Removal of lead from two polluted soils by magnetic wheat straw biochars

Gong, Haofei; Chi, Jie; Ding, Zheng; Zhang, Fan; Huang, Jianjun

doi:10.1016/j.ecoenv.2020.111132

Cited by 32 publications

(9 citation statements)

References 57 publications

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“…Compared with the carboxyl group, the hydroxyl group had smaller binding energy and stronger metal complexing ability [118]. Furthermore, the PbFe 12 O 19 species might be attributed to the complexation between Pb 2+ and −OH group on the biochar [158].…”

Section: Surface Complexationmentioning

confidence: 99%

Adsorption of Lead from Aqueous Solution by Biochar: A Review

Wang

et al. 2022

Clean Technol.

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Industrialization has resulted in the discharge of a certain amount of lead (Pb) from industrial sources causing damage risk to water quality and human health. Adsorption is an effective technique to remove Pb, and biochar has been widely studied owing to its advantages of low cost and high adsorption capacity. This review summarizes the influence of raw materials and modification methods on the adsorption capability of biochar. The adsorption isotherms and kinetics of biochar were summarized, and the main Pb removal mechanisms were studied systematically. In addition, the challenges and future perspectives were discussed comprehensively. It is expected that the review could provide insightful fundamentals for the experimental research and practical applications of biochar.

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Section: Surface Complexationmentioning

confidence: 99%

Adsorption of Lead from Aqueous Solution by Biochar: A Review

Wang

et al. 2022

Clean Technol.

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“…To study the stripping response law of Pb 2+ in the existence of different Cu 2+ concentrations, the concentration of Pb 2+ was set with 10 gradients, which were 1,5,10,15,20,25,30,35,40, and 45 µg/L. The Cu 2+ concentration was set with seven gradients, which were 0, 1, 5, 10, 15, 20, and 25 µg/L, because the peak current of Pb 2+ was extremely small and kept decreasing when the Cu 2+ concentration exceeded 25 µg/L.…”

Section: Collection Of Pb 2+ and Cu 2+ Swasv Signalsmentioning

confidence: 99%

“…A large amount of lead ions have accumulated in soil in recent decades due to improper agricultural management, such as excessive usage of fertilizers, pesticides and sewage water irrigation [1], and the addition of wine vinasse [2,3]. Lead, as one of the most toxic heavy metals (HMs), can cause acute and chronic damage to the eco-environment even at low concentrations and harm human health because of its spreadable accumulation through food chains [4,5].…”

Section: Introductionmentioning

confidence: 99%

Coupling Square Wave Anodic Stripping Voltammetry with Support Vector Regression to Detect the Concentration of Lead in Soil under the Interference of Copper Accurately

Liu

Zhao

Liu

2020

Sensors

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In this study, an effective method for accurately detecting Pb(II) concentration was developed by coupling square wave anodic stripping voltammetry (SWASV) with support vector regression (SVR) based on a bismuth-film modified electrode. The interference of different Cu2+ contents on the SWASV signals of Pb2+ was investigated, and a nonlinear relationship between Pb2+ concentration and the peak currents of Pb2+ and Cu2+ was determined. Thus, an SVR model with two inputs (i.e., peak currents of Pb2+ and Cu2+) and one output (i.e., Pb2+ concentration) was trained to quantify the above nonlinear relationship. The SWASV measurement conditions and the SVR parameters were optimized. In addition, the SVR mode, multiple linear regression model, and direct calibration mode were compared to verify the detection performance by using the determination coefficient (R2) and root-mean-square error (RMSE). Results showed that the SVR model with R2 and RMSE of the test dataset of 0.9942 and 1.1204 μg/L, respectively, had better detection accuracy than other models. Lastly, real soil samples were applied to validate the practicality and accuracy of the developed method for the detection of Pb2+ with approximately equal detection results to the atomic absorption spectroscopy method and a satisfactory average recovery rate of 98.70%. This paper provided a new method for accurately detecting the concentration of heavy metals (HMs) under the interference of non-target HMs for environmental monitoring.

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“…These disadvantages have caused the exhaustive finding of economically low-cost alternatives like carbonaceous materials (biochars and hydrochars) prepared by thermochemical treatments of biomass wastes [9,10]. These materials can be applied in many fields, including soil amendment and adsorption of pollutants in water, soil, and atmosphere [11,12]. However, it would be interesting to extend its use to adsorption processes of pollutants in acid mine water and as catalysts in hydrometallurgical processes [13,14].…”

Section: Introductionmentioning

confidence: 99%

Influence of post-pyrolysis treatment on physicochemical properties and acid medium stability of magnetic carbon nanocomposites

Burbano

Medina

Sánchez

et al. 2022

Biomass Conv. Bioref.

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This study presents the preparation of magnetic carbon nanocomposites (MCNCs) through a two-step procedure: (i) in situ co-precipitation of magnetite (Fe3O4) nanoparticles into four different carbonaceous matrixes and (ii) post-pyrolysis treatment to coat the magnetic core. Four post-pyrolysis MCNCs were obtained: MACP (post-pyrolyzed magnetic activated carbon), MCCP (post-pyrolyzed magnetic charcoal), MHCPOR (post-pyrolyzed magnetic hydrochar from orange residue), and MBCPSFH (post-pyrolyzed magnetic biochar from sunflower husk). These four samples were compared with the starting MCNCs prepared without post-pyrolysis treatment: MAC, MCC, MHCOR, and MBCSFH, respectively. After post-pyrolysis treatment, a thin carbon layer surrounding some of the magnetite nanoparticles was identified by transmission electron microscopy. Post-pyrolysis modified the porous structure and chemical composition of MCNCs. Furthermore, a leaching test with acid sulfuric solution at 90 °C was carried out. The results suggested that the MHCPOR and MBCPSFH were more stable in an acidic medium than MACP and MCCP, indicating that the coat generated during post-pyrolysis of hydrochar and biochar could partially protect the magnetic core by reducing Fe leaching into the aqueous solution. Biochar and the hydrochar-based MCNCs before and after post-pyrolysis treatment exhibit superparamagnetic properties; however, their saturation magnetization (Ms) decreased considerably. These results open the potential application fields of MCNCs obtained by post-pyrolysis of biochar and hydrochar-based materials in acidic mediums.

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Removal of lead from two polluted soils by magnetic wheat straw biochars

Cited by 32 publications

References 57 publications

Adsorption of Lead from Aqueous Solution by Biochar: A Review

Adsorption of Lead from Aqueous Solution by Biochar: A Review

Coupling Square Wave Anodic Stripping Voltammetry with Support Vector Regression to Detect the Concentration of Lead in Soil under the Interference of Copper Accurately

Influence of post-pyrolysis treatment on physicochemical properties and acid medium stability of magnetic carbon nanocomposites

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