Improvement of photocatalytic activity in the degradation of 4-chlorophenol and phenol in aqueous medium using tin-modified TiO 2 photocatalysts - Rangel-Vázquez, I.; Del Angel, G.; Ramos-Ramírez, E.; González, F.; Acevedo-Peña, Próspero; Gómez, C. Martínez; Tzompantzi, F.; Gutiérrez-Ortega, Norma; Torres-Torres, J. G. (RSC advances, 2023)