scholarly journals Adsorption Property, Kinetic and Equilibrium Studies of Activated Carbon Fiber Prepared from Liquefied Wood by Zncl2 Activation

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1377 ◽  
Author(s):  
Ruoke Ma ◽  
Xianxian Qin ◽  
Zhigao Liu ◽  
Yunlin Fu
Keyword(s):  
Activated Carbon ◽  
Carbon Fiber ◽  
Adsorption Property ◽  
Chemical Activation ◽  
Activated Carbon Fiber ◽  
Activation Process ◽  
Order Kinetic ◽  
Liquefied Wood ◽  
Zncl2 Activation ◽  
Mb Adsorption

Activated carbon fiber was prepared from liquefied wood by chemical activation with ZnCl2 (Z-LWACF) at different impregnation ratios, with a particular focus on its adsorption property, kinetic and isotherm. The characterization and properties of Z-LWACFs were investigated by nitrogen adsorption/desorption, X-ray photoelectron spectroscopy (XPS), methylene blue (MB) and iodine adsorption. Two activation process methods were employed to prepare Z-LWACF and contrasted with others fibers. The results showed that the Z-LWACF obtained by one-step ZnCl2 activation present higher yields and specific surface area than others fibers. Besides, the change of MB adsorption value at different impregnation ratios was consistent with pore structure distribution above 1.5 nm pore size, indicating that larger micropores (1.5 to 2 nm) and mesopores played a major role in the MB adsorption by Z-LWACF. The kinetics of MB adsorption process was found to follow the pseudo-second-order kinetic model and the adsorption rate was controlled by chemisorption. It was also found that MB adsroption by Z-LWACF belonged to monolayer adsorption and Z-LWACF was easy to adsorb MB.

scholarly journals Adsorption of methylene blue onto betel nut husk-based activated carbon prepared by sodium hydroxide activation process

2020 ◽  
Vol 82 (9) ◽  
pp. 1932-1949
Author(s):  
Mondira Bardhan ◽  
Tamanna Mamun Novera ◽  
Mumtahina Tabassum ◽  
Md. Azharul Islam ◽  
Ali H. Jawad ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Adsorption Capacity ◽  
Chemical Activation ◽  
Maximum Adsorption Capacity ◽  
Activation Process ◽  
Order Kinetic ◽  
Betel Nut ◽  
Non Linear ◽  
Mb Adsorption

Abstract In this study, activated carbon (AC) was prepared from agro-waste betel nut husks (BNH) through the chemical activation method. Different characterization techniques described the physicochemical nature of betel nut husks activated carbon (BNH-AC) through Fourier transform infrared spectroscopy (FTIR), Brunauer–Emmett–Teller (BET), scanning electron microscopy (SEM), and pH point of zero charge. Later, the produced AC was used for methylene blue (MB) adsorption via numerous batch experimental parameters: initial concentrations of MB dye (25–250 mg/L), contact time (0.5–24 hours) and initial pH (2–12). Dye adsorption isotherms were also assessed at three temperatures where the maximum adsorption capacity (381.6 mg/g) was found at 30 °C. The adsorption equilibrium data were best suited to the non-linear form of the Freundlich isotherm model. Additionally, non-linear pseudo-second-order kinetic model was better fitted with the experimental value as well. Steady motion of solute particles from the boundary layer to the BNH-AC's surface was the possible reaction dynamics concerning MB adsorption. Thermodynamic study revealed that the adsorption process was spontaneous and exothermic in nature. Saline water emerged as an efficient eluent for the desorption of adsorbed dye on AC. Therefore, the BNH-AC is a very promising and cost-effective adsorbent for MB dye treatment and has high adsorption capacity.

Effect of Modification with Nitric Acid and Hydrogen Peroxide on Chromium (VI) Adsorption by Activated Carbon Fiber

2012 ◽  
Vol 518-523 ◽  
pp. 2099-2103
Author(s):  
Guang Zhou Qu ◽  
Hai Bing Ji ◽  
Ran Xiao ◽  
Dong Li Liang
Keyword(s):  
Hydrogen Peroxide ◽  
Activated Carbon ◽  
Nitric Acid ◽  
Carbon Fiber ◽  
Adsorption Capacity ◽  
Adsorption Kinetics ◽  
Ph Value ◽  
Activated Carbon Fiber ◽  
Order Kinetic ◽  
Adsorption Amount

The activated carbon fiber (ACF) was treated by different concentration nitric acid (HNO3) and hydrogen peroxide (H2O2) oxidization to enhance its adsorption capacity to hexavalent chromium (Cr6+) ion. The adsorption amount and adsorption kinetics of Cr6+ion on ACFs, and the surface chemical groups were investigated. The results showed that the modified ACFs with 1% HNO3and 10% H2O2had a better adsorption capacity, respectively. The adsorption amount of ACFs was affected strongly solution pH value, and decreased significantly with increasing of the pH value. The adsorption kinetics indicated that the adsorption rates of Cr6+ ion on different modified ACFs were well fitted with the pseudo-second-order kinetic model. After 1% HNO3and 10% H2O2modification, respectively, the total acidic oxygen-containing groups on ACFs surface had an increase obviously, which might be enhance the adsorption amount of Cr6+ion on ACFs.

