P. Acosta-Santamaría and  A. Ibatá-Soto and  A. López-Vásquez,  Evaluation of the Discoloration of Methyl Orange Using Black Sand as Semiconductor through Photocatalytic Oxidation and Reduction.   journal   = {International Journal of Chemical and Molecular Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2016, vol. 118(10). 1349 - 1353
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/10005940.