1 ADSORPTION Adsorption is a process that occurs when a gas or liquid solute accumulates on the surface of a solid or a liquid (adsorbent)‚ forming a molecular or atomic film (the adsorbate). It is different from absorption‚ in which a substance diffuses into a liquid or solid to form a solution. The term sorption encompasses both processes‚ while desorption is the reverse process. Adsorption is operative in most natural physical‚ biological‚ and chemical systems‚ and is widely used in industrial
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Adsorption Experiment This paper will be discussion the adsorption experiment conducted in Dr.O lab class. This paper will cover what Chitin/Chitson are but before explaining what these are it is best to get an understanding of what adsorption‚ absorption and sorption are. Adsorption is the accumulation of gases‚ liquids‚ or solutes on the surface of a solid or liquid. This binding is very weak. Almost anything such as fluids that dissolves can break the binding of the molecules. In addition adsorption
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Adsorption by Powders and Porous Solids Principles‚ Methodology and Applications Frangoise Rwqu~ra& Rouquerol and ’lean Hennet%Sing Centre de Therrnodynamique et de Microcalorimktrie du CNRS and Universite ’ de Provence‚ 26 rue du l4lLme RIA 13003 Marseille France ACADEMIC PRESS San Diego London Boston New York Sydney Tokyo Toronto This book is printed on acid-free paper. Copyright Q 1999 by Academic Press All rights reserved. No part of this publication may be reproduced or transmitted
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1. Adsorption: Concentration of liquid or gaseous molecules over the surface of a solid material is known as adsorption. It is a surface phenomenon. (e.g.) H2 adsorption over nickel. The solid material is known as adsorbent. (e.g.) Nickel‚ Silica gel‚ Charcoal‚ Zeolite The gaseous or liquid molecules are adsorbate (e.g.) H2 gas‚ Bromine‚ benzene‚ water vapour For gases‚ a special name is given as “occlusion’ 2.If the concentration is of bulk phenomenon‚ it is absorption
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diffusion and rate of adsorption‚ thus comparing transport mechanism and chemical sorption processes. The sorption rates based on the pseudo-second order rate constants for the five metal ions are 0.018 (Al3+)‚ 0.016 (Cr6+)‚ 0.023 (Zn2+)‚ 0.021 (Ag+) and 0.022 (Mn2+) g/mg.min. The adsorption rates are rapid and within 180 min of agitation more than 85 percent of these metal ions has been removed from solution by the ATL waste biomass. The kinetic data suggest that the overall adsorption process is endothermic
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novel adsorption processes in water purification: A review QU Jiuhui ∗ State Key Laboratory of Environmental Aquatic Chemistry‚ Research Center for Eco-Environmental Sciences‚ Chinese Academy of Sciences‚ Beijing 100085‚ China. E-mail: jhqu@rcees.ac.cn Abstract As an effective‚ efficient‚ and economic approach for water purification‚ adsorbents and adsorption processes have been widely studied and applied in different aspects for a long time. In the recent years‚ a lot of novel adsorption processes
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Chemistry. POINTS TO BE REMEMBERED: --1. Adsorption: - The accumulation of molecules species at the surface rather in the bulk of a solid or liquid is termed adsorption. 2. Desorption:-Removal of adsorbate from the surface of adsorbent is known as Desorption. 3. Sorption:-When adsorption and absorption both takes place simultaneously. 4. Type of adsorption: - On the basis of interaction between adsorption and absorption‚ adsorbate are of two types: (i)Physical adsorption/physisorption: - When weak vander
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solutions. The biosorption studies were conducted in batch adsorption system as a function of contact time and initial metal ion concentration. The adsorption system attained equilibrium after 150 min of contact time for Pb (II)‚ Cu (II)‚ Zn (II) and Cd (II). The removal efficiency of red alga improved as metal ions concentrations were lowered. The equilibrium sorption data was better explained by Langmuir isotherm model suggesting that the adsorption of metal cations observed monolayer sorption pattern
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Research Journal Of Chemistry And Environment‚ Vol. 7 (4) Dec. (2003) Res. J. Chem. Environ. Review Paper: Biosorption of Heavy Metals N. Ahalya‚ T.V. Ramachandra*l and RD. Kanamadi2 1. Centre for Ecological Sciences‚ Indian Institute of Science‚ Bangalore 560 012‚ INDIA. 2. Department of Zoology‚ Karnataka University‚ Dharwad‚ INDIA. Abstract: The discharge of heavy metals into aquatic ecosystems has become a matter of concern in India over the last few decades. These
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pose serious environmental threats.Fish scales of teleosts: Chanos chanos and Tilapia nilotica were utilized for recovering astaxanthin. The innovation in adsorption is the utilization of solid wastes as natural sorption material and their availability at minimal cost. Synthetic astaxanthin dissolved in water was made to flow in "Fish Scale Adsorption Apparatus" (FSAA) containing unshredded or shredded scales. Comparison of treatments based on the discoloration of filtrate to be released from the FSAA
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