The degradation of decabromodiphenyl ether in the e-waste site by biochar supported nanoscale zero-valent iron /persulfate

Li, Haihong; Zhu, Fang; He, Siying

doi:10.1016/j.ecoenv.2019.109540

Cited by 63 publications

(14 citation statements)

References 42 publications

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“…The weak Fe 2 O 3 peaks indicated that a small amount of Fe 2 O 3 was attached to the surface of nZVI@Bent. The XRD pattern of biochar supported nanoscale zero-valve iron prepared by Li et al 35 showed obvious peaks of Fe 2 O 3 and FeOOH, nZVI supported with biochar will not effectively reduce the oxidation. However, there were no obvious peaks of Fe 2 O 3 and FeOOH in Fig.…”

Section: Removal Of Cr(iii) By Nzvi@bentmentioning

confidence: 98%

Study on influencing factors and mechanism of removal of Cr(VI) from soil suspended liquid by bentonite-supported nanoscale zero-valent iron

Liu

Gao

Cheng

et al. 2020

Sci Rep

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In order to clarify the mechanism and effect of bentonite-supported nanoscale zero-valent iron (nZVI@Bent) on Cr(VI) removal in soil suspended liquid, nZVI@Bent was prepared by liquid-phase reduction method in this research. A number of factors, including the mass ratio of Fe 2+ to bentonite during preparation of nZVI@Bent, nZVI@Bent dosage, soil suspended liquid pH value and reaction temperature were assessed to determine their impact on the reduction of Cr(VI) in soil suspended liquid. The nZVI@Bent was characterized by scanning electron microscope (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) to analyze the mechanism of removal of Cr(VI) from the soil. The results showed that the temperature of soil suspended liquid had a significant effect on the removal efficiency. Calculated by the Arrhenius formula, nZVI@Bent removes Cr(VI) from the soil suspended liquid as an endothermic reaction with a reaction activation energy of 47.02 kJ/mol, showed that the reaction occurred easily. The removal of mechanism Cr(VI) from the soil by nZVI@Bent included adsorption and reduction, moreover, the reduction process can be divided into direct reduction and indirect reduction. According to XPS spectrogram analysis, the content of Cr(III) in the reaction product was 2.1 times of Cr(VI), indicated that the reduction effect was greater than the adsorption effect in the process of Cr(VI) removal. The experiment proved that nZVI@Bent can effectively remove Cr(VI) from soil suspension, and can provide technical support for repairing Cr(VI)-polluted paddy fields. Chromium (Cr) is a heavy metal element that exists on the earth, mostly in the two valence states of Cr(III) and Cr(VI). Under certain conditions, Cr(VI) will be reduced to Cr(III) by reducing substances in the soil. Different environmental pollution effects of chromium in different valence states. Cr(VI) can be inhaled with dust to cause respiratory diseases. Oral administration can also cause digestive tract corrosion. After long-term exposure to the high concentration of Cr(VI), gene expression may be changed by destroying DNA, protein and lipid, which can cause cancer in severe cases 1,2. However, the toxicity of Cr(III) is much lower than that of Cr(VI), moreover, Cr(III) was an essential trace element in biological activities, and low concentration of Cr(III) was beneficial to organisms 3-6. Compared with Cr(VI), Cr(III) is more stable in the environment and difficult to migrate. Many industries containing chromium pollution such as metallurgy, tannery and electroplating and so on had sprung up in recent years. The discharge of wastewater in these industries lead to increasing the concentration of chromium in the cultivated soil environment, meanwhile, the land near factories was also polluted by a large accumulation of chromium slag and chromium dust 7-9. It is almost impossible to remove Cr from the soil, so it is the

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Section: Removal Of Cr(iii) By Nzvi@bentmentioning

confidence: 98%

Study on influencing factors and mechanism of removal of Cr(VI) from soil suspended liquid by bentonite-supported nanoscale zero-valent iron

Liu

Gao

Cheng

et al. 2020

Sci Rep

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“…As a combination, Fe 0 -BC has the advantages of both biochar and Fe 0 , 44 thereby it provides higher reduction or degradation efficiency and other benefits 45 including easiness to recycle, non-aggregation. (Bakshi et al, 2018;Li et al,2020;46 Dong et al, 2017;Li et al, 2019;). More and more studies proved that Fe 0 -BC show 47 better performance in removing different contaminants through reduction, adsorption, 48 precipitation and other mechanisms (Frick et al,2016;Oh et al, 2016;Oleszczuk and 49 Kołtowski 2017;Mitzia et al,2020).…”

