Manganese-modified activated carbon fiber (Mn-ACF): Novel efficient adsorbent for Arsenic

Sun, Zengqing; Yu, Yichang; Pang, Shiyu; Du, Dongyun

doi:10.1016/j.apsusc.2013.07.031

Cited by 48 publications

(18 citation statements)

References 24 publications

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“…Dou et al [12] and Chen et al [13] used Fe-cerium (Ce) binary oxide as an adsorbent for As(V) removal, which also exhibited a satisfactory performance. Sun et al [14] found that the As(V) adsorption capacity of activated carbon fiber could be improved by the modification with MnO 2 , which This article was published online on 22 January 2015. Sun et al [14] found that the As(V) adsorption capacity of activated carbon fiber could be improved by the modification with MnO 2 , which This article was published online on 22 January 2015.…”

Section: Introductionmentioning

confidence: 99%

Characteristics and mechanisms of arsenate adsorption onto manganese oxide‐doped aluminum oxide

Liu

Xue

et al. 2015

Env Prog and Sustain Energy

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This study focused on the characteristics and mechanisms of arsenate [As(V)] adsorption onto manganese oxide‐doped aluminum oxide. The adsorbent surface was characterized via the Brunauer–Emmett–Teller method, scanning electron microscopy, energy‐dispersive spectroscopy, and X‐ray diffraction. The characterization results indicated a rough and Al‐enriched surface, a surface area of 91.2 m2/g, and an amorphous structure for manganese oxide‐doped aluminum oxide. Most of the As(V) was adsorbed within 1.5 h, and the kinetics data were described well by the pseudo‐second‐order model. Meanwhile, the adsorption process was controlled by more than one rate‐limiting step. The Langmuir model fitted the isotherm data better compared with the Freundlich model, and the maximum adsorption amount was 114.5 mg/g at T = 298 K. The As(V) adsorption was an endothermic and spontaneous process. The optimal As(V) removal was achieved at a pH range of 4.0–6.0. Furthermore, the results of Fourier transform infrared spectroscopy and X‐ray photoemission spectroscopy suggested that As(V) adsorption was primarily through the adhesion to the surface hydroxyl groups and ligand exchange with the sulfate. © 2015 American Institute of Chemical Engineers Environ Prog, 34: 1009–1018, 2015

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Section: Introductionmentioning

confidence: 99%

Characteristics and mechanisms of arsenate adsorption onto manganese oxide‐doped aluminum oxide

Liu

Xue

et al. 2015

Env Prog and Sustain Energy

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“…The positive enthalpy values of CF–Fe samples supported the endothermic nature whereas As (V) adsorption onto the raw CF follows an exothermic path (ΔH° = −10.48 kJ/mol). According to Sun et al, such behavior indicates that more molecules achieved sufficient energy to interact with the surface active sites with rising temperature. Increased temperature might be responsible for swelling effect of the porous structure, which enables As (V) molecules to penetrate deeper into pores.…”

Section: Resultsmentioning

confidence: 99%

“…To date, several adsorbents such as activated carbons, activated alumina, metallic oxides, ion exchange resins, and biological materials have been reported for As removal from water. Carbon fibers (CFs)‐based sorbents constitute a promising technology towards various pollutants due to their fast adsorption kinetics, large surface area, excellent stability, decreased flow resistance, appropriate mechanical, and other advantageous properties . Sun et al studied the arsenic adsorption properties of manganese‐modified activated CFs (ACFs) and found the adsorption capacity as 23.77 mg/g at 303 K. Zhang et al impregnated magnetite to the surface of commercial ACF supported onto chitosan.…”

Section: Introductionmentioning

confidence: 99%

Novel composite sorbents based on carbon fibers decorated with ferric hydroxides—Arsenic removal

Şimşek

Novak

Berek

et al. 2018

Asia-Pacific J Chem Eng

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Carbon fibers (CF) were prepared by carbonization of cellulose and further deposited with ferric hydroxide (CF–Fe). The synthesized CF and CF–Fe composites were employed to remove arsenate from aqueous solution. CF–Fe samples with different amount of Fe (3, 7, 11, and 20 wt.%) were characterized using SEM‐EDX, XPS, FTIR, BET, pH titration, and zeta potential measurements. Batch isotherm studies were performed to determine the As (V) adsorption performance of both raw CF and CF–Fe. CF–Fe composites exhibited significantly higher As (V) adsorption capacity compared with raw CF, namely, 167.95 versus 412.8 μg/g and for raw CF and CF–Fe (3%), respectively. The presence of Cl− and SO42− only slightly affected the As (V) adsorption, whereas competitive adsorption displayed the highest influence of PO43−, followed by F− and CO32−. The results revealed that both coulombic interactions and surface complexation reactions play important role in the As (V) adsorption process.

