Thermal analysis of physical and chemical changes occuring during regeneration of activated carbon

High-temperature thermal process is a commercial way of regeneration of spent granular activated carbon. The paper presents results of thermal analysis conducted in order to examine high-temperature regeneration of spent activated carbon, produced from coconut shells, previously used in drinking wat...

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Main Authors: Radić Dejan B., Stanojević Miroslav M., Obradović Marko O., Jovović Aleksandar M.
Format: Article
Language:English
Published: VINCA Institute of Nuclear Sciences 2017-01-01
Series:Thermal Science
Subjects:
Online Access:http://www.doiserbia.nb.rs/img/doi/0354-9836/2017/0354-98361600048R.pdf
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spelling doaj-a6c3137dc4774da18b0a91603db72fef2021-01-02T08:34:25ZengVINCA Institute of Nuclear SciencesThermal Science0354-98362334-71632017-01-012121067108110.2298/TSCI150720048R0354-98361600048RThermal analysis of physical and chemical changes occuring during regeneration of activated carbonRadić Dejan B.0Stanojević Miroslav M.1Obradović Marko O.2Jovović Aleksandar M.3Faculty of Mechanical Engineering, BelgradeFaculty of Mechanical Engineering, BelgradeFaculty of Mechanical Engineering, BelgradeFaculty of Mechanical Engineering, BelgradeHigh-temperature thermal process is a commercial way of regeneration of spent granular activated carbon. The paper presents results of thermal analysis conducted in order to examine high-temperature regeneration of spent activated carbon, produced from coconut shells, previously used in drinking water treatment. Results of performed thermogravimetric analysis, derivative thermogravimetric analysis, and differential thermal analysis, enabled a number of hypotheses to be made about different phases of activated carbon regeneration, values of characteristic parameters during particular process phases, as well as catalytic impact of inorganic materials on development of regeneration process. Samples of activated carbon were heated up to 1000°C in thermogravimetric analyser while maintaining adequate oxidizing or reducing conditions. Based on diagrams of thermal analysis for samples of spent activated carbon, temperature intervals of the first intense mass change phase (180-215°C), maximum of exothermic processes (400-450°C), beginning of the second intense mass change phase (635-700°C), and maximum endothermic processes (800-815°C) were deter-mined. Analysing and comparing the diagrams of thermal analysis for new, previously regenerated and spent activated carbon, hypothesis about physical and chemical transformations of organic and inorganic adsorbate in spent activated carbon are given. Transformation of an organic adsorbate in the pores of activated carbon, results in loss of mass and an exothermic reaction with oxygen in the vapour phase. The reactions of inorganic adsorbate also result the loss of mass of activated carbon during its heating and endothermic reactions of their degradation at high temperatures.http://www.doiserbia.nb.rs/img/doi/0354-9836/2017/0354-98361600048R.pdfthermal analysisactivated carbonthermogravimetric analysisregenerationdifferential thermal analysis
collection DOAJ
language English
format Article
sources DOAJ
author Radić Dejan B.
Stanojević Miroslav M.
Obradović Marko O.
Jovović Aleksandar M.
spellingShingle Radić Dejan B.
Stanojević Miroslav M.
Obradović Marko O.
Jovović Aleksandar M.
Thermal analysis of physical and chemical changes occuring during regeneration of activated carbon
Thermal Science
thermal analysis
activated carbon
thermogravimetric analysis
regeneration
differential thermal analysis
author_facet Radić Dejan B.
Stanojević Miroslav M.
Obradović Marko O.
Jovović Aleksandar M.
author_sort Radić Dejan B.
title Thermal analysis of physical and chemical changes occuring during regeneration of activated carbon
title_short Thermal analysis of physical and chemical changes occuring during regeneration of activated carbon
title_full Thermal analysis of physical and chemical changes occuring during regeneration of activated carbon
title_fullStr Thermal analysis of physical and chemical changes occuring during regeneration of activated carbon
title_full_unstemmed Thermal analysis of physical and chemical changes occuring during regeneration of activated carbon
title_sort thermal analysis of physical and chemical changes occuring during regeneration of activated carbon
publisher VINCA Institute of Nuclear Sciences
series Thermal Science
issn 0354-9836
2334-7163
publishDate 2017-01-01
description High-temperature thermal process is a commercial way of regeneration of spent granular activated carbon. The paper presents results of thermal analysis conducted in order to examine high-temperature regeneration of spent activated carbon, produced from coconut shells, previously used in drinking water treatment. Results of performed thermogravimetric analysis, derivative thermogravimetric analysis, and differential thermal analysis, enabled a number of hypotheses to be made about different phases of activated carbon regeneration, values of characteristic parameters during particular process phases, as well as catalytic impact of inorganic materials on development of regeneration process. Samples of activated carbon were heated up to 1000°C in thermogravimetric analyser while maintaining adequate oxidizing or reducing conditions. Based on diagrams of thermal analysis for samples of spent activated carbon, temperature intervals of the first intense mass change phase (180-215°C), maximum of exothermic processes (400-450°C), beginning of the second intense mass change phase (635-700°C), and maximum endothermic processes (800-815°C) were deter-mined. Analysing and comparing the diagrams of thermal analysis for new, previously regenerated and spent activated carbon, hypothesis about physical and chemical transformations of organic and inorganic adsorbate in spent activated carbon are given. Transformation of an organic adsorbate in the pores of activated carbon, results in loss of mass and an exothermic reaction with oxygen in the vapour phase. The reactions of inorganic adsorbate also result the loss of mass of activated carbon during its heating and endothermic reactions of their degradation at high temperatures.
topic thermal analysis
activated carbon
thermogravimetric analysis
regeneration
differential thermal analysis
url http://www.doiserbia.nb.rs/img/doi/0354-9836/2017/0354-98361600048R.pdf
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