Effect of Carbon Pretreatment on Cerium Loaded Activated Carbon as Desulfurization Adsorbents

2012 ◽  
Vol 557-559 ◽  
pp. 1584-1587
Author(s):  
Lin Xiong ◽  
Xue Min Yan ◽  
Yuan Zhu Mi
Keyword(s):  
Activated Carbon ◽  
Surface Chemistry ◽  
Adsorption Capacity ◽  
Adsorption Isotherms ◽  
Metal Species ◽  
Model Fuel ◽  
Texture Property ◽  
The One

Activated carbon (AC) was pretreated by H2O2 or HNO3 and then loaded with cerium to obtain Ce/AC composites as desulfurization adsorbents. The adsorption isotherms of as-prepared Ce/AC composites for dibenzothiophene were measured in static batch desulfurization of model fuel and compared with the one prepared without AC pretreatment. It was found that both H2O2 and HNO3 pretreatment could enhance the adsorption capacity of Ce/AC composites. The results were discussed in terms of surface chemistry and texture property. The improvement could be related to increased surface acidic groups and better dispersion of loaded metal species bought about by the two pretreatment methods

SURFACE MODIFICATIONS OF ACTIVATED CARBON AND ITS IMPACT ON APPLICATION

2019 ◽  
Vol 26 (01) ◽  
pp. 1830006 ◽  
Author(s):  
MATHEUS PEGO ◽  
JANAÍNA CARVALHO ◽  
DAVID GUEDES
Keyword(s):  
Surface Modification ◽  
Activated Carbon ◽  
Surface Chemistry ◽  
Surface Structure ◽  
Adsorption Capacity ◽  
Activated Carbons ◽  
Surface Modifications ◽  
Hazardous Substances ◽  
Carbon Surface ◽  
Corona Treatment

The main and new surface modification methods of activated carbon (AC) and their influence on application (adsorption capacity) were reviewed. Adsorption capacity is an important issue, contributing to hazardous substances environment management. According to literature, it is true that surface chemistry strongly affects adsorption capacity. Surface chemistry can be modified by several methods that lead to different activated carbon properties. Furthermore, adsorbate properties, and their relationships with surface structure, can impact adsorption properties. Surface modifications can be conducted by adding some atoms to the surface structure, making the surface more acidic or basic. Introduction of oxygen and ammonia atoms (chemical modification) are the main processes to make the surface more acidic and basic, respectively, although may bring chemical wastes to environment. Surface modification is done by chemical and physical modifications that lead activated carbons to present different properties. The main and new methods of chemical and physical modifications are compared and presented in this paper. Some new physical methods, like corona treatment, plasma discharge and microwave radiation, can be applied to cause surface modifications. Corona treatment can be a practical and new way to cause surface modification on an activated carbon surface.

scholarly journals Comparative Adsorption of Phenol, P-Nitrophenol and P-Hydroxybenzoic Acid on Activated Carbon

1988 ◽  
Vol 5 (3) ◽  
pp. 213-228 ◽  
Author(s):  
Enrique Costa ◽  
Guillermo Calleja ◽  
Luis Marijuán
Keyword(s):  
Activated Carbon ◽  
Physicochemical Properties ◽  
Adsorption Capacity ◽  
Adsorption Isotherms ◽  
Curve Fitting ◽  
Hydroxybenzoic Acid ◽  
Heats Of Adsorption ◽  
Micro Organisms

Adsorption isotherms of phenol, p-nitrophenol and p-hydroxybenzoic acid at three temperatures in the range 1–40° C on activated carbon have been obtained experimentally. Curve fitting to several theoretical equations shows that the Prausnitz equation gives the lowest deviations (1–3%). An inversion of the adsorption capacity of phenol with temperature has been observed, probably as a consequence of the high microporosity of the carbon and the restricted accessibility of phenol to the smaller pores. Adsorption at 40°C is also accompanied by the degradation of phenol by aerobic micro-organisms (ficomicetus-type fungi). Approximate values of the isosteric heats of adsorption of p-nitrophenol have been calculated, being in the range 5.8–6.5 kcal/mol. Differences in the behaviour of the three adsorbates are commented upon in terms of their physicochemical properties.

