Nanoscale zero valent iron supported on MgAl-LDH-decorated reduced graphene oxide: Enhanced performance in Cr(VI) removal, mechanism and regeneration

Lv, Xiaoshu; Xiaofeng, Qin; Wang, Kaifeng; Peng, Yiyin; Wang, Peng; Jiang, Guangming

doi:10.1016/j.jhazmat.2019.03.091

Cited by 79 publications

(23 citation statements)

References 51 publications

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“…Moreover, it is noteworthy herein that both the reaction rate and elimination efficiency of RBC600-nZVI (1:1) for Cr(VI) were greater than the other mass ratio complexes with the equal mass of nZVI (500 mg/L). These results show that nZVI presence on the surface of biochar certainly plays a pivotal role in the alleviation of Cr(VI) [39]. When using nZVI alone, severe agglomeration (Figure 2a,b) hindered the reaction, resulting in the decreased reducing potential of the iron particles.…”

Section: Effects Of Preparation Conditions On Cr(vi) Removalmentioning

confidence: 84%

Efficient Removal of Hexavalent Chromium from an Aquatic System Using Nanoscale Zero-Valent Iron Supported by Ramie Biochar

et al. 2021

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In this study, ramie biochar (RBC) was used to activate nano zero-valent iron (nZVI) to enhance hexavalent chromium (Cr(VI)) removal. The best results were obtained at a pyrolysis temperature of 600 °C, a biochar particle size of < 150 μm, and an iron to carbon ratio = 1:1. Under the optimal conditions, the removal of Cr(VI) by RBC600-nZVI (98.69%) was much greater than that of RBC600 (12.42%) and nZVI (58.26%). Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS) revealed that the reaction mechanism at the Fe and Cr interface was a multiple interaction mechanism with reduction dominated, adsorption, and co-precipitation simultaneously. The enhanced performance of RBC600-nZVI resulted from the effective dispersion of nZVI on the surface of RBC600, therefore increasing the adsorption activity sites. At the same time, RBC600 and nZVI exerted a synergistic influence on the composite structure, which jointly promoted the reduction reaction of Cr(VI) and removed more Cr(VI). This study shows that RBC-nZVI is a potentially valuable remediation material that not only provides a new idea for the utilization of ramie waste, but also effectively overcomes the limitations of nZVI, thus, achieving efficient and rapid remediation of Cr(VI).

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Section: Effects Of Preparation Conditions On Cr(vi) Removalmentioning

confidence: 84%

Efficient Removal of Hexavalent Chromium from an Aquatic System Using Nanoscale Zero-Valent Iron Supported by Ramie Biochar

et al. 2021

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“…[25] The characteristic band 2θ angles of LDH are 11.4 , 22.8 , 34.3 , 38.3 , 45.3 , 60.4 , 61.7 , corresponding to the diffraction peaks for (003), (006), (009), (015), (018), (110), and (113) planes, respectively. [26] The characteristic diffraction peak of LDH corresponds to the abscissa 2θ angle with a good multiple relationship. Based on the calculation from Scherrer equation, the base layer spacing of the LDH is estimated to be 0.78 nm, which is consistent with the characteristics of the previously reported Mg-Al LDH.…”

Section: Characterizationmentioning

confidence: 94%

“…Based on the calculation from Scherrer equation, the base layer spacing of the LDH is estimated to be 0.78 nm, which is consistent with the characteristics of the previously reported Mg-Al LDH. [26] After the combination of LDH and NGN, the peak shape attributed to LDH was preserved, indicating that LDH diffused well on the surface of NGN, which may prevent the re-stacking of graphene. With the H 2 PO 4…”

Section: Characterizationmentioning

confidence: 97%

Superior thermal stability and smoke suppression of epoxy resin composites with graphene/LDHphosphorus‐rich hybrids

Zhou

Kang

Huang³

et al. 2020

J of Applied Polymer Sci

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In this article, graphene/LDH phosphorus‐rich triple hybrid was prepared by a mild method and used to effectively improve the thermal stability and smoke suppression of epoxy resin (EP). The graphene was firstly reacted with hexamethylenediamine (HA) and followed by the treatment with the layered double hydroxide (LDH) and NaH2PO4 solutions. Compared to the unmodified graphene, the initial decomposition temperature of the triple hybrids increases significantly from 168.6 to 292.5°C. The residual carbon content is greatly improved and the residual mass is up to 84.1%. Elemental analysis reveals the content of phosphorus in EP composites is as high as 10 wt%. In flame retardancy tests, the peak heat release rate of the EP composite with 5 wt% graphene/LDH phosphorus‐rich hybrids decreases to 786.15 KW/m2, 41.19% drastic reduction compared to that of EP. These results indicate that the triple functionalization process effectively expands the interval distribution of heat release and makes the heat release process more gradual and spread flames smaller. The smoke production rate and total smoke production rate of EP composite with 5 wt% graphene/LDH phosphorus‐rich hybrids are 0.32 m2/s and 40.91 m2, which are significantly reduced by 65.22 and 57.83%, respectively. This gentle and efficient process provides a new approach to multi‐functional design to improve the thermal stability and smoke suppression of resin‐based composites.

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“…Therefore, it is more effective if it is modified to form a composite with the supporting material to increase the integrity of the coating. Supporting materials that can be used are carbon-based materials such as activated carbon (Hu et al, 2020), graphite (Lv et al, 2019), biochar (Li et al, 2020) and hydrochar (He et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Competitive Removal of Cationic Dye Using NiAl-LDH Modified with Hydrochar

Normah¹,

Palapa²,

Taher³

et al. 2021

Ecol. Eng. Environ. Technol.

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In this study, NiAl-LDH was modified with hydrochar using the NiAl-Hydrochar composite coprecipitation method. Materials were characterized by XRD and FT-IR analysis. XRD diffractogram and FT-IR spectra show that the NiAl-Hydrochar composite material has the characteristics of the precursors. NiAl-Hydrochar composite materials have a large adsorption capacity to adsorb cationic dyes. The adsorption follows the Langmuir adsorption isotherm model with the maximum capacity (Q max ) of the NiAl-Hydrochar composite material reaching 256.410 mg/g for malachite green and the adsorption process takes place spontaneously and endothermically. The regeneration process of NiAl-Hydrochar composites was more stable and the decrease was not significant (>70%). The selectivity of the dye mixture showed that the adsorbent was more selective for malachite green dye compared to methylene blue and rhodamine-B.

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Nanoscale zero valent iron supported on MgAl-LDH-decorated reduced graphene oxide: Enhanced performance in Cr(VI) removal, mechanism and regeneration

Cited by 79 publications

References 51 publications

Efficient Removal of Hexavalent Chromium from an Aquatic System Using Nanoscale Zero-Valent Iron Supported by Ramie Biochar

Efficient Removal of Hexavalent Chromium from an Aquatic System Using Nanoscale Zero-Valent Iron Supported by Ramie Biochar

Superior thermal stability and smoke suppression of epoxy resin composites with graphene/LDHphosphorus‐rich hybrids

Competitive Removal of Cationic Dye Using NiAl-LDH Modified with Hydrochar

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