Section: Introdution 26mentioning

confidence: 99%

Synthesis of zero-valent iron/biochar by carbothermal reduction from wood waste and iron mud for removing rhodamine B

Chen

Liu

Gen

et al. 2021

Environ Sci Pollut Res

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This study proposes a new process to synthesize zero-valent iron/biochar (Fe 0 -BC) by carbothermal reduction using wood waste and iron mud as raw materials under different temperature. The characterization results showed that the Fe 0 -BC synthesized at 1200ºC (Fe 0 -BC-1200) possessed favorable adsorption capacity with the specific surface area of 103.18 m 2 /g, and that the zero-valent iron (Fe 0 ) particles were uniformly dispersed 13 on the biochar surface. The removal efficiency of rhodamine B (RB) was determined 14 to evaluate the performance of the prepared Fe 0 -BC. Fe 0 -BC-1200 presented the best 15 performance on RB removal, which mainly ascribe to that more Fe 0 particles generated at higher temperature. The equilibrium adsorption capacity reached 49.93 mg/g when the initial RB concentration and the Fe 0 -BC-1200 dosage were 100 mg/L and 2g/L, respectively, and the pseudo-second-order model was suitable to fit the removal experimental data. LCMC and XRD analyses revealed that the removal mechanism included the physical adsorption of biochar and the redox reaction of Fe 0 . Moreover, copper existed in the iron mud was also reduced to Cu 0 , which was beneficial to catalyze the oxidation of iron, the degradation of RB was promoted at the same time.

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“…Figure 2B shows that k obs decreased from 0.0096 to 0.0021/h as the BDE-209 initial concentrations increased. This was also con rmed by the degradation of organic pollutants by SiO 2 @FeOOH@Fe and Fe-Ni bimetallic particles (Bokare et al 2008;Xie et al 2016;Li et al 2019). The BDE-209 removal by BC-NZVI was likely a process including BDE-209 adsorption on the BC-NZVI surface and subsequent surface reduction reaction.…”

Section: Effect Of Initial Bde-209 Concentration On Its Removalmentioning

confidence: 69%

Remediation and Biological Activity of Nano Zero-valent Iron Supported by Biomass Carbon on Soil Contaminated With Polybrominated Diphenyl Ethers

Song

Zhu

et al. 2021

Preprint

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Polybrominated diphenyl ethers (PBDEs) are toxic to humans and can easily accumulate in the environment. Nanoscale zero-valent iron (NZVI) and modified NZVI have been developed to remediate PBDE contamination. However, their degradation in soil systems and their microbial toxicity have not been widely explored. In this study, NZVI supported on biomass carbon was applied to remove decabromodiphenyl ether (BDE-209) from contaminated soil. A removal efficiency of 100% was achieved within 384 h as BDE-209 reacted with 0.10 g/g soil biomass carbon NZVI particles (BC–NZVI) at pH 7.00. The reaction followed pseudo-first-order kinetics, and the BDE-209 removal efficiency increased with increasing BC–NZVI dosage and decreasing initial BDE-209 concentration, pH, and moisture content. Biological activity assays (dehydrogenase activity and soil basal respiration) were conducted to provide a preliminary risk assessment of the BC–NZVI application in BDE-209 contaminated soil. The results demonstrate that BC–NZVI has a strong potential for in situ remediation of organic-contaminated soil.

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The degradation of decabromodiphenyl ether in the e-waste site by biochar supported nanoscale zero-valent iron /persulfate

Cited by 63 publications

References 42 publications

Study on influencing factors and mechanism of removal of Cr(VI) from soil suspended liquid by bentonite-supported nanoscale zero-valent iron

Study on influencing factors and mechanism of removal of Cr(VI) from soil suspended liquid by bentonite-supported nanoscale zero-valent iron

Synthesis of zero-valent iron/biochar by carbothermal reduction from wood waste and iron mud for removing rhodamine B

Remediation and Biological Activity of Nano Zero-valent Iron Supported by Biomass Carbon on Soil Contaminated With Polybrominated Diphenyl Ethers

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