Adsorption of Creatinine on Pine Nut Shell-Based High Surface Area Activated Carbon

2014 ◽  
Vol 1073-1076 ◽  
pp. 81-85
Author(s):  
Chun Yu Xi ◽  
Xue Bin Chu ◽  
Mu Yao Xi ◽  
Li Kun Zhao ◽  
Yun Ze Sun ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Aqueous Medium ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Adsorption Isotherms ◽  
High Surface ◽  
High Surface Area ◽  
Agricultural Biomass ◽  
Pine Nut ◽  
Biomass Materials

The objective of this research is to prepare high surface area activated carbon (AC) from agricultural biomass materials–pine nut shells–by the method of carbonization and alkaline activation. Adsorption isotherms of creatinine (CR) by pine nut shell-based high surface area activated carbon (AC) from aqueous medium have been studied. The results have been found that samples have larger capacity for removing CR from solution. The adsorption capacity of CR as intensity at first 50 min. After 50 min, it’s smooth and steady. The carbons prepared with KOH could be effectively used for the removal of CR.

Activated Carbon from Corn Cob and Petai Hull as Novel Adsorbent for Lead Removal

2018 ◽  
Vol 934 ◽  
pp. 165-169 ◽  
Author(s):  
Ajeng Y.D. Lestari ◽  
Kuni Masruroh ◽  
Intan Widyastuti
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Adsorption Capacity ◽  
Adsorption Isotherms ◽  
Adsorption Process ◽  
Carbonization Temperature ◽  
Model Fit ◽  
Lead Removal ◽  
Corn Cob ◽  
Ion Removal

Activated carbon was successfully generated from the mixture of corn cob and petai hull which served as adsorbents for Pb (II) ion removal at an aqueous solution. The activation was done using KOH at 800°C carbonization temperature. Synthetic waste used in the various concentration of 100, 200, 300, 400 and 500 ppm. The adsorption process was carried out at 30 minutes, the ratio of adsorbent mass was grouped as B (1:3 corn cobnative activated carbon/petai hullnative activated carbon), C (1:1 corn cobnative activated carbon/petai hullnative activated carbon), D (3:1, corn cobnative activated carbon/petai hullnative activated carbon), and H (1:1, corn cobmodifiedactivated carbon/petai hullmodifiedactivated carbon). The results showed that the highest adsorption capacity was found in H adsorbent that was 2,368 mg/g at concentration 300 ppm. Dubinin model fit the adsorption isotherms of B, C, D, and H.

In-Vitro Adsorption Studies of Isoniazid

1991 ◽  
Vol 10 (2) ◽  
pp. 133-135 ◽  
Author(s):  
O.E. Orisakwe ◽  
A. Akintonwa
Keyword(s):  
Activated Carbon ◽  
Carbon Black ◽  
Adsorption Capacity ◽  
Adsorption Isotherms ◽  
Activated Charcoal ◽  
Binding Capacity ◽  
In Vitro Experiments ◽  
Adsorption Studies ◽  
The Mean

In-vitro experiments were performed to investigate the extent of adsorption of isoniazid to activated charcoal and locally produced activated carbon black (N220) and to explore the effect of varying pH on this adsorption. The results of the study indicated that activated charcoal and activated carbon black adsorbed isoniazid effectively. Adsorption was dependent upon the quantity of charcoal used. With charcoal quantity at 0.5 g, adsorption was virtually completed within 60 min. The mean or composite adsorption capacity of activated charcoal and activated carbon black (?g ml-1 of charcoal) were 325 and 278, respectively. The result of adsorption isotherms indicated no change in binding capacity of the drug from solutions of different pH.

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).

scholarly journals Carbaryl Sorption by Porogen-Treated Banana Pith Carbon

2008 ◽  
Vol 26 (9) ◽  
pp. 679-686 ◽  
Author(s):  
M. Sathishkumar ◽  
J.G. Choi ◽  
C.S. Ku ◽  
K. Vijayaraghavan ◽  
A.R. Binupriya ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Adsorption Isotherms ◽  
Kinetic Data ◽  
Maximum Adsorption Capacity ◽  
Adsorption Ability ◽  
Ph Dependent ◽  
Langmuir And Freundlich Models

This paper reports the adsorption ability of banana pith activated carbon, with ZnCl2 as the porogen, towards carbaryl (1-naphthyl- N-methylcarbamate) from aqueous solution. The pH-edge experiments revealed that carbaryl adsorption onto ZnCl2-treated banana pith activated carbon (ZTC) was a pH-dependent process with maximum adsorption occurring at pH 11. The adsorption isotherm obtained at pH 11 revealed that ZTC possessed a maximum adsorption capacity of 45.9 mg/g. The adsorption isotherms were well described by the Langmuir and Freundlich models. The kinetic data obtained at different initial carbaryl concentrations were modelled using pseudo-first- and -second-order models. Acetone successfully desorbed carbaryl with a 99.8% elution efficiency.

