scholarly journals Adsorption properties of nickel-based magnetic activated carbon prepared by Pd-free electroless plating

BioResources ◽  
2010 ◽  
Vol 6 (1) ◽  
pp. 70-80
Author(s):  
Boyang Jia ◽  
Ling Su ◽  
Guangqian Han ◽  
Guangping Wang ◽  
Jian Zhang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Electroless Plating ◽  
Pore Volume ◽  
Specific Area ◽  
Magnetic Activated Carbon ◽  
Before And After ◽  
Plating Solution ◽  
Coconut Shell Activated Carbon ◽  
Solution Volume

Nickel-based magnetic activated carbon was synthesized from coconut shell activated carbon by electroless plating with palladium-free activation. The effect of plating solution volume on metallic ratio and adsorption capacity were evaluated. The effect of metallic ratio on specific area, pore volume, and magnetic properties were investigated. The morphologies of activated carbon before and after plating were observed by SEM, and the composition of the layer was analyzed by EDS analysis. The results showed that the metallic ratio was increased with the increase of the plating solution volume. The magnetic activated carbon showed high adsorption capacity for methylene blue and a high iodine number. Those values reached 142.5 mg/g and 1035 mg/g, respectively. The specific area and pore volume decreased from 943 m2/g to 859 m2/g and 0.462 ml/g to 0.417 ml/g, respectively. And the layer was more compact and continuous when the metallic ratio reached 16.37 wt.%. In the layer, there was about 97 wt.% nickel and 3 wt.% phosphorus, which indicates that the layer was a low-phosphorus one. At the same time, magnetism was enhanced, making the product suitable for some special applications.

Study of the Porous Structure and High Adsorption Capacity of Biomass-Based Activated Carbon Prepared from Aspen Wood by Ferric Nitrate III Activation

2021 ◽  
Vol 15 (2) ◽  
pp. 131-144
Author(s):  
Chunjiang Jin ◽  
Huimin Chen ◽  
Luyuan Wang ◽  
Xingxing Cheng ◽  
Donghai An ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Specific Surface ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Mass Ratio ◽  
Aspen Wood ◽  
Surface Functional Groups ◽  
Wood Sawdust

In this study, aspen wood sawdust was used as the raw material, and Fe(NO3)3 and CO2 were used as activators. Activated carbon powder (ACP) was produced by the one-step physicochemical activation method in an open vacuum tube furnace. The effects of different mass ratios of Fe(NO3)3 and aspen wood sawdust on the pore structure of ACP were examined under single-variable experimental conditions. The mass ratio was 0–0.4. The detailed characteristics of ACP were examined by nitrogen adsorption, scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The adsorption capacity of ACP was established by simulating volatile organic compounds (VOCs) using ethyl acetate. The results showed that ACP has a good nanostructure with a large pore volume, specific surface area, and surface functional groups. The pore volume and specific surface area of Fe-AC-0.3 were 0.26 cm3/g and 455.36 m2/g, respectively. The activator played an important role in the formation of the pore structure and morphology of ACP. When the mass ratio was 0–0.3, the porosity increased linearly, but when it was higher than 0.3, the porosity decreased. For example, the pore volume and specific surface area of Fe-AC-0.4 reached 0.24 cm3/g and 430.87 m2/g, respectively. ACP presented good VOC adsorption performance. The Fe-AC-0.3 sample, which contained the most micropore structures, presented the best adsorption capacity for ethyl acetate at 712.58 mg/g. Under the action of the specific reaction products nitrogen dioxide (NO2) and oxygen, the surface of modified ACP samples showed different rich C/O/N surface functional groups, including C-H, C=C, C=O, C-O-C, and C-N.