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“…Among a wide range of activation methods, chemical activation is an effective and simple method to prepare activated carbons with a high specific surface area. Depending on the chemical agents used, chemical activation can lead to unique pore structures [1][2][3].CO gas detection has recently become a critical issue because CO is one of the most common air pollutants. Pollutant CO gas is produced by incomplete hydrocarbon burning and accompanies almost all combustion processes.…”

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confidence: 99%

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Pore structure control of activated carbon fiber for CO gas sensor electrode

Bai¹,

배태성²

2016

Carbon letters

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Materials with porous structures developed in previous research have been used extensively in industrial purification and chemical recovery operations due to their large specific surface areas and pore volumes. Among a wide range of activation methods, chemical activation is an effective and simple method to prepare activated carbons with a high specific surface area. Depending on the chemical agents used, chemical activation can lead to unique pore structures [1][2][3].CO gas detection has recently become a critical issue because CO is one of the most common air pollutants. Pollutant CO gas is produced by incomplete hydrocarbon burning and accompanies almost all combustion processes. CO is especially dangerous because it possesses no odor or color and is therefore undetectable by humans. CO gas also becomes explosive at concentrations above 12% and has a threshold limit value of 25 ppm. Vehicle exhaust is a major source of environmental CO emissions and contributes to smog formation. Thus, the development of highly selective and stable CO sensors is an important goal and will assist in the study of environmental impacts. Motivated by the increasingly strict laws for different pollutant sources, recently there has been rapid progress in the fabrication of sensors to detect and monitor the environment, and several types of gas sensors have been reported in the literature [4][5][6][7][8][9].In this study, carbon based materials were used to fabricate a gas sensor matrix by electrospinning and heat treatment. To improve the sensitivity of the sensor by enhancing the gas adsorption, a porous structure was developed using chemical activation. The gas sensing mechanism was discussed based on the carbon pore structure.A polymer solution was prepared by dissolving polyacrylonitrile (PAN; d = 1.184, 181315 Aldrich, USA) in N,N-dimethyl formamide (DMF; d = 133, 766137 Fisher, USA). Electrospun fibers were obtained from the polymer solution using the electrospinning method. The electrospinning process was carried out under the following conditions: 0.8 mL/h polymer solution feed rate, 13 kV supplied voltage, 12 cm tip to collector distance, and 120 rpm collector rotation. The electrospun materials were stabilized by heating up to 523 K in air at a heating rate of 3 K min -1 , followed by treatment of the samples at 523 K for 3 h. Carbonization of the stabilized electrospun materials was carried out under an argon atmosphere with the following conditions: 15 K/min heating rate, 1273 K reaction temperature, 1 h holding time, and a 50 mL/h argon feed rate. The prepared sample was named CF.H 3 PO 4 solutions (1, 2, 3, and 4 M) were prepared as chemical activation agents. The CF was placed in an alumina boat in a steel pipe at a ratio of 20 mL/g (H 3 PO 4 solution/CF) to carry out the chemical activation. Activation was conducted at 1023 K for 2 h in an argon atmosphere. The heating rate was 5 K/min and the feed rate of the argon gas was 30 mL/min. Following the chemical activation, the obtained samples were washed several time...

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Manganese-modified activated carbon fiber (Mn-ACF): Novel efficient adsorbent for Arsenic

Cited by 48 publications

References 24 publications

Characteristics and mechanisms of arsenate adsorption onto manganese oxide‐doped aluminum oxide

Characteristics and mechanisms of arsenate adsorption onto manganese oxide‐doped aluminum oxide

Novel composite sorbents based on carbon fibers decorated with ferric hydroxides—Arsenic removal

Pore structure control of activated carbon fiber for CO gas sensor electrode

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