Abstract

RAMOS H, Witney; DELGADO-SARMIENTO, Pavel  and  MIRANDA R, Lilia. Evaluación de nanofiltros con diatomita para la remoción de cadmio en muestras de agua del río Tambo-Arequipa. Rev. Bol. Quim [online]. 2022, vol.39, n.1, pp.10-18. ISSN 0250-5460.  https://doi.org/10.34098/2078-3949.39.1.2.

Cadmium is a highly toxic heavy metal with a current price of 60 usd/kg, Peru being the 8th world producer with an annual yield of 771 metric tons in 2019. Its presence in natural waters and mining effluents as Cd (II) ions ), is an environmental problem of increasing magnitude. The environmental quality standard (ECA) for water intended for human consumption in Peru, Supreme Decree No. 004-2017- MINAM, indicates 0.005 mg/L for cadmium. Diatom was used as Cd(II) adsorbent through a chemisorption process. The experimental tests were carried out in a batch system from water obtained during the monitoring that was done in the Tambo River. The independent variables that could be measured were the pH, the mass of the adsorbent and the contact time between the two phases. From the proposed experimental design, a maximum removal of Cadmium (II) of 99.3% was achieved in experiments 3, 4, 6, 7 and 8 under constant agitation of 1400 rpm. The mathematical model was obtained from the 2k factorial design of two levels and three factors, with three repetitions in the central point. In the present investigation, tests were carried out with a Scanning Electron Microscope (SEM) before and after adsorption. Thus, it was found that diatoms activated with 5% nitric acid have a high adsorption power against Cadmium (II) ions.

Keywords : Nanofilters; Biosorption; Cadmium; Diatoms; Diatomite.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )