Effect of the extent of oxidation of activated carbons by O2 and HNO3 on the acidity and composition of surface functional groups and their ion-exchange 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.

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Aromatic compound adsorption from aqueous solution on activated carbons^|^#8212;Effects of adsorbate polarity and surface functional groups^|^#8212;

TANSO ◽

10.7209/tanso.2013.116 ◽

2013 ◽

Vol 2013 (257) ◽

pp. 116-123

Author(s):

Hiroaki Yoshida ◽

Yoshimasa Amano ◽

Tom Bizley ◽

Babak Fotoohi ◽

Louis Mercier ◽

...

Keyword(s):

Aqueous Solution ◽

Functional Groups ◽

Aromatic Compound ◽

Activated Carbons ◽

Surface Functional Groups

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Adsorption and Ion-Exchange Properties of Engineered Activated Carbons and Carbonaceous Materials

Ion Exchange and Solvent Extraction Series - Ion Exchange and Solvent Extraction ◽

10.1201/9780203913604.ch1 ◽

2004 ◽

Cited By ~ 1

Author(s):

Danish Malik ◽

Michael Streat ◽

Basudeb Saha

Keyword(s):

Ion Exchange ◽

Activated Carbons ◽

Carbonaceous Materials ◽

Exchange Properties

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Surface functional groups and redox property of modified activated carbons

Mining Science and Technology (China) ◽

10.1016/j.mstc.2011.02.020 ◽

2011 ◽

Vol 21 (2) ◽

pp. 181-184 ◽

Cited By ~ 6

Author(s):

Zhang Xianglan ◽

Deng Shengfu ◽

Liu Qiong ◽

Zhang Yan ◽

Cheng Lei

Keyword(s):

Functional Groups ◽

Activated Carbons ◽

Redox Property ◽

Surface Functional Groups ◽

Modified Activated Carbons

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

International Letters of Chemistry Physics and Astronomy ◽

10.18052/www.scipress.com/ilcpa.54.189 ◽

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.

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