Abstract
The use of plant extracts, recently, has been extended to the field of photocatalysis and is reported as a “greener” route. It is called “greener” because it uses plant extracts as the main component which doesn’t produce any toxic compound. The present work deals with the synthesis of bismuth oxyhalides (Cl, Br, I) with three different plant extracts, namely, Camellia sinensis, Azadirachta indica and Aloe barbadensis miller by a precipitation method for the removal of phenol under visible light. To clarify the effect of each plant extract, BiOX reference samples were prepared without plant extract. The samples were characterized for their structural, morphological, chemical and optical properties using XRD, SEM, FT-IR and DRS. Plant extracts, mainly, acted as structural and shape-tailoring agent as evident through a sharp decrease in the crystallite size and transformation of the plates-like morphology of BiOX. The photocatalysts BiOI with Azadirachta indica and BiOBr with Camellia sinensis extract removed 87 % and 82 % of phenol, respectively, within 240 min. The role of organics coming from the plant extracts is discussed and significant correlations with the structural and optical properties were made to unfold the mystery of activity enhancement of the plant extract mediated BiOXs.
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