Zinc chloride–activated glycerine pitch distillate for methylene blue removal—isotherm, kinetics and thermodynamics

Hock, Pua Eng; Zaini, Muhammad Abbas Ahmad

doi:10.1007/s13399-020-00828-5

Cited by 10 publications

(3 citation statements)

References 20 publications

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“…Based on the R 2 values (> 0.9) presented in Table 4, for the first stage dye adsorption, the experimental data are well fitted to the intraparticle diffusion model. Moreover, C value is proportional to the extent of the boundary layer thickness and in this case, as it is higher than 0 means that intraparticle diffusion is not the only rate-controlling step and implies a certain controlling degree of film diffusion and rapid adsorption [46].…”

Section: Adsorption Kineticsmentioning

confidence: 98%

“…7. Adsorption percentage decreased with increasing initial dye concentration due to the saturation of the adsorbent surface while adsorption capacity increased due to the higher concentration gradient which acts as a driving force to overcome resistances to dye mass transfer between the aqueous phase and the solid phase [46].…”

Section: Effect Of Initial Dye Concentrationmentioning

confidence: 99%

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Preparation of activated carbon from pine (Pinus radiata) sawdust by chemical activation with zinc chloride for wood dye adsorption

Pimentel

Freire

Gómez‐Díaz

et al. 2023

Biomass Conv. Bioref.

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Wastewater containing dyes are released into water bodies generating serious problems in human health and marine life. To contribute to the solution of this problem, a novel activated carbon was prepared from untreated pine (Pinus radiata) sawdust by dry chemical activation with ZnCl2 and was used for wood dye adsorption. The carbon was characterized by point of zero charge, N2 and CO2 adsorption isotherms, SEM-EDX, and FTIR. N2 and CO2 surface areas were 471.4 and 319.5 m2 g−1, respectively, with 91% of micropores. Wood dye adsorption was studied in function of pH (2–12), adsorbent dose (0.1–4 g L−1), time (up to 48 h for blue and red and 12 h for black), and initial concentration (5–500 mg L−1). The equilibrium data for the blue and black dyes were satisfactorily fitted to the Freundlich model while those for the red dye to the Langmuir model. Kinetic data were explained by the pseudo-second order (chemisorption process) and intraparticle diffusion models. At 5 mg L−1, a 100% removal efficiency was achieved at all pH for the blue dye, whereas for the red and black, natural pH (5.1) and pH = 2, respectively, led to the best removal efficiencies, 96 and 56%. Increasing concentration above 25 mg L−1 significantly reduced adsorption efficiency for blue and red dyes. For the black dye increasing the dose to 1 g L−1, the adsorption efficiency reached 82% at 25 mg L−1. High removal efficiencies were achieved for all dyes at 25 mg L−1 and 4 g L−1.

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Section: Adsorption Kineticsmentioning

confidence: 98%

Section: Effect Of Initial Dye Concentrationmentioning

confidence: 99%

Preparation of activated carbon from pine (Pinus radiata) sawdust by chemical activation with zinc chloride for wood dye adsorption

Pimentel

Freire

Gómez‐Díaz

et al. 2023

Biomass Conv. Bioref.

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show abstract

“…From the compilation list of a large number of reported batch adsorption results at the solid/liquid interface by various reported review articles, the adsorption kinetics and equilibrium adsorption depend on many physicochemical process parameters, which include initial adsorbate concentration, adsorbent doses, solution pH, interaction between adsorbent and adsorbate, adsorbent characteristics, and temperature [2,6,24]. For example, Hock et al [25] reported the results of batch adsorption kinetics and equilibrium studies for aqueous phase malachite green (MG) by banana peel adsorbents at different physico-chemical process parameters. The biosorption mechanism of MB from water onto white pine sawdust was identified, and the effectiveness of pine sawdust adsorbent in the removal of MB at different solution pH, adsorbent doses, initial dye concentrations, and solution temperatures was tested by Salazar-Rabago et al [13].…”

Section: Introductionmentioning

confidence: 99%

Adsorptive Removal of Dye (Methylene Blue) Organic Pollutant from Water by Pine Tree Leaf Biomass Adsorbent

Sen

2023

Processes

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In this laboratory batch adsorption study, the raw pine tree leaf biomass solid waste adsorbent material was used for the removal of methylene blue (MB) dye from water at different physicochemical process conditions. The characteristics of adsorbents were determined for particle size, surface area, the existence of functional group identification, and the morphology of the adsorbent surface. The adsorption was performed at different process conditions, which include solution pH, dye concentrations, adsorbent doses, and temperature, respectively. In this study, it was found that MB dye adsorption increased with increases in solution pH and adsorbate MB dye concentration but decreased with adsorbent doses and temperature at fixed process conditions. The Langmuir isotherm model was best fitted with the experimental equilibrium data, with a higher linear regression coefficient (R2) value of 99.9% among the two widely used Langmuir and Freundlich adsorption isotherm model equations. The maximum Langmuir monolayer adsorption capacity of raw pine leaf was found to be 36.88 mg/g, which was comparable with other reported adsorbent capacities towards methylene blue (MB) dye adsorption. The value of the separation factor, RL, from the Langmuir isotherm model equation gives an indication of favorable adsorption. Thermodynamic parameters such as standard Gibbs free energy change (ΔG0), standard enthalpy change (ΔH0), and standard entropy change (ΔS0) indicated that the methylene blue (MB) dye adsorption by pine tree leaf biomass was spontaneous and exothermic in nature and that the mechanism of adsorption was mainly physical adsorption. Finally, limitations and future studies are also discussed here. The outcome of this batch adsorption study may result in the valorization of locally available large pine tree leaf residue waste, which could be used in water purification.

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Biobased carbon for effective removal of rhodamine B and Cr(VI) from aqueous solution: kinetic, isotherm and thermodynamic study

Kumbhar

Patil

Narale

et al. 2022

Biomass Conv. Bioref.

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Zinc chloride–activated glycerine pitch distillate for methylene blue removal—isotherm, kinetics and thermodynamics

Cited by 10 publications

References 20 publications

Preparation of activated carbon from pine (Pinus radiata) sawdust by chemical activation with zinc chloride for wood dye adsorption

Preparation of activated carbon from pine (Pinus radiata) sawdust by chemical activation with zinc chloride for wood dye adsorption

Adsorptive Removal of Dye (Methylene Blue) Organic Pollutant from Water by Pine Tree Leaf Biomass Adsorbent

Biobased carbon for effective removal of rhodamine B and Cr(VI) from aqueous solution: kinetic, isotherm and thermodynamic study

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