Lead Ions Sorption from Waste Solution Using Aluminum Hydroxide Modified Diatomite

Wang, Ying; Lu, Yong; Chen, Rongzhi; Ma, Lun; Jiang, Yong; Wang, Huan

doi:10.4236/jep.2014.56054

Cited by 7 publications

(4 citation statements)

References 26 publications

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“…For instance, iron nanoparticles that were treated with dopamine were coupled to frustules in order to obtain magnetic silica particles [ 12 ]. Another example is diatomite that was modified with aluminum and successfully tested in sewage treatment [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Are Diatoms “Green” Aluminosilicate Synthesis Microreactors for Future Catalyst Production?

et al. 2017

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Diatom biosilica may offer an interesting perspective in the search for sustainable solutions meeting the high demand for heterogeneous catalysts. Diatomaceous earth (diatomite), i.e., fossilized diatoms, is already used as adsorbent and carrier material. While diatomite is abundant and inexpensive, freshly harvested and cleaned diatom cell walls have other advantages, with respect to purity and uniformity. The present paper demonstrates an approach to modify diatoms both in vivo and in vitro to produce a porous aluminosilicate that is serving as a potential source for sustainable catalyst production. The obtained material was characterized at various processing stages with respect to morphology, elemental composition, surface area, and acidity. The cell walls appeared normal without morphological changes, while their aluminum content was raised from the molar ratio n(Al):n(Si) 1:600 up to 1:50. A specific surface area of 55 m2/g was measured. The acidity of the material increased from 149 to 320 µmol NH3/g by ion exchange, as determined by NH3 TPD. Finally, the biosilica was examined by an acid catalyzed test reaction, the alkylation of benzene. While the cleaned cell walls did not catalyze the reaction at all, and the ion exchanged material was catalytically active. This demonstrates that modified biosilica does indeed has potential as a basis for future catalytically active materials.

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Section: Introductionmentioning

confidence: 99%

Are Diatoms “Green” Aluminosilicate Synthesis Microreactors for Future Catalyst Production?

et al. 2017

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“…Adsorption isotherm (adsorption equilibrium) is usually described the equilibrium state between the amount of adsorbed metal ion onto the adsorbent surface ( ) e q and the concentration of metal ions in solution ( ) e C at a fixed both temperature and pH. The common equations used to describe adsorption isotherm are Langmuir [24] [25] and Freundlich [25] [26] in addition to Temkin [27]- [29] and Dubinin-Radushkevich (D-R) equation [30] [31]. The parameters of those equations can describe both the surface properties and the affinity of the adsorbent such as DL to the adsorbate such as metal ions.…”

Section: Introductionmentioning

confidence: 99%

Kinetic and Equilibrium Isotherms Studies of Adsorption of Pb(II) from Water onto Natural Adsorbent

Elmorsi¹,

Mohamed²,

Shopak³

et al. 2014

JEP

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In this research dobera leaves (DL), an agricultural waste, available in large quantity in south region of Saudi Arabia, were used as low-cost adsorbent for removal of metal ions such as Pb(II). Batch operation was used to study the equilibrium behavior of DL. The effects of initial concentration of Pb(II), solution pH, contact time and adsorbent dose were evaluated. To study the kinetics of adsorption of Pb(II) onto DL, pseudo-first-order, pseudo-second-order and intra-particle diffusion were used. Adsorption process undergoes pseudo-second-order kinetic as proved by the high value of R 2. Furthermore, to design the equilibrium data of adsorption of process, four adsorption isotherm models such as Langmuir, Freundlich Temkin and Dubinin-Radushkevich (D-R) were used. It is found that Langmuir equation has the highest value of R 2 (0.999) compared with other models. In presences of a mixture of Pb(II)/Ni(II), DL were found to be selective for Pb(II) ions with a high adsorptive capacity of 83 mg/g and show favorable adsorption with RL < 1. In addition, preliminary results indicate that DL are very effective adsorbent for the removal of Pb(II) ions (>90%) from drinking water with less competition of other ions present in water.

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“…Then, the mixture was kept standing to air for 12h and discard the supernatant and afterwards dried in an oven at 105˚C for 12h. Finally, the samples were grinded to 80 mesh and stored in the valve bag [8] . The prepared sample was named as Fe-diatomite.…”

Section: Methodsmentioning

confidence: 99%

Sorption of Pb(II) on Iron Hydroxide Modified Diatomite

Wang

Jiang

et al. 2015

AMR

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Fe-diatomite was prepared and applied for the sorption of Pb (II) from aqueous solution. The samples before and after modification were characterized by SEM and XRF. The results showed that iron hydroxide compound has been successfully loaded at the diatomite. Lead adsorption characteristics were studied in a batch system with respect to changes in initial concentration of lead, pH of solution, adsorbent dosage and temperature. It showed that the removal rate increased with pH, adsorbent additive amount, the temperature and decreased with the initial concentration.

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Lead Ions Sorption from Waste Solution Using Aluminum Hydroxide Modified Diatomite

Cited by 7 publications

References 26 publications

Are Diatoms “Green” Aluminosilicate Synthesis Microreactors for Future Catalyst Production?

Are Diatoms “Green” Aluminosilicate Synthesis Microreactors for Future Catalyst Production?

Kinetic and Equilibrium Isotherms Studies of Adsorption of Pb(II) from Water onto Natural Adsorbent

Sorption of Pb(II) on Iron Hydroxide Modified Diatomite

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