Removal of diphenols using pine biochar. Kinetics, equilibrium, thermodynamics, and mechanism of uptake

Cimirro, Nilton Fabiano Gelos Mendes; Lima, Éder C.; Cunha, Mariene R.; Thue, Pascal S.; Grimm, Alejandro; Reis, Glaydson S. dos; Rabiee, Navid; Saeb, Mohammad Reza; Keivanimehr, Farhad; Habibzadeh, Sajjad

doi:10.1016/j.molliq.2022.119979

Cited by 67 publications

(45 citation statements)

References 64 publications

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“…The t 1/2 and t 0.95 are defined as the time to attain 50% and 95% of the saturation of the adsorbent [ 19 , 52 ]. Considering that Avrami fractional order was the best-fitted model, it could be established that the values of these time parameters were more confident than the other models.…”

Section: Resultsmentioning

confidence: 99%

“…For the set of four temperatures and two biosorbents, the Liu model was the best isotherm model for describing the uptake of Nd(III) onto both biosorbents. Except for LEB-18 at 298K, all values of ΔBIC between Langmuir and Liu and Freundlich and Liu were > 10, indicating that surely the Liu isotherm model was the best isotherm for describing the adsorption of Nd(III) onto LEB-18 Spirulina platensis and LEB-52 Spirulina platensis algae [ 19 , 38 , 52 ]. For the LEB-18 strain at 298 K, the ΔBIC was 5.74, indicating that the Liu isotherm model might be the best choice of the isotherm model [ 19 , 38 , 52 ].…”

Section: Resultsmentioning

confidence: 99%

“…Except for LEB-18 at 298K, all values of ΔBIC between Langmuir and Liu and Freundlich and Liu were > 10, indicating that surely the Liu isotherm model was the best isotherm for describing the adsorption of Nd(III) onto LEB-18 Spirulina platensis and LEB-52 Spirulina platensis algae [ 19 , 38 , 52 ]. For the LEB-18 strain at 298 K, the ΔBIC was 5.74, indicating that the Liu isotherm model might be the best choice of the isotherm model [ 19 , 38 , 52 ]. The R 2 adj and SD values of the Liu isotherm model were also closer to 1 and minimum values, respectively, confirming that the Liu isotherm model was the best choice.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 5 shows at left the isotherms of adsorption of Nd(III) onto LEB-18 strain ( Figure 5 a) and LEB-52 strain ( Figure 5 b) at 25 °C. On the right, Figure 5 c (LEB-18) and Figure 5 d (LEB-52) show the nonlinear Van’t Hoff curves for the determination of the thermodynamic parameters of adsorption of Nd(III) onto both biosorbents [ 19 , 38 , 52 ].…”

Section: Resultsmentioning

confidence: 99%

“…The values of ΔH° and ΔS° of adsorption are depicted in Table 5 and Figure 6 c,d. The

was obtained as previously recommended [ 19 , 38 , 52 ] based on the best-fitted isotherm model (Liu), see Supplementary Material . According to the thermodynamic data, the adsorption process was favorable (ΔG° < 0 for all the studied temperatures) and exothermic (ΔH° < 0).…”

Section: Resultsmentioning

confidence: 99%

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Biosorption of Neodymium (Nd) from Aqueous Solutions Using Spirulina platensis sp. Strains

et al. 2022

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Rare earth elements such as neodymium (Nd) are important elements used mainly in developing new technologies. Although they are found in low concentrations in nature, they can be obtained by extracting solid samples such as phosphogypsum. Among the techniques, adsorption has been used successfully with several adsorbent materials. In this work, two strains of Spirulina platensis (LEB-18 and LEB-52) were employed as biosorbents for efficiently removing the Nd element from the aqueous media. Biosorption tests were carried out in a batch system, and the results of the biosorption kinetics showed that for both materials, the biosorption of Nd was better described by the Avrami model. Moreover, it could be considered that 80 min would be necessary to attain the equilibrium of Nd(III) using both biosorbents. The result of the biosorption isotherms showed that for both strains, the best-fitted model was the Liu model, having a maximum biosorption capacity of 72.5 mg g−1 for LEB-18 and 48.2 mg g−1 for LEB-52 at a temperature of 298 K. Thermodynamics of adsorption showed that for both LEB-18 and LEB-52 the process was favorable (∆G° < 0) and exothermic (∆H° −23.2 for LEB-18 and ∆H° −19.9 for LEB-52). Finally, both strains were suitable to uptake Nd, and the better result of LEB-18 could be attributed to the high amount of P and S groups in this biomass. Based on the results, a mechanism of electrostatic attraction of Nd3+ and phosphate and sulfate groups of both strains of Spirulina platensis was proposed.

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Section: Resultsmentioning

confidence: 99%