Study of the adsorption of mercury (II) on lignocellulosic materials under static and dynamic conditions

Arias, Fabian Arias; Beneduci, Amerigo; Chidichimo, Francesco; Furia, Emilia; Straface, Salvatore

doi:10.1016/j.chemosphere.2017.03.137

Cited by 99 publications

(38 citation statements)

References 64 publications

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“…The adsorption capacity (q t , the amount of adsorbed MB per unit mass of adsorbent) was determined by [44]:…”

Section: The Experiments Of Mb Adsorption On Rgomentioning

confidence: 99%

“…C e is the equilibrium concentration, and q e denotes the equilibrium adsorption capacity. The removal efficiency (RE%) of rGO can be calculated as follow [44]:…”

Section: The Experiments Of Mb Adsorption On Rgomentioning

confidence: 99%

“…The adsorption kinetics parameters were determined using the pseudo-first and pseudo-second-order models. The pseudo-first model assumes that the rate of change of the adsorption capacity is proportional to the concentration of available active sites per unit mass of adsorbent material [44,63,64], and can be calculated using the following expressions:…”

Section: Adsorption Kineticsmentioning

confidence: 99%

“…where q t is the adsorption capacity at a specific time (t) and q e represents the equilibrium adsorption capacity. In contrast, the pseudo-second model assumes that the rate of change of the concentration of occupied active sites per unit mass of the adsorbent material, is proportional to the square of the concentration of free active sites per unit mass of sorbent [44,65] and can be described as: The adsorption kinetics parameters were determined using the pseudo-first and pseudo-secondorder models. The pseudo-first model assumes that the rate of change of the adsorption capacity is proportional to the concentration of available active sites per unit mass of adsorbent material [44,63,64], and can be calculated using the following expressions:…”

Section: Adsorption Kineticsmentioning

confidence: 99%

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The Adsorption of Methylene Blue on Eco-Friendly Reduced Graphene Oxide

et al. 2020

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Recently, green-prepared oxidized graphenes have attracted huge interest in water purification and wastewater treatment. Herein, reduced graphene oxide (rGO) was prepared by a scalable and eco-friendly method, and its potential use for the removal of methylene blue (MB) from water systems, was explored. The present work includes the green protocol to produce rGO and respective spectroscopical and morphological characterizations, as well as several kinetics, isotherms, and thermodynamic analyses to successfully demonstrate the adsorption of MB. The pseudo-second-order model was appropriated to describe the adsorption kinetics of MB onto rGO, suggesting an equilibrium time of 30 min. Otherwise, the Langmuir model was more suitable to describe the adsorption isotherms, indicating a maximum adsorption capacity of 121.95 mg g−1 at 298 K. In addition, kinetics and thermodynamic analyses demonstrated that the adsorption of MB onto rGO can be treated as a mixed physisorption–chemisorption process described by H-bonding, electrostatic, and π − π interactions. These results show the potential of green-prepared rGO to remove cationic dyes from wastewater systems.

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“…The adsorption capacity (q t , the amount of adsorbed MB per unit mass of adsorbent) was determined by [44]:…”

Section: The Experiments Of Mb Adsorption On Rgomentioning

confidence: 99%

“…C e is the equilibrium concentration, and q e denotes the equilibrium adsorption capacity. The removal efficiency (RE%) of rGO can be calculated as follow [44]:…”

Section: The Experiments Of Mb Adsorption On Rgomentioning

confidence: 99%

Section: Adsorption Kineticsmentioning

confidence: 99%

Section: Adsorption Kineticsmentioning

confidence: 99%

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The Adsorption of Methylene Blue on Eco-Friendly Reduced Graphene Oxide

et al. 2020

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“…In aqueous solution, Hg(II) forms various complexes with the chlorides, i.e., HgCl + , HgCl 2 , HgCl 3 − , and HgCl 4 2− , along with the mixed species Hg(OH)Cl. In the pH region between 3.5 and 5.5, the HgCl 2 is a predominant species (i.e., over 80%) [18,19]. Meanwhile, the adsorption experiment was carried out at pH 5.0 in the presence of chloride, in which the predominant species is HgCl 2 .…”

Section: Effect Of Background Electrolyte Concentrationsmentioning

confidence: 99%

Simultaneous Removal of Hg(II) and Phenol Using Functionalized Activated Carbon Derived from Areca Nut Waste

Lalhmunsiama

Lee

Choi

et al. 2017

Metals

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Areca nut waste was utilized to obtain high surface area activated carbon (AC), and it was further functionalized with succinic anhydride under microwave irradiation. The surface morphology and surface functional groups of the materials were discussed with the help of scanning electron microscope(SEM) images and fourier transform infra-red (FT-IR) analysis. The specific surface area of the AC and functionalized-AC was obtained by the Brunauer-Emmett-Teller (BET) method, and found to be 367.303 and 308.032 m 2 /g, respectively. Batch experiments showed that higher pH favoured the removal of Hg(II), whereas the phenol removal was slightly affected by the changes in the solution pH. The kinetic data followed pseudo-first order kinetic model, and intra-particle diffusion played a significant role in the removal of both pollutants. The maximum sorption capacity of Hg(II) and phenol were evaluated using Langmuir adsorption isotherms, and found to be 11.23 and 5.37 mg/g, respectively. The removal of Hg(II) was significantly suppressed in the presence of chloride ions due to the formation of a HgCl 2 species. The phenol was specifically adsorbed, forming the donor-acceptor complexes or π-π electron interactions at the surface of the solid. Further, a fixed-bed column study was conducted for both Hg(II) and phenol. The loading capacity of the column was estimated using the nonlinear Thomas equation, and found to be 2.49 and 2.70 mg/g, respectively. Therefore, the study showed that functionalized AC obtained from areca nut waste could be employed as a sustainable adsorbent for the simultaneous removal of Hg(II) and phenol from polluted water.

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