Avocado seed powder: characterization and its application for crystal violet dye removal from aqueous solutions

Abstract

2015): Avocado seed powder: characterization and its application for crystal violet dye removal from aqueous solutions, Desalination and Water Treatment,This study presents removal of crystal violet (CV) dye from aqueous solutions using solid food waste, avocado kernel seed powder (ASP). ASP was used in the native form for biosorption study. The effects of different experimental conditions such as pH of the solution, initial dye concentration, contact time, and temperature were investigated using batch study. Maximum removal of CV (95.9 mg g −1 ) by ASP (100 mg) was observed at pH 7 and 55˚C. The kinetics data were evaluated using pseudo-first-order, pseudo-second-order, and general-order kinetic adsorption models. The general-order kinetic adsorption model gave the best description of the biosorption kinetic of CV onto ASP biosorbent. Similarly, the intraparticle diffusion plots showed three linear portions during biosorption process. Freundlich, Langmuir, and Liu models were used to analyze the isothermal data; Liu equilibrium model gave the best fit of the isothermal data of CV biosorption onto ASP. The calculations from thermodynamic studies showed that CV biosorption onto ASP was an exothermic process and a feasible process. The combined data showed that avocado seed powder could be efficiently utilized for the treatment of dyes-rich wastewaters.

Brazilian Agro-industrial Wastes as Potential Textile and Other Raw Materials: a Sustainable Approach

“…Other fruits, not shown in the diagram, stand out, such as apple, khaki, avocado, and pomegranate for the removal of dyes (Bazzo et al 2016 ; Bonetto et al 2021 ; Silveira et al 2014a , b ); the seeds of açai in the adsorption and obtaining of fibers and application in composites (de Oliveira et al 2019a , b ; Wataya et al 2016 , 2015 ; Zavarize 2021 ); cashew and acerola for bionanocomposites (Duarte et al 2015 ; Vieira Amorim et al 2021 ); cocoa husks for cellulose nanofiber (Souza et al 2019 ); and papaya and mango for the generation of enzymes for the textile industry (Okino-Delgado et al 2018 ). The cereal group also presents incidence of moreover materials, such as oat husks for the generation of nanofibrillated cellulose (Debiagi et al 2021 ).…”

A Coagulation-Flocculation Process Combined With Adsorption Using Activated Carbon Obtained From Sludge for Dye Removal From Tannery Wastewater

“…Table 2 shows the parameters adjusted from the equilibrium experiment on the adsorption of AB-210 using the Langmuir, Freundlich and Liu isotherm models. The use of R adj 2 and SD for the analysis of the goodness of fit between the experimental data in aqueous solution and various non-linear adsorption models has been reported in the literature for the comparison of models of 2 and 3 parameters [28,[34][35][36]. Based on R 2 adj as well as the SD, the best isotherm model was the Liu, that presented an SD value of 22.68 mg g -1 , which is lower when compared with the SD of Langmuir (38.60 mg g -1 ), and Freundlich (29.04 mg g -1 ).…”

Desorption of crystal violet from alkali-treated agricultural material waste: an experimental study, kinetic, equilibrium and thermodynamic modeling

“…In the past years, scientists focus their research on dye removal on agricultural wastes because these biomaterials have important characteristics for the adsorption process such as ecofriendly, no toxic, have good adsorption capacity, regenerated and reusable (Bazzo et al , 2016; Chieng et al , 2015; Dbik et al , 2020; El Messaoudi et al , 2016b; Escudero et al , 2018; Jain et al , 2020; Lakshmipathy and Sarada, 2014; Lim et al , 2015, 2016; Pavan et al , 2014; Sahmoune and Yeddou, 2016).…”