Semprún, L., Solano, R., Sánchez, J., Carruyo, G., RamosM. íngel, Enao, J.A., Atencio, R., Bandosz, T., Seredych, M. and Moronta, A. 1. Removal of H2S using a natural clay modified with a surfactant and incorporating Cu, Fe and Zn into the structure. Rev. Téc. Fac. Ing. Univ. Zulia. 34, 1 (1).