Effect of sulphuric acid treatment on the physico-chemical characteristics of kaolin clay

Panda, Achyut K.; Mishra, Braja Gopal; Mishra, Dhanada K.; Singh, Rahul

doi:10.1016/j.colsurfa.2010.04.022

Cited by 327 publications

(182 citation statements)

References 22 publications

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“…It has been reported that the removal of the structural hydroxyl groups in [AlO6] octahedral layer occurred along with the dissolving of Al 3+ due to acid treatment. This result is in agreement with that of Panda et al [28].…”

Section: Thermogravimetric Analysissupporting

confidence: 94%

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Gas Phase Oligomerization of Isobutene over Acid Treated Kaolinite Clay Catalyst

Al-Dhayan

Aouissi

2016

Bull. Chem. React. Eng. Catal.

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Natural Kaolin Clay was calcined and treated by sulfuric acid. The resulting solid acid catalyst was characterized by FTIR, TGA, and X-ray powder diffraction (XRD) and tested for isobutene oligomerization in a gas phase. The characterization results showed that the acid treated clay underwent chemical and structural transformations. After acid treatment, the Si/Al ratio was increased, and the crystalline raw clay became amorphous. The effects of various parameters such as reaction temperature, reaction time and contact time on isobutene oligomerization were investigated. Catalytic tests showed that isobutene oligomerization led to dimers and trimers as major products. Tetramers were obtained as byproducts. At relatively high reaction temperatures and long contact times, the conversion was enhanced while the selectivity of dimers was decreased in favor of higher oligomers.

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Section: Thermogravimetric Analysissupporting

confidence: 94%

“…The crystallinity and the interlayer structure of the clay material were found to be altered with acid treatment at and above 5 M concentrations. The crystalline pure clay became amorphous [28].…”

Section: Ft-ir Characterizationmentioning

confidence: 99%

Gas Phase Oligomerization of Isobutene over Acid Treated Kaolinite Clay Catalyst

Al-Dhayan

Aouissi

2016

Bull. Chem. React. Eng. Catal.

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“…Based on the analyses, the phases identified in the Ajebo kaolin include Al2O9Si2 and SiO2 while for the Darazo kaolin; the identified phases include Al2O9Si2, SiO2 and Al2O3. After purification of the raw samples, the XRD patterns are dominated by the kaolinite peaks and the main characteristic peaks of kaolinite (12.35 and 24.88 o ) can be clearly observed [42,43,45,46]. The diffraction patterns of the metakaolin samples calcined at 900 o C are shown in fig.…”

Section: X-ray Diffractionmentioning

confidence: 99%

Synthesis of zeolite-A using kaolin samples from Darazo, Bauchi state and Ajebo, Ogun state in Nigeria

Mgbemere¹,

Lawal²,

Ekpe³

et al. 2018

Nig. J. Tech.

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Kaolin samples from Ajebo and Darazo in Nigeria were characterized and used to produce zeolite-A crystals. The thermal analysis indicates that both samples undergo de-hydroxylation from 450 o C to about 700 o C and are converted to metakaolin with a weight loss of about 11.39 and 10.43% for the Ajebo and Darazo samples respectively. Characteristic OH, Al-OH, Si-OH and Si-O-Al bands were confirmed in both samples with Infra-red spectroscopy studies. The X-ray diffraction patterns clearly show the presence of the characteristic peaks (12.35 and 24.88 o ) of kaolinite with little quartz impurities. X-ray diffraction measurements (2Ɵ peaks at 7-18 o and 21-35 o ) and scanning electron micrographs clearly show that zeolite-A crystals are produced. The microstructures of kaolin, metakaolin and zeolite-A crystals reveal the presence of platy crystals, amorphous spherical aggregates and cubic-shaped crystals with some amorphous gel respectively. The results show that both Ajebo and Darazo kaolin are suitable for zeolite-A synthesis.

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“…Thermal treatment lead to loss of water molecules within the kaolin clay structure, which indicates that above 800 o C, total dehydration of the kaolin clay occurs resulting in phase transformation and disruption of kaolin to meta-kaolin amorphous solid that is less prone to acid attack (Chigodo et al, 2015;Panda et al,2010). This process can be represented stochiometrically as: 3SiAl 4 O 14 → 2SiAl 6 O 13 + SiO 2 (1) Similar works (Lori et al, 2007;Ajemba and Onukwuli, 2012) showed that calcined clay at 750 o C exhibited more alumina dissolution rate to those at lower temperature.…”

Section: Effect Of Calcination Temperaturementioning

confidence: 99%

Production and characterization of water treatment coagulant from locally sourced kaolin clays

Kuranga¹,

Alafara²,

Halimah³

et al. 2018

Journal of Applied Sciences and Environmental Management

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ABSTRACT:Base on high cost in coagulant for treating both domestic and industrial water in the recent time.There is need to identify cheaper and efficient methods of removing contaminant as the demand for clean water increases. A study was carried out to investigate the use of locally sourced Kaolinite clay from Okefomo Agbarigidoma, Ilorin south Local Government of Kwara state, for the production of aluminum sulphate using sulphuric acid (H2SO4) solution. The clay sample was beneficiated and calcined at 700 o C for 7 h to obtain meta-kaolin, then later leached using sulphuric acid. The effect of leaching temperature (25-100 o C),period of activation (10-120 minutes),acid concentration(1-6M),particle sizes(50-200µm),acid to clay weight ratio on the leaching were investigated. The optimum leaching conditions for the calcined Kaolin clay were found to be particle size 100µm, acid concentration 5M, leaching temperature 110 o C and leaching time of 90 min. Under optimized condition 68.75% (w/w) aluminum sulphate (alum) was extracted. The result showed that sulphuric acid could be used on a large scale to extract alum from Kaolin clay. The extract alum showed similar structure and physical characteristics compared with commercial alum. A dosage of 38mg/L of the extract alum show effective coagulant properties with a great potential of treating Industrial water.

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Effect of sulphuric acid treatment on the physico-chemical characteristics of kaolin clay

Cited by 327 publications

References 22 publications

Gas Phase Oligomerization of Isobutene over Acid Treated Kaolinite Clay Catalyst

Gas Phase Oligomerization of Isobutene over Acid Treated Kaolinite Clay Catalyst

Synthesis of zeolite-A using kaolin samples from Darazo, Bauchi state and Ajebo, Ogun state in Nigeria

Production and characterization of water treatment coagulant from locally sourced kaolin clays

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