KOH-activated carbon prepared from sucrose spherical carbon: Adsorption equilibrium, kinetic and thermodynamic studies for Methylene Blue removal

Bedin, Karen C.; Martins, Alessandro F.; Cazetta, André L.; Pezoti, Osvaldo; Almeida, Vitor C.

doi:10.1016/j.cej.2015.10.099

Cited by 529 publications

(155 citation statements)

References 57 publications

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“…Bedin et al . synthesized activated carbon (AC) from sucrose using hydrothermal and subsequent KOH treatments, achieving q m of 704 mg/g for dye MB with surface area of AC enlarged up to 1534 m 2 /g30.…”

Section: Resultsmentioning

confidence: 99%

Adsorption of methylene blue on an agro-waste oiltea shell with and without fungal treatment

Liu

Xiaojuan

et al. 2016

Sci Rep

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A lignocellulosic waste oiltea shell (OTS) was evaluated as an inexpensive sorbent to remove methylene blue (MB) from aqueous solution. Fungal treatment of OTS increased the MB adsorption by modifying the physicochemical properties of OTS and simultaneously produced laccase as a beneficial co-product. Without fungal treatment, the maximum amount of adsorption (qm) of MB by OTS was 64.4 mg/g, whereas the treatment with fungus Pycnoporus sp. and Trametes versicolor increased qm up to 72.5 mg/g and 85.7 mg/g, respectively. This is because of the improved surface area and pore sizes as well as altered chemical compositions. The equilibrium sorption data for OTS both with and without treatment fitted to the Langmuir model, and the sorption rate data well fitted to the pseudo second-order kinetic model. The changes in free energy (ΔG°) and separation factor (RL) indicated that the sorption was spontaneous and favorable. Scanning electron microscopy and Fourier transform infrared spectroscopy showed the changes in the surface morphology and functional groups of OTS after fungal treatment. The agro-waste OTS could be utilized as a low-cost adsorbent for efficient dye removal, and fungal treatment can serve as a mild and clean technique to increase the adsorptive capacity of OTS.

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Section: Resultsmentioning

confidence: 99%

Adsorption of methylene blue on an agro-waste oiltea shell with and without fungal treatment

Liu

Xiaojuan

et al. 2016

Sci Rep

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“…As a cationic dye, methylene blue (MB) that is hard to degrade by traditional technologies can cause various potential health risks to humans and induce significant problems to ecological systems [15,16]. The removal kinetics and mechanisms of MB under different conditions (such as various impact factors and real waters) using chemical [13,[17][18][19] and physical technologies [15][16][17][18][19] have been discussed with drawbacks of the generation of iron sludge, difficulties in separation and regeneration of catalysts, membrane fouling, and high cost. UV-based AOPs were found to be highly efficient for removing MB, which is commonly used as a model organic pollutant J o u r n a l P r e -p r o o f [13,[15][16][17][18][19] with good stability under UV irradiation and easy detection.…”

Section: Introductionmentioning

confidence: 99%

Methylene blue degradation by the VUV/UV/persulfate process: Effect of pH on the roles of photolysis and oxidation

