Simultaneous removal of nitrate and diethyl phthalate using a novel sponge–based biocarrier combined modified walnut shell biochar with Fe3O4 in the immobilized bioreactor

Xu, Liang; Su, Junfeng; Huang, Tingling; Li, Guoqing; Ali, Amjad; Shi, Jun

doi:10.1016/j.jhazmat.2021.125578

Cited by 61 publications

(4 citation statements)

References 58 publications

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“…nZVI-biochar particles were prepared using walnut shell biochar as a carrier. As described in the previous study (Xu et al 2021), nZVI-biochar could be synthesized by liquid-phase reduction method. 24.88 g FeSO 4 •7H 2 O and 5 g biochar were dissolved in 200 ml ethanol-water (ethanol: water = 1:3, v/v) to prepare nZVI-biochar and stirred continuously for 30 min.…”

Section: Biochar and Nzvi-biochar Preparation Used In This Experimentsmentioning

confidence: 99%

“…Agricultural wastes, crustacean shells and animal feces are common biochar precursor materials (Li et al 2022;Sun et al 2022). Up to 1.5 million ton of walnut shell per year by 2020 was produced in China (Zhang et al 2015), with superior hydrophilicity, high specific surface area (Xu et al 2021) and wear resistance (Yu et al 2016), which was considered as an promising raw material of biochar. Combination of biochar and nZVI could effectively protect nZVI from agglomeration and rapid oxidation and increase dispersion on biochar, thus enhance the removal of pollutants (Wang et al 2019).…”

Section: Introductionmentioning

confidence: 99%

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Enhanced removal of estrogens from simulated wastewater by biochar supported nanoscale zero-valent iron: performance and mechanism

Han,

Xu,

Wang

et al. 2023

Biochar

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The intensification of estrogen non-point source pollution has drawn global attention due to their contribution to ecological environment problems worldwide, and it is critical to develop effective, economic and eco-friendly methods for reducing estrogens pollution. To address the agglomeration and oxidation of nano zero-valent iron (nZVI), biochar-nanoscale zero-valent iron composite (nZVI-biochar) could be a feasible choice for estrogens removal. This study summarized biochar and nZVI-biochar preparation, characterization, and unusual applications for estrone (E1), 17β-estradiol (E2), and estriol (E3) removal. The properties of biochar and nZVI-biochar in characterization, effects of influencing factors on the removal efficiency, adsorption kinetics, isotherm and thermodynamics were investigated. The experiment results showed that nZVI-biochar exhibited the superior removal performance for estrogens pollutants compared to biochar. Based on the quasi-second-order model, estrogens adsorption kinetics were observed, which supported the mechanism that chemical and physical adsorption existed simultaneously on estrogens removal. The adsorption isotherm of estrogens could be well presented by the Freundlich model and thermodynamics studies explained that nZVI-biochar could spontaneously remove estrogens pollutants and the main mechanisms involved π-π interaction, hydrophobic interaction, hydrogen bonding and degradation through ring rupture. The products analyzed by GC–MS showed that estrogens degradation was primarily attributed to the benzene ring broken, and Fe3+ promoted the production of free radicals, which further proved that nZVI-biochar had the excellent adsorption performances. Generally, nZVI-biochar could be employed as a potential material for removing estrogens from wastewater. Graphical Abstract

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Section: Biochar and Nzvi-biochar Preparation Used In This Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced removal of estrogens from simulated wastewater by biochar supported nanoscale zero-valent iron: performance and mechanism

Han,

Xu,

Wang

et al. 2023

Biochar

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“…Sponge iron corrosion produces H 2 for hydrogen-autotrophic denitrifying bacteria to provide electron donors, and the generated Fe 2+ and Fe 3+ ions act as electron donors and shuttle between microorganisms [29]. The electron transfer process is as follows [30] Therefore, the addition of Fe-containing substances to carriers can improve denitrification [31]. Li et al [32] loaded iron powder onto corncobs, and the maximum nitrate removal efficiency was 99.30%, reaching 81.73% without a carbon source.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Self-Releasing Carbon Biofilm Carrier Based on Corncob and Denitrification Properties

