Removal of chromium (VI) from water using nanoscale zerovalent iron particles supported on herb-residue biochar

Shang, Jingge; Zong, Mingzhu; Yu, Ying; Kong, Xiangrui; Du, Qingyang; Liao, Qianjiahua

doi:10.1016/j.jenvman.2017.03.085

Cited by 195 publications

(55 citation statements)

References 45 publications

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“…The results (Figure 3b) showed that the removal rate decreased from 99.84% to 53.06%, with an increase in the initial Cr(VI) concentration, and saturation removal was 66 mg/g. Compared with reports in the past three years, this study found that the treatment capacity of this material for chromium was better than that of most studies, only worse than that of two biochar supported nZVI [33,48] and one chitosan supported nZVI [49] (see ESI, Table S2). Subsequently, the removal rates of Cr(VI) at different times for different materials (nZVI-MAC, MAC, ZVI) also were investigated.…”

Section: Performance Of Nzvi-mac For Cr(vi) Removalcontrasting

confidence: 84%

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Preparation of Activated Carbon Supported Bead String Structure Nano Zero Valent Iron in a Polyethylene Glycol-Aqueous Solution and Its Efficient Treatment of Cr(VI) Wastewater

et al. 2019

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Nanometer zero-valent iron (nZVI) has been widely used in the treatment of heavy metals such as hexavalent chromium (Cr(VI)). A novel composite of bead string-structured nZVI on modified activated carbon (nZVI-MAC) is prepared here, using polyethylene glycol as the stable dispersant rather than traditional ethanol during the loading process. The microstructure characterization shows that nZVI particles are loaded on MAC with a bead string structure in large quantity and stably due to the addition of hydroxyl functional groups on the surface by polyethylene glycol. Experiments on the treatment of Cr(VI) in wastewater show that the reaction process requires only 20 min to achieve equilibrium. The removal rate of Cr(VI) with a low concentration (80-100 mg/L) is over 99% and the maximum saturation removal capacity is up to 66 mg/g. The system converts Cr(VI) to trivalent chromium (Cr(III)) through an oxidation-reduction effect and forms an insoluble material with iron ions by coprecipitation, which is then adsorbed on the surface of the nZVI-MAC. The process conforms to the quasi-second order adsorption kinetics equation (mainly chemical adsorption process).

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Section: Performance Of Nzvi-mac For Cr(vi) Removalcontrasting

confidence: 84%

“…The following are available online at http://www.mdpi.com/1420-3049/25/1/47/s1, Figures S1-S6, Tables S1 and S2 [11,26,33,48,49,[55][56][57][58][59][60][61][62].…”

Section: Supplementary Materialsmentioning

confidence: 99%

Preparation of Activated Carbon Supported Bead String Structure Nano Zero Valent Iron in a Polyethylene Glycol-Aqueous Solution and Its Efficient Treatment of Cr(VI) Wastewater

et al. 2019

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“…The two peaks at 578.0 and 576.6 eV are characteristic peaks of Cr(VI) and Cr (III), respectively. This finding indicates that Cr 2 O 3 and Cr(OH) 3 precipitated on the surface of nZVI-ASBC [23]. As shown in Figure 4, the curve has two distinct areas, namely, a high-energy zone (Fe 2p 1/2 ) and a low-energy zone (Fe 2p 3/2 ).…”

Section: Xrd and Xps Of Cr(vi)-fe (0) Reactionsmentioning

confidence: 76%

Almond Shell-Derived, Biochar-Supported, Nano-Zero-Valent Iron Composite for Aqueous Hexavalent Chromium Removal: Performance and Mechanisms

Shu

Cui

et al. 2020

Nanomaterials

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Nano-zero-valent iron biochar derived from almond shell (nZVI-ASBC) was used for hexavalent chromium (CR) removal. Experiments showed that pH was the main factor (p < 0.01) that affected the experimental results. At a dosage of 10 mg·L−1 and pH of 2–6, in the first 60 min, nZVI-ASBC exhibited a removal efficiency of 99.8%, which was approximately 20% higher than the removal yield at pH 7–11. Fourier transform infrared spectroscopy results indicated N-H was the main functional group that influenced the chemisorption process. The pseudo second-order dynamics and Langmuir isotherm models proved to be the most suitable. Thermodynamic studies showed that the reaction was exothermic and spontaneous at low temperatures (T < 317 K). Various interaction mechanisms, including adsorption and reduction, were adopted for the removal of Cr(VI) using the nZVI-ASBC composite. The findings showed that the BC-modified nZVI prepared with almond shell exerts a good effect and could be used for the removal of Cr(VI).

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“…7 The plots of the pseudo-first-order (a), pseudo-second-order (b), Elovich (c) and intraparticulate diffusion (d) models for the adsorption of Cr(VI) on the nZVI/BC. 39,41,42 To further demonstrate the composition of the product, XPS analysis was performed. Compared with the freshly prepared nZVI/BC, aer treatment with the Cr(VI) solution two new peaks appeared in curve i of Fig.…”

Section: Adsorption Mechanisms Of Cr(vi)mentioning

confidence: 99%

High dispersions of nano zero valent iron supported on biochar by one-step carbothermal synthesis and its application in chromate removal

You

Yao

et al. 2019

RSC Adv.

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Removal of chromium (VI) from water using nanoscale zerovalent iron particles supported on herb-residue biochar

Cited by 195 publications

References 45 publications

Preparation of Activated Carbon Supported Bead String Structure Nano Zero Valent Iron in a Polyethylene Glycol-Aqueous Solution and Its Efficient Treatment of Cr(VI) Wastewater

Preparation of Activated Carbon Supported Bead String Structure Nano Zero Valent Iron in a Polyethylene Glycol-Aqueous Solution and Its Efficient Treatment of Cr(VI) Wastewater

Almond Shell-Derived, Biochar-Supported, Nano-Zero-Valent Iron Composite for Aqueous Hexavalent Chromium Removal: Performance and Mechanisms

High dispersions of nano zero valent iron supported on biochar by one-step carbothermal synthesis and its application in chromate removal

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