A simple method for the determination of surface area and activity of activated carbon

2009 ◽  
Vol 91 (5) ◽  
pp. 955-962
Author(s):  
I. Adewumi
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
Simple Method

scholarly journals Parabens Adsorption onto Activated Carbon: Relation with Chemical and Structural Properties

Molecules ◽  
2019 ◽  
Vol 24 (23) ◽  
pp. 4313 ◽  
Author(s):  
Astrid Roxanna Moreno-Marenco ◽  
Liliana Giraldo ◽  
Juan Carlos Moreno-Piraján
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Surface Area ◽  
Endocrine Disruptor ◽  
Emerging Contaminants ◽  
Activated Carbons ◽  
Elaeis Guineensis ◽  
Acid Sites ◽  
Co2 Atmosphere

Parabens (alkyl-p-hidroxybenzoates) are antimicrobial preservatives used in personal care products, classified as an endocrine disruptor, so they are considered emerging contaminants. A raw version of activated carbons obtained from African palm shell (Elaeis guineensis) modified chemically by impregnation with salts of CaCl2 (GC2), MgCl2 (GM2) and Cu(NO3)2 (GCu2) at 2% wt/v and carbonized in CO2 atmosphere at 1173 K was prepared. The process of adsorption of methyl (MePB) and ethylparaben (EtPB) from aqueous solution on the activated carbons at 18 °C was studied and related to the interactions between the adsorbate and the adsorbent, which can be quantified through the determination of immersion enthalpies in aqueous solutions of corresponding paraben, showing the lowest-value carbon GM2, which has a surface area of 608 m2 × g−1, while the highest values correspond to the activated carbon GCu2, with a surface area of 896 m2 × g−1 and the highest content of surface acid sites (0.42 mmol × g−1), such as lactonic and phenolic compounds, which indicates that the adsorbate–adsorbent interactions are favored by the presence of these, with interaction enthalpies that vary between 5.72 and 51.95 J × g−1 for MePB adsorption and 1.24 and 52.38 J × g−1 for EtPB adsorption showing that the process is endothermic.

STUDY PORE CHARACTERIZATION OF γ-ALUMINA – ACTIVATED CARBON COMPOSITE MADE OF CASSAVA PEELS (Manihot esculenta Cranz)

2015 ◽  
Vol 11 (1) ◽  
pp. 47
Author(s):  
Hartini Hartini ◽  
Yuniawan Hidayat ◽  
Mudjijono Mudjijono
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
Total Pore Volume ◽  
Carbon Composite ◽  
Bet Method ◽  
Industrial Standards ◽  
Cassava Peels ◽  
Made In

<p>A composite of γ-alumina and activated carbon made of cassava peels was studied in terms of its pore structures and its properties. The objective of this study was to determine the interaction and structure, as well as the character and pore size of γ-alumina – activated carbon composite.</p><p>Carbon made of cassava peels was activated by H<sub>2</sub>SO<sub>4</sub> and its activities were tested according to the Indonesian Industrial Standards (SII). The addition of activated carbon into γ-alumina made in variations of 10, 20, 30, 40 and 50 % w/w, of the total weight of 10 grams. The composite of γ-alumina - activated carbon was characterized by FTIR, SAA (Surface Area Analyzer), XRD, and determination of Hysteresis Loop composites.</p>The greater addition of activated carbon to γ-alumina causes intermolecular interactions between –O-H groups form rehydrated hydrogen bonds in the composite is greater. The structure of γ-alumina in the composites remain intact although the percentage of activated carbon in composite is large. The total pore volume and surface area using the BET method of the composite decreases with increasing activated carbon percentage. The greater addition of activated carbon to γ-alumina causes size of mesoporous composites decreased with the characteristic of a composite formed is closer to the activated carbon.

scholarly journals RAPID METHOD FOR DETERMINATION OF NANO SURFACE AREA OF ARECANUT SHELL DERIVED ACTIVATED CARBON BY IODINE ADSORPTION NUMBER

