Synthesis, characterization and adsorption study of nano-sized activated alumina synthesized from kaolin using novel method

Salahudeen, Nurudeen; Ahmed, Abdulkarim S.; Al-Muhtaseb, Ala’a H.; Dauda, Mohammed; Waziri, Saidu M.; Jibril, Baba Y.; Al-Sabahi, Jamal Nasser

doi:10.1016/j.powtec.2015.04.024

Cited by 36 publications

(10 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A peculiar characteristic observed in this process is that during the calcination the dehydration has been related as a topotactic reaction 26 . By other hands, Bayerite (β-AlOH 3 ) and Gibbsite (α-AlOH 3 ) precursors could be used but the phase transformation pathway has different outcomes 13,[27][28][29][30][31][32][33][34][35] . Up to date literature highlights the effect of hydroxylated compounds directing the precipitation of aluminum hydroxide and as well on the alumina phase formation 18,[36][37][38] .…”

Section: Introductionmentioning

confidence: 99%

A Novel Synthesis Route of Mesoporous γ-Alumina from Polyoxohydroxide Aluminum

et al. 2018

View full text Add to dashboard Cite

Mesoporous gamma-aluminas (γ-Al 2 O 3 ) were synthesized starting from an unusual precursor of polyoxohydroxide aluminum (POHA). This precursor was obtained from aluminum oxidation in alkaline water-ethanol solvent in the presence of d-glucose that induces the formation of a gel, which leads to the POAH powder after ethanolic treatment. Precipitated POHAs were calcined at different temperatures (300, 400, 700 and 900 °C) resulting in the metastable γ-Al 2 O 3 phase. Whereas at 300 °C no γ-Al 2 O 3 phase was formed, unexpectedly, mesoporous γ-Al 2 O 3 was obtained at 400 ºC having a high specific surface area (282 m 2 /g) and a narrow pore size distribution. At higher temperatures, the aluminas had the expected decrease in surface area: 166 m 2 /g (700 °C) and 129 m 2 /g (900 °C), respectively. The structural change from POHA to alumina calcined at 400 ºC occurs directly without the need to isolate the hydroxide or oxyhydroxide aluminum precursors. Both POHA and transition aluminas were characterized by Fourier Transform Infrared spectroscopy (FTIR), X-ray diffraction (XRD), N 2 sorption and Scanning Electron Microscopy (SEM). These findings show an alternative route to produce high standard aluminas.

show abstract

Section: Introductionmentioning

confidence: 99%

A Novel Synthesis Route of Mesoporous γ-Alumina from Polyoxohydroxide Aluminum

et al. 2018

View full text Add to dashboard Cite

show abstract

“…As shown in Fig. , the 1074 cm −1 wavelength is associated with clusters of AL 3+ and O 2− ions on the surface of AL‐O vibration, and peaks of 740 and 623 cm −1 are related to symmetric bending of O‐AL‐O …”

Section: Resultsmentioning

confidence: 91%

“…As shown in Fig. 6, for activated alumina, the peaks at 3309 cm −1 , 2364 cm −1 , 1650 cm −1 , and 1075 cm −1 are related to the stretches of O-H or N-H groups, the AL-C band (which may be caused by CO 2 adsorption from 19,[47][48][49][50][51] X-ray diffraction analysis was performed to investigate the crystalline structure of the adsorbents and their phases. The XRD pattern of activated alumina is shown in Fig.…”

Section: Adsorbent Characteristicsmentioning

confidence: 99%

Piperazine‐modified activated alumina as a novel promising candidate for CO₂ capture: experimental and modeling

2018

View full text Add to dashboard Cite

In this research, the CO2 adsorption process was studied using modified activated alumina with a piperazine solution as a novel sorbent. Activated alumina was modified with a piperazine solution concentration in the range of 1–4 wt%. Adsorption experiments were performed to evaluate the operating parameters, including CO2 pressure in the range of 2–8 bar, adsorbent dosage in the range of 0.5–2 g, temperature in the range of 25–85°C and adsorbent mesh in the range of 200–800 micron. Maximum adsorption capacity (222.01 mg CO2/g modified activated alumina) was determined at a temperature of 25°C, pressure of 8 bar, and adsorbent dosage of 0.5 g, with a piperazine solution of 2 wt%. The results of the experiments showed that the rate of CO2 adsorption increases with increasing pressure and decreasing temperature. The Freundlich isotherm model with correlation coefficient of 0.999 was found to be the best for fitting the CO2 adsorption isotherm data. The kinetic study also indicated that the Elovich model fits the experimental kinetic data well. The negative values of Gibbs free energy change (ΔG°) and enthalpy change (ΔH°) show that the reaction is spontaneous in nature and exothermic. The negative value of entropy change (ΔS°) shows a reduction in the irregularity of the adsorption process. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd.

