Impacts of pyrolysis temperature on lead adsorption by cotton stalk-derived biochar and related mechanisms

Gao, Liang; Li, Zhihe; Yi, Weiming; Li, Yufeng; Zhang, Peng; Zhang, Andong; Wang, Lihong

doi:10.1016/j.jece.2021.105602

Cited by 78 publications

(23 citation statements)

References 68 publications

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“…Another study reported that the surface area of biochar increases with increasing temperatures below 600 o C but decreases at temperatures above 700 o C . Besides, biochars produced from cotton stalks slightly increased their surface area with increasing pyrolysis temperature; however, this area decreased when the temperature increased to 650 o C due to pores collapsing and channels becoming blocked at high temperatures . The type of isotherm and the surface area are characteristic of macroporous solids with a diameter of approximately 50 nm, a result that could be ratified by SEM analysis.…”

Section: Resultssupporting

confidence: 92%

Prosopis juliflora Seed Waste as Biochar for the Removal of Blue Methylene: A Thermodynamic and Kinetic Study

et al. 2022

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In this work, we studied the methylene blue (MB) dye adsorption capacity on biochar derived from residues of Prosopis juliflora seed waste, a species found in the region of the tropical dry forest of Piojó in the Department of Atlántico, Colombia. The materials were obtained by pyrolysis at temperatures of 300, 500, and 700 °C. Biochar was characterized using Fourier transform infrared (FTIR), scanning electron microscopy and energy-dispersive X-ray spectroscopy (SEM-EDX), TGA, and Brunauer–Emmett–Teller (BET) techniques. The three biochar samples presented a macroporous, rough structure with pore size between 6 and 28 μm. The largest pore surface area observed was 1.28 m 2 /g for pyrolyzed biochar produced at 500 °C, larger than that of biochar produced at 700 °C, which was 0.83 m 2 /g. The adsorption results show that the maximum percentage of MB removal was 69%. According to SEM results, the material’s pore sizes varied on average from 6 to 28 μm. We modeled MB adsorption on biomass through three different isotherm models. The Freundlich model was the best-fitting model for the removal of MB ( K F = 1.447; 1/ n = 0.352). The kinetic results showed that the pseudo-second-order model was the best-fitting model for the sorption process ( q e = 2.94 mg/g; k 2 = 0.087 g/(mg/min –1 )). Furthermore, the recycling test showed that the biochar did not change its adsorption capacity significantly. Finally, under the experimental conditions, the thermodynamic parameters indicated that the removal of MB using biochar was an endothermic and spontaneous process; all Δ G ° values ranged from −2.14 to −0.95 kJ/mol; Δ H ° was 23.54 kJ/mol and Δ S ° was 79.5 J/mol.

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Section: Resultssupporting

confidence: 92%

Prosopis juliflora Seed Waste as Biochar for the Removal of Blue Methylene: A Thermodynamic and Kinetic Study

et al. 2022

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“…On top of all the factors that might affect the physicochemical properties of BCs (Antonangelo et al 2019;Suliman et al 2016), the pyrolysis temperature is a key parameter that would affect the quantity of functional groups, porosity and aromaticity level of biochar (Choi and Kan 2019). The dissociation energy required to decompose the functional groups is different owing to the distinct functionalities contained in biomass (Angin and Sensoz 2014;Gao et al 2021;Li et al 2019). It remains a challenge to reveal the relationship between the temperature and the biochar quality because of the various nature and composition of biomasses.…”

Section: Introductionmentioning

confidence: 99%

Impacts of temperatures and phosphoric-acid modification to the physicochemical properties of biochar for excellent sulfadiazine adsorption

Zeng

Wang²,

et al. 2022

Biochar

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The textural properties and surface chemistry of phosphoric acid-modified biochars (PABCs) prepared at different pyrolysis temperatures (500–700 °C) were studied based on the results obtained from XRD, SEM, BET, FT-IR, Raman, XPS and elements analyses. PABCs prepared at higher temperatures tended to possess a bigger proportion of microporous structure. The adsorption capacity and initial rate of PABCs for sulfadiazine (SDZ) were notably improved to 139.2 mg/g and 9.66 mg/(g min) as calculated from the Langmuir model. The adsorption equilibrium time was only one quarter of that without modification. The H3PO4 modification was advantageous to produce phosphate and break functional groups to form disordered carbon structure abundant of micropores. The enhancement in the adsorption of SDZ was due to the confinement effect of hydrophobic cavities from the mircoporous structure and the π–π electron–donor–acceptor interaction. Specially, PABCs exhibited stable adsorption capacities at a wide pH range (3.0–9.0) or relatively high concentrations of coexisting ions.

