Limatahu, Nur A., et al. “Adsorption and Photodegradation of Methylene Blue by Allophane and Nanocomposite Bismuth Oxyiodide-Allophane”. Asian Journal of Chemistry, vol. 30, no. 1, Dec. 2017, pp. 207-9, doi:10.14233/ajchem.2018.20990.