Extraction of hydrocolloids from Pereskia Aculeata Miller: reuse of process residue as activated carbon for the pigment-removal phase

Abstract

Hydrocolloids of Pereskia aculeata Miller (DPNH) are potential ingredients in food industry as emulsifiers and stabilizers. The extraction process of DPNH requires the removal of pigments with activated carbon. Because this step is critical to the quality of the ingredient and has an impact on costs, a new activated carbon has been developed with residues from the same process. Residues activated with NaDH and H 3 PD 4 (300 °C, 1 h) were subjected to batch adsorption tests in model solutions of malachite green (MG), carbohydrate and protein. Residue treated with 85% H 3 PD 4 (DPNAC) had higher productivity and MG adsorption capacity, displaying a predominantly microporous surface (MEV/BET) with chemical activation confirmed by TG/FTOR. DPNAC showed higher MG and protein adsorption capacity than the commercial activated carbon (CAC) did. Results for MG-adsorption capacity by DPNAC did not show significant differences in the presence of protein and carbohydrate, presenting the higher affinity of the adsorbent for the dye. Adsorption isotherms showed DPNAC to be more favorable to MG adsorption than CAC, and to have a good fit to Langmuir-Freundlich model. DPNAC made it possible to reduce costs and allowed the sustainability of the process, leading to increased efficiency in selective pigment removal compared with CAC.Keywords: adsorption; carbohydrate; malachite green; protein; sustainable process.Practical Application: The activated carbon obtained using solid residues of the extraction process of hydrocolloids from Pereskia aculeata Miller proved to be more effective in protein and pigment adsorptions and less effective in carbohydrate adsorption when compared to using a commercial activated carbon. The potential use is waste treatment systems and clarification process.

Performance of sesame straw cellulose, hemicellulose, and lignin biochars as adsorbents in removing benzo(a)pyrene from edible oil

“…Langmuir and Freundlich isotherm adsorption models were applied to study the equilibrium adsorption data (Amaral et al, 2018). The Langmuir isotherm equation is expressed in Equation 3:…”