Effect of valence of copper on adsorption of dimethyl sulfide from liquid hydrocarbon streams on activated bentonite

2014 ◽  
Vol 68 (1) ◽  
Author(s):  
Huan Huang ◽  
De-Zhi Yi ◽  
Yan-Nan Lu ◽  
Xiao-Lin Wu ◽  
Yun-Peng Bai ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Pore Volume ◽  
Dimethyl Sulfide ◽  
Total Pore Volume ◽  
Nitrogen Adsorption ◽  
Copper Cation ◽  
Liquid Hydrocarbon ◽  
Activated Bentonite ◽  
Better Than

AbstractSamples of activated bentonite and activated bentonite modified with CuCl and CuCl2, separately, were tested as dimethyl sulfide (DMS) adsorbents. The adsorption and desorption behaviours of DMS on the adsorbents were studied systematically. The adsorbents were characterised by nitrogen adsorption, XRD, and DMS-TPD tests. The addition of CuCl and CuCl2 to the activated carbon significantly enhanced the adsorption capacity of DMS, despite a notable decrease in the specific surface area and total pore volume of the activated bentonite. It is presumed that copper cation species may act as an adsorption site for DMS. The adsorption capacity of Cu(II)-bentonite was better than that of Cu(I)-bentonite. The DMS-TPD patterns indicate that the stronger electrophilicity of Cu(II) compared to that of Cu(I) caused it to interact with the DMS molecules more strongly, thus contributing to a better adsorptive performance. The Cu(II)-bentonite calcined at 150°C had the best DMS removal performance with a high sulphur capacity of 70.56 mg S g−1 adsorbent. The DMS removal performance became much lower with the increase in the calcination temperature, which appeared to be due to the decrease in the CuCl2·2H2O phase and the formation of the monoclinic Cu(OH)Cl phase.

The Study on Moisture Adsorption of Oxidized Activated Carbon

2012 ◽  
Vol 581-582 ◽  
pp. 233-237
Author(s):  
Kang Wang ◽  
Wei Long Wang ◽  
Jian Feng Lu ◽  
Jing Ding
Keyword(s):  
Activated Carbon ◽  
Water Vapor ◽  
Specific Surface ◽  
Adsorption Capacity ◽  
Room Temperature ◽  
Specific Area ◽  
Water Vapor Adsorption ◽  
Clean Coal ◽  
Moisture Adsorption ◽  
Oxidized Activated Carbon

Activated carbon made by clean coal and 25% coconut shell was selected to be modified with different concentrations’ HNO3. The productions were characterized by BET, XPS, FTIR and the moisture adsorption of performance is investigated by the DVSA-STD dynamic vapor analyzer. The results show that specific surface area of the activated carbon modified by the 10% concentration of HNO3 is improved 1.3 times than the unmodified one. By comparison the higher concentrations of HNO3 have weaker effects on the specific area of activated carbon. The water vapor adsorption capacity of activated carbon modified by HNO3 at 10% concentration is 1.5 times higher than the unmodified at room temperature at30% RH.

scholarly journals Phenol Removal from Aqueous Solution by Adsorption Technique Using Coconut Shell Activated Carbon

2021 ◽  
Vol 1 (2) ◽  
pp. 98-107
Author(s):  
Zhi Hoong Ho ◽  
Liyana Amalina Adnan
Keyword(s):  
Activated Carbon ◽  
Second Order ◽  
Coconut Shell ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Phenol Removal ◽  
Agriculture Waste ◽  
Before And After ◽  
Elovich Equation ◽  
Coconut Shell Activated Carbon

Adsorption is one of the simplest techniques with low economic requirements. Coconut shell is an abundant agriculture waste which is inexpensive and easy to be obtained in Malaysia. This agriculture waste was transformed to activated carbon via 600°C of carbonization and zinc chloride activation. The ability of coconut shell-based activated carbon to remove phenolic compounds from aqueous solutions was evaluated. From the experiment, the equilibrium time for the adsorption of phenol onto coconut shell-based activated carbon is 120 minutes. The effect of the operating parameters, such as contact time, initial concentration, agitation speed, adsorbent dosage, and pH of the phenolic solution were studied. Adsorption kinetics models (pseudo-first-order, pseudo-second-order, and Elovich equation) and isotherm models (Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich) were used to fit the experimental data.Pseudo-second-order was found to be the best fitted kinetics model to describe the adsorption of phenol on coconut shell-based activated carbon. While the equilibrium experiment data was well expressed by the Temkin isotherm model, The maximum adsorption capacity is determined as 19.02 mg/g, which is comparatively lower than the previous research. Meanwhile, 92% of removal efficiency was achieved by a dosage of 10g/L. Meanwhile, the adsorption of phenol by activated carbon was more favorable under acidic conditions. The favourable isotherm behavior was indicated by the dimensionless separation factor. The functional group and compound class of activated carbon before and after the experiment were determined through the analysis of Fourier-transform infrared (FTIR) spectroscopy.

