The enhanced reduction of bromate by highly reactive and dispersive green nano-zerovalent iron (G-NZVI) synthesized with onion peel extract

Lem, Olga; Yoon, Sangho; Bae, Sungjun; Lee, Woojin

doi:10.1039/d0ra09897c

Cited by 9 publications

(4 citation statements)

References 42 publications

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“…5 a,b, the O–H stretching vibrations were represented by an absorption band at 3427 cm −1 . An asymmetric stretching of C–O occurs at 1244 cm −1 resulting in cyclic polyphenol compounds 61 . In Fig.…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic activity of the biogenic mediated green synthesized CuO nanoparticles confined into MgAl LDH matrix

Berede,

Andoshe,

Gultom

et al. 2024

Sci Rep

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The global concern over water pollution caused by organic pollutants such as methylene blue (MB) and other dyes has reached a critical level. Herein, the Allium cepa L. peel extract was utilized to fabricate copper oxide (CuO) nanoparticles. The CuO was combined with MgAl-layered double hydroxides (MgAl-LDHs) via a co-precipitation method with varying weight ratios of the CuO/LDHs. The composite catalysts were characterized and tested for the degradation of MB dye. The CuO/MgAl-LDH (1:2) showed the highest photocatalytic performance and achieved 99.20% MB degradation. However, only 90.03, 85.30, 71.87, and 35.53% MB dye was degraded with CuO/MgAl-LDHs (1:1), CuO/MgAl-LDHs (2:1), CuO, and MgAl-LDHs catalysts, respectively. Furthermore, a pseudo-first-order rate constant of the CuO/MgAl-LDHs (1:2) was 0.03141 min−1 while the rate constants for CuO and MgAl-LDHs were 0.0156 and 0.0052 min−1, respectively. The results demonstrated that the composite catalysts exhibited an improved catalytic performance than the pristine CuO and MgAl-LDHs. The higher photocatalytic performances of composite catalysts may be due to the uniform distribution of CuO nanoparticles into the LDH matrix, the higher surface area, and the lower electron and hole recombination rates. Therefore, the CuO/MgAl-LDHs composite catalyst can be one of the candidates used in environmental remediation.

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Section: Resultsmentioning

confidence: 99%

Photocatalytic activity of the biogenic mediated green synthesized CuO nanoparticles confined into MgAl LDH matrix

Berede,

Andoshe,

Gultom

et al. 2024

Sci Rep

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“…Several nanocatalysts, e.g., zerovalent metals with different supporting materials, have been extensively studied in order to efficiently reduce BrO 3 − via direct electron transfer without H 2 . Various noble and trace metals such as Pd, Pt, and Ru on an activated carbon support, nanoscale-zero-valent iron on modified activated carbon (NZVI/MAC), and Green Nanoscale-Zero-Valent Iron (G-NZVI) catalysts showed an excellent level of performance in eliminating BrO 3 − when no hydrogen was present in their reactions [ 15 , 16 ]. The G-NZVI and NZVI/MAC catalysts showed an enhanced reduction of BrO 3 − at 2 and 5 min with negligible adsorption on the surface by generating ~100% and ~83% of Br − , respectively ( Table 1 ).…”

Section: Nanoscale Heterogeneous Catalysts For Bro 3 ...mentioning

confidence: 99%

The Use of H2 in Catalytic Bromate Reduction by Nanoscale Heterogeneous Catalysts

2022

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The formation of bromate (BrO3−)in groundwater treatment is still a severe environmental problem. Catalytic hydrogenation by nanoscale heterogeneous catalysts with gaseous H2 or solid-state H2 has emerged as a promising approach, which relies on reducing BrO3− to innocuous Br− via the process of direct electron transfer or reduction with atomic hydrogen. Several nanocatalysts have demonstrated high efficiency with a 100% effective BrO3− reduction with greater than 95% of Br− generation in the batch and continuous reactors. However, this technology has not been widely adopted in water treatment systems. Indeed, this research article summarizes the advantages and disadvantages of these technologies by highlighting the factors of nanomaterials reduction efficiency, long-term durability, and stability, as well as addressing the essential challenges limiting the implementation of the use of H2 for BrO3− reduction. In this work, we provide an economic evaluation of catalytic BrO3− removal, safe hydrogen supply, storage, and transportation.

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“… 27 The other plant extracts explored as reductants comprise (list is nonexhaustive) onion peel extract, pomegranate peel extract, and Cleistocalyx operculatus leaf extract. 28 − 30 …”

Section: Introductionmentioning

confidence: 99%

“…Plant extracts have been proven to be impeccable reducing agents, and iron nanoparticles, including nZVI, were successfully synthesized. , The latest studies worth mentioning include the Ricinus communis aqueous seed extract used to synthesize nZVI to treat methylene blue-polluted water . The other plant extracts explored as reductants comprise (list is nonexhaustive) onion peel extract, pomegranate peel extract, and Cleistocalyx operculatus leaf extract. − …”

Section: Introductionmentioning

confidence: 99%

Synthesis of Stabilized Iron Nanoparticles from Acid Mine Drainage and Rooibos Tea for Application as a Fenton-like Catalyst

et al. 2022

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Intensive mining activities generate toxic acid mine drainage (AMD) effluents containing a high concentration of metals, including iron. The chemical synthesis of iron nanoparticles from this waste could lead to further environmental concerns. Therefore, the green synthesis of nanoparticles using plants has gained significant interest because of several benefits, including being eco-friendly. The current study reports a novel approach involving the synthesis of stabilized iron nanoparticles from AMD using rooibos tea extract. An aqueous solution of rooibos tea was prepared and titrated with AMD to reduce Fe 2+ /Fe 3+ . The samples synthesized under optimum conditions were characterized by TEM, XRD, FTIR, UV–Vis, and EDS. The results revealed that the nanoparticles had an average particle size of 36 nm with a spherical shape. These particles showed promising application as a Fenton-like catalyst for the degradation of textile dye (orange II sodium salt) with a removal efficiency of 94% within 30 min. Thus, the stabilized iron nanoparticles synthesized here performed in higher ranges than the currently reported Fenton-like catalysts regarding dye removal efficiency and reaction time.

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The enhanced reduction of bromate by highly reactive and dispersive green nano-zerovalent iron (G-NZVI) synthesized with onion peel extract

Abstract: In this study, novel green nano-zerovalent iron (G-NZVI) is synthesized for the first time using onion peel extract for the prevention of rapid surface oxidation and the enhancement of particle dispersibility with a high reductive capacity.

Cited by 9 publications

References 42 publications

Photocatalytic activity of the biogenic mediated green synthesized CuO nanoparticles confined into MgAl LDH matrix

Photocatalytic activity of the biogenic mediated green synthesized CuO nanoparticles confined into MgAl LDH matrix

The Use of H2 in Catalytic Bromate Reduction by Nanoscale Heterogeneous Catalysts

Synthesis of Stabilized Iron Nanoparticles from Acid Mine Drainage and Rooibos Tea for Application as a Fenton-like Catalyst

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