Abstract
The effect of temperature on the adsorption of Cr (VI) was determined with waste materials from the agroindustry, such as palm bagasse and plantain peels, by determining the thermodynamic parameters which allow to establish the mechanisms that control the process. The methodology included an initial preparation of the biomass, its characterization, and subsequent adsorption tests by setting the initial concentration of the metal to 100 ppm, a particle size of 0,5 mm, a biomass amount of 0,325 g, pH 2, and a volume of 100 mL. The process temperature varied between 303,15, and 352,15 K. The concentration of the remaining metal in the solution was performed using the diphenyl carbazide colorimetric method through a UVVis spectroscopy at a wavelength of 540 nm. The results show that the effect of temperature does not present a defined trend for palm bagasse, whereas it is linear for adsorption using plantain peels. Furthermore, the process of adsorption of Cr (VI) with palm bagasse is more favorable at higher temperatures, since it is a spontaneous process with a physical adsorption mechanism. On the other hand, the adsorption process with plantain peels is thermodynamically feasible at temperatures from 40 to 55 °C and not spontaneous at higher temperatures. Also, a physicochemical adsorption mechanism was evinced. It is concluded that the use of the studied materials is possible in the removal of the Cr (VI) ion in aqueous solutions.
Highlights
Chromium and its compounds are toxic when introduced in natural water from a variety of industrial wastes
It was found that the adsorption kinetics of Cr(VI) at different temperature values on oil palm bagasse was adjusted to the pseudo-second order model
From the Brunauer-Emmett-Teller (BET) analysis, it was found that the plantain peel has a larger surface area: 3,0889 m2/g compared to 2,7317 m2/g of palm bagasse
Summary
Chromium and its compounds are toxic when introduced in natural water from a variety of industrial wastes These materials accumulate in the food chain and affect living organisms in the ecosystem (Jain et al, 2018; CarreñoSagayo, 2016). Contamination in water currents by Cr(VI) represents a threat to animal and human health, as it can cause lung cancer, ulcers, perforations of the nasal septum, and kidney damage (Razi, Al-Gheethi, and Za, 2018). Due to such mutagenic and carcinogenic properties in living tissues, Chromium is one of the most harmful metals. It is included in the priority list of hazardous substances of the World Health Organization (WHO), with permissible limits of 0,05 ppm and 0,1 ppm established in drinking and inland water, respectively (Jain et al, 2018; Haroon et al, 2016)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
