Magnetic biochar synthesized with waterworks sludge and sewage sludge and its potential for methylene blue removal

Herein, carbon-coated magnetic nanocomposite fabricated by a lowtemperature hydrothermal method was used for methylene blue and arsenate treatment in aqueous solution. The Langmuir model fits the experimental data with a calculated maximum adsorption capacity of 110.63 and 2.31 mg g-1 for methylene blue and arsenate adsorption, respectively. Furthermore, the adsorption mechanisms of methylene blue as well as arsenate are physical adsorption and a combination of physical adsorption and chemisorption, respectively. Gibbs free energy change with negative values indicates that methylene blue and arsenate adsorption on magnetic materials occurs naturally. This research demonstrated a simple, efficient, and reliable method for removing methylene blue and arsenate.

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“…22 Furthermore, the mean pore size of CMC (6 nm) is smaller than that of BS (33 nm), attributed to the covered micropores in carbon. 23 Fig. 2.…”

Section: Characterization Of Materialsmentioning

confidence: 99%

Performance of carbon-coated magnetic nanocomposite in methylene blue and arsenate treatment from aqueous solution

Nguyen

Phan

Pham

et al. 2023

JSCS

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“…Because of its wide range of raw materials, feasibility of industrialization, a simple preparation process, and low cost, biochar has become the most promising adsorbent. 25 Considering the increasingly prominent energy crisis and the consideration of lower cost, numerous waste biomasses, such as poultry manure, 26 sludge, 27 crop waste, 28 peel, 29 and waste, 30 have been studied for the preparation of biochar for various applications.…”

Section: Introductionmentioning

confidence: 99%

Biochar Derived from Chinese Herb Medicine Residues for Rhodamine B Dye Adsorption

Zhao

et al. 2023

ACS Omega

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In this study, one well-known CHM residue (Atropa belladonna L., ABL) was used to prepare biochar capable of adsorbing rhodamine B (RhB) with an ultrahigh surface area for the first time. Three micropore-rich ABL biochars including ABL@ ZnCl 2 (1866 m 2 /g), ABL@H 3 PO 4 (1488 m 2 /g), and ABL@KOH (590 m 2 /g) were obtained using the one-step carbonization method with activation agents (ZnCl 2 , H 3 PO 4 , and KOH) via chemical activation and carbonization at 500 °C, and their adsorption performance for RhB was systematically studied with adsorption kinetics, isotherms, and thermodynamics. Through pore diffusion, π−π interaction, and hydrogen bonding, ABL biochar had excellent adsorption performance for RhB. Moreover, when C 0 was 200 mg/L, biochar dosage was 1 g/L, and the contact time was 120 min; the maximum RhB adsorption capacity and removal efficiency on ABL@ZnCl 2 and ABL@H 3 PO 4 were 190.63 mg/g, 95% and 184.70 mg/g, 92%, respectively, indicating that it was feasible to prepare biochar from the ABL residue for RhB adsorption. The theoretical maximum adsorption capacities of ABL@ZnCl 2 and ABL@H 3 PO 4 for RhB were 263.19 mg/g and 309.11 mg/g at 25 °C, respectively. Furthermore, the prepared biochar showed good economic applicability, with pay back of USD 972/t (ABL@ZnCl 2 ) and USD 987/t (ABL@H 3 PO 4 ), respectively. More importantly, even after five cycles, ABL@H 3 PO 4 biochar still showed great RhB removal efficiency, suggesting that it had a good application prospect and provided a new method for the resource utilization of traditional CHM residues. Additionally, pore diffusion, π−π interactions, and hydrogen bonding all play roles in the physical adsorption of RhB on ABL biochar. π−π interactions dominated in the early stage of RhB adsorption on ABL@H 3 PO 4 , while pore diffusion played a crucial role in the whole adsorption process on both adsorbents.

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“…In recent years, the adsorbents for removing methylene blue mainly include magnetic nanometer particles, 8 activated carbon, 9 and biomass carbon. 10 Comparatively speaking, biochar prepared from renewable biomass is more in line with the development trend of green chemistry, and is a critical way to improve environmental pollution and achieve efficient use of energy.…”

Section: Introductionmentioning

confidence: 99%

Modification of biochar by phosphoric acid via wet pyrolysis and using it for adsorption of methylene blue

Zhang

et al. 2023

RSC Adv.

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Magnetic biochar synthesized with waterworks sludge and sewage sludge and its potential for methylene blue removal

Cited by 56 publications

References 41 publications

Performance of carbon-coated magnetic nanocomposite in methylene blue and arsenate treatment from aqueous solution

Performance of carbon-coated magnetic nanocomposite in methylene blue and arsenate treatment from aqueous solution

Biochar Derived from Chinese Herb Medicine Residues for Rhodamine B Dye Adsorption

Modification of biochar by phosphoric acid via wet pyrolysis and using it for adsorption of methylene blue

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