Title of article :
Highly Porous Bi(III) Modified Rice Husk Silica Photocatalyst for the Photocatalytic Removal of Cationic Methylene Blue
Author/Authors :
Jasni ، Normawati School of Chemical Sciences - Universiti Sains Malaysia , Iqbal ، Anwar School of Chemical Sciences - Universiti Sains Malaysia , Abu Bakar ، N. H. H School of Chemical Sciences - Universiti Sains Malaysia , Yanto ، Dede Heri Yuli Research Center for Applied Microbiology - National Research and Innovation Agency (BRIN) , Yi ، Hor Jia School of Chemical Sciences - Universiti Sains Malaysia , Mohd Kaus ، Noor Haida School of Chemical Sciences - Universiti Sains Malaysia , Ahmad ، Mohd Norazmi Experimental and Theoretical Research Lab, Department of Chemistry - International Islamic University Malaysia , Mulijani ، Sri Department of Chemistry - Bogor Agriculture University-Bogor-Indonesia
From page :
359
To page :
372
Abstract :
A series of bismuth-silicate photocatalysts were synthesized via the sol-gel method for photodegradation of methylene blue (MB) under sunlight irradiation, utilizing rice husk ash as a silica precursor. The scanning electron microscopy/energy dispersive X-ray (SEM/EDX) analysis detected Bi content in 3-10 wt% range. Furthermore, it can be seen that the porosity decreased as the Bi concentration increased. The N2 adsorption-desorption analysis indicates the presence of mesopores with an average diameter of 297-554 Å with Brunauer–Emmett–Teller (BET) surface area of 5.6-30.5 m2/g. The photocatalyst with a Bi concentration of 4 wt% (RHSBi-A2) was the most active in the photodegradation of MB; the removal reached 90% within 4 h. The photodegradation is proposed to be driven by superoxide ( ), hydroxyl (•OH) radicals, and hole (h+) based on the valence band (VB) and conduction band (CB) potentials. The porous silica framework is proposed to act as an electron reservoir, allowing better MB adsorption and enhancing light absorption.
Keywords :
Bismuth , Mesoporous silica , Methylene Blue , Photocatalyst , Rice husk , Sunlight
Journal title :
Iranian Journal of Catalysis
Journal title :
Iranian Journal of Catalysis
Record number :
2754804
Link To Document :
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