Wang,

Liu,

et al. 2023

Fermentation

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Wastewater with a low carbon/nitrogen (C/N) ratio is widespread and difficult to treat. The addition of an external carbon source is an effective method for treating such wastewater. Therefore, we aimed to prepare a self-releasing carbon biofilm carrier using agricultural waste (corncobs), polyvinyl alcohol, and sponge iron in various ratios to provide a carbon source that would facilitate denitrification, providing an optimal environment for microorganisms. We found that the carbon release of the MAC biofilm carrier that accumulated over 60 d was 116.139 mg of chemical oxygen demand (COD)·g−1, whereas the accumulated total nitrogen release was approximately 0 mg·(g·d)−1. The NO3−-N removal rate after 24 h reached 98.1%, whereas the theoretical use rate of the carbon source (in terms of COD) was stable at 90.34%. In addition, the sum of the abundances of the denitrifying and cellulose-degrading bacteria was 49.89%. Furthermore, biofilm carriers are used as functional carriers that contribute to cellulose degradation, a process in which sponge iron produces Fe2+ to provide electron donors and shuttles for denitrifying bacteria and forms the iron cycle, thereby inducing an increase in microbial abundance; this increase then facilitates the microbial degradation of cellulose and synergistic denitrification through interspecific bacterial cooperation. This study provides a new and effective method for enhancing the denitrification of wastewater with low C/N ratios.

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“…However, Fe-based catalyst is a better choice because of its non-toxic and large storage capacity. Non-homogeneous Febased catalysts such as nanometer zero-valent iron (NZVI) (Chen et al 2020), magnetic Fe3O4 (Xu et al 2021) and spinel ferrite (CuFe2O4) have been used to activate PMS and have good removal effect. Therefore, it is still necessary to explore new Fe-based PMS activators.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Acid Red B by Manganese doped iron oxychloride and Permonosulfate: Performance and Inhomogeneous Activation Mechanism

Chen

Zhao

Dong

et al. 2021

Preprint

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manganese doped iron oxychloride (Mn-FeOCl) was synthesized by partial pyrolysis method. The Mn-FeOCl was used as heterogeneous catalyst to activate permonosulfate (PMS) for the degradation of azo dye acid red B(ARB) for the first time. The Mn-FeOCl was characterized by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction spectroscopy (XRD). The effects of Mn-FeOCl dosage, PMS concentration, initial pH value, Cl ion concentration and humic acid (HA) dosage on the degradation of ARB by Mn-FeOCl/PMS were investigated. Results showed that the ARB was degraded effectively by Mn-FeOCl/PMS. The mineralization rate of ARB reached 42.5%. As the Mn-FeOCl dosage was 0.1g/L, PMS concentration was 1mmol/L, and ARB concentration was 0.05mmol/L, the degradation rate of ARB reached 99.4% in 30 minutes. With the increase of PMS dosage, Mn-FeOCl dosage, Cl− ion concentration and initial pH value, the decolorization effect of ARB increased. The reaction mechanism was analyzed by free radical quenching experiment and XPS. The main active species were determined as ·OH and SO4·− which generated by PMS activation. The SO4·−−was the main active species.

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Simultaneous removal of nitrate and diethyl phthalate using a novel sponge–based biocarrier combined modified walnut shell biochar with Fe3O4 in the immobilized bioreactor

Cited by 61 publications

References 58 publications

Enhanced removal of estrogens from simulated wastewater by biochar supported nanoscale zero-valent iron: performance and mechanism

Enhanced removal of estrogens from simulated wastewater by biochar supported nanoscale zero-valent iron: performance and mechanism

Preparation of Self-Releasing Carbon Biofilm Carrier Based on Corncob and Denitrification Properties

Degradation of Acid Red B by Manganese doped iron oxychloride and Permonosulfate: Performance and Inhomogeneous Activation Mechanism

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