KOH activated carbons from Brazil nut shell: Preparation, characterization, and their application in phenol adsorption

Silva, Maria C. F. Da; Schnorr, Carlos Eduardo; Lütke, Sabrina F.; Knani, Salah; Nascimento, Victoria X.; Lima, Éder C.; Thue, Pascal S.; Vieillard, Julien; Silva, Luis; Dotto, Guilherme Luiz

doi:10.1016/j.cherd.2022.09.012

Cited by 38 publications

(11 citation statements)

References 53 publications

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“…They found out that the increase in the weight ratio of NiCl 2 led to an increase in the surface area and total pore volume of the obtained material. In addition, several other authors found that increasing the proportion of transition metal chlorides, such as ZnCl 2 , FeCl 3 , CoCl 2 , and CuCl 2 , led to improved textural properties [ 40 , 46 , 47 , 48 , 49 , 50 ]. The transition metals impregnated in the precursor material are cross-linked to the surface functional groups of the biomass, promoting the chemical dehydration and decomposition of the lignocellulosic material during pyrolysis.…”

Section: Resultsmentioning

confidence: 99%

Adsorptive Features of Magnetic Activated Carbons Prepared by a One-Step Process towards Brilliant Blue Dye

et al. 2023

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Water pollution by dyes has been a major environmental problem to be tackled, and magnetic adsorbents appear as promising alternatives to solve it. Herein, magnetic activated carbons were prepared by the single−step method from Sapelli wood sawdust, properly characterized, and applied as adsorbents for brilliant blue dye removal. In particular, two magnetic activated carbons, MAC1105 and MAC111, were prepared using the proportion of biomass KOH of 1:1 and varying the proportion of NiCl2 of 0.5 and 1. The characterization results demonstrated that the different proportions of NiCl2 mainly influenced the textural characteristics of the adsorbents. An increase in the surface area from 260.0 to 331.5 m2 g−1 and in the total pore volume from 0.075 to 0.095 cm3 g−1 was observed with the weight ratio of NiCl2. Both adsorbents exhibit ferromagnetic properties and the presence of nanostructured Ni particles. The different properties of the materials influenced the adsorption kinetics and equilibrium of brilliant blue dye. MAC111 showed faster kinetics, reaching the equilibrium in around 10 min, while for MAC1105, it took 60 min for the equilibrium to be reached. In addition, based on the Sips isotherm, the maximum adsorption capacity was 98.12 mg g−1 for MAC111, while for MAC1105, it was 60.73 mg g−1. Furthermore, MAC111 presented the potential to be reused in more adsorption cycles than MAC1105, and the use of the adsorbents in the treatment of a simulated effluent exhibited high effectiveness, with removal efficiencies of up to 90%.

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Section: Resultsmentioning

confidence: 99%

Adsorptive Features of Magnetic Activated Carbons Prepared by a One-Step Process towards Brilliant Blue Dye

et al. 2023

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“…The regeneration process is carried out after the desorption process first. Many studies have been reported using desorption reagents in the form of chemical reagents that are not environmentally friendly such as ethanol, methanol, and sodium hydroxide (Da Silva et al, 2022;Qu et al, 2022;Said et al, 2021). The use of desorption reagents in the form of chemical reagents will indeed desorb the adsorbate maximally but will cause new problems, namely the remaining reagents after the desorption process which will make new waste.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Effectiveness on Phenol Removal by MgCr-LDH/Microcrystalline Cellulose Composite and Regeneration Study with Green Desorption Reagent

Yuliasari

Wijaya

Mohadi

et al. 2023

Sci. Technol. Indones

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Modified MgCr-LDH with microcrystalline cellulose (MgCr/MCC) was successfully prepared by the coprecipitation method and characterized using XRD, FT-IR, and BET analyses. MgCr/MCC showed an increase in surface area from 21.51 to 26.056 m2/g. The material was tested as an adsorbent for the removal of phenol. MgCr/MCC showed an increase in adsorption capacity from the initial material of 24.631 to 58.480 mg/g. The optimum pH was at pH 9 and the adsorption process’s equilibrium time is 70 minutes. The correlation coefficients on the kinetics and isotherm parameters show that phenol removal follows the pseudo second order (PSO) and Langmuir models with spontaneous and endothermic adsorption processes. The regeneration ability of MgCr/MCC material using the water-assisted ultrasonic system as a green desorption reagent was 3 cycles with a percent regeneration efficiency of 39.45%.

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“…Various ways that can be done to remove phenolic compounds in wastewater include using photocatalyst, chemical and electrochemical oxidation, reverse osmosis, biological removal, photocatalyst, and adsorption methods (da Silva et al, 2022;Dehmani et al, 2023). Among the various methods above, the adsorption method is the most promising method for the removal of phenolic compounds in wastewater due to its high removal efficiency, simple application, flexibility, low cost (Haydari et al, 2023) .…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Phenol from Aqueous Solution Using Zn/Al Layered Double Hydroxides-Cellulose Composite

Mohadi¹,

Amri

Badaruddin

et al. 2023

Sci. Technol. Indones

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The successful synthesis and preparation of Zn/Al layered double hydroxide, cellulose, and Zn/Al-cellulose materials were analyzed using XRD, FT-IR, and BET. The diffraction peaks of Zn/Al layered double hydroxide are at 10.3°; 20.3°; 34.8°; and 60.40°, while the diffraction peaks of cellulose are at 15.5°; 22.4°; and 34.5°. Diffraction peaks on Zn/Al layered double hydroxide and cellulose were observed at 3442 cm-1, 1642 cm-1, 1440-1620 cm-1, 1351 cm-1, 1153 cm-1, and 400-800 cm-1. The surface area of the material after the composite increased from 1.968 to 13.615 m2/g. The optimum pH for Zn/Al LDH was pH 4, pH 10 for cellulose, and pH 2 for Zn/Al-cellulose. The isotherm data of Zn/Al LDH and cellulose followed the Freundlich model, while Zn/Al-cellulose followed the Langmuir model. The reuse of adsorbents in the adsorption process can be used up to 3 times.

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KOH activated carbons from Brazil nut shell: Preparation, characterization, and their application in phenol adsorption

Cited by 38 publications

References 53 publications

Adsorptive Features of Magnetic Activated Carbons Prepared by a One-Step Process towards Brilliant Blue Dye

Adsorptive Features of Magnetic Activated Carbons Prepared by a One-Step Process towards Brilliant Blue Dye

Enhanced Effectiveness on Phenol Removal by MgCr-LDH/Microcrystalline Cellulose Composite and Regeneration Study with Green Desorption Reagent

Adsorption of Phenol from Aqueous Solution Using Zn/Al Layered Double Hydroxides-Cellulose Composite

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