Sodium citrate and biochar synergistic improvement of nanoscale zero-valent iron composite for the removal of chromium (Ⅵ) in aqueous solutions

Zhou, Huiyang; Ye, Mengyao; Zhao, Yongkang; Baig, Shams Ali; Huang, Ning; Ma, Mengyan

doi:10.1016/j.jes.2021.05.044

Cited by 50 publications

(21 citation statements)

References 46 publications

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“…XPS and DFT simulations confirmed that the strong H-bonds between HCrO 4 and carboxyl/ hydroxyl as well as surface complexation elevated Cr(VI) eradication by O-rich biochar, while for N-rich biochar, coexisting anions depressed Cr(VI) elimination in the order of Cl -> NO 3 -> SO 4 2due to the weaker H-bond interaction between HCrO 4 and protonated amino groups. It is possible to efficiently eliminate Cr(VI) using different biochar-based materials through combined adsorption, reduction, and coprecipitation processes (Ma et al 2022;Ri et al 2022;Wen et al 2022;Zhou et al 2022).…”

Section: Heavy Metal Ionsmentioning

confidence: 99%

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

Qiu

Liu

Ling

et al. 2022

Biochar

377

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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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Section: Heavy Metal Ionsmentioning

confidence: 99%

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

Qiu

Liu

Ling

et al. 2022

Biochar

377

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“…However, these peaks were neglectable in the samples of IMC200-1 and IMC400-1, indicating the pyrolysis temperature acted as essential roles for the formation of Fe 0 species, and lower temperature (< 600 °C) could not form IMC contained Fe 0 . The formation of Fe 0 from biomass and red mud could be explained by the generated hydrogen and CO from biomass could reduce Fe 2+ and Fe 3+ to Fe 0 , and the observed Fe 3 O 4 with the 2θ of 29.8° and 33.4° (PDF#00-034-0417) also proved the transforming processes 28 , 29 . Meanwhile, the existence of Fe 2 Al 3 Si 3 , Fe 2 SiO 4 , and K 2 FeO 4 , could be attributed to the inherent impurities in the red mud and straw biomass.…”

Section: Resultsmentioning

confidence: 86%

“…Interestingly, according to the EDS results are exhibited in Fig. 2 c–e, there were several minerals in IMC, such as Si, Ca, Al, and so on, these species inherited from red mud, and might could react with contaminants during reaction 28 . Hence, according to the SEM observation, the equally distributed Fe 0 species further proved the successful synthesis of IMC materials.…”

Section: Resultsmentioning

confidence: 96%

Hexavalent chromium elimination from wastewater by integrated micro-electrolysis composites synthesized from red mud and rice straw via a facile one-pot method

Wang

Cui

Chen

et al. 2022

Sci Rep

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The widely spread chromium (Cr) contamination is rising environmental concerns, while the reutilization of agro-industrial by-products are also urgently demanded due to their potential risks. In this study, we prepared the integrated micro-electrolysis composites (IMC) through a facile one-pot method with red mud and rice straw. The effects of components relatively mass ratios as well as pyrolysis temperature were analyzed. The XRD, XPS, SEM, FTIR, and various techniques proved the IMC was successfully synthesized, which was also used to analyze the reaction mechanisms. In this study, the dosage of IMC, pH, adsorption time, and temperature of adsorption processes were explored, in the adsorption experiment of Cr(VI), dosage of IMC was 2 g/L (pH 6, 25 °C, and 200 rpm) for isothermal, while the concentration and contact time were also varied. According to the batch experiments, IMC exhibited acceptable removal capacity (190.6 mg/g) on Cr(VI) and the efficiency reached 97.74%. The removal mechanisms of adsorbed Cr(VI) were mainly elaborated as chemical reduction, complexation, co-precipitation, and physical adherence. All these results shed light on the facile preparation and agro-industrial by-products recycled as engineering materials for the heavy metals decontamination in wastewater.

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“…After introduction of Fe, Cr(VI) was reduced to Cr(III) via oxidation of Fe(0) on the surface of the NZVI/BC to Fe(II) (Eqns 2–4), and then Cr(VI) could also be reduced to Cr(III) by Fe(II) produced during the reaction (Eqns 5–7). 27,28 Furthermore, the formation of Cr(III)–Fe(III) co‐precipitates might be occur (Eqns 8 and 9): 29,30

3 {Fe}^{0} + 2 HCr {O_{4}}^{-} + 14 {normalH}^{+} \to 3 {Fe}^{2 +} + 2 {Cr}^{3 +} + 8 {normalH}_{2} O

3 {Fe}^{0} + {Cr}_{2} {O_{7}}^{2 -} + 14 {normalH}^{+} \to 3 {Fe}^{2 +} + 2 {Cr}^{3 +} + 7 {normalH}_{2} O

3 {Fe}^{0} + 2 Cr {O_{4}}^{2 -} + 16 {normalH}^{+} \to 3 {Fe}^{2 +} + 2 {Cr}^{3 +} 8 {normalH}_{2} O

3 {Fe}^{2 +} HCr {O_{4}}^{-} + 7 {normalH}^{+} \to 3 {Fe}^{3 +} + {Cr}^{3 +} + 4 {normalH}_{2} O

6 {Fe}^{2 ...}

…”

Section: Resultsmentioning

confidence: 99%

“…After introduction of Fe, Cr (VI) was reduced to Cr(III) via oxidation of Fe(0) on the surface of the NZVI/BC to Fe(II) (Eqns 2-4), and then Cr(VI) could also be reduced to Cr(III) by Fe(II) produced during the reaction (Eqns 5-7). 27,28 Furthermore, the formation of Cr(III)-Fe(III) co-precipitates might be occur (Eqns 8 and 9): 29,30 3Fe 0 +2HCrO 4…”

Section: Cr(vi) Removal Behaviors Comparison Of Cr(vi) Removal By Dif...mentioning

confidence: 99%

Removal of Cr(VI) by a simply prepared biochar‐supported nanoscale zero‐valent iron

Cao

Chen

Wan

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND Cr(VI) is highly migratory and toxic, and long‐term exposure to Cr(VI) is likely to cause cancer, teratogenesis and mutagenicity. Therefore, the removal of Cr(VI) in polluted wastewater is the key to ensure the safety of water quality. In this study, a composite material consisting of nanoscale zero‐valent iron (NZVI) particles supported on biochar derived from starch (NZVI/BC) was prepared via carbonizing the mixture of starch and ferric nitrate in inert gas and used for removal of Cr(VI) from solution. The effects of NZVI/BC dosage, initial pH and reaction temperature on the removal efficiency of Cr(VI) were investigated. RESULTS The results revealed that H2 and CH4 originating from the decomposition of starch acted as reducing agents for in situ generation of NZVI from Fe precursors. The removal efficiency of Cr(VI) was strongly dependent on dosage, pH and reaction temperature. Higher dosage, lower pH value and higher temperature led to an increase in Cr(VI) removal efficiency. Pseudo‐second‐order kinetics was suitable to describe the process of Cr(VI) removal by NZVI/BC. CONCLUSIONS NZVI/BC could be a potential and effective material for removal of Cr(VI) from solution. © 2022 Society of Chemical Industry (SCI).

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Sodium citrate and biochar synergistic improvement of nanoscale zero-valent iron composite for the removal of chromium (Ⅵ) in aqueous solutions

Cited by 50 publications

References 46 publications

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

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

Hexavalent chromium elimination from wastewater by integrated micro-electrolysis composites synthesized from red mud and rice straw via a facile one-pot method

Removal of Cr(VI) by a simply prepared biochar‐supported nanoscale zero‐valent iron

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