Abstract
The objective of this study was to develop a low-cost and eco-friendly adsorbent from agro-industrial waste for the removal of hexavalent chromium in the aqueous medium. The adsorbent (BMC) produced from yellow mombin (Spondias mombin L.) seeds was characterized by the determination of the chemical composition, thermal analysis (thermogravimetric (TG) analysis and differential thermal analysis (DTA)), Fourier transform infrared spectroscopy (FTIR), pH in suspension and determination of the point of zero charge (PZC). The presence of proteins, fats and carbohydrates (15.690, 1.004, and 73.706%, respectively) suggests that the material can be a promising adsorbent, given the availability of functional groups. The following conditions were set: pH 2.0, adsorbent mass 450 mg, and equilibrium was reached after 80 min. The maximum adsorption capacity was approximately 98%. Kinetic studies showed that the pseudo-second-order kinetic equation was the one that best adjusted to the experimental data. Under the conditions investigated, the Langmuir isotherm model described the best balance data, signaling the adsorption in monolayer. According to the results, it was found that the BMC showed an outstanding performance for the removal of CrVI ions and may become a viable and efficient alternative for the treatment of industrial effluents containing trace elements.
Highlights
The pollution of water resources is a serious environmental problem associated with increased industrial and agricultural activity
It can be observed that, regardless of the number of isothermal parameters, the data were well adjusted for all three models. This result confirms that the Langmuir, Freundlich, and Redlich-Peterson models are relevant to describe the equilibrium established between CrVI adsorbed ions and CrVI ions remaining in solution.[21]
The adsorbent BMC was obtained by a simple methodology using biomass of yellow mombin seeds from agro-industrial residues and it is efficient in the removal of hexavalent chromium in the aqueous medium
Summary
The pollution of water resources is a serious environmental problem associated with increased industrial and agricultural activity. Such activities generate toxic compounds of various classes and in large quantities which, in many cases, are inappropriately discarded in the environment.[1,2] Various industrial processes developed in the sectors of mining, fertilizers, fuel production, paint, pigments, metal plating, tanning, paper, pulp, leather, electroplating, textiles and chemicals, can cause negative environmental impacts when by-products and effluents from their processes are improperly disposed, especially in wastewaters.[1,2,3,4].
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