Wen

et al. 2020

Journal of Hazardous Materials

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Graphical Abstract Highlights  VUV/UV/persulfate (VUV/UV/PS) process obviously enhanced methylene blue degradation. VUV UV HO • other SO 4 •-J o u r n a l P r e -p r o o f  Degradation and mineralization of methylene blue exhibited different trends with pH. HO • and SO4 •were proved to be the principal reactive oxygen species. The application potential of VUV/UV/PS process was demonstrated in real waters. Solution pH notably affected photon absorption distributions and reaction mechanism. AbstractThis study investigated methylene blue (MB) degradation by the vacuumultraviolet/ultraviolet/persulfate (VUV/UV/PS) process using a mini-fluidic VUV/UV photoreaction system. Results show that MB degradation by the VUV/UV/PS process was significantly higher than that of the conventional UV/PS process, as the VUV photolysis of H2O and PS generated more reactive oxygen species (ROSs). HO • and SO4 •-, identified as the main ROSs, were mostly consumed by dissolved organic carbon and Clin real waters, respectively. Additionally, the impacts of solution pH and the concentrations of PS, humic acid, and inorganic ions (HCO3 -, Cl -, NO3 -, SO4 2-, Fe(II), and Fe(III)) were systematically evaluated. The solution pH significantly affected the photon absorption distributions, as well as the contributions of photolysis and oxidation to MB degradation, resulting in different variations in the degradation rate constant and total organic carbon removal ratio with increasing solution pH. At all tested pH levels (3.0-11.0), particularly under acidic conditions, HO • and SO4 •were two predominant contributors to MB degradation, while VUV and UV photolysis contributed more when the solution pH increased. This study provides a highly efficient process for organic J o u r n a l P r e -p r o o f pollutant removal, which could be applied in water treatment. S O 2 SO ( 1.4) hv        (1) Low-pressure (LP) mercury lamps are a highly efficient UV light source for water treatment, with a photon-energy efficiency of approximately 36% [12]. By using J o u r n a l P r e -p r o o f

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“…Further, the peak at 1540 cm −1 represents C-CH 2 and C-CH 3 groups [37,38]. The peak at 1171 and 502 cm −1 can suggest the presence of carbonyl group (C-O) onto the adsorbents, which can be attributed to alcohols, phenols, acids, and other esters [39,40]. Comparison of the peaks developed for PPC and PPAC indicates that following the activation, OH groups have been developed onto the adsorbent's surface.…”

Section: Resultsmentioning

confidence: 99%

Facile preparation of porous activated carbon under ultrasonic assistance for the Methylene blue removal from aqueous environment: characterization, isothermal, kinetic and thermodynamic studies

Eslami

Khosravi

Miri

et al. 2020

Mater. Res. Express

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Powdered Peganum Harmala activated carbon (PPAC) was synthesized by a new activation method using ultrasonic waves (with a frequency of 37 KHz for 1 h) after carbonization and application to remove methylene blue (MB) from aqueous solutions. In this experiment, the characteristics of the PPAC were examined through BET, FESEM, and FTIR spectrum. The effects of the initial pH (2-12), the adsorbent's dose (0.5-4 g L −1 ), reaction time (2-80 min), initial concentration of the dye (50-300 mg l −1 ), mixing rate (0-300 rpm), and the solution's temperature (10°C-50°C) in adsorption process were investigated. The results indicated that ultrasonic waves have the significant effect on the carbon activating process. BET analysis indicated that the specific surface area of PPAC before activation was 0.776 m 2 g −1 and had increased to 442.14 m 2 g −1 following activation by ultrasonic waves. FESEM images showed that significant elevation of the porosity level and development of numerous pores in the activated carbon. FTIR analysis indicates that following the activation, -OH groups have been developed onto the PPAC surfaces. The adsorption isotherms and kinetics were well fitted by the Freundlich and pseudo-second order model. Investigation of thermodynamic parameters indicated that adsorption process of MB by PPAC is spontaneous, endothermic, and physical.final concentration of methylene blue (mg l −1 ) C t MB concentrations at time t of reaction (mg l −1 ) k 1 pseudo-first order rate constant (1 min −1 ) k 2 pseudo-second order rate constant (mg (g min) −1 ) K f Freundlich adsorbent capacity (mg g −1 (l mg −1 )

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KOH-activated carbon prepared from sucrose spherical carbon: Adsorption equilibrium, kinetic and thermodynamic studies for Methylene Blue removal

Cited by 529 publications

References 57 publications

Adsorption of methylene blue on an agro-waste oiltea shell with and without fungal treatment

Adsorption of methylene blue on an agro-waste oiltea shell with and without fungal treatment

Methylene blue degradation by the VUV/UV/persulfate process: Effect of pH on the roles of photolysis and oxidation

Facile preparation of porous activated carbon under ultrasonic assistance for the Methylene blue removal from aqueous environment: characterization, isothermal, kinetic and thermodynamic studies

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