2018 ◽  
Vol 6 (432) ◽  
pp. 53-56
Author(s):  
A.S. Jadhava ◽  
◽  
G.T. Mohanraj ◽  
S. Mayadevi ◽  
A.N. Gokarn ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
Rapid Method ◽  
Iodine Adsorption

scholarly journals PRE-CONCENTRATION AND DETERMINATION OF HEAVY METALS ON MODIFIED ACTIVATED CARBON IN REAL SAMPLES

2010 ◽  
Vol 8 (2) ◽  
pp. 130-135
Author(s):  
F. Ahmadi ◽  
K. Niknam ◽  
A. Khanmohammadi ◽  
Z. Adibmehr
Keyword(s):  
Heavy Metals ◽  
Activated Carbon ◽  
Signal To Noise Ratio ◽  
Signal To Noise ◽  
Simple Method ◽  
Modified Activated Carbon ◽  
Real Samples ◽  
At Resonance ◽  
Simultaneous Separation

A sensitive and simple method for the simultaneous pre-concentration of nutritionally important minerals in real samples has been reported. The method is based on the formation of metal complexes by N, N'-diacetyl-4-bromo-2, 6-di (aminomethyl) phenol (DBDP) loaded on activated carbon. The metals content on the complexes are then eluted using 6mL 4M HNO3, which are detected by AAS at resonance line. In this procedure, minerals such as Ni, Cu, Co, Pb Zn and Cd can be analyzed in one run by caring out the simultaneous separation and quantification of them. At optimum condition the response are linear over concentration range of for 0.03-1.1 µg mL-1 for Ni2+ , 0.03-1.0 µg mL-1 for Cu2+, 0.02-1.0 µg mL-1 for  Pb2+ , 0.02-1.0 µg mL-1 for  Co2+,0.02-1.1 µg mL-1 Zn2+ and 0.05-1.3 µg mL-1for Cd2+. The detection limits of each element are expressed as the amount of analytes in µg mL-1 giving a signal to noise ratio of 3 are equal to 2.5, 2.4, 1.6, 2.4, 1.9 and 2.1 for Ni2+ , Cu2+, Pb2+ , Co2+,Zn2+ and Cd2+. The ability of method for repeatable recovery of trace ion are 99.9, 98.7, 99.2 , 98.7, 98.5and 95.6 with R.S.D of 1.3, 1.4, 1.2, 1.4, 1.7 and 1.4 for Ni2+ , Cu2+, Pb2+ , Co2+,Zn2+ and Cd2+. The method has been successfully applied for these metals content evaluation in some real samples including natural water and vegetable.     Keywords: Heavy Metals, N, N'-diacetyl-4-bromo-2,6-di(aminomethyl) phenol (DBDP), Activated Carbon

scholarly journals STUDY PORE CHARACTERIZATION OF γ-ALUMINA – ACTIVATED CARBON COMPOSITE MADE OF CASSAVA PEELS (Manihot esculenta Cranz)

2016 ◽  
Vol 11 (1) ◽  
pp. 47
Author(s):  
Hartini Hartini ◽  
Yuniawan Hidayat ◽  
Mudjijono Mudjijono
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
Total Pore Volume ◽  
Carbon Composite ◽  
Bet Method ◽  
Industrial Standards ◽  
Cassava Peels ◽  
Made In

<p>A composite of γ-alumina and activated carbon made of cassava peels was studied in terms of its pore structures and its properties. The objective of this study was to determine the interaction and structure, as well as the character and pore size of γ-alumina – activated carbon composite.</p><p>Carbon made of cassava peels was activated by H<sub>2</sub>SO<sub>4</sub> and its activities were tested according to the Indonesian Industrial Standards (SII). The addition of activated carbon into γ-alumina made in variations of 10, 20, 30, 40 and 50 % w/w, of the total weight of 10 grams. The composite of γ-alumina - activated carbon was characterized by FTIR, SAA (Surface Area Analyzer), XRD, and determination of Hysteresis Loop composites.</p>The greater addition of activated carbon to γ-alumina causes intermolecular interactions between –O-H groups form rehydrated hydrogen bonds in the composite is greater. The structure of γ-alumina in the composites remain intact although the percentage of activated carbon in composite is large. The total pore volume and surface area using the BET method of the composite decreases with increasing activated carbon percentage. The greater addition of activated carbon to γ-alumina causes size of mesoporous composites decreased with the characteristic of a composite formed is closer to the activated carbon.

scholarly journals Determination of Dislodgeable Residues of N-4-Chlorobenzoyl-N’-Benzoyl-N’-tert-Butylhydrazine (RH-0345) from Grass by Liquid Chromatography

