Bioremediation of benzene-contaminated groundwater by calcium peroxide (CaO2) nanoparticles: Continuous-flow and biodiversity studies

Mosmeri, Hamid; Gholami, Fatemeh; Shavandi, Mahmoud; Dastgheib, Seyed Mohammad Mehdi; Alaie, Ebrahim

doi:10.1016/j.jhazmat.2019.02.071

Cited by 56 publications

(17 citation statements)

References 42 publications

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“…It has resulted from the direct effect of oxygen-releasing nanoparticles on microbial growth. Present findings seem to be consistent with the results of Mosmeri et al (2019) and Gholami et al (2018), which investigated the impact of CaO 2 on groundwater microbial communities. It can also be indicated from Figure 3C that the attached microbial communities, due to more desirable oxygen conditions in column III, formed a thicker biofilm compared to others.…”

Section: Microscopic Analysis Of Microbial Biofilm On the Sand Surfacesupporting

confidence: 93%

“…Oxygen-releasing compounds, like calcium peroxide (CaO 2 ), decompose to oxygen and hydroxyl radicals after exposure to water and accelerate the contaminant degradation ( Mosmeri et al, 2018 , 2019 ). According to previous studies, the generated O 2 stimulates the intrinsic groundwater microorganisms, and OH ● radicals destroy the aromatic structure of pollutants ( Yeh et al, 2010 ; Gholami et al, 2019 ).…”

Section: Introductionmentioning

confidence: 99%

“…According to previous studies, the generated O 2 stimulates the intrinsic groundwater microorganisms, and OH ● radicals destroy the aromatic structure of pollutants ( Yeh et al, 2010 ; Gholami et al, 2019 ). CaO 2 nanoparticles have been applied for groundwater treatment in a lot of research ( Cassidy and Irvine, 1999 ; Xue et al, 2018 ; Mosmeri et al, 2019 ). For instance, in Qian et al (2016) study, 2,4-dichlorophenol was removed by nanoscale CaO 2 from groundwater.…”

Section: Introductionmentioning

confidence: 99%

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Genome-resolved analyses of oligotrophic groundwater microbial communities along phenol pollution in a continuous-flow biodegradation model system

et al. 2023

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Groundwater pollution is one of the major environmental concerns. The entrance of pollutants into the oligotrophic groundwater ecosystems alters native microbial community structure and metabolism. This study investigated the application of innovative Small Bioreactor Chambers and CaO2 nanoparticles for phenol removal within continuous-flow sand-packed columns for 6 months. Scanning electron microscopy and confocal laser scanning microscopy analysis were conducted to indicate the impact of attached biofilm on sand surfaces in bioremediation columns. Then, the influence of each method on the microbial biodiversity of the column’s groundwater was investigated by next-generation sequencing of the 16S rRNA gene. The results indicated that the simultaneous application of biostimulation and bioaugmentation completely eliminated phenol during the first 42 days. However, 80.2% of phenol remained in the natural bioremediation column at the end of the experiment. Microbial diversity was decreased by CaO2 injection while order-level groups known for phenol degradation such as Rhodobacterales and Xanthomonadales dominated in biostimulation columns. Genome-resolved comparative analyses of oligotrophic groundwater prokaryotic communities revealed that Burkholderiales, Micrococcales, and Cytophagales were the dominant members of the pristine groundwater. Six-month exposure of groundwater to phenol shifted the microbial population towards increasing the heterotrophic members of Desulfobacterales, Pseudomonadales, and Xanthomonadales with the degradation potential of phenol and other hydrocarbons.

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Section: Microscopic Analysis Of Microbial Biofilm On the Sand Surfacesupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Genome-resolved analyses of oligotrophic groundwater microbial communities along phenol pollution in a continuous-flow biodegradation model system

et al. 2023

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“…Calcium peroxide, which is a conventional oxygen-providing compound, is widely used for heavy metal fixation and the decomposition and absorption of organic contaminants due to the production of hyperoxide. − The decomposition of calcium peroxide in water also produces abundant hydroxyl salts, which are frequently used for the efficient immobilization of heavy metal ions and the remediation of acidic soil. ,, These characteristics make calcium peroxide an ideal ingredient for seed coating. However, calcium peroxide has a high water-absorption ability and limits seed water absorption, which alone is not favorable for seed germination .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Calcium Peroxide into Amphiphilic Nest-like Attapulgite/SiO₂ as a Seed Coating Nanocomposite of Wheat That Confers Resistance to Multiple Environmental Stresses

2022

ACS Agric. Sci. Technol.

