Microwave biochar produced with activated carbon catalyst: Characterization and adsorption of heavy metals

Qi, Guangdou; Pan, Zhifei; Zhang, Xueyang; Chang, Shuaishuai; Wang, Hongbo; Wang, Min; Xiang, Wei; Gao, Bin

doi:10.1016/j.envres.2022.114732

Cited by 52 publications

(11 citation statements)

References 35 publications

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“…The desorption process is essential for reusing the adsorbent. In the desorption process of AC, usually, inorganic acids like HCl, HNO 3 , and H 2 SO 4 are used [9,43,54,55], but there are scarce studies about HAp regeneration possibilities. Wang et al [7] used 0.2 M HCl (pH = 0.7) for Pb(II) desorption from BC and HAp composite.…”

Section: Desorption Studiesmentioning

confidence: 99%

“…Activated carbon (AC) is a widely studied material for removing heavy metals due to its high specific surface area and effective adsorption properties. AC has relatively high affinity towards Pb(II), Cd(II), Cu(II), Ni(II), and Zn(II) [6][7][8][9]. Application of AC in powder form in the adsorption process has some disadvantages, such as agglomeration and filtration difficulties due to very fine particles that form a dense filter layer in slurry phase operations [10].…”

Section: Introductionmentioning

confidence: 99%

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Activated Carbon and Clay Pellets Coated with Hydroxyapatite for Heavy Metal Removal: Characterization, Adsorption, and Regeneration

Jurgelāne

Ločs

2023

Materials

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In the present work, activated-carbon-containing pellets were preparedby direct chemical activation of sawdust, using clays as a binder. The obtained pellets (ACC) were coated with hydroxyapatite (HAp) nanoparticles (ACC-HAp) to improve adsorption towards Pb(II), Cu(II), Zn(II), and Ni(II). The pellets were characterized by scanning electron microscopy (SEM), by Fourier transform infrared spectroscopy (FTIR), and with a gas sorptometer. The effect of pH, contact time, and initial concentration on adsorption performance was investigated. Additionally, desorption studies were performed, and the regeneration influence on compressive strength and repeated Pb(II) adsorption was investigated. The results showed that, after coating ACC pellets with HAp nanoparticles, the adsorption capacity increased for all applied heavy metal ions. Pb(II) was adsorbed the most, and the best results were achieved at pH 6. The adsorption process followed the pseudo-second-order kinetic model. The adsorption isotherm of Pb(II) is better fitted to the Langmuir model, showing the maximum adsorption capacity of 56 and 47 mg/g by ACC-HAp and ACC pellets, respectively. The desorption efficiency of Pb(II)-loaded ACC-HAp pellets increased by lowering the pH of the acid, resulting in the dissolution of the HAp coating. The best desorption results were achieved with HCl at pH 1 and 1.5. Therefore, the regeneration procedure consisted of desorption, rinsing with distilled water, and re-coating with HAp nanoparticles. After the regeneration process, the Pb(II) adsorption was not affected. However, the desorption stage within the regeneration process decreased the compressive strength of the pellets.

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Section: Desorption Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Activated Carbon and Clay Pellets Coated with Hydroxyapatite for Heavy Metal Removal: Characterization, Adsorption, and Regeneration

Jurgelāne

Ločs

2023

Materials

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“…Activated carbon usually possesses a high surface area and chemical stability. It is an ideal carrier for several applications, such as adsorption [16], catalysis [17], and electrochemistry [18]. In particular, its application in the field of electrochemistry has attracted considerable attention.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical determination of theophylline using a nickel ferrite/activated carbon-modified electrode

Thanh,

Nam,

Dung

et al. 2024

Mater. Res. Express

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In this work, a nanocomposite based on nickel ferrite/activated carbon (NiF/AC) was used to modify a highly sensitive electrochemical sensor for the quantification of theophylline (TPL) in pharmaceutical tablets. The synthesized materials were characterized using X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy-elemental mapping and surface area analysis via the Brunauer‒Emmett‒Teller method. Cyclic voltammetry was employed to study the electrocatalytic properties of the NiF/AC-GCE toward the oxidation of TPL. The dependence of the electrochemical response on the scan rate and pH was also investigated, and the working parameters were optimized. The linear range of the established electrochemical biosensor was from 0.5 to 5 μM (R2 = 0.997), with a detection limit of 0.21 μM. The present method was tested using three pharmaceutical formulation standard samples with good accuracy and acceptable recovery. Thus, it is a promising candidate for the determination of TPL in pharmaceutical formulations.

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“…Adsorption studies have been in the area of interest of contemporary science for a long time. The process of adsorption permits reduction of significant amounts of gas and liquid pollutants emitted to the environment (Lemus et al 2017;Ma et al 2022), including pesticides, detergents, organic dyes and metal ions from mono-and multi-component solutions (Ojedokun and Bello 2017;Xiang et al2020;Qi et al 2023). A large group of effective adsorbents are carbon materials of which the most popular is activated carbon (Wiśniewska et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Adsorption of cationic dye on nanostructured biocarbons: kinetic and thermodynamic study

Bazan-Woźniak

Pietrzak

2023

Appl Nanosci

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Nanostructured bio-adsorbents were prepared by physical or chemical activation of the residue of supercritical extraction of raspberry seed. Their physicochemical properties were determined by elemental analysis, low-temperature nitrogen adsorption/desorption, Boehm titration and scanning electron microscopy. The biocarbon obtained as a result of physical activation of the precursor showed basic character of the surface and its SBET was 700 m2/g. The chemical activation of the residue of supercritical extraction of raspberry seed with potassium carbonate favored generation of acidic functional groups and SBET of this biocarbon was 1177 m2/g. The nanostructured biocarbons were used for removal of Rhodamine B from its aqueous solutions. The process was best described by the Langmuir isotherm and the maximum capacity of the monolayer was 181.82 mg/g and 277.83 mg/g for the physically and chemically activated samples, respectively. The adsorption energy obtained from the Dubinin–Radushkevich isotherm indicated that the process observed was physisorption, while the kinetics of the process was best described by the pseudo-second-order model. The negative values of Gibbs free energy indicated the spontaneous character of the process. For the chemically activated sample, the highest sorption capacities toward Rhodamine B were obtained in an acidic environment, while for the physically activated sample—in a basic environment. The yield of desorption decreased for the media: distilled water > hydrochloric acid > acetic acid, which means that Rhodamine B molecules were weakly bound to the biocarbon surface.

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Microwave biochar produced with activated carbon catalyst: Characterization and adsorption of heavy metals

Cited by 52 publications

References 35 publications

Activated Carbon and Clay Pellets Coated with Hydroxyapatite for Heavy Metal Removal: Characterization, Adsorption, and Regeneration

Activated Carbon and Clay Pellets Coated with Hydroxyapatite for Heavy Metal Removal: Characterization, Adsorption, and Regeneration

Electrochemical determination of theophylline using a nickel ferrite/activated carbon-modified electrode

Adsorption of cationic dye on nanostructured biocarbons: kinetic and thermodynamic study

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