Advanced Oxidation Processes (AOPs) by Bismuth Oxyhalides for Environmental Remediation Using Solar Energy: Enhancing Material Property through Synthesis
Journal Title: Archives of Organic and Inorganic Chemical Sciences - Year 2018, Vol 2, Issue 2
Abstract
To combat air and water pollution with green chemistry is one of the major issues. Several research groups, worldwide, are today engaged in the design and development of new photocatalytic materials which can act to make air and water free from harmful species with the use of freely available solar energy. These strategies have been briefly addressed here. We have also reported the synthesis of Bismuth oxyhalides BiOX(X=Cl, Br, I) by wt chemical method using Bismuth nitrate (Bi (NO3)3.5H2O) and respective potassium halides (KCl, KBr, KI) as precursor materials and mixture of deionized water and ethanol as solvent. Solvent composition is found to affect the photo activity of the three materials viz; BiOCl, BiOI and BiOBr differently. Synthesized samples were characterized by X-Ray diffraction (XRD), UV Visible absorption and HRSEM techniques. Photo degradation ability of the synthesized samples was ascertained by studying the degradation of methyl Orange (MO) in aqueous solution under UV light and solar light exposure environments. It is observed that the material crystallizes in the form of thin plates. BiOCl and BiOBrare found to exhibit excellent photo- degradation ability in the normal sun light exposure. Role of solvent composition on different oxyhalides have been attributed to the synthesis environment provided by solvent, which affect the crystal facet exposure. Use of chemicals for various purposes and rapid industrialization for advancement of society release a variety of chemicals into the atmosphere due to which the vital resources of life on our planet earth get polluted. Persistent environmental pollutants and water pollution have attracted world-wide attention. Solar light can greatly contribute to the remediation of these environmental pollutants - from the partial decomposition to the complete destruction. This solar remediation action works either through direct photolysis where photo degradation is achieved through chemical bond cleavage by light, leading to the formation of smaller compounds or by the use of photo catalyst where photon triggers the processes of photocatalytic degradation through advanced oxidation processes. Advanced Oxidation Processes (AOP) use the highly oxidant and non selective hydroxyl radicals, which are able to react with almost all classes of organic compounds leading to their complete mineralization or to the formation of more biodegradable intermediates. Hydroxyl radicals are able to attack and destroy even the most persistent organic molecules that are not oxidized by the oxidants as oxygen, ozone or chlorine [1]. This method can be applied to a large set of different matrices, decontamination occurs through pollutants degradation instead of their simple phase transfer. AOP become even more attractive when they use the sunlight as source of energy. Such photocatalytic processes can proceed either through heterogeneous photo catalysis or homogeneous photo catalysis.
Authors and Affiliations
ID Sharma, Chander Kant, AK Sharma, KK Sain
Keywords
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- EP ID EP602959
- DOI 10.32474/AOICS.2018.02.000131
- Views 121
- Downloads 0
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