KOH-activated porous biochar with high specific surface area for adsorptive removal of chromium (VI) and naphthalene from water: Affecting factors, mechanisms and reusability exploration

Qu, Jianhua; Wang, Yuxin; Tian, Xue; Jiang, Zhao; Deng, Fengxia; Tao, Yue; Jiang, Qing; Wang, Lei; Zhang, Ying

doi:10.1016/j.jhazmat.2020.123292

Cited by 292 publications

(68 citation statements)

References 44 publications

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“…Figure 5 The mechanisms involved in MB adsorption onto mineral-biochar composites oxygen and hydrogen content were the controlling properties of mineral-biochar composites to adsorb MB. To increase the adsorption capacity of MB, it may be necessary to apply pore reaming and surface modification coupled methods (such as physical activation-steaming exploration (Miao et al, 2019), chemical activation-KOH activation (Qu et al, 2021)) to produce a composite with higher pore volume and increase the oxygen and hydrogen content. Further research will explore the relationship between adsorbent properties and coexistence of multiple pollutants with different nature, then developing and designing the upgraded biochar to removal pollutants with maximum capacity.…”

Section: Comparison With Other Reported Adsorbentsmentioning

confidence: 99%

Characterization and adsorption applications of composite biochars of clay minerals and biomass

Gao

Goldfarb

2021

Environ Sci Pollut Res

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Composite mineral-biochars of a homogeneous biomass (cellulose) and heterogeneous biomass (oak leaves) were fabricated with either 5wt% or 10wt% minerals (montmorillonite (MMT), kaolinite, and sand), and then pyrolyzed at 600 °C for 60 min. Characterizations including proximate analysis, ultimate analysis, surface area and porosity, morphology and surface chemistry confirmed that minerals were present on the surface of biochar, and MMT/kaolinite-biochar composites showed a strengthening in the chars' aromatic structures, as well as increases in oxygencontaining surface functional groups. Methylene blue adsorption isotherms indicated that the MMT/kaolinite-biochars had higher adsorption capacities than pure biomass or biomass-sand biochars (110 mgMB/gchar and 24 mgMB/gchar for MMT-cellulose char and cellulose char, respectively). A multilinear model relating adsorption capacity and adsorbent properties was developed to measure the relative contribution of biochar properties to adsorption behavior. The model indicates that pore volume and hydrogen

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Section: Comparison With Other Reported Adsorbentsmentioning

confidence: 99%

Characterization and adsorption applications of composite biochars of clay minerals and biomass

Gao

Goldfarb

2021

Environ Sci Pollut Res

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“…T-test results (Table 3) From this multiparameter linear regression model, we see that pore volume and oxygen and hydrogen content were the controlling properties of mineral-biochar composites to adsorb MB. To increase the adsorption capacity of MB, it may be necessary to apply pore reaming and surface modification coupled methods (such as physical activation-steaming exploration (Miao et al, 2019), chemical activation-KOH activation (Qu et al, 2021)) to produce a composite with higher pore volume and increase the oxygen and hydrogen content. Further research will explore the relationship between adsorbent properties and coexistence of multiple pollutants with different nature, then developing and designing the upgraded biochar to removal pollutants with maximum capacity.…”

Section: Comparison With Other Reported Adsorbentsmentioning

confidence: 99%

Characterization and Adsorption Applications of Composite Biochars of Clay Minerals and Biomass

Gao

Goldfarb

2021

Preprint

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Composite mineral-biochars of a homogeneous biomass (cellulose) and heterogeneous biomass (oak leaves) were fabricated with either 5wt% or 10wt% minerals (montmorillonite (MMT), kaolinite, and sand), and then pyrolyzed at 600 °C for 60 min. Characterizations including proximate analysis, ultimate analysis, surface area and porosity, morphology and surface chemistry confirmed that minerals were present on the surface of biochar, and MMT/kaolinite-biochar composites showed a strengthening in the chars’ aromatic structures, as well as increases in oxygen-containing surface functional groups. Methylene blue adsorption isotherms indicated that the MMT/kaolinite-biochars had higher adsorption capacities than pure biomass or biomass-sand biochars (110 mgMB/gchar and 24 mgMB/gchar for MMT-cellulose char and cellulose char, respectively). A multilinear model relating adsorption capacity and adsorbent properties was developed to measure the relative contribution of biochar properties to adsorption behavior. The model indicates that pore volume and hydrogen bonding were the dominant properties in controlling the adsorption of methylene blue onto the biochars. Findings from this work indicate that composite biochars prepared from biomass and inexpensive clay minerals are a promising adsorbent for remediating organic contaminants from water.

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“…In recent years, biochar has shown interesting properties mitigating the accumulation of hexavalent chromium (Xiao et al, 2021). Indeed, due to the high carbon content, biochar (particularly activated biochar) can stimulate the release of dissolved organic carbon, which can act as an electron source for the reduction of Cr(VI) (Qu et al, 2021). Biochar can be produced from many different feedstocks, and the characteristics of these can strongly influence biochar suitability for decreasing Cr(VI) accumulation (Pan et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Activated biochars derived from wood biomass liquefaction residues for effective removal of hazardous hexavalent chromium from aquatic environments

et al. 2021

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Residues obtained after wood biomass liquefaction were used as precursors for the synthesis of two activated biochars. The source of biomass liquefaction constituted of industrial wood processing by‐products, including bark and wood sawdust. The liquefied residues were analyzed in terms of chemical components and structure. Carbonization under nitrogen atmosphere followed by physical CO2 activation allowed to obtain microporous activated carbons with specific surface areas of 741 and 522 m2 g−1, and micropore volumes of 0.38 and 0.27 cm3 g−1, respectively. The obtained activated carbons were used to remove toxic hexavalent chromium from the aquatic environment. The observed sorption capacities were 80.6 mg g−1 versus 36.7 mg g−1 for wood bark‐derived and wood sawdust‐derived carbon, respectively, indicating a key role of the wood residue source in the effectiveness of Cr(VI) removal by resulting carbons. Despite the dominant microporous structure, the adsorption kinetics was surprisingly fast, especially for the bark‐derived carbon, since the adsorption equilibrium was reached within 2 h. The sorption mechanism of chromium was based on the carbon surface‐mediated reduction of toxic hexavalent form to its non‐toxic trivalent form, as confirmed by the X‐ray photoelectron analysis. Therefore, the residues from wood liquefaction can be easily converted into porous activated biocarbons capable of adsorbing significant amounts of hazardous Cr(VI) while reducing them to non‐toxic Cr(III).

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KOH-activated porous biochar with high specific surface area for adsorptive removal of chromium (VI) and naphthalene from water: Affecting factors, mechanisms and reusability exploration

Cited by 292 publications

References 44 publications

Characterization and adsorption applications of composite biochars of clay minerals and biomass

Characterization and adsorption applications of composite biochars of clay minerals and biomass

Characterization and Adsorption Applications of Composite Biochars of Clay Minerals and Biomass

Activated biochars derived from wood biomass liquefaction residues for effective removal of hazardous hexavalent chromium from aquatic environments

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