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Author Petit, Camille.

Title Factors affecting the removal of ammonia from air on carbonaceous materials : investigation of reactive adsorption mechanism / Camille Petit
Published New York : Springer, [2012]
Online access available from:
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Description 1 online resource (xi, 118 pages) : illustrations
Series Springer theses, 2190-5053
Springer theses.
Contents Introduction -- Objectives and Research Approach -- Materials and Methods -- Performance of the Materials Tested for Ammonia Removal -- Role of Textural Parameters -- Role of Surface Chemistry -- Role of Water -- Mechanisms of Adsorption and Strength of Retention -- Conclusions -- Paths Toward Future Research
Summary Annotation Air pollution related to the release of industrial toxic gases, represents one of the main concerns of our modern world owing to its detrimental effect on the environment. To tackle this growing issue, efficient ways to reduce/control the release of pollutants are required. Adsorption of gases on porous materials appears as a potential solution. However, the physisorption of small molecules of gases such as ammonia is limited at ambient conditions. For their removal, adsorbents providing strong adsorption forces must be used/developed. In this study, new carbon-based materials are prepared and tested for ammonia adsorption at ambient conditions. Characterization of the adsorbents texture and surface chemistry is performed before and after exposure to ammonia to identify the features responsible for high adsorption capacity and for controlling the mechanisms of retention. The characterization techniques include: nitrogen adsorption, thermal analysis, potentiometric titration, FT-IR spectroscopy, X-ray diffraction, Energy Dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy and Electron Microscopy. The results obtained indicate that ammonia removal is governed by the adsorbents surface chemistry. On the contrary, porosity (and thus physisorption) plays a secondary role in this process, unless strong dispersive forces are provided by the adsorbent. The surface chemistry features responsible for the enhanced ammonia adsorption include the presence of oxygen-(carboxyl, hydroxyl, epoxy) and sulfur- (sulfonic) containing groups. Metallic species improve the breakthrough capacity as well as they lead to the formation of Lewis acid-base interactions, hydrogen-bonding or complexation. In addition to the latter three mechanisms, ammonia is retained on the adsorbent surface via Br√łnsted acid-base interactions or via specific reactions with the adsorbents functionalities leading to the incorporation of ammonia into the adsorbents matrix. Another mechanism involves dissolution of ammonia in water when moisture is present in the system. Even though this process increases the breakthrough capacity of a material, it provides rather weak retention forces since ammonia dissolved in water is easily desorbed from the adsorbents surface
Analysis Chemistry
Analytical biochemistry
Environmental chemistry
Environmental protection
Surfaces (Physics)
Atmospheric Protection/Air Quality Control/Air Pollution
Characterization and Evaluation of Materials
Analytical Chemistry
Notes Ph. D. City University of New York
Bibliography Includes bibliographical references and index
Subject Ammonia -- Absorption and adsorption.
Air -- Pollution -- Experiments.
Genre/Form Academic theses.
Form Electronic book
ISBN 1461433932 (electronic bk.)
9781461433934 (electronic bk.)