Insights into the Synthesis, types and application of iron Nanoparticles: The overlooked significance of environmental effects

In recent years, the number of articles reporting the addition of nanomaterials to enhance the process of anaerobic digestion has exponentially increased. The benefits of this addition can be observed from different aspects: an increase in biogas production, enrichment of methane in biogas, elimination of foaming problems, a more stable and robust operation, absence of inhibition problems, etc. In the literature, one of the current focuses of research on this topic is the mechanism responsible for this enhancement. In this sense, several hypotheses have been formulated, with the effect on the redox potential caused by nanoparticles probably being the most accepted, although supplementation with trace materials coming from nanomaterials and the changes in microbial populations have been also highlighted. The types of nanomaterials tested for the improvement of anaerobic digestion is today very diverse, although metallic and, especially, iron-based nanoparticles, are the most frequently used. In this paper, the abovementioned aspects are systematically reviewed. Another challenge that is treated is the lack of works reported in the continuous mode of operation, which hampers the commercial use of nanoparticles in full-scale anaerobic digesters.

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“…From this work, it is evident that some of these methods could be easily implemented at a commercial scale [63]; 2.…”

Section: Future Challengesmentioning

confidence: 99%

Enhancement of Anaerobic Digestion with Nanomaterials: A Mini Review

et al. 2022

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“…Different synthesis approaches of Fe-based nanomaterials production include co-precipitation, proprietary copyrolysis, solvothermal, sol-gel, emulsion polymerization, hydrothermal, sonochemical, thermal decomposition and green synthesis methods (Yadav et al, 2020a;Otero-González et al, 2020;Singh et al, 2020;Torasso et al, 2021;Selvaraj et al, 2022). Green synthesis methods of Fe-based nanomaterials are environmentally benign and could be considered as a potential substitute of existing chemical and physical methods due to the affordability, abundance of biomaterials and simple operating procedures (Arslan et al, 2022;Xu et al, 2022). Biomaterials such as plant extracts (eg., green tea), vermicomposting leachate, residual food byproduct (e.g, banana peel) and microorganisms have been explored for synthesis of Fe based nanomaterials by several researcher while another study reported the utilization of incense sticks ash waste as precursor for iron oxide nanoparticle synthesis (Majumder et al, 2019;Yadav et al, 2020b;Chatterjee, et al, 2020;Arslan, et al, 2022;Chen et al, 2022).…”

Section: Adsorption Based On Iron Oxide Nanomaterialsmentioning

confidence: 99%

Understanding the adsorption of iron oxide nanomaterials in magnetite and bimetallic form for the removal of arsenic from water

Boruah

Tyagi²,

Gupta³

et al. 2023

Front. Environ. Sci.

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Arsenic decontamination is a major worldwide concern as prolonged exposure to arsenic (>10 µg L-1) through drinking water causes serious health hazards in human beings. The selection of significant, cost-effective, and affordable processes for arsenic removal is the need of the hour. For the last decades, iron-oxide nanomaterials (either in the magnetite or bimetallic form) based adsorptive process gained attention owing to their high arsenic removal efficiency and high regenerative capacity as well as low yield of harmful by-products. In the current state-of-the-art, a comprehensive literature review was conducted focused on the applicability of iron-based nanomaterials for arsenic removal by considering three main factors: (a) compilation of arsenic removal efficiency, (b) identifying factors that are majorly affecting the process of arsenic adsorption and needs further investigation, and (c) regeneration capacity of adsorbents without affecting the removal process. The results revealed that magnetite and bimetallic nanomaterials are more effective for removing Arsenic (III) and Arsenic (V). Further, magnetite-based nanomaterials could be used up to five to six reuse cycles, whereas this value varied from three to six reuse cycles for bimetallic ones. However, most of the literature was based on laboratory findings using decided protocols and sophisticated instruments. It cannot be replicated under natural aquatic settings in the occurrence of organic contents, fluctuating pH and temperature, and interfering compounds. The primary rationale behind this study is to provide a comparative picture of arsenic removal through different iron-oxide nanomaterials (last twelve yearsof published literature) and insights into future research directions.

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“…The findings of the experiments demonstrated that the reaction rate constant of iron nanoparticles was higher than that of conventional iron powder. Accordingly, it has been shown that iron nanoparticles may perform the functions of both reductants and catalysts in order to eliminate heavy metal pollutants [ 108 ]. Recently, Bhattacharjee et al (2021) reported the novel green approach for the synthesis of iron sulfide nanoparticles and studied their efficacy in removing hexavalent chromium.…”

Section: Nanomaterials Used For Heavy Metal Removalmentioning

confidence: 99%

Recent Advances in Adsorptive Nanocomposite Membranes for Heavy Metals Ion Removal from Contaminated Water: A Comprehensive Review

Damiri

Andra²,

Kommineni

et al. 2022

Materials

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Water contamination is one of the most urgent concerns confronting the world today. Heavy metal poisoning of aquatic systems has piqued the interest of various researchers due to the high toxicity and carcinogenic consequences it has on living organisms. Due to their exceptional attributes such as strong reactivity, huge surface area, and outstanding mechanical properties, nanomaterials are being produced and employed in water treatment. In this review, recent advances in the use of nanomaterials in nanoadsorptive membrane systems for wastewater treatment and heavy metal removal are extensively discussed. These materials include carbon-based nanostructures, metal nanoparticles, metal oxide nanoparticles, nanocomposites, and layered double hydroxide-based compounds. Furthermore, the relevant properties of the nanostructures and the implications on their performance for water treatment and contamination removal are highlighted. The hydrophilicity, pore size, skin thickness, porosity, and surface roughness of these nanostructures can help the water permeability of the nanoadsorptive membrane. Other properties such as surface charge modification and mechanical strength can improve the metal adsorption effectiveness of nanoadsorptive membranes during wastewater treatment. Various nanocomposite membrane fabrication techniques are also reviewed. This study is important because it gives important information on the roles of nanomaterials and nanostructures in heavy metal removal and wastewater treatment.

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Insights into the Synthesis, types and application of iron Nanoparticles: The overlooked significance of environmental effects

Cited by 95 publications

References 203 publications

Enhancement of Anaerobic Digestion with Nanomaterials: A Mini Review

Enhancement of Anaerobic Digestion with Nanomaterials: A Mini Review

Understanding the adsorption of iron oxide nanomaterials in magnetite and bimetallic form for the removal of arsenic from water

Recent Advances in Adsorptive Nanocomposite Membranes for Heavy Metals Ion Removal from Contaminated Water: A Comprehensive Review

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