Microporous carbon with highly dispersed nano-lanthanum oxide (La2O3) for enhanced adsorption of methylene blue

Achari, V. Sivanandan; Lopez, Raichel Mary; Rajalakshmi, A S; Jayasree, S.; Shibin, O.M.; John, Deepthi; Sekkar, V.

doi:10.1016/j.seppur.2021.119626

Cited by 20 publications

(2 citation statements)

References 68 publications

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“…The removal rate of CPCM was only 87.876% after 60 min (Figure S1). The f and d orbitals of La 3+ La (III) are considered reasons for the rapid decolorization of MB by MCPCM@La 2 O 2 CO 3 . − The average adsorption capacity after equilibration was as high as 6.640 mg·g –1 in comparison to similar porous carbon materials, which was much greater than the adsorption efficiency of some porous materials made from biomass, as shown in Table . ,,− …”

Section: Resultsmentioning

confidence: 99%

Construction of Lanthanide Magnetic Bio-Based Porous Carbon Materials with Beam and Column Structure and Its Synergistic Adsorption Performance

Zhang,

Guo,

Jia

et al. 2023

ACS Appl. Mater. Interfaces

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Biochar porous carbon material (BPCM) has extraordinary adsorption properties and is being widely used in different fields around the world. The pore structure of BPCM is liable to collapse, and mechanical properties are inferior; hence, the focus is on developing a new ″powerful″ structure of functional BPCM. Rare earth elements with characteristic f orbitals are used as pore and wall strengthening units in this work. The new ″beam and column structure″ BPCM was synthesized by the aerothermal method, and then, the magnetic BPCM was prepared. The results showed that the designed synthesis route was reasonable, BPCM with a steady-state beam and column structure was attained, and the La element played a stabilizing role in maintaining the overall BPCM. The La hybridization exhibits the characteristic of ″the stronger column and weaker beam″, and the La group is the ″column″ to strengthen the BPCM as the ″beam″. The functionalized BPCM (lanthanum-loaded magnetic chitosan-based porous carbon materials, MCPCM@La2O2CO3) obtained exhibited a transcendent efficient adsorption capacity with an average adsorption rate of 6.640 mg·g–1·min–1 and over 85% removal of different types of dye pollutants, which exceeded the adsorption performance of the materials of most other BPCMs. Ultrastructural analysis revealed that MCPCM@La2O2CO3 has a huge specific surface area of 1458.513 m2·g–1 and a magnetization value of 16.560 emu·g–1 for MCPCM@La2O2CO3. A new theoretical model for the adsorption of MCPCM@La2O2CO3 (multiple adsorption coexistence equation) was established. The theoretical equations clarify that the mechanism of pollutant removal by MCPCM@La2O2CO3 is different from the traditional adsorption model, presenting a mechanism of coexistence of multiple adsorption types, displaying a monolayer–multilayer adsorption mechanism, influenced by the synergistic effects of H bonding, electrostatic attraction, π–π conjugation, and ligand interaction. The rapid coordination of the d orbitals of La is an obvious factor in enhancing the adsorption efficiency.

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Section: Resultsmentioning

confidence: 99%

Construction of Lanthanide Magnetic Bio-Based Porous Carbon Materials with Beam and Column Structure and Its Synergistic Adsorption Performance

Zhang,

Guo,

Jia

et al. 2023

ACS Appl. Mater. Interfaces

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“…Ozone enters the aqueous solution through aeration, in which the gas-liquid contact mass transfer is involved, and the gas is diffused in the water. According to classical dual-mode theory (Achari et al, 2021;Wu et al, 2021), ozone oxidation of organic matter may exist in two forms: the form of ozone gas diffuses into the liquid, reacts with organic matter at the gas-liquid interface or liquid film before entering the liquid phase, and the selectivity of ozone for such substances Strong results; another portion of unreacted ozone reacts with the organic matter through the liquid membrane into the liquid phase.…”

Section: Ozone Reaction Kineticsmentioning

confidence: 99%

Catalytic Oxidation of Methylene Blue by Attapulgite/TiO2

Shang

Jiang

Qin

et al. 2021

Front. Environ. Sci.

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Methylene blue (MB) is a common pollutant in wastewater of printing and dyeing industry. At present, ozone oxidation is commonly used in the treatment of printing and dyeing wastewater. Ozone is used for oxidation reaction directly and indirectly. However, the reaction rate is not fast enough. In this study, the attapulgite (ATP) was modified by tetrabutyl titanate-ethanol solution. The TiO2/ATP nanocomposite with high catalytic activity was prepared. The synthesized samples were subjected to characterized by X-ray diffraction (XRD) and Fourier Transform infrared spectroscopy (FTIR). The morphology and particle size of the particles were observed by scanning electron microscopy (SEM). The TiO2/ATP nanocomposite was calcined at 300°C for 2 h, and the degradation rate of 80 mg/L methylene blue was 99.8%. The experimental results show that the ozone, temperature and mass transfer factors are excluded, and the effects of temperature, MB concentration and pH on the degradation of methylene blue are investigated. The optimal reaction conditions are as follows: The ozone concentration is 0.067 g/min; the ozone flow rate is 0.15 NL/min; the stirrer rotation speed is 550 r/min; the catalyst is 0.1 g; the temperature is 50°C; Based on the results, the reaction mechanism was derived and the kinetic study of the experiment was carried out.

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Valorization of pyrolytic plastic-derived char for adsorption of wastewater contaminants: a kinetic and thermodynamic investigation

Barracco,

Parisi,

Pipitone

et al. 2024

Int. J. Environ. Sci. Technol.

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The sustainable management of plastic waste is one of the challenges of our time due to the high percentage of landfilling. One of the strategies is its thermal treatment via pyrolysis, but it is associated with the production of a char, necessitating a proper valorization pathway. In this work, we investigated for the first time the use as adsorbent of a real plastic-derived char obtained as such from a pyrolysis pilot plant. This is a novel approach with respect to literature, where the char is typically obtained as desired product. The adsorbent was characterized via several techniques, and methylene blue was chosen as representative contaminant of wastewater. The inorganic component (80 wt.%) was mainly associated with the presence of rod-like structures, rich in Si, while the organic fraction showed the occurrence of aromatic components. Under the thermodynamic point of view, Langmuir isotherm effectively fitted the experimental data (R2 = 0.98), while the kinetic results were well described by a pseudo-second-order law (R2 > 0.99). The negative Gibbs free energy highlighted that the adsorption process was spontaneous, and the enthalpy change (∆H0 = 7.18 kJ/mol) revealed the endothermic nature of the process, in a range characteristic of physisorption phenomena. Overall, this study highlights that a low-value char, derived from a real plastic waste, can be a promising valuable alternative to expensive adsorbents thanks to its adsorption capacity of 5.8 mg/g without prior activation treatments, hence being a starting point for the development of a holistic approach in plastic waste management.

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Microporous carbon with highly dispersed nano-lanthanum oxide (La2O3) for enhanced adsorption of methylene blue

Cited by 20 publications

References 68 publications

Construction of Lanthanide Magnetic Bio-Based Porous Carbon Materials with Beam and Column Structure and Its Synergistic Adsorption Performance

Construction of Lanthanide Magnetic Bio-Based Porous Carbon Materials with Beam and Column Structure and Its Synergistic Adsorption Performance

Catalytic Oxidation of Methylene Blue by Attapulgite/TiO2

Valorization of pyrolytic plastic-derived char for adsorption of wastewater contaminants: a kinetic and thermodynamic investigation

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