scholarly journals Adsorption of Phenol from Aqueous Solutions on Activated Carbons with Different Oxygen Contents

1989 ◽  
Vol 6 (4) ◽  
pp. 182-191 ◽  
Author(s):  
S. Biniak ◽  
J. Kaźmièrczak ◽  
A. Swiatkowski
Keyword(s):  
Activated Carbon ◽  
Aqueous Solutions ◽  
Functional Groups ◽  
Activated Carbons ◽  
Principal Factor ◽  
Raw Material ◽  
Surface Functional Groups ◽  
Phenol Adsorption ◽  
Chemical Character

The effect of the chemical character of the surface of an activated carbon on phenol adsorption from aqueous solutions is described. The adsorbents used consisted of five types of activated carbon obtained by modification of the raw material. The results obtained indicate that the principal factor influencing adsorption is the oxygen contained in those surface functional groups which exhibit an acidic character. Moderately and slightly acidic groups are the most important in this context.

scholarly journals Adsorption of Polydisperse Polyvinyl Alcohol Molecules on the Surface of Activated Carbons

2003 ◽  
Vol 21 (5) ◽  
pp. 463-473
Author(s):  
J. Barkauskas ◽  
A. Vinslovaite
Keyword(s):  
Activated Carbon ◽  
Polyvinyl Alcohol ◽  
Functional Groups ◽  
Adsorption Process ◽  
Activated Carbons ◽  
Surface Heterogeneity ◽  
Raw Material ◽  
Carbon Substrate ◽  
Gel Chromatography ◽  
Graphene Layers

The adsorption of polyvinyl alcohol (PVA) on activated carbons was studied in aqueous solutions. Each batch of activated carbon produced was obtained via a definite number of technological operations using wood as the raw material. The adsorption process was studied using a gel chromatography technique with potentiometric titrations being employed for evaluating the chemical composition of the activated carbons produced. The data obtained from the various activated carbon samples were compared to ascertain the adsorption mechanism. It was concluded that water molecules had a limited influence on the competitive process of polymer adsorption. A rather pronounced negative correlation between the number of phenol functional groups and PVA adsorption capacity was observed, indicating that these groups hindered the adsorption process. Assumptions concerning the role of phenol functional groups were made, taking into account not only the surface heterogeneity but also changes in the electron density of the graphene layers in the carbon substrate.

scholarly journals Coffee residue-based activated carbons for phenol removal

2021 ◽  
Author(s):  
Hemavathy Palanisami ◽  
Mohamad Rafiuddin Mohd Azmi ◽  
Muhammad Abbas Ahmad Zaini ◽  
Zainul Akmar Zakaria ◽  
Muhd Nazrul Hisham Zainal Alam ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
Functional Groups ◽  
High Performance ◽  
Activated Carbons ◽  
Phenol Removal ◽  
Surface Functional Groups ◽  
Maximum Capacity ◽  
Second Stage ◽  
Adsorptive Properties

Abstract This work was aimed to evaluate the adsorptive properties of activated carbons from coffee residue for phenol removal. The coffee residue was activated using H3PO4 and KOH, and the resultant activated carbons were characterized for surface area and functional groups. The values of surface area were recorded as 1,030 m2/g and 399 m2/g for H3PO4- and KOH-activated carbons, respectively. The maximum capacity for phenol removal is comparable for both activated carbons at 43 mg/g. The pores might be inaccessible due to electrostatic repulsion by surface functional groups and hydroxyl anions. The second stage in a two-stage adsorber design is necessary to accomplish the process with high performance and minimum dosage of activated carbon. Coffee residue is a promising activated carbon precursor for phenol removal.

scholarly journals Preparation of Mesoporous Activated Carbon from Jackfruit PPI-1 Waste and Development of Different Surface Functional Groups

2015 ◽  
Vol 54 ◽  
pp. 189-200
Author(s):  
T.V. Nagalakshmi ◽  
K.A. Emmanuel ◽  
Ch. Suresh Babu ◽  
Ch. Chakrapani ◽  
P. Paul Divakar
Keyword(s):  
Activated Carbon ◽  
Functional Groups ◽  
Activated Carbons ◽  
Morphological Changes ◽  
Bet Surface Area ◽  
Surface Functional Groups ◽  
Phase Oxidation ◽  
Different Temperatures ◽  
Activating Agent ◽  
Thermal Stability Of