Organic and Inorganic Acid Activation of Activated Carbon Fiber from Palm Oil Empty Fruit Bunch

2013 ◽  
Vol 858 ◽  
pp. 122-130
Author(s):  
Wee Keat Cheah ◽  
Radzali Othman ◽  
Fei Yee Yeoh
Keyword(s):  
Activated Carbon ◽  
Carbon Fiber ◽  
Palm Oil ◽  
Chemical Activation ◽  
Activated Carbon Fiber ◽  
Raw Material ◽  
Acid Activation ◽  
Empty Fruit Bunch ◽  
Pore Characteristics ◽  
Inorganic Acids

Activated carbon fiber is known to posses better properties compared to granular and powdered variants, with significantly higher surface area and higher pore volume. Source of raw material and activation step are two crucial parameters for the pore development of activated carbon. Palm oil empty fruit bunch fiber contains naturally formed long open channels which offer better access of adsorbates into micropores. Chemical activation step typically involves inorganic acids such as phosphoric acid and sulfuric acid. However, such residues of inorganic acids might create unfavourable conditions for certain adsorption applications, if not removed properly from synthesized activated carbon fiber. Additionally, subsequent to the acid cleaning or removal step, most inorganic acids would eventually cause problems to the environment if acid disposal is not properly managed. This paper investigates on the effect of utilization of organic acids acetic acid and citric acid, as compared to commonly used inorganic acids, on the pore characteristics of palm oil empty fruit bunch fiber derived activated carbon fiber.

scholarly journals Modified Activated Carbon Fiber Felt for the Electrosorption of Norfloxacin in Aqueous Solution

2020 ◽  
Vol 12 (10) ◽  
pp. 3986
Author(s):  
Xianzhen Li ◽  
Yue Hu ◽  
Diao She ◽  
Wei-Bo Shen
Keyword(s):  
Activated Carbon ◽  
Nitric Acid ◽  
Carbon Fiber ◽  
Activated Carbon Fiber ◽  
Order Kinetic ◽  
Human Beings ◽  
Adsorption Effect ◽  
Regeneration Rate ◽  
Modified Activated Carbon ◽  
Carbon Fiber Felt

As an antibiotic, Norfloxacin (NOR) is widely found in the water environment and presents considerable harm to human beings. At present, the preparation of removal materials is complicated, and the removal efficiency is not high. The adsorption effect of modified activated carbon fiber felt (MACFF) electrosorption and its influencing factors on NOR were studied. Activated carbon fiber felt (ACFF) was modified with 20% nitric acid, and the ACFFs were characterized by SEM, TEM, and FTIR both before and after modification. The optimal working conditions for electrosorption with an MACFF electrode were as follows: the voltage was 1.0 V, the pH was 6, and the plate spacing was 10 mm. The maximum adsorption capacity of the MACFF for NOR was 128.55 mg/g. Model fitting showed that pseudo-second-order kinetic model and Langmuir model were more suitable for explaining this adsorption process. In addition, this study found that, with 20% nitric acid as the regeneration liquid and under the reverse charging method, the regeneration rate of the MACFF electrode was maintained at approximately 96% and the regeneration was good, therefore, this technology can not only save operation costs but also has good development prospects in sewage treatment.

Preparation and Properties of Kevlar or Polysulfonamide Pulp Reinforced Activated Carbon Fiber Paper

2015 ◽  
Vol 1120-1121 ◽  
pp. 654-658
Author(s):  
Qi Xia Liu ◽  
Tao Ji ◽  
Qiang Gao ◽  
Li Rong Yao ◽  
Fei Yan Wang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Carbon Fiber ◽  
Adsorption Property ◽  
Activated Carbon Fiber ◽  
Plant Fiber ◽  
Bursting Strength ◽  
Paper Making ◽  
Filtration Performance ◽  
Carbon Fiber Paper ◽  
Better Than

In this paper, Kevlar or Polysulfonamide (PSA) pulp were used to replace plant fiber pulp partially or completely and by adjusting their ratios and a variety of Kevlar or PSA pulp reinforced activated carbon fiber paper (ACFP) were prepared via wet-laid paper making technology. The influences of addition of Kevlar or PSA pulp on the permeability, mechanical property, filtration performance, adsorption property of ACFP were discussed by maintaining the addition content of activated carbon fiber unchanged. Results showed that with the addition content of Kevlar or PSA pulp increased, the permeability and filtration performance of ACFP decreased obviously, while the bursting strength and the static CCl4 adsorption performances were firstly increased and then decreased. Generally, the permeability and filtration performance of Kevlar pulp reinforced ACFP were slightly worse than that of PSA pulp reinforced ACFP, while the bursting strength as well as the static CCl4 adsorption properties of Kevlar pulp reinforced ACFP were better than that of PSA pulp reinforced ACFP.

