A novel biochar supported CMC stabilized nano zero-valent iron composite for hexavalent chromium removal from water

Zhang, Shuai; Lyu, Honghong; Tang, Jingchun; Song, Benru; Zhen, Mengmeng; Liu, Xiaomei

doi:10.1016/j.chemosphere.2018.11.040

Cited by 200 publications

(54 citation statements)

References 41 publications

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“…The different biochars displayed increasing amounts of adsorption as the concentration of Cr(VI) increased. At low concentrations, the adsorption amount of Cr(VI) increased almost linearly, and at high concentrations, the adsorption amount increased slowly and gradually became stable [19], achieving adsorption equilibrium. The appearance of this law can be explained by the fact that when the Cr(VI) solution is at a low concentration, the biochar can provide a large number of adsorption sites and acid-base functional groups (such as hydroxyl groups, phenolic hydroxyl groups, and aromatic hydrocarbons), thereby increasing the concentration of the adsorption solution and the adsorption capacity of biochar on Cr(VI).…”

Section: Adsorption Isotherm Studymentioning

confidence: 99%

“…The adsorption capacity could reach 112.50 mg/g, thus proving that electrostatic attraction, reduction, and surface complexation are the main removal mechanisms. Moreover, this work showed the potential of biochar-CMC-nZVI as an efficient, green, and economical adsorbent for Cr(VI) [19]. A novel N-doped magnetic biochar was synthesized by the pyrolysis of an agar biomass loaded with ferric chloride.…”

Section: Introductionmentioning

confidence: 96%

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High-Efficiency Removal of Cr(VI) from Wastewater by Mg-Loaded Biochars: Adsorption Process and Removal Mechanism

Deng

Jiang

et al. 2020

Materials

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Biochars were produced with magnesium chloride as an additive for the sorption of hexavalent chromium dissolved in water using five types of straw (from taro, corn, cassava, Chinese fir, and banana) and one type of shell (Camellia oleifera) as the raw materials. The removal of hexavalent chromium by the six biochars mainly occurred within 60 min and then gradually stabilized. The kinetics of the adsorption process were second order, the Langmuir model was followed, and the adsorption of Cr(VI) by the six biochars was characterized by Langmuir monolayer chemisorption on a heterogeneous surface. Banana straw biochar (BSB) had the best performance, which perhaps benefitted from its special structure and best adsorption effect on Cr(VI), and the theoretical adsorption capacity was calculated as 125.00 mg/g. For the mechanism analysis, Mg-loaded biochars were characterized before and after adsorption by Fourier transform infrared spectroscopy (FTIR), X-ray diffractometry (XRD), and scanning electron microscopy/energy dispersive spectroscopy (SEM-EDS). The adsorption mechanism differed from the adsorption process of conventional magnetic biochar, and biochar interactions with Cr(VI) were controlled mainly by electrostatic attraction, complexation, and functional group bonding. In summary, the six Mg-loaded biochars exhibit great potential advantages in removing Cr(VI) from wastewater and have promising potential for practical use, especially BSB, which shows super-high adsorption performance.

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Section: Adsorption Isotherm Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

High-Efficiency Removal of Cr(VI) from Wastewater by Mg-Loaded Biochars: Adsorption Process and Removal Mechanism

Deng

Jiang

et al. 2020

Materials

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“…Additionally, a large number of spherical nZVI particles remain that did not assemble into chains, which is not clearly illustrated on the surface of the material. Further HRTEM observations indicated that nZVI had a thin layer of iron oxide on its surface [37] (the blue arrow in Figure 1e), indicating its core-shell structure.…”

Section: Characterization Of Nzvi-macmentioning

confidence: 98%

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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“…Biochar-supported nano-scale zerovalent iron (biochar-CMC-nZVI) stabilized by carboxymethyl cellulose (CMC) was devised and utilized for removing Cr(VI) from an aqueous solution. 180 The outcome showed that 100 mg L À1 Cr(VI) could be displaced entirely by biochar-CMC-nZVI within 18 hours, at a dosage of 1.25 g L À1 , and an initial pH value of 5.6.Cr(VI). Using biochar-CMC-nZVI to remove contamination is favored when lower pH is present.…”

Section: Biochar-incorporating Metalsmentioning

confidence: 99%

Perspectives regarding metal/mineral-incorporating materials for water purification: with special focus on Cr(vi) removal

et al. 2020

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A novel biochar supported CMC stabilized nano zero-valent iron composite for hexavalent chromium removal from water

Cited by 200 publications

References 41 publications

High-Efficiency Removal of Cr(VI) from Wastewater by Mg-Loaded Biochars: Adsorption Process and Removal Mechanism

High-Efficiency Removal of Cr(VI) from Wastewater by Mg-Loaded Biochars: Adsorption Process and Removal Mechanism

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

Perspectives regarding metal/mineral-incorporating materials for water purification: with special focus on Cr(vi) removal

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