Removal of Cr(VI) from aqueous solutions by using activated carbon supported iron catalysts as efficient adsorbents

2018 ◽  
Vol 15 (1) ◽  
pp. 3-13 ◽  
Author(s):  
Karima Derdour ◽  
Chafia Bouchelta ◽  
Amina Khorief Naser-Eddine ◽  
Mohamed Salah Medjram ◽  
Pierre Magri
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Adsorption Isotherms ◽  
Walnut Shell ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Solution Ph ◽  
Content Type ◽  
Order Kinetic Model ◽  
Fe Catalysts

Purpose The purpose of this paper is to focus on the removal of hexavalent chromium [Cr(VI)] from wastewater by using activated carbon-supported Fe catalysts derived from walnut shell prepared using a wetness impregnation process. The different conditions of preparation such as impregnation rate and calcination conditions (temperature and time) were optimized to determine their effects on the catalyst’s characteristics. Design/methodology/approach The catalyst samples were characterized using thermogravimetric analysis, scanning electron microscopy and Fourier transform infrared spectroscopy. The adsorption of Cr(VI) by using using activated carbon supported Fe catalysts derived from walnut shell as an adsorbent and catalyst was investigated under different adsorption conditions. The parameters studied were contact time, adsorbent dose, solution pH and initial concentrations. Findings Results showed that higher adsorption capacity and rapid kinetics were obtained when the activated walnut shell was impregnated with Fe at 5 per cent and calcined under N2 flow at 400°C for 2 h. The adsorption isotherms data were analyzed with Langmuir and Freundlich models. The better fit is obtained with the Langmuir model with a maximum adsorption capacity of 29.67 mg/g for Cr(VI) on Fe5-AWS at pH 2.0. Originality/value A comparison of two kinetic models shows that the adsorption isotherms system is better described by the pseudo-first-order kinetic model.

Analisis Variasi Temperatur Aktivasi Terhadap Daya Serap Arang Aktif Tandan Aren (Arenga Pinnata Merr) Dengan Agen Aktivasi Potassium Silicate(K2SiO3)

2020 ◽  
Vol 5 (3) ◽  
pp. 221
Author(s):  
Muhammad Azam ◽  
Muhammad Anas ◽  
Erniwati Erniwati
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Adsorption Capacity ◽  
Temperature Variation ◽  
Chemical Activation ◽  
Weight Ratio ◽  
Potassium Silicate ◽  
Physical Activation ◽  
Activation Temperature ◽  
Pyrolysis Reactor

This study aims to determine the effect of variation of activation temperature of activated carbon from sugar palm bunches of chemically activatied with the activation agent of potassium silicate (K2SiO3) on the adsorption capacity of iodine and methylene blue. Activated carbon from bunches of sugar palmacquired in four steps: preparationsteps, carbonizationstepsusing the pyrolysis reactor with temperature of 300 oC - 400 oC for 8 hours and chemical activation using of potassium silicate (K2SiO3) activator in weight ratio of 2: 1 and physical activation using the electric furnace for 30 minutes with temperature variation of600 oC, 650 oC, 700 oC, 750 oC and 800 oC. The iodine and methyleneblue adsorption testedby Titrimetric method and Spectrophotometry methodrespectively. The results of the adsorption of iodine and methylene blue activated carbon from sugar palm bunches increased from 240.55 mg/g and 63.14 mg/g at a temperature of 600 oC to achieve the highest adsorption capacity of 325.80 mg/g and 73.59 mg/g at temperature of 700 oC and decreased by 257.54 mg/g and 52.03 mg/g at a temperature of 800 oCrespectively.However, it does not meet to Indonesia standard (Standard Nasional Indonesia/SNI), which is 750 mg/g and 120 mg/g respectively.

scholarly journals Controlling surface chemistry and mechanical properties of metal ionogels through Lewis acidity and basicity

2021 ◽  
Vol 9 (8) ◽  
pp. 4679-4686
Author(s):  
Coby J. Clarke ◽  
Richard P. Matthews ◽  
Alex P. S. Brogan ◽  
Jason P. Hallett
Keyword(s):  
Mechanical Properties ◽  
Ionic Liquids ◽  
Ethylene Glycol ◽  
Surface Chemistry ◽  
Lewis Acidity ◽  
Metal Species ◽  
Poly Ethylene Glycol ◽  
Acidity And Basicity ◽  
Poly Ethylene

Gels prepared from metal containing ionic liquids with cross-linked poly(ethylene glycol) have surface compositions and mechanical properties that can be controlled by Lewis basicity and acidity of the metal species.

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