Jackfruit PPI-1 variety was selected as source of lignocellulose material. Its rind and pulp waste was used as precursor for preparation of activated carbon. K2CO3 was selected as activating agent to prepare activated carbon. Various carbons were prepared by changing the impregnation ratio (IR) at different temperatures. Activated carbon prepared at 600°C and at IR1 had good BET surface area (987m2 g-1) and yield (61.97%). In order to introduce different functional groups, this carbon was divided into two parts. One part was subjected to liquid phase oxidation with 0.1N HNO3 and the other part was soaked in 0.1N KOH for 3hours. SEM, FTIR, TPD, XRD and TGA analyses were done to identify surface morphological changes, nature of functional groups and thermal stability of activated carbons.

scholarly journals Effect of Carbon–Oxygen and Carbon–Nitrogen Surface Complexes on the Adsorption of Cations by Activated Carbons

1986 ◽  
Vol 3 (4) ◽  
pp. 293-302 ◽  
Author(s):  
J. Rivera–Utrilla ◽  
M. A. Ferro–García
Keyword(s):  
Activated Carbon ◽  
Aqueous Solutions ◽  
Functional Groups ◽  
Activated Carbons ◽  
Surface Acidity ◽  
Surface Complexes ◽  
Adsorption Studies ◽  
Neutralization Techniques

Adsorption studies of Na+, Cs+, Ag+, Sr2+ and Co2+ from aqueous solutions by surface-treated activated carbons are reported. Carbon–oxygen and carbon–nitrogen surface complexes were formed on an activated carbon from almond shells by treating it with either oxidizing reagents or ammonia. In order to discover the surface acidity and/or basicity of each carbon, selective neutralization techniques were carried out. Both Na+ and Cs+ are adsorbed by only those carbons containing strong acidic functional groups; however, Ag+, Sr2+ and Co2+ are adsorbed not only by these latter carbons but also by those with predominance of basic groups. The results suggest that some of these carbons can be used to remove, separate and pre-concentrate all the cations studied.

scholarly journals Effect of textural and chemical characteristics of activated carbons on phenol adsorption in aqueous solutions

2017 ◽  
Vol 19 (4) ◽  
pp. 87-93 ◽  
Author(s):  
Diana P. Vargas ◽  
Liliana Giraldo ◽  
Juan Carlos Moreno-Piraján
Keyword(s):  
Activated Carbon ◽  
Aqueous Solutions ◽  
Surface Area ◽  
Pore Volume ◽  
Activated Carbons ◽  
Chemical Activation ◽  
Chemical Properties ◽  
Granular Activated Carbon ◽  
Bet Surface Area ◽  
Phenol Adsorption

Abstract The effect of textural and chemical properties such as: surface area, pore volume and chemical groups content of the granular activated carbon and monoliths on phenol adsorption in aqueous solutions was studied. Granular activated carbon and monolith samples were produced by chemical activation. They were characterized by using N2 adsorption at 77 K, CO2 adsorption at 273 K, Boehm Titrations and immersion calorimetry in phenol solutions. Microporous materials with different pore size distribution, surface area between 516 and 1685 m2 g−1 and pore volumes between 0.24 and 0.58 cm3 g−1 were obtained. Phenol adsorption capacity of the activated carbon materials increased with increasing BET surface area and pore volume, and is favored by their surface functional groups that act as electron donors. Phenol adsorption capacities are in ranged between 73.5 and 389.4 mg · g−1.

scholarly journals Comparative Study on the Adsorption Capacity of Activated Carbon Prepared from Lapsi Seed Stone and Betel nut using Phosphoric Acid

2018 ◽  
Vol 13 (1) ◽  
pp. 153-159
Author(s):  
Sahira Joshi
Keyword(s):  
Activated Carbon ◽  
Comparative Study ◽  
Iodine Number ◽  
Adsorption Capacity ◽  
Functional Groups ◽  
Activated Carbons ◽  
Chemical Activation ◽  
Betel Nut ◽  
Surface Functional Groups ◽  
Methylene Blue Number

