Sodium Hydroxide Activated Nanoporous Carbons Based on Lapsi Seed Stone

Joshi, Sahira; Shrestha, Lok Kumar; Kamachi, Yuichiro; Yamauchi, Yusuke; Pradhananga, Mandira Adhikari; Pokhrel, Bhadra Prasad; Ariga, Katsuhiko; Pradhananga, Raja Ram

doi:10.1166/jnn.2015.9033

Cited by 16 publications

(13 citation statements)

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“…It suggested that, all the ACs are amorphous in nature and the graphite crystallite structure of sugarcane bagasse based ACs is not affected by the impregnation ratio (ZnCl 2 /sugarcane bagasse). The result is similar with the X-ray diffraction pattern of NaOH activated Lapsi seed stone [21].…”

Section: Scanning Electron Microscope (Sem)supporting

confidence: 82%

Synthesis and Characterization of Sugarcane Bagasse Based Activated Carbon: Effect of Impregnation Ratio of ZnCl2

Joshi

Bishnu

2020

J. Nepal Chem. Soc.

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Series of activated carbons (ACs) have been prepared from Sugarcane bagasse powder by ZnCl2 activation at various impregnation ratios of ZnCl2 to Sugarcane bagasse powder of 0.25:1, 0.5:1, 1:1 and 2:1 by weight. Characteristics of the activated carbons (ACs) were determined by iodine number, methylene blue number, surface area, scanning electron microscopy (SEM) and x-ray diffraction. Iodine number (IN) indicated that, microporosity of the AC were increased with increasing impregnation ratio ZnCl2 to Sugarcane bagasse upto 1:1 then started to decrease. However, mesoporosity as well as surface area was increased progressively. The maximum value of iodine number (868 mg/g) was achieved in the AC prepared at impregnation ratio of ZnCl2 to sugarcane bagasse 1:1. SEM micrographs also show the presence of well developed pores on its surface of AC-1. The broad peaks in the XRD patterns indicated that, all the ACs is amorphous materials. From results, it is concluded that ZnCl2 concentration used in impregnation is effective for development of porosity and surface area of the AC prepared from Sugarcane bagasse.

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Section: Scanning Electron Microscope (Sem)supporting

confidence: 82%

Synthesis and Characterization of Sugarcane Bagasse Based Activated Carbon: Effect of Impregnation Ratio of ZnCl2

Joshi

Bishnu

2020

J. Nepal Chem. Soc.

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“…Direct carbonization is performed by mild-or high temperature heat-treatment in which pyrolytic decomposition of the precursor occurs with the elimination of many non-carbon elemental species (H, N, O and S), resulting in the formation of fixed carbonaceous char with porous structure. On the other hand, activation processes can be either physical or chemical [10][11][12]. Physical activation includes two-step processes involving carbonization of the precursor material, followed by gasification of the char at elevated temperatures between 800 to 1100 • C using oxidants such as steam, carbon dioxide, air, or the mixture of these gases [13].…”

Section: Introductionmentioning

confidence: 99%

Rice Husk-Derived High Surface Area Nanoporous Carbon Materials with Excellent Iodine and Methylene Blue Adsorption Properties

Shrestha

Thapa

Shrestha

et al. 2019

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Iodine and methylene blue adsorption properties of the high surface area nanoporous carbon materials derived from agro-waste and rice husk is reported. Rice husk was pre-carbonized at 300 °C in air followed by leaching out the silica nanoparticles by extraction with sodium hydroxide solution. The silica-free rice husk char was mixed with chemical activating agents sodium hydroxide (NaOH), zinc chloride (ZnCl2), and potassium hydroxide (KOH) separately at a mixing ratio of 1:1 (wt%) and carbonized at 900 °C under a constant flow of nitrogen. The prepared carbon materials were characterized by scanning electron microscopy (SEM), Fourier transformed-infrared spectroscopy (FT-IR), powder X-ray diffraction (pXRD), and Raman scattering. Due to the presence of bimodal micro- and mesopore structures, KOH activated samples showed high specific surface area ca. 2342 m2/g and large pore volume ca. 2.94 cm3/g. Oxygenated surface functional groups (hydroxyl, carbonyl, and carboxyl) were commonly observed in all of the samples and were essentially non-crystalline porous particle size of different sizes (<200 μm). Adsorption study revealed that KOH activated samples could be excellent material for the iodine and methylene blue adsorption from aqueous phase. Iodine and methylene blue number were ca. 1726 mg/g and 608 mg/g, respectively. The observed excellent iodine and methylene blue adsorption properties can be attributed to the well-developed micro- and mesopore structure in the carbon material. This study demonstrates that the agricultural waste, rice husk, and derived nanoporous carbon materials would be excellent adsorbent materials in water purifications.

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“…The band at 1300-1000 cm -1 may be probably due to the C-O-C lactone structure, the stretching C-O vibrations of phenol structures and ethers, and the bending O-H modes of phenol structures. Similarly, the band at 1700 cm -1 is attributed due to the presence of C=O stretching (Joshi et al, 2014). BET Surface Area BET surface area WAC-Na 2 CO 3 was found to be 10.45m 2 /g, which is considered to be small.…”

Section: Fig 3 Ftir Spectra Of Wac-na 2 Comentioning

confidence: 90%

Preparation and Characterization of Activated Carbon from Waste Sawdust from Saw Mill

Shrestha

Gyawali

Rajbhandari

2018

J. Inst. Sci. Tech.

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Activated carbon was prepared in laboratory using waste sawdust powder of Shorea robusta (Sal) from saw mill by chemically activated Na2CO3 followed by carbonization technique. Thus prepared activated carbon was characterized by Iodine Number (IN) and Methylene Blue Number (MBN). Iodine number was found to be 534.6 mg/g whereas MBN was found to be 196.08 mg/g which indicated the presence of micropores as well as mesopores in the prepared material. This was also exposed by SEM image. Specific surface area was measured by BET method and was found to be 10.01 m2/g. Then phase state of samples was determined by X-ray diffraction (XRD), which indicated the amorphous nature of the prepared material. The development of surface functionality due to activation was examined by Fourier Transform Infrared Spectroscopy (FTIR) which showed the presence of oxygenated functional groups such as ether, diketone, lactone, phenol on the material. These functional groups are considered to be electrochemically active and contribute to the capacitance of electrical double layer capacitance (EDLC). Further, electrochemical characterization of prepared material was carried out by conductivity test and cyclic voltammetry. The cyclic voltametric curve showed symmetric rectangular shape indicating electrical double layer capacitive behavior. Journal of Institute of Science and TechnologyVolume 22, Issue 2, January 2018, Page: 103-108

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Sodium Hydroxide Activated Nanoporous Carbons Based on Lapsi Seed Stone

Cited by 16 publications

References 0 publications

Synthesis and Characterization of Sugarcane Bagasse Based Activated Carbon: Effect of Impregnation Ratio of ZnCl2

Synthesis and Characterization of Sugarcane Bagasse Based Activated Carbon: Effect of Impregnation Ratio of ZnCl2

Rice Husk-Derived High Surface Area Nanoporous Carbon Materials with Excellent Iodine and Methylene Blue Adsorption Properties

Preparation and Characterization of Activated Carbon from Waste Sawdust from Saw Mill

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