A Comparative Study on Removal of Hazardous Anions from Water by Adsorption: A Review

This paper presents a comparative review of arsenite (As(III)), arsenate (As(V)), and fluoride (F−) for a better understanding of the conditions and factors during their adsorption with focus on (i) the isotherm adsorption models, (ii) effects of pH, (iii) effects of ionic strength, and (iv) effects...

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Bibliographic Details
Published inInternational Journal of Chemical Engineering Vol. 2018; no. 2018; pp. 1 - 21
Main Authors John, Yasinta, Mmereki, Daniel, David, Victor Emery
Format Journal Article
LanguageEnglish
Published Cairo, Egypt Hindawi Publishing Corporation 01.01.2018
Hindawi
Hindawi Limited
Subjects
Adsorbents
Adsorption
Aluminum
Anions
Arsenates
Arsenic removal
Bones
Carbonates
Chemical properties
Chemistry
Construction
Developing countries
Drinking water
Fluorides
Hazardous materials
LDCs
Pretreatment
Researchers
Science
Silicon dioxide
Studies
Surface chemistry
Zeolites
China
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Summary:This paper presents a comparative review of arsenite (As(III)), arsenate (As(V)), and fluoride (F−) for a better understanding of the conditions and factors during their adsorption with focus on (i) the isotherm adsorption models, (ii) effects of pH, (iii) effects of ionic strength, and (iv) effects of coexisting substances such as anions, cations, and natural organics matter. It provides an in-depth analysis of various methods of arsenite (As(III)), arsenate (As(V)), and fluoride (F-) removal by adsorption and the anions’ characteristics during the adsorption process. The surface area of the adsorbents does not contribute to the adsorption capacity of these anions but rather a combination of other physical and chemical properties. The adsorption capacity for the anions depends on the combination of all the factors: pH, ionic strength, coexisting substances, pore volume and particles size, surface modification, pretreatment of the adsorbents, and so forth. Extreme higher adsorption capacity can be obtained by the modification of the adsorbents. In general, pH has a greater influence on adsorption capacity at large, since it affects the ionic strength, coexisting anions such as bicarbonate, sulfate, and silica, the surface charges of the adsorbents, and the ionic species which can be present in the solution.
ISSN:1687-806X
1687-8078
DOI:10.1155/2018/3975948