Remediation of hexavalent chromium contaminated soil by biochar-supported zero-valent iron nanoparticles

Su, Huijie; Fang, Zhen; Tsang, Eric Pokeung; Zheng, Liuchun; Wen, Chuang; Fang, Jianzhang; Zhao, Dongye

doi:10.1016/j.jhazmat.2016.07.039

Cited by 258 publications

(79 citation statements)

References 35 publications

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“…In the pyrolysis process, properly selected conditions allow to obtain low-cost sorbents of high porosity and suitable surface area [8, 9]. The addition of biochar to the soil increases its fertility because of its abundant organic matter [10]. Biochar is also used as a sorbent for the removal of heavy metal ions: Cu(II), Cd(II) [11, 12], Cr(VI), Pb(II) [13], Ni(II) [14] and others.…”

Section: Introductionmentioning

confidence: 99%

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Investigations of Heavy Metal Ion Sorption Using Nanocomposites of Iron-Modified Biochar

et al. 2017

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Magnetic biochar nanocomposites were obtained by modification of biochar by zero-valent iron. The article provides information on the impact of contact time, initial Cd(II), Co(II), Zn(II), and Pb(II) ion concentrations, dose of the sorbents, solution pH and temperature on the adsorption capacity. On the basis of experiments, it was found that the optimum parameters for the sorption process are phase contact time 360 min (after this time, the equilibrium of all concentrations is reached), the dose of sorbent equal to 5 g/dm3, pH 5 and the temperature 295 K. The values of parameters calculated from the kinetic models and isotherms present the best match to the pseudo second order and Langmuir isotherm models. The calculated thermodynamic parameters ∆H 0, ∆S 0 and ∆G 0 indicate that the sorption of heavy metal ions is an exothermic and spontaneous process as well as favoured at lower temperatures, suggesting the physical character of sorption. The solution of nitric acid(V) at the concentration 0.1 mol/dm3 was the best acidic desorbing agent used for regeneration of metal-loaded magnetic sorbents. The physicochemical properties of synthesized composites were characterized by FTIR, SEM, XRD, XPS and TG analyses. The point characteristics of the double layer for biochar pHPZC and pHIEP were designated.

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Section: Introductionmentioning

confidence: 99%

“…Zero-valent iron-coated biochar is characterized by high reactivity and high affinity for the impurities in aqueous solutions of the organic compounds: pentachlorophenol [22] and trichloroethylene [23] as well as the heavy metal ions As(V) [24], Cr(VI) [10] and Pb(II) [25]. …”

Section: Introductionmentioning

confidence: 99%

Investigations of Heavy Metal Ion Sorption Using Nanocomposites of Iron-Modified Biochar

et al. 2017

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“…Several mineral-based materials have been studied for their ability to remediate metal-contaminated soil and sediment. These include zero-valent iron, hematite, ferrihydrite, apatite and clays (Qian, Chen et al 2009, Su, Fang et al 2016, Wang, Zhu et al 2017. The natural calcium-rich clay minerals sepiolite and attapulgite can effectively reduce both the mobile metal fraction and the bioavailability to benthic organisms in Pb and Cd polluted sediments (Yin and Zhu 2016).…”

Section: Active Materials (Sorbents)mentioning

confidence: 99%

Contaminated Sediments

Olsen¹,

Petersen²,

Lehoux³

et al. 2019

TemaNord

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“…However, its efficiency is reduced by a strong propensity for aggregation [27]. Consequently, scholars have developed various supports for nZVI, such as layered double hydroxide (LDH)-intercalated cellulose nanocomposite [28], biochar-supported nZVI nanoparticles [29], clay-supported nZVI [30], and bentonite-nZVI (B-nZVI) [31,32]. All these supports not only facilitate the dispersion of nZVI and stabilize it, but also allow easy adsorbent collection after use.…”

Section: Introductionmentioning

confidence: 99%

Effect of Kaolin particle size on the removal of Pb(II) from aqueous solutions by Kaolin-supported nanoscale zero-valent iron

Chen

et al. 2020

Mater. Res. Express

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The removal of Pb(II) from aqueous solutions was investigated using kaolin with two different particle sizes (2.3 and 45 μm) with and without nanoscale zero-valent iron (nZVI, at a Fe content close to 30%). The experimental results show that 2.3 μm kaolin loaded with nZVI (K-nZVI) had the best Pb(II) removal performance under various test conditions. After 24 h, it removed 99.5% of Pb(II) ions in the solution, followed by 45 μm K-nZVI, 2.3 μm kaolin, and 45 μm kaolin (89.01%, 68.8%, and 65.8%, respectively). The removal rates by all four kaolin samples increased with increasing pH in the range of 2-6, and with increasing temperature between 30°C-60°C. The results show that using finer carrier particles improves the performance of K-nZVI for removing Pb(II) in aqueous solutions.

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Remediation of hexavalent chromium contaminated soil by biochar-supported zero-valent iron nanoparticles

Cited by 258 publications

References 35 publications

Investigations of Heavy Metal Ion Sorption Using Nanocomposites of Iron-Modified Biochar

Investigations of Heavy Metal Ion Sorption Using Nanocomposites of Iron-Modified Biochar

Contaminated Sediments

Effect of Kaolin particle size on the removal of Pb(II) from aqueous solutions by Kaolin-supported nanoscale zero-valent iron

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