scholarly journals Bio-Adsorbent Derived from Sewage Sludge Blended with Waste Coal for Nitrate and Methyl Red Removal: Synthesis, Oxidation, Performance and Environmental Consideration

2021 ◽  
Author(s):  
John Longo Masengo ◽  
Jean Mulopo
Keyword(s):  
Activated Carbon ◽  
Sewage Sludge ◽  
Surface Acidity ◽  
Chemical Activation ◽  
Activation Process ◽  
Order Kinetic ◽  
Methyl Red ◽  
Batch Mode ◽  
Ammonium Peroxydisulfate ◽  
Waste Coal

Abstract Low-cost bio-adsorbents were synthesized using two types of sewage sludge: D, which was obtained during the dissolved air flotation stage, and S, which was a mixture of primary and secondary sludge from the digestion and dewatering stages. The sewage sludge was mixed with waste coal before being activated with Potassium Hydroxide (KOH) and oxidized with ammonium persulfate (APS). The nitrate and methyl red removal capacities of the synthesized bio-adsorbents were evaluated and compared to those of industrial activated charcoal. The oxidation surface area of bio-adsorbents derived from sludge S shrank by six fold after modification, while those derived from D only varied narrowly from 312,72 m2/g to 282,22 m2/g, but surface modification had no effect on inorganic composition in either case. The adsorption of nitrate and methyl red (MR) was performed in batch mode, and the removal processes followed the pseudo second order kinetic model and the Langmuir isotherm fairly well. The adsorption capacities of nitrate and MR were higher at pH=2 and pH=4, respectively. The total nitrate Langmuir adsorption potential was DC-5-750 (26,735 mg/g) > commercial activated carbon (Com-AC) (20,61 mg/g) > DC-55-750M1 (17,06 mg/g), and for MR, Com-AC (196,07 mg/g) > DC-5-750M2 (175 mg/g).Statement of Novelty: This paper examines how the chemical structure of activated carbon derived from sewage sludge and blended with waste coal is altered during the chemical activation process to provide the optimal porous surface for nitrate and methyl red adsorptive remediation. The formation of carboxylic sites or the transformation of oxygen sites to carboxylic sites is the aim of the oxidation process of activated carbon in general. Ammonium peroxydisulfate was chosen because of its ability to oxidize the surface without significantly altering the porous structure and increase surface acidity by increasing carboxylic group presence. There are no studies that we are aware of that use ammonium peroxydisulfate to oxidize activated carbon from sewage sludge blended with waste coal

Kinetics of Phenol Adsorption onto Activated Carbon Fiber

2011 ◽  
Vol 356-360 ◽  
pp. 1524-1527
Author(s):  
Mei Li ◽  
Yi Luo ◽  
Ru Chun Wu ◽  
Hong Yu Liang ◽  
Shuang Fei Wang
Keyword(s):  
Activated Carbon ◽  
Carbon Fiber ◽  
Activated Carbon Fiber ◽  
Order Kinetic ◽  
Phenol Adsorption ◽  
First Order ◽  
Adsorption Data ◽  
Pseudo Second Order ◽  
Kinetics Of ◽  
Rate Controlling Step

The adsorption of phenol onto activated carbon fiber (ACF) from aqueous solutions were studied.The adsorption kinetics of phenol by ACF can be described by the Lagergren first-order and pseudo second-order kinetic models, respectively.The Lagergren first-order was verified to be the best to describe the adsorption data. The intraparticle diffusion is not the only rate-controlling step .

Adsorption and Separation Research of CO2/CH4 on Modified Activated Carbon Fiber

2014 ◽  
Vol 986-987 ◽  
pp. 13-16
Author(s):  
Qin Yuan ◽  
Hong Hong Yi ◽  
Xiao Long Tang ◽  
Kai Li ◽  
Fen Rong Li ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Adsorption Property ◽  
Activated Carbon Fiber ◽  
Separation Performance ◽  
Activated Carbon Fibers ◽  
Modified Activated Carbon ◽  
Chemical Reagents ◽  
Modified Adsorbents

In this paper, activated carbon fibers were modified by different chemical reagents. The modified adsorbents were used to investigate adsorption and separation performance of CO2/CH4 gases mixture, and then it could get the best modified adsorbent. The experimental results show that amine can't great grafting on activated carbon fiber. Compared with blank activated carbon fibers, the adsorption property of CO2 did not have much influence on the activated carbon fiber modified by amine. However, it can increase the nitrogen functional groups and the specific surface area on the surface of activated carbon fiber that were modified with nitric acid and ammonia. The above two points were conductive to the adsorption and separation of CO2/CH4 mixture gases.

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