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“…It indicated that LDPE had hardly decomposed at 400 °C. When the pyrolysis temperature rose to 450 °C, the C=O and –OH groups disappeared and new bands appeared at 1568, 1412, 1017 and 874 cm −1 arising from the stretching vibrations of aromatic C=C, C–C, C–O and C–H bonds [ 5 ], suggesting the occurrence of dehydroxylation. Only the bands at 2914 and 2847 cm −1 were remarkably enhanced by the addition of LDPE at 450 °C, which resulted from the partial decomposition of LDPE.…”

Section: Resultsmentioning

confidence: 99%

“…Pyrolysis is one of the promising technologies employed for biomass, and it can convert biomass into high-value-added products, such as biogas, bio-oil and biochar. Cotton stalks-derived biochar showed the greatest potential as a soil amendment to improve the fertility of soils as well as to sequester carbon [ 4 ], and for the removal of contaminants from water [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Co-Pyrolysis of Cotton Stalks and Low-Density Polyethylene to Synthesize Biochar and Its Application in Pb(II) Removal

Yuan

Zhang

Lv³

et al. 2022

Molecules

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It is inevitable that reclaimed cotton stalks will contain a certain amount of plastic film due to the wide application of plastic mulching during the process of cotton cultivation, and this makes it inappropriate to return it to the field or for it to be processed into silage. In this study, biochars were prepared by the co-pyrolysis of cotton stalk with low-density polyethylene (LDPE) in the proportions of 1:0, 3:1, 2:1, and 1:1 (w/w) at 400 °C, 450 °C, and 500 °C and maintaining them for 1 h. The effects of the co-pyrolysis of cotton stalk with LDPE on the properties of biochars (e.g., pH, yield, elemental analysis, specific surface area, etc.) and the Pb(II) removal capacity were analyzed. Co-pyrolysis cotton stalks with LDPE could delay the decomposition of LDPE but could promote the decomposition of cotton stalk. At 400 °C and 450 °C, the addition of LDPE decreased the H/C ratio, while no significant difference was found between the pristine biochar and the blended biochar pyrolyzed at 500 °C. An FTIR analysis indicated that the surface functional groups of biochar were not affected by the addition of LDPE, except for CH3 and CH2. The results of the SEM showed that LDPE could cover the surface of biochar when pyrolyzed at 400 °C, while many macropores were found in the blended biochar that was pyrolyzed at 450 °C and 500 °C, thus increasing its surface area. The blended biochar that was pyrolyzed at 500 °C was more effective in the removal of Pb(II) than the cotton-stalk-derived biochar, which was dominated by monolayer adsorption with a maximum adsorption capacity of approximately 200 mg·g−1. These results suggested that the co-pyrolysis of cotton stalks and LDPE may be used to produce biochar, which is a cost-effective adsorbent for heavy metal removal from aqueous solutions.

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Impacts of pyrolysis temperature on lead adsorption by cotton stalk-derived biochar and related mechanisms

Cited by 78 publications

References 68 publications

Prosopis juliflora Seed Waste as Biochar for the Removal of Blue Methylene: A Thermodynamic and Kinetic Study

Prosopis juliflora Seed Waste as Biochar for the Removal of Blue Methylene: A Thermodynamic and Kinetic Study

Impacts of temperatures and phosphoric-acid modification to the physicochemical properties of biochar for excellent sulfadiazine adsorption

Co-Pyrolysis of Cotton Stalks and Low-Density Polyethylene to Synthesize Biochar and Its Application in Pb(II) Removal

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