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The seed germination of large-scale crops, such as wheat, is frequently affected by diverse environmental stresses. Thus, the development of eco-friendly seed-coating nanomaterials for wheat to maintain a high germination activity while increasing adaptation to adverse environmental conditions has a very high application potential in agriculture. In this study, a seed-coating nanocomposite was fabricated by loading calcium peroxide into amphiphilic nest-like attapulgite/SiO2 and used as an efficient coating reagent (CAS) to maintain the high seed germination activity of wheat. CAS effectively improved wheat seed germination and subsequent seedling establishment under multiple environmental stresses. CAS not only promoted water absorption and retention but also effectively absorbed the carbon dioxide produced by seed respiration and gradually emitted oxygen, which significantly increased the high seed germination activity and shortened the germination time. In addition, CAS showed a high capacity for the immobilization of heavy metals, such as cadmium and copper, which prevented heavy metal absorption by seeds and seedlings, thus largely reducing heavy metal toxicity in the environment. Furthermore, CAS could continuously produce a low level of hydrogen peroxide around the seeds, which effectively prevented microbial infection during seed germination and seedling establishment. In addition, the biosafety analysis of CAS showed that it had no adverse effects on mammalian cell growth or fish viability, suggesting its biosafety. Conclusively, this study provided an effective, low-cost, and environmentally friendly seed coating strategy for the large-scale crops, which has promising application prospects in agriculture.

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“…This means that the oxidizing capacity of the combined Fenton-like process is varied with the different target pollutants. Moreover, nanoscale CaO 2 (nCaO 2 ) were synthesized and displayed better dispersion and transportation ability than commercial CaO 2 from our previous study, owing to their smaller particle size and larger surface area (Qian et al 2013(Qian et al , 2016Mosmeri et al 2019;Ali et al 2020;Sun et al 2020). Therefore, nCaO 2 have been showing great perspective and attraction to scientists and engineers.…”

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confidence: 99%

Degradation of BTEX in groundwater by nano-CaO2 particles activated with L-cysteine chelated Fe(III): enhancing or inhibiting hydroxyl radical generation

et al. 2021

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The simultaneous oxidation performance of benzene, toluene, ethylbenzene, and xylene (BTEX) by nanoscale calcium peroxide particles (nCaO2) activated with ferric ions (Fe(III)) and the mechanism of the enhancement of BTEX degradation by L-cysteine (L-cys) were investigated. The batch experimental results showed that the nCaO2/Fe(III)/L-cys process was effective in the destruction of BTEX in both ultrapure water and actual groundwater. A proper amount of L-cys could enhance BTEX degradation due to the promotion of Fe(II)/Fe(III) redox cycles by the participation of L-cys, but excessive presence of L-cys would cause inhibition. Adding 1.0 mM L-cys to the nCaO2/Fe(III) system, the concentration of Fe(II) increased to 1.15 mM instantly. Simultaneously, the yield of HO• produced by 1.0 mM L-cys-containing system was 0.066 mM at 180 min reaction, higher than that without L-cys (0.049 mM). When excess L-cys (5.0 mM) was added to the system, the amount of Fe(II) increased to 3.73 mM because excessive L-cys caused a large number of Fe(III) in the system to be reduced. However, the yield of HO• decreased to 0.043 mM since excessive Fe(II) could conversely scavenge HO• to produce Fe(III) again. EPR tests and quenching results indicated that HO• was the dominant reactive species in the nCaO2/Fe(III)/L-cys system. For the removal of BTEX, the optimal molar ratio of nCaO2/Fe(III)/L-cys was 10.5/20/1 based on the calculation by RSM. Finally, the BTEX destruction pathway was proposed according to the detected intermediates by LC-MS.

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Bioremediation of benzene-contaminated groundwater by calcium peroxide (CaO2) nanoparticles: Continuous-flow and biodiversity studies

Cited by 56 publications

References 42 publications

Genome-resolved analyses of oligotrophic groundwater microbial communities along phenol pollution in a continuous-flow biodegradation model system

Genome-resolved analyses of oligotrophic groundwater microbial communities along phenol pollution in a continuous-flow biodegradation model system

Fabrication of Calcium Peroxide into Amphiphilic Nest-like Attapulgite/SiO₂ as a Seed Coating Nanocomposite of Wheat That Confers Resistance to Multiple Environmental Stresses

Degradation of BTEX in groundwater by nano-CaO2 particles activated with L-cysteine chelated Fe(III): enhancing or inhibiting hydroxyl radical generation

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Bioremediation of benzene-contaminated groundwater by calcium peroxide (CaO2) nanoparticles: Continuous-flow and biodiversity studies

Cited by 56 publications

References 42 publications

Genome-resolved analyses of oligotrophic groundwater microbial communities along phenol pollution in a continuous-flow biodegradation model system

Genome-resolved analyses of oligotrophic groundwater microbial communities along phenol pollution in a continuous-flow biodegradation model system

Fabrication of Calcium Peroxide into Amphiphilic Nest-like Attapulgite/SiO2 as a Seed Coating Nanocomposite of Wheat That Confers Resistance to Multiple Environmental Stresses

Degradation of BTEX in groundwater by nano-CaO2 particles activated with L-cysteine chelated Fe(III): enhancing or inhibiting hydroxyl radical generation

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Fabrication of Calcium Peroxide into Amphiphilic Nest-like Attapulgite/SiO₂ as a Seed Coating Nanocomposite of Wheat That Confers Resistance to Multiple Environmental Stresses