 This paper presents the comparative study on the adsorption capacity of activated carbons prepared from Lapsi (Choerospondias axillaris) seed stone and Betel (Areca catechu) nut. Activated carbons (ACs) were prepared from Lapsi seed stone (LSS) and Betel Nut (BN) by chemical activation with H3PO4 (in the ratio of 1:1 by weight) at 400°C. The pore structure of activated carbons was determined by iodine number and methylene blue number. Surface morphology of ACs was studied by scanning electron microscopy (SEM). Surface functional groups were analyzed by Fourier Transform Infra Red Spectroscopy (FTIR). As indicated by TGA analysis, the appropriate temperature required for carbonization was 400 ºC. Betel nut AC showed high iodine number and methylene number of 888 mg/gm and 369 mg/gm respectively. SEM micrographs of Betel nut AC show the presence of well developed pores on its surface. FTIR result indicated that both ACs contain −OH, >C=O groups as oxygen containing surface functional groups. Based on the result, the AC prepared from betel nut by activation with H3PO4 is comparable with commercial activated carbon and could be used as potential adsorbent for removal of pollutants from water and waste water.Journal of the Institute of Engineering, 2017, 13(1): 153-159

scholarly journals Oxytetracycline Adsorption from Aqueous Solutions on Commercial and High-Temperature Modified Activated Carbons

Energies ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3481
Author(s):  
Joanna Lach ◽  
Agnieszka Ociepa-Kubicka ◽  
Maciej Mrowiec
Keyword(s):  
Activated Carbon ◽  
Aqueous Solutions ◽  
Activated Carbons ◽  
Electricity Consumption ◽  
Solution Ph ◽  
Carbon Modification ◽  
Modification Method ◽  
Flow Through ◽  
Proposed Modification ◽  
Modified Activated Carbons

The aim of the work was to evaluate the possibility of using commercial and modified activated carbons for the removal of oxytetracycline from aqueous solutions. The kinetics and statics of adsorption as well as the effect of the activated carbon dose and solution pH on the efficiency of the oxytetracycline adsorption were analyzed. Based on the study of oxytetracycline adsorption isotherms, the activated carbons were ranked in the following order: F-300 > WG-12 > Picabiol > ROW08 > WACC 8 × 30 > F-100 > WAZ 0.6–2.4. The most effective activated carbons were characterized by large specific surfaces. The best matching results were obtained for: Redlich–Peterson, Thot and Jovanovic models, and lower for the most frequently used Freundlich and Langmuir models. The adsorption proceeded better from solutions with pH = 6 than with pH = 3 and 10. Two ways of modifying activated carbon were also assessed. A proprietary method of activated carbon modification was proposed. It uses the heating of activated carbon as a result of current flow through its bed. Both carbons modified at 400 °C in the rotary kiln and on the proprietary SEOW (Joule-heat) modification stand enabled to obtain adsorbents with higher and comparable monolayer capacities. The advantage of the proposed modification method is low electricity consumption.

Modification of Activated Carbon and its Application on Adsorption of UDMH Gas

2013 ◽  
Vol 634-638 ◽  
pp. 1026-1030 ◽  
Author(s):  
Huan Chun Wang ◽  
Xiao Li Gou ◽  
Xiao Meng Lv
Keyword(s):  
Activated Carbon ◽  
High Temperature ◽  
Transition Metal ◽  
Surface Structure ◽  
Functional Groups ◽  
Room Temperature ◽  
Activated Carbons ◽  
Metal Solution ◽  
Modified Activated Carbons

Two kinds of modified activated carbons were prepared by dipping with Zn(NO3)2 solution and by reducing in the atmosphere of N2 at high temperature respectively, which were characterized by FTIR,DSC,SEM and EDS. The surface structure was strongly changed in the process, along with the changes of chemical functional groups. The results of adsorption experiments revealed that the adsorbent capacities of UDMH gas at room temperature were enhanced obviously by modification compared with the raw activated carbon, especially dipped by transition metal solution. The mechanism probably involved was also discussed.

Oxidation of activated carbon by hydrogen peroxide. Study of surface functional groups by FT-i.r.

Fuel ◽  
1994 ◽  
Vol 73 (3) ◽  
pp. 387-395 ◽  
Author(s):  
V GOMEZSERRANO ◽  
M ACEDORAMOS ◽  
A LOPEZPEINADO ◽  
C VALENZUELACALAHORRO
Keyword(s):  
Hydrogen Peroxide ◽  
Activated Carbon ◽  
Functional Groups ◽  
Surface Functional Groups
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