times for iodine number respectively. Characterization results demonstrated their porous structure with very good textural properties such as high BET surface area (1689.1 m2/g, 1545.3 m2/g) and high total pore volume (0.94 cm3/g, 0.96 cm3/g). The N2 adsorption-desorption isotherm of H3PO4/pyrolysis activated hydrochar suggested the co-existence of micro and meso-pores. Moreover, they are more effective for the removal of Fe(III) and Cr(VI) from aqueous solution than the commercial AC, suggesting a promising application in the field of water treatment.

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“…Therefore, in recent years, magnetic adsorbents have been used to deal with water pollution problems, from the initial use of single magnetite as magnetic adsorbents to the synthesis of various surface modi ed functionalized magnetic nano-adsorbents to e ciently deal with pollutants in wastewater. Surface modi cation can not only improve the agglomeration of particles, but also modify the surface of nanomaterials according to the demand, so that the dispersibility, surface activity and compatibility with other materials can be improved, to make it more appropriate for the application [40][41][42][43][44][45][46][47] . In addition to introducing magnetism and surface modi cation, porous structure is also a widely used and effective method to improve the absorption capacity.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to introducing magnetism and surface modi cation, porous structure is also a widely used and effective method to improve the absorption capacity. The magnetic adsorbent is made into a porous structure, which increases the surface area, reduces the diffusion resistance, promotes the transfer of materials, and is bene cial to increase the adsorption capacity and speed up the adsorption [45][46][47][48][49][50][51][52] . Thus, at lower cost and facile synthetic method for the preparation of porous adsorbents with high speci c surface area architectures for highly adsorption performance is still in great demand.…”

Section: Introductionmentioning

confidence: 99%

Constructing Carbon-Coated Fe3O4 Hierarchical Microstructures with a Porous Structure and their Excellent Cr(VI) Ion Removal Properties

Cheng

Song

et al. 2021

Preprint

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Here, a facile solvothermal method coupled with an annealing strategy is developed to synthesize Fe3O4/carbon (Fe3O4@C) magnetic composite microstructures with different morphologies, including flower-like, hollow spheres and egg-like. Owing to the unique multi-porous and hollow structure, the as-prepared hierarchical Fe3O4@C hollow microspheres composite exhibit appealing performance as an absorbent of Cr(VI) ions in aqueous solution, delivering a high capacity of ca.197.2mg/g. Furthermore, the magnetic Fe3O4 ‘‘core’’ in composite hierarchical microstructures makes them easy to separate from aqueous systems by magnetic separation, the layer of carbon effectively prevents agglomerations of magnetic nanoparticles and expands their range of applications. The excellent Cr(VI) ions adsorbent activities of the Fe3O4@C magnetic composite microstructures would have a potential adsorbing material application in environmental purification.

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Optimizing the preparation conditions of activated carbons from olive cake using KOH activation

Cited by 10 publications

References 0 publications

Synergetic Photocatalytic Nanostructures Based on Au/TiO₂/Reduced Graphene Oxide for Efficient Degradation of Organic Pollutants

Synergetic Photocatalytic Nanostructures Based on Au/TiO₂/Reduced Graphene Oxide for Efficient Degradation of Organic Pollutants

Characterization and comparison of walnut shells-based activated carbons and their adsorptive properties

Constructing Carbon-Coated Fe3O4 Hierarchical Microstructures with a Porous Structure and their Excellent Cr(VI) Ion Removal Properties

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Optimizing the preparation conditions of activated carbons from olive cake using KOH activation

Cited by 10 publications

References 0 publications

Synergetic Photocatalytic Nanostructures Based on Au/TiO2/Reduced Graphene Oxide for Efficient Degradation of Organic Pollutants

Synergetic Photocatalytic Nanostructures Based on Au/TiO2/Reduced Graphene Oxide for Efficient Degradation of Organic Pollutants

Characterization and comparison of walnut shells-based activated carbons and their adsorptive properties

Constructing Carbon-Coated Fe3O4&nbsp;Hierarchical&nbsp;Microstructures with a Porous Structure and their Excellent Cr(VI) Ion Removal&nbsp;Properties

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Product

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Synergetic Photocatalytic Nanostructures Based on Au/TiO₂/Reduced Graphene Oxide for Efficient Degradation of Organic Pollutants

Synergetic Photocatalytic Nanostructures Based on Au/TiO₂/Reduced Graphene Oxide for Efficient Degradation of Organic Pollutants

Constructing Carbon-Coated Fe3O4 Hierarchical Microstructures with a Porous Structure and their Excellent Cr(VI) Ion Removal Properties