show abstract

“…One is Langmuir, which indicates the monolayer adsorption on uniform homogeneous surface with identical sites of adsorbent . The other is Freundlich, which indicates the heterogeneity of the adsorbent surface and considers multilayer adsorption . The Langmuir (equation 1) and Freundlich model (equation 2) are given as following:…”

Section: Resultsmentioning

confidence: 95%

Synthesis of H₄Mn₅O₁₂ Nanotubes Lithium Ion Sieve and Its Adsorption Properties for Li⁺ from Aqueous Solution

Guo

et al. 2019

ChemistrySelect

View full text Add to dashboard Cite

Li4Mn5O12 with nanotubes morphology was successfully prepared by hydrothermal and solid phase reaction. The as‐obtained adsorbent was determined by X‐ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM) and N2 ad/desorption technologies. The characterization results indicated that spinel H4Mn5O12 took on two‐dimensional nanotubes morphology with the diameter of pore ∼200 nm, BET surface area is 92.997 m2⋅g−1, and the corresponding pore size centers at 3.4, 35.9 and 156.5 nm. The adsorption experimental results showed that the maximum Li+ adsorption capacity of H4Mn5O12 was as high as 37.0 mg⋅g−1, and the adsorption process fit well with Langmuir model. In addition, adsorption kinetic experimental data were well fitted by the pseudo‐second‐order model, which indicated the adsorption process followed chemisorption involving in ion exchange. The effects of co‐existing cations on lithium recovery suggested that Na+, K+, Ca2+ and Mg2+ ions had very small effect on recovery of lithium. The regeneration of H4Mn5O12 for the multicyclic Li+ adsorption and desorption were also assessed. The result implied that most of Li+ could be desorbed within 40 min, but the adsorption capacity decreased when the number of cycles was five, which indicated that the structure of H4Mn5O12 was needed to be improved. Lithium adsorption onto H4Mn5O12 could be attributed to electrostatic interaction and ion exchange between Li+ and H+ according to the results of adsorption isotherm and kinetics properties.

show abstract

Synthesis, characterization and adsorption study of nano-sized activated alumina synthesized from kaolin using novel method

Cited by 36 publications

References 29 publications

A Novel Synthesis Route of Mesoporous γ-Alumina from Polyoxohydroxide Aluminum

A Novel Synthesis Route of Mesoporous γ-Alumina from Polyoxohydroxide Aluminum

Piperazine‐modified activated alumina as a novel promising candidate for CO₂ capture: experimental and modeling

Synthesis of H₄Mn₅O₁₂ Nanotubes Lithium Ion Sieve and Its Adsorption Properties for Li⁺ from Aqueous Solution

Contact Info

Product

Resources

About

Synthesis, characterization and adsorption study of nano-sized activated alumina synthesized from kaolin using novel method

Cited by 36 publications

References 29 publications

A Novel Synthesis Route of Mesoporous γ-Alumina from Polyoxohydroxide Aluminum

A Novel Synthesis Route of Mesoporous γ-Alumina from Polyoxohydroxide Aluminum

Piperazine‐modified activated alumina as a novel promising candidate for CO2 capture: experimental and modeling

Synthesis of H4Mn5O12 Nanotubes Lithium Ion Sieve and Its Adsorption Properties for Li+ from Aqueous Solution

Contact Info

Product

Resources

About

Piperazine‐modified activated alumina as a novel promising candidate for CO₂ capture: experimental and modeling

Synthesis of H₄Mn₅O₁₂ Nanotubes Lithium Ion Sieve and Its Adsorption Properties for Li⁺ from Aqueous Solution