Synthesis, Characterization and Photocatalytic Activity of β-Ca2-xZnxSiO4 (x = 0, 0.01 and 0.025)

Maximus Pranjoto Utomo*, Mohammad Shobirin and Anti Kolonial Prodjosantoso

Department of Chemistry, Yogyakarta State University, Yogyakarta, DIY 55281, Indonesia

*Corresponding author: E-mail: pranjoto_utomo@uny.ac.id

Abstract

The compound of β-Ca2SiO4 has been considered as one of the important portand cement components. The existence of metals in the cement raw materials causes β-Ca2-xMxSiO4 formation possibility. The β-Ca2-xZnxSiO4 (x = 0, 0.01 and 0.025) has been prepared and characterized, and aplied for degradation of Congo red. The samples were synthesized by heating stoichiometric amounts of Zn(NO3)2·6H2O, CaCO3 and SiO2 at 950 ºC for 4 h followed by air quenching. The samples were characterized by using XRD, SEM, EDA and UV-visible spectroscopic methods. The XRD patterns indicate that the samples are isomorphous with β-Ca2SiO4. The SEM micrographs depicted the aggregated irregular shape particles having size about 0.2 μm. The EDA measurements revealed that the bulk compositions of materials are as expected. The doping of zinc increases the Eg of the sample and decreases the photocatalytic power for degradation of Congo red under sunlight.

Keywords

Portland Cement, Dicalcium silicate, Zn doping, Congo red

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