Characterization of Allophane from Gamalama Volcanic Soil, North Maluku, Indonesia

Cipta, Indra; Limatahu, Nur Asbirayani; Abu, St. Hayatun Nur; Kartini, Indriana; Arryanto, Yateman

doi:10.14233/ajchem.2017.20620

Cited by 3 publications

(5 citation statements)

References 11 publications

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“…Gamalama eruptions can produce tons of volcanic ash that is a natural material thrown into the air. Gamalama volcanic ash had been characterized, and FTIR data report that it has many functional groups of the mineral silica and confirmed the presence of albite, cristoballite, and coesite by XRD results [7].…”

Section: Introductionmentioning

confidence: 80%

“…Based on an XRD analysis conducted by [7], it is known that the type of minerals in Gamalama volcanic ash that is quartz, cristobalite, kaolinite-smectite and albite. The same phenomena were reported [13].…”

Section: Xrd Characterizationmentioning

confidence: 99%

“…It was [6] who reported nitrate removal by using carbon activated with an adsorption capacity of nitrate was 0.38 mmol/g. Using zeolite modified to remove nitrate from water, [7] reported that the zeolite modified chitosan has an adsorption capacity of 0.74 mmol/g. However, carbon adsorbents and natural materials (zeolite and clay) to be applied in the city of Ternate have obstacles because it is highly cost to use activated carbon in Ternate City.…”

Section: Introductionmentioning

confidence: 99%

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Nitrate Adsorption capacity of Activated Gamalama Volcanic Ash

Zam

Limatahu

Baturante

2021

JKPK

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<p>The adsorption process of nitrate from an aqueous solution by using activated Gamalama volcanic ash was investigated. Gamalama volcanic ash (VA) was activated with HNO3 2M. The effect of adsorbent mass and initial nitrate concentration on nitrate adsorption were observed in this study. The adsorption process was conducted using a various mass of adsorbent (1 g, 2 g, 4 g, 6 g, and 8 g), various initial concentrations of nitrate (20 mg/L, 30 mg/L,40 mg/L, 50 mg/L, and 60 mg/L). The increasing of adsorbent mass decreased the adsorption capacity was observed. It was also found that the increase in initial concentration increased the adsorption capacity. The highest nitrate adsorption capacity showed by 1 gram adsorbent for 0.167 mg/g, and at nitrate initial concentration 80 mg/L, for 1.831 mg/g. Adsorption isotherm of nitrate on activated VA was determined and figured. These isotherms were modelled according to Freundlich and Langmuir adsorption isotherm.</p>

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Section: Introductionmentioning

confidence: 80%

Section: Xrd Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nitrate Adsorption capacity of Activated Gamalama Volcanic Ash

Zam

Limatahu

Baturante

2021

JKPK

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“…Cipta et al [11] have reported the separation of allophane from the volcanic soil of mount Gamalama volcano. The allophane from the volcanic soil of mount Gamalama is shaped like an irregular ball, with a constituent mineral in the form of silicaalumina and has surface of area 125.158 m 2 g -1 [11,12] is possible to use as an adsorbent because it has large surface area.…”

Section: Introductionmentioning

confidence: 99%

“…The allophane from the volcanic soil of mount Gamalama is shaped like an irregular ball, with a constituent mineral in the form of silicaalumina and has surface of area 125.158 m 2 g -1 [11,12] is possible to use as an adsorbent because it has large surface area. The nanocomposite bismuth oxyiodide (BiOI)-allophane from the volcanic soil of mount Gamalama has the ability to absorb visible light [12].…”

Section: Introductionmentioning

confidence: 99%

Adsorption and Photodegradation of Methylene Blue by Allophane and Nanocomposite Bismuth Oxyiodide-Allophane

Limatahu¹,

Cipta²,

Abu³

et al. 2017

Asian J. Chem.

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This study examines the ability of allophane as an adsorbent and photocatalytic capability of nanocomposite bismuth oxyiodide (BiOI)-allophane in removal of methylene blue dye. Adsorption was performed by using 50 mg of allophane from volcanic soil of mount Gamalama. The adsorption results showed that the optimum contact time is 10 min with adsorption percentage 91.81%. The percentage of adsorption decreases with increasing contact time and reaches equilibrium at about in 120 min. The initial concentration of methylene blue has an effect on the adsorption percentage. This is evidenced by the increased adsorption percentage of 73.35, 78.78, 82.12, 87.81 %, respectively for concentrations of 20, 50, 80 and 100 ppm. The photodegradation test results showed an excellent photocatalytic ability of BiOI-allophane composites. Using direct sunlight for 45 min, the percentage of photodegradation is 99.46 %. Increased contents of allophane in BiOI-allophane nanocomposite increases the photocatalytic ability.

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Identification and Characterization of Nanoclays in Gamalama Volcanic Soil of Northern Maluku

Cipta

Febiyanto

Syoufian

et al. 2022

Clays and clay miner.

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Clay minerals in Gamalama volcanic soil have not yet been identified thoroughly. The soil is estimated to contain nanoscale natural clays, such as halloysite or imogolite. The occurrence of nanoclays in the soil will support the development of many applications in nanotechnologies from nature. The objective of the present study was to characterize soil samples from five different locations around the volcano at three different depths from the soil surface. A total of 50 g of dry soil sample was stirred slowly in 300 mL of distilled water. Stirring was stopped after the addition of 10 mL of 30% H2O2 and then allowed to stand for 24 h. The small floating particles with dimensions of <2 μm were separated from the mixture and collected using a centrifuge at 4000 rpm (1790×g) for 30 min. About 5 g of solid sample was obtained for further characterization. X-ray diffraction results showed the presence of halloysite, allophane, and kaolinite. Morphology analysis by scanning and transmission electron microscopy of some representative samples showed short tubes 10–20 nm in diameter and 50–100 nm long with the halloysite structure. Halloysite was found at 70 cm depth from the soil surface at almost all locations. The surface area determined by the surface area analyzer using the BET equation was as much as 112.51 m2/g. This surface area is thought to be the largest ever determined for a natural nanoclay, paving the way for future application as catalytic or photocatalytic-supporting materials.

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Characterization of Allophane from Gamalama Volcanic Soil, North Maluku, Indonesia

Cited by 3 publications

References 11 publications

Nitrate Adsorption capacity of Activated Gamalama Volcanic Ash

Nitrate Adsorption capacity of Activated Gamalama Volcanic Ash

Adsorption and Photodegradation of Methylene Blue by Allophane and Nanocomposite Bismuth Oxyiodide-Allophane

Identification and Characterization of Nanoclays in Gamalama Volcanic Soil of Northern Maluku

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