Adsorption of Acid Blue 25 on peach seed powder: Isotherm, kinetic and thermodynamic studies

Abstract

In the present study peach seed powder (PSP) was used as an adsorbent to remove Acid Blue 25 (AB25) a common basic dye, from aqueous solution. The adsorption experiments were carried out in a batch system and the effects of initial concentration, interaction time and temperature were investigated. The Langmuir, Freundlich and Temkin adsorption isotherms were used to model the equilibrium data. The kinetic parameters were determined by the pseudo first order (PFO), pseudo second order (PSO) and intra-particle diffusion (IPD) models. According to the results, the Freundlich isotherm model is a more convenient option compared with the Langmuir and Temkin models. The Freundlich model coefficients increased as the temperature increased, which shows that the adsorption process becomes more favorable with higher temperature. The experimental and calculated qe values close to one another indicated that this process fits the PSO kinetic model with higher R 2 values than the other two models. Kinetic constants become closer to both the temperatures and initial concentrations and qe values increases with the increasing concentration of AB25. The initial dye concentration increased from 25 to 150 mg L-1 , while the dye adsorption capacity onto PSP increased from 4.80 to 39.01 mg g-1 , from 5.57 to 44.27 mg g-1 and from 6.80 to 49.22 mg g-1 for 298, 308 and 323 K, respectively. The monolayer adsorption capacity (qm) of PSP was determined to be 56.18, 64.94, 95.24 mg g-1 for 298, 308 and 323 K, respectively. Thermodynamic parameters for free energy (ΔG), enthalpy (ΔH) and entropy (ΔS) of the separation process were determined as-1737,1 J mol-1 , 14.776 kJ mol-1 and 55,413 J mol-1 , respectively. The negative values of ΔG o showed that this separation process was endothermic and natural. The results of the present study demonstrated that PSP can be used as an alternative material in dye removal.

Adsorption of Acid Blue 25 on Agricultural Wastes: Efficiency, Kinetics, Mechanism, and Regeneration

“…As listed in Table 4, the Q m values of AB25 on BP and DP were much lower compared to those on modified activated carbon derived from egg shell (109.8 mg g −1 ) (Tovar-Gómez et al, 2012), lychee peel (200.0 mg g −1 ) (Bhatnagar & Minocha, 2010), tea waste activated carbon (203.3 mg g −1 ) (Auta & Hameed, 2011), Penaeus indicus shell (415.3 mg g −1 ) (Kousha et al, 2015), and pectin (719.4 mg g −1 ) (Shahrin et al, 2021). However, they were comparable or slightly higher with those on several agricultural wastes such as peach seed (95.2 mg g −1 ) (Kul et al, 2019), modified banana peel (89.5 mg g −1 ) (Guiso et al, 2014), hazelnut shells (60.2 mg g −1 ) (Ferrero, 2007), and Ficus rasemosa leaf powder (83.3 mg g −1 ) ( Jain & Gogate, 2017), and were much higher than adsorbents derived from other agricultural wastes as such as Azolla pinnata (50.5 mg g −1 ) (Kooh et al, 2016), soybean waste (38.3 mg g −1 ) (Kooh et al, 2016), walnut sawdust (37.0 mg g −1 ) (Ferrero, 2007), rubber leaf powder (28.1 mg g −1 ) (Khalid et al, 2015), Shorea dasyphylla sawdust (24.4 mg g −1 ) (Hanafiah et al, 2012), cempedak durian peel (26.6 mg g −1 ) (Dahri et al, 2016), pine sawdust (26.2) (Ferrero, 2007), oak sawdust (27.9 mg g −1 ) (Ferrero, 2007), and rambutan seed (25.6 mg g −1 ) (Lakkaboyana et al, 2018). These findings indicate that BP and DP were among the best of the potential agricultural wastes to remove negatively charged dyes from an aqueous solution.…”

“…Therefore, at ambient pH, agricultural wastes with carboxylic acid groups, would have a negative net surface charge which could suppress their electrostatic attraction to the negatively charged dyes. This assumption is supported by the low adsorption capacity of AB25, for instance, on cempedak durian peel (Dahri 2 Air, Soil and Water Research et al, 2016), pine sawdust (Ferrero, 2007), peach seed (Kul et al, 2019), powdered Ficus rasemosa leaves ( Jain & Gogate, 2017), Azolla pinnata (Kooh et al, 2016), soybean waste (Kooh et al, 2016), and rambutan seed (Lakkaboyana et al, 2018). This explanation could also apply to other negatively charged dyes such as Acid Green 25 (AG25) on durian peel (DP) (Hameed & Hakimi, 2008), Acid Violet 54 (AV54) on banana peel (BP) (Kumar et al, 2010), Congo red (CR) on BP (Mondal & Kar, 2018), and Acid violet 17 (AV17) on orange peel (Chiou & Chuang, 2006).…”

“…Because of this, the adsorptive removal of AB25 from an aqueous solution has been studied as a model for treatment of wastewater contaminated by acidic synthetic dyes. It has been investigated by employing various types of adsorbent, including activated carbons (Auta & Hameed, 2011;Tovar-Gómez et al, 2012), plants (Kousha et al, 2014), agricultural wastes such as cempedak durian peel (Dahri et al, 2016), pine sawdust (Ferrero, 2007), oak sawdust (Ferrero, 2007), peach seed (Kul et al, 2019), hazelnut shells (Ferrero, 2007), Ficus rasemosa powdered leaves ( Jain & Gogate, 2017), Azolla pinnata (Kooh et al, 2016), soybean waste (Kooh et al, 2016), walnut sawdust (Ferrero, 2007), powdered rubber leaves (Khalid et al, 2015), Shorea dasyphylla sawdust (Hanafiah et al, 2012), rambutan seed (Lakkaboyana et al, 2018), prawn shells (Kousha et al, 2015), polymer-clay nanocomposites (El-Hamshary et al, 2020), and pectin (Shahrin et al, 2021). With this library of data, it is now possible to begin to relate the adsorption behavior of AB25 to the specific surface characteristics of each agricultural waste.…”

Comparison of Acid Blue 25 Adsorption Performance on Natural And Acid – Thermal Co-Modified Bentonite: Isotherm, Kinetics And Thermodynamics Studies

“…R 2 values of three isotherm models are high, but R 2 values of the Freundlich model are higher than other model values for two types of bentonite. Previously reported results from various researchers were available for AB25 adsorption on different adsorbents and biosorbents such as; rubber leaf powder, activated carbon, diatomite, sepiolite, lychee peel, cempedak peel, soya bean waste, tarap peel, water lettuce [26].…”

Adsorption Behavior and Dynamic Interactions of Anionic Acid Blue 25 on Agricultural Waste

“…In recent years, adsorptive removal of AB25 from aqueous solution has been investigated by exploring different types of adsorbents such as polymer-clay nanocomposites [ 20 ], pectin [ 21 ], activated carbons [ 22 , 23 ], and agricultural wastes. These include banana peel and durian peel [ 11 ], sawdust [ 15 ], Shorea dasyphylla sawdust [ 24 ], oak sawdust [ 15 ], cempedak durian peel [ 25 ], rambutan seed [ 26 ], hazelnut shells [ 15 ], shrimp shells [ 27 ], peach seed [ 28 ], plant leaves [ 29 , 30 ], and soybean waste [ 31 ]. Many of the adsorbents have been demonstrated to successfully remove AB25 from water systems with high efficiency.…”