Green sustainable and highly efficient hematite nanoparticles modified biochar-clay granular composite for Cr(VI) removal and related mechanism

Zhu, Shi-En; Wang, Shuai; Yang, Xiao; Shah, Tufail; Chen, Chong; Wang, Xiang; Shang, Jianying

doi:10.1016/j.jclepro.2020.123009

Cited by 65 publications

(13 citation statements)

References 47 publications

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“…The Δ G values of the three carbons at the different experimental temperatures were all negative, and their absolute values increased with an increase of temperature (Table ), which indicated that the adsorptions of Cr 6+ by biochar were spontaneous, and the increases of temperature were beneficial to adsorption . However, the absolute values of Δ G at the same temperatures were reduced as the initial concentrations increased (Table ), indicating that the mass transfer driving force was not the factor that controlled the adsorption process.…”

Section: Resultsmentioning

confidence: 99%

Adsorption Mechanism of Hexavalent Chromium on Biochar: Kinetic, Thermodynamic, and Characterization Studies

et al. 2020

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The adsorption mechanism of Cr 6+ on biochar prepared from corn stalks (raw carbon) was studied by extracting the organic components (OC) and inorganic components (IC). Scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy were used to characterize the properties of three kinds of carbon. Kinetic and thermodynamic experiments were performed. The results showed that the experimental data were fitted well by the Freundlich model and the pseudo-second-order kinetic model, and the adsorptions on the three kinds of carbon were all spontaneous, endothermic processes. The adsorption of Cr 6+ by biochar was in accordance with a chemisorption process. The adsorption contribution rate of the OC was 97%, which was much higher than that of the IC. Electrostatic attraction and redox reaction were the main mechanisms of adsorption, and among them, the contribution rate of the redox reaction accounted for 61.49%. The reduced Cr 3+ could both exchange ions with K + and dissociate into solution by electrostatic repulsion; the amount of Cr 3+ released into the solution was approximately 17.07 mg/g, and the amount of Cr 3+ ions exchanged with K + was 0.29 mg/g. These results further elucidate the adsorption mechanism of Cr 6+ by biochar.

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Section: Resultsmentioning

confidence: 99%

Adsorption Mechanism of Hexavalent Chromium on Biochar: Kinetic, Thermodynamic, and Characterization Studies

et al. 2020

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“…Clay minerals can be mined easily, non-toxic, lamellar structures, relatively low cost, and comparatively high surface area. In general, mineral modification encompasses impregnation of biochar with different minerals, such as birnessite , montmorillonite (Song et al 2020), kaolinite (Xu et al 2021b), hematite (Zhu et al 2020b), ferrihydrite (Huang et al 2020), and goethite (Zhu et al 2020c). Kashif Irshad et al (2020) investigated how different biochar (BC) and goethite-modified biochar (GB) modifications affect the mobility of Cd and transfer in the soil-rice structure.…”

Section: Biochar-based Compositesmentioning

confidence: 99%

Biochar for the removal of contaminants from soil and water: a review

Qiu

Liu

Ling

et al. 2022

Biochar

381

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Biochar shows significant potential to serve as a globally applicable material to remediate water and soil owing to the extensive availability of feedstocks and conducive physio-chemical surface characteristics. This review aims to highlight biochar production technologies, characteristics of biochar, and the latest advancements in immobilizing and eliminating heavy metal ions and organic pollutants in soil and water. Pyrolysis temperature, heat transfer rate, residence time, and type of feedstock are critical influential parameters. Biochar’s efficacy in managing contaminants relies on the pore size distribution, surface groups, and ion-exchange capacity. The molecular composition and physical architecture of biochar may be crucial when practically applied to water and soil. In general, biochar produced at relatively high pyrolysis temperatures can effectively manage organic pollutants via increasing surface area, hydrophobicity and microporosity. Biochar generated at lower temperatures is deemed to be more suitable for removing polar organic and inorganic pollutants through oxygen-containing functional groups, precipitation and electrostatic attraction. This review also presents the existing obstacles and future research direction related to biochar-based materials in immobilizing organic contaminants and heavy metal ions in effluents and soil. Graphical Abstract

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“…The band at 1,105.98 cm -1 can be attributed to C-O vibration from carboxylate functional group while the band at 1,688.25 cm -1 probably due to the C-H vibration of alkyl. The bands at 582.75 cm -1 indicates the existence of Fe-O bending mode [27]. This result indicates that there is a difference in the FT-IR spectrum between biochar and HBN where Fe-O vibration is only found in HBN [25], according to Eq.…”

Section: Figure 2 Ft-ir Spectrum Of Biocharmentioning

confidence: 89%

Physicochemical and photodegradation characteristics of hematite-biochar nanocomposite prepared from bamboo sawdust

Astuti

Musfiroh

Yahya

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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This work implicates the synthesis of biochar-hematite nanocomposite from bamboo sawdust and its photodegradation characteristic for remazol brilliant blue. The nanocomposite was prepared through a one-step pyrolysis process in a tubular furnace under a flow of nitrogen and impregnation using FeSO4.7H2O and FeCl3.6H2O. The physicochemical properties were characterized by x-ray diffraction and Fourier transform infrared spectroscopy, which confirmed that hematite was successfully identified on the surface of the nanocomposite. The results also show that the nanocomposite is suitable for photodegradation application. The decolorization of remazol brilliant blue is suitable with the Langmuir isotherm model and pseudo-second-order kinetic model. At pH = 1, initial concentration = 200 mg/L, contact time = 60 minute and nanocomposite dosage 0.4 g/L, the decolorization efficiency reached 96.9%.

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Green sustainable and highly efficient hematite nanoparticles modified biochar-clay granular composite for Cr(VI) removal and related mechanism

Cited by 65 publications

References 47 publications

Adsorption Mechanism of Hexavalent Chromium on Biochar: Kinetic, Thermodynamic, and Characterization Studies

Adsorption Mechanism of Hexavalent Chromium on Biochar: Kinetic, Thermodynamic, and Characterization Studies

Biochar for the removal of contaminants from soil and water: a review

Physicochemical and photodegradation characteristics of hematite-biochar nanocomposite prepared from bamboo sawdust

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