1997 ◽  
Vol 80 (2) ◽  
pp. 418-425
Author(s):  
Stephen S Skorczynskis
Keyword(s):  
Liquid Chromatography ◽  
Standard Deviation ◽  
Surface Area ◽  
Methylene Chloride ◽  
Threshold Value ◽  
Total Surface Area ◽  
Deionized Water ◽  
Uv Detection ◽  
Simple Method

Abstract A simple method for determining chemically and physically dislodgeable residues of N-4-chloroben-zoyl-N′-benzoyl- N′-tert-butylhydrazine (RH-0345) from grass is described. To determine chemical dis- lodgeability, a sample of fresh grass leaves is washed with deionized water containing a small amount of the wetting agent Aerosol OT-75. Quantitation of residues removed from the grass is based on the total surface area of grass analyzed. Physical dislodgeability is measured by sampling an area of turf for 1 min. Sampling is accomplished by a person wearing a dosimeter made from a common athletic sock. Grass-stained socks are extracted with 75% acetonitrile in deionized water, and the extracts are diluted with water. Quantitation of physically dislodgeable residues is based on the total RH-0345 residue adsorbed on the sock and is expressed as ng RH-0345/cm2 of sock in contact with the grass. For amounts of dislodgeable residues greater than the threshold value of 250 ng/cm2 for grass and 100 ng/cm2 for socks, extracts are analyzed directly by liquid chromatography (LC) using a C8 column and UV detection at 260 nm. For samples with significantly lower amounts of dislodgeable residues, diluted extracts are partitioned with methylene chloride. The methylene chloride containing the RH-0345 residues is evaporated just to dryness, and the residues are reconstituted in 30% acetonitrile in water and then analyzed by LC. The validated sensitivity of the method is 0.5 ng/cm2 for grass and 50 ng/cm2 for cotton socks. Grass was fortified at 0.5–10 000 ng/cm2. Average RH-0345 recovery from grass was 94 ± 10% standard deviation (SD). Apparent RH-0345 residues in control grass were 0.0558 ng/cm2. Socks were fortified at 50–40 000 ng/cm2. Average RH-0345 recovery from socks was 98 ± 7% SD. Apparent RH-0345 residues in control socks were 6.13 ng/cm2.

scholarly journals Preparation of Composite Derived from Banana Peel Activated Carbon and MgFe2O4 as Magnetic Adsorbent for Methylene Blue Removal

2021 ◽  
Vol 23 (12) ◽  
pp. 440-448
Author(s):  
Arie Hardian ◽  
Rosi Rosidah ◽  
Senadi Budiman ◽  
Dani Gustaman Syarif
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Surface Area ◽  
Textile Industry ◽  
Contact Time ◽  
Magnetic Adsorbent ◽  
X Ray ◽  
Industry Waste ◽  
Adsorption Performance

Methylene blue (MB) is one of the dyes used often by the textile industry. Therefore, MB residual is contained in the textile industry waste. MB can irritate, leading to permanent eye and animal injuries; therefore, the textile industry waste concentration must be degraded before disposed to the environment. MB residual in textile industry waste can be treated with activated carbon adsorption. However, the adsorption method is less effective because the deposition takes a long time. This research aims to make activated carbon composites from banana peels and magnesium ferrite (BPAC/MgFe2O4) using the coprecipitation method to obtain activated carbon with magnetic properties (magnetic adsorbent). The obtained composite was characterized using X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Energy Dispersive X-Ray (EDX), and Surface Area Analyzer. The adsorption performance of methylene blue on composites was evaluated with variations in pH, concentration, contact time, determination of adsorption isotherms, and kinetics of adsorption. XRD analysis results showed the composite has a cubic crystal structure with a crystallite size of 7.69 nm. SEM analysis results show the surface morphology has pores with irregular shapes. EDX analysis results showed that the composition of activated carbon composite was 65.56% carbon, 2.28% Mg, 5.50% Fe, and 26.66% O. The results surface area analysis showed a composite surface area of 88.134 m2/g. Composite adsorption performance showed maximum results at pH 7, variations in concentration at 10 ppm, and contact time 180 minutes with adsorption capability of 99.26%. Determination of the adsorption isotherm follows the Freundlich adsorption isotherm model with a pseudo-second-order adsorption kinetics model. The obtained BPAC/MgFe2O4 composite can potentially be a magnetic adsorbent capable of adsorbing methylene blue in an aqueous solution.

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