Preparation of activated carbons from cotton stalk by microwave assisted KOH and K2CO3 activation

Deng, Hui; Li, Guoxue; Yang, Haichuan; Tang, Jiping; Tang, Jiangyun

doi:10.1016/j.cej.2010.08.019

Cited by 374 publications

(132 citation statements)

References 48 publications

(60 reference statements)

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“…6) because the principal bands of silicon compounds of pumice were identified at 460 and *800 cm -1 and a strong peak around 1,047 cm -1 , which can be associated with the Si-O bending strength vibrations and the Si-O stretching vibrations (Ersoy et al 2010). Also, a broadband located at 3,423 cm -1 was observed, which corresponds to O-H stretching vibration in hydroxyl functional groups, and the band at 2,922 cm -1 and its shoulder at 2,856 cm -1 could be attributed to mC-H and dC-H (m = stretching and d = bending) absorption bands that may be associated with methyl and methylene groups (Deng et al 2010;Tian et al 2011). The band at 1,630 cm -1 can be attributed to C=O vibrations of ketones, aldehydes or carboxylic acids.…”

Section: Characterization Of Denim Fiber Scrapsmentioning

confidence: 90%

Removal of heavy metals and arsenic from aqueous solution using textile wastes from denim industry

Mendoza-Castillo

Rojas-Mayorga

García-Martínez

et al. 2014

Int. J. Environ. Sci. Technol.

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In this study, the denim fiber scraps were reused as an alternative low-cost sorbent for the removal of heavy metals Pb 2? , Cd 2? , Zn 2? and arsenic from aqueous solutions. Results showed that this textile waste was an effective sorbent for the removal of these heavy metal ions and offered a better removal performance than those reported for other synthetic and natural sorbents such as activated carbons and zeolites. On the other hand, raw and metal-loaded denim wastes were also useful for the removal of arsenic (V) from aqueous solutions and their sorption capacities were higher than 1.5 mg/g. In particular, the presence of Pb 2? ions on the surface of denim wastes improved significantly its arsenic (V) sorption performance. In summary, the reuse of denim textile wastes in wastewater treatment can be considered as an eco-friendly application that could be useful for waste management and also for reducing the production costs in this important industrial sector.

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Section: Characterization Of Denim Fiber Scrapsmentioning

confidence: 90%

Removal of heavy metals and arsenic from aqueous solution using textile wastes from denim industry

Mendoza-Castillo

Rojas-Mayorga

García-Martínez

et al. 2014

Int. J. Environ. Sci. Technol.

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“…The reason for this may be due to the overlapping of the peaks for K with the peaks for the (100), (101) plane of carbonaceous materials. A gasification reaction occurred during the KOH activation process in which KOH was converted to either K metal or K 2 CO 3 [44]. Potassium metal remains in the final…”

Section: Crystallographic Analysis Of the Activated Carbonmentioning

confidence: 99%

Adsorption capability of activated carbon synthesized from coconut shell

Islam¹,

Ang²,

Gharehkhani³

et al. 2016

Carbon letters

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Activated carbon was synthesized from coconut shells. The Brunauer, Emmett and Teller surface area of the synthesized activated carbon was found to be 1640 m 2 /g with a pore volume of 1.032 cm 3 /g. The average pore diameter of the activated carbon was found to be 2.52 nm. By applying the size-strain plot method to the X-ray diffraction data, the crystallite size and the crystal strain was determined to be 42.46 nm and 0.000489897, respectively, which indicate a perfect crystallite structure. The field emission scanning electron microscopy image showed the presence of well-developed pores on the surface of the activated carbon. The presence of important functional groups was shown by the Fourier transform infrared spectroscopy spectrum. The adsorption of methyl orange onto the activated carbon reached 100% after 12 min. Kinetic analysis indicated that the adsorption of methyl orange solution by the activated carbon followed a pseudo-second-order kinetic mechanism (R 2 > 0.995). Therefore, the results show that the produced activated carbon can be used as a proper adsorbent for dye containing effluents.

