Purification of diatomite powder by acid leaching for use in fabrication of porous ceramics

Şan, Osman; Gören, Remzi; Özgür, Cem

doi:10.1016/j.minpro.2009.04.007

Cited by 84 publications

(32 citation statements)

References 9 publications

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“…Besides, the use of synthetic adsorbents is considered inapt for developing countries because of its high manufacturing cost. Recently, attempts have been made to increase the sorption capacity of natural adsorbents towards heavy metals by chemical modification of their surface (Knoerr et al 2013;Ş an et al 2009;Zhu et al 2012;Liu et al 2013;Han et al 2006Han et al , 2009Jeon et al 2009;Zou et al 2009;Choi et al 2012). The common and highest concentration for heavy metal adsorption in aqueous solution in most recent investigations has been between 200 and 300 mg/l.…”

Section: Introductionmentioning

confidence: 99%

Adsorption isotherm studies of Cu (II) and Co (II) in high concentration aqueous solutions on photocatalytically modified diatomaceous ceramic adsorbents

2017

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Photocatalytically modified ceramic adsorbents were synthesized for the removal of high concentration Cu (II) and Co (II) ions from their aqueous solutions. The raw material, diatomaceous aluminosilicate mineral was modified using silver and anatase titanium oxide nanoparticles. Batch adsorption experiment was carried out on the targeted metal ions and the results were analyzed by the Langmuir and Freundlich equation at different concentrations (100-1000 mg/l) and the characteristic parameters for each adsorption isotherm were determined. As-received raw materials do not exhibit any sorption capacity for high concentration Cu 2? and Co 2? adsorbates. However, the adsorption isotherms for modified diatomaceous ceramic adsorbents could be fitted well by the Langmuir model for both Cu 2? and Co 2? with correlation coefficient (R) of up to 0.99953. The highest and lowest monolayer coverage (q max ) were 121.803 and 31.289 mg/g for Cu 2? and Co 2? , respectively. The separation factor (R L ) in the experiment was less than one (\1), indicating that the adsorption of metal ions on the Ag-TiO 2 -modified ceramic adsorbent is favorable. The highest adsorption capacity (K f ) and intensity (n) constants obtained from Freundlich model are 38.832 (Cu 2? on ZEO-T) and 5.801 (Co 2? on STOX-Z).

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Section: Introductionmentioning

confidence: 99%

Adsorption isotherm studies of Cu (II) and Co (II) in high concentration aqueous solutions on photocatalytically modified diatomaceous ceramic adsorbents

2017

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“…Although very simple and effective, calcination of raw DE leads to sintering of the DE frustules and making crystalline silica that possess toxicity and it is undesirable for commercial applications . Thus, chemical methods, generally relying on acid treatment of a raw DE in a hot medium are preferred . It is worth mentioning that the acid leaching treatment times are strongly dependent on the source of raw DE (i.e., impurities).…”

Section: De Silica: Structure Purification and Surface Functional Pmentioning

confidence: 99%

“…It is worth mentioning that the acid leaching treatment times are strongly dependent on the source of raw DE (i.e., impurities). In this field, major contributions have come from Goren et al, who explored the use of hydrochloric acid as the leaching agent and studied the HCl concentration, incubation time, incubation time, and concentration of DE in the leaching medium . For biomedical and some other applications, it is critical to retain and obtain intake diatom microcapsule structures from raw materials that is challenging and requires delicate the size‐dependent separation process to remove fractured diatom parts.…”

Section: De Silica: Structure Purification and Surface Functional Pmentioning

confidence: 99%

Diatom Silica for Biomedical Applications: Recent Progress and Advances

Maher

Kumeria

et al. 2018

Adv Healthcare Materials

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Diatoms are unicellular photosynthetic algae enclosed in porous 3D nanopatterned silica enclosures called "frustules." The diatom frustules are made from biosilica self-assembled into intricate porous shells that feature unique properties including high specific surface area, biocompatibility, tailorable surface chemistry, thermal stability, and high mechanical and chemical resistance. The ability to cultivate diatoms in artificial environments and their abundant availability of diatom frustules as mineable fossilized mineral deposits (diatomite or diatomaceous earth; DE) make diatom silica a promising natural alternative to synthetic porous silica for a broad range of biomedical, environmental, agricultural, and energy applications. This review article provides a comprehensive and current account of the use of natural DE silica materials in biomedical applications focused mainly on drug delivery with some highlights on biosensing, tissue engineering, and clotting agents. The article also covers some basic physical and chemical aspects of DE material such as purification, surface chemical functionalization, biocompatibility, and cellular uptake that are critical for the development of an efficient drug carrier.

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“…21 The chemical composition (wt%) of diatomite before and after purification were determined by X-ray fluorescence spectrometry (ADVANT'XP+), as summarized in Table 1.…”

Section: Diatomitementioning

confidence: 99%

Influence of Activated Condition on the Structure of Diatomite-templated Carbons and Their Electrochemical Properties as Supercapacitors

Chuan

Yang

et al. 2017

Electrochemistry

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The diatomite-templated carbons were prepared using diatomite as template and furfuryl alcohol as carbon resource, and were further activated using potassium hydroxide as an activating agent. The structure, pore parameters, and electrochemical capacity of diatomite-templated carbons after activation were investigated to evaluate the influence of activated condition. The results showed active carbons contained a proportion of disordered materials in the form of amorphous carbon and ordering decreased at higher activation temperatures, however, it had little relationship to KOH/carbon mass ratio. Pore parameters, such as the specific surface area and pore volume, as well as the micropore volume, showed a growing trend with the increase of activation temperature and KOH/carbon mass ratio but micro porosity showed an opposite trend. The specific capacitance of all samples were ranging from 51.5 to 98.1 F g −1 at current density of 1 A g −1 and capacitance retention could maintain at more than 70% at current density of 20 A g −1 , indicating they had good electrochemical properties. Moreover, electrochemical property became better as activation temperature and KOH/carbon mass ratio decreased.

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Purification of diatomite powder by acid leaching for use in fabrication of porous ceramics

Cited by 84 publications

References 9 publications

Adsorption isotherm studies of Cu (II) and Co (II) in high concentration aqueous solutions on photocatalytically modified diatomaceous ceramic adsorbents

Adsorption isotherm studies of Cu (II) and Co (II) in high concentration aqueous solutions on photocatalytically modified diatomaceous ceramic adsorbents

Diatom Silica for Biomedical Applications: Recent Progress and Advances

Influence of Activated Condition on the Structure of Diatomite-templated Carbons and Their Electrochemical Properties as Supercapacitors

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