Assessment of the adsorption capacity of phenol on magnetic activated carbon

2021 ◽  
Author(s):  
Degival Rodrigues Gonçalves Júnior ◽  
Paulo Cardozo Carvalho Araújo ◽  
André Luis Gomes Simões ◽  
Fernando Augusto Pedersen Voll ◽  
Marcela Prado Silva Parizi ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Magnetic Activated Carbon

Preparation and Characterization of Magnetic Coal-Based Activated Carbon in the Presence of Fe3O4

2011 ◽  
Vol 393-395 ◽  
pp. 1355-1358 ◽  
Author(s):  
Jun Zhang
Keyword(s):  
Magnetic Properties ◽  
Activated Carbon ◽  
Surface Area ◽  
Pore Volume ◽  
High Surface ◽  
High Surface Area ◽  
Vibrating Sample Magnetometer ◽  
N2 Adsorption ◽  
Magnetic Activated Carbon

Magnetic coal-based activated carbon was prepared from Taixi anthracitic coal in the presence of magnetite (Fe3O4). The magnetic activated carbon samples were characterized by N2 adsorption, XRD, FTIR and vibrating sample magnetometer (VSM). It was found that the magnetic activated carbon had a high surface area of 993.5 m2/g with 4% Fe3O4 and a saturation magnetization of 2.4158 emu/g for magnetic separability. The results showed that the magnetic properties of MAC are provided by Fe3O4 and Fe. In the presence of Fe3O4, the rate of carbonization and activation increase to form a large surface area and a high pore volume. Moreover, the addition of Fe3O4 can greatly promote the number of both micro-pores and meso-pores in activated carbon.

scholarly journals Synergy Effect of Nitrogen and Molybdenum on Activated Carbon Matrix for Selective Adsorptive Desulfurization: Insights into Surface Chemistry Modification

2021 ◽  
Author(s):  
Musa O Azeez ◽  
Abdulkadir Tanimu ◽  
Khalid Alhooshani ◽  
Saheed A. Ganiyu
Keyword(s):  
Activated Carbon ◽  
Surface Chemistry ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Photoelectron Spectroscopy ◽  
Pore Volume ◽  
Carbon Surface ◽  
Synergy Effect ◽  
Adsorptive Desulfurization ◽  
X Ray

Abstract This study reports the synthesis of mesoporous metal-modified nitrogen doped activated carbon (AC-N-Mo) from date seeds by ZnCl2 activation and its applicability for selective adsorptive desulfurization of dibenzothiophene (DBT). The AC-N-Mo exhibits higher adsorption capacity for DBT at 100 mg-S/L with the maximum value of 99.7% corresponding to 19.94 mg-S/g at room temperature than the unmodified carbon with 17.96 mg-S/g despite its highest surface area and pore volume of 1027 m2g− 1 and 0.55 cm3g− 1 respectively. The adsorption capacity breakthrough follows the order AC-N-Mo > AC-Mo > AC > AC-N. AC-N-Mo also displayed excellent selectivity in the presence of aromatics (toluene, naphthalene and 1-methylisoquinoline). The enhancement in the DBT uptake capacities of AC-N-Mo is attributed to synergy effect of nitrogen heteroatom that aid well dispersion of molybdenum nanoparticles on carbon surface thereby improving its surface chemistry and promising textural characteristics. The kinetic studies showed that the DBT adsorption proceeds via pseudo-second order kinetics while the isotherm revealed that both Freundlich and Langmuir fit the data but Freundlich fit the data more accurately for the best performing adsorbent. The physico-chemical properties (surface area, pore volume, carbon content, particle size etc.) of as-prepared adsorbents namely; AC, AC-N, AC-N-Mo and AC-Mo were characterized by N2- physisorption, X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Scanning Electron Spectroscopy/Energy Dispersive Spectroscopy (SEM/EDS), Raman Spectroscopy (RS), Fourier Transform Infrared Spectroscopy (FTIR) and Ammonia-Temperature-Programmed Desorption (NH3-TPD).

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