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“…At low microwave energy, the pore structure was not satisfactorily created which improved with the expanding of microwave power. Nevertheless, at tremendous radiation power, absorbed MW energy eclipse at some of power so that the overfull energy keep create a small feature of carbon burnt and the structure was destroyed [16]. …”

Section: Resultsmentioning

confidence: 99%

Characterization of Activated Carbon Using Chemical Activation via Microwave Ultrasonic System

2017

MJAS

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Higher adsorption capacities of activated carbon (AC) can be evaluate according to pore volume, porosity and surface area. AC with higher pore volume, porosity and surface area desired in the present study in order to enhance the properties of AC supercapacitor. Thus, the present studies focus on the chemical activation process to increase the characterization of AC. The study was using bamboo waste as a precursor and the activation process was conducted using microwave ultrasonic system. The chemical agent used during the process was KOH and H 2 SO 4 . Microwave activation was conducted at intensity 100 W and 300 W for 30 min and sonication frequency was constantly set at 200 Hz for 60 min. The sample was carbonized at temperature of 400 ºC and 800 ºC using furnace for 2 hours. Then, AC was characterized for surface area using BET analysis and functioning group using FTIR analysis. The results shown the carboxyl, aliphatic, aromatic and phenolic hydroxyl group are present on raw bamboo while new functional group such as alkyl halide and some of some weak bands appeared which analogous with out of plane bending mode of the C-H or O-H group occur for AC. Active surface area and total pore volume of AC supercapacitor in 5M of concentration for H 2 SO 4 and KOH corresponded to 1167 m 2 /g, 0.724 cm 3 /g, 740.10 m 2 /g, 0.462 cm 3 /g, respectively.Keywords: supercapacitor, microwave-ultrasonic, activation, chemical, carbonization Abstrak Kapasiti penjerapan yang tinggi pada karbon teraktif boleh dinilai mengikut isipadu liang, keliangan dan luas permukaan. Keaktifan karbon dengan isi padu liang yang tinggi, tahap keliangan yang besar dan luas permukaan yang tinggi amat dikehendaki di dalam kajian ini bagi meningkatkan sifat-sifat keaktifan karbon superkapasitor. Oleh itu, kajian ini memberi tumpuan kepada proses pengaktifan kimia untuk meningkatkan pencirian yang diperlukan dalam karbon aktif. Kajian ini telah menggunakan sisa buluh sebagai pelopor dan proses pengaktifan telah dijalankan menggunakan sistem ultrasonik-gelombang mikro. Agen kimia yang digunakan semasa proses pengaktifan adalah KOH dan H 2 SO 4 . Pengaktifan gelombang ketuhar telah digunakan pada intensiti 100 W dan 300 W selama 30 min dan kekerapan sonikasi telah ditetapkan pada 200 Hz selama 60 min. Sampel telah dikarbonisasi pada suhu 400 ºC dan 800 ºC mengunakan relau selama 2 jam. Kemudian, karbon aktif dikelaskan bagi mendapatkan luas permukaan dengan menggunakan analisis BET dan kumpulan berfungsi pula menggunakan analisis FTIR. Keputusan menunjukkan karboksil aliphatik, aromatik dan kumpulan fenolik hidrosil hadir pada bahan asas buluh manakala kumpulan berfungsi baharu seperti alkil halida dan beberapa kumpulan yang lemah muncul dimana serupa dengan lenturan mod bagi C-H atau O-H yang terhasil pada karbon aktif. Kawasan permukaan yang aktif dan jumlah isipadu liang

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Preparation of activated carbons from cotton stalk by microwave assisted KOH and K2CO3 activation

Cited by 374 publications

References 48 publications

Removal of heavy metals and arsenic from aqueous solution using textile wastes from denim industry

Removal of heavy metals and arsenic from aqueous solution using textile wastes from denim industry

Adsorption capability of activated carbon synthesized from coconut shell

Characterization of Activated Carbon Using Chemical Activation via Microwave Ultrasonic System

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