A review on the capability of zinc oxide and iron oxides nanomaterials, as a water decontaminating agent: adsorption and photocatalysis

Bharti, .; Jangwan, J. S.; Kumar, Smita S.; Kumar, Vivek; Kumar, Ashish; Kumar, D. Praveen

doi:10.1007/s13201-021-01566-3

Cited by 26 publications

(11 citation statements)

References 109 publications

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“…This fact, plus their lowest cost, makes it possible to consider iron compounds for use in natural waters. Studies of Jack et al (2015), Li et al (2007) and Bharti et al (2022) indicated iron compounds can be effective for natural water purification from organic substances. Nevertheless, this issue requires further research.…”

Section: Photodegradation Of Xenobiotics In Surface Watermentioning

confidence: 99%

Photochemical processes in surface water bodies and their potential impacts on the chemical composition of water: A review

2023

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The present study is a review of photochemical processes that occur in surface water bodies and which can affect the chemical composition of water. It is expected that water bodies with a slow rate of water exchange, including lakes, reservoirs, estuaries and ponds with significant areas of shallow water will be most vulnerable to the impacts of these processes. It involves natural organic compounds and xenobiotics of organic origin that enter water bodies from anthropogenic sources or are formed in water bodies because of the development of cyanobacteria and other algae species. Photodegradation of dissolved organic matter (DOM) occurs as a result of both direct photolysis and photosensitized cleavage involving inorganic and organic compounds, which are characterized by chromophore properties, such as humic substances. Photolysis is accompanied by the transformation of high molecular weight organic compounds into lower molecular weight compounds that can become bioavailable to, and promote the development of, microorganisms. Photodegradation results in bioavailable forms of nitrogen and phosphorus being released into the water column. Accordingly, the present study presents the results of analysis of the photochemical destruction of humic substances, such as the most widespread group of the surface water body DOM under the influence of artificial UV irradiation and solar radiation. The results provide data on the products of humic substances photolysis, as well as the influence of the latter on the destruction of a number of organic substances, including xenobiotics (herbicides, pesticides, etc.). Photolysis of algotoxins, which are mainly concentrated in the water of highly trophic reservoirs and lakes during the period of water “blooming,” is among the main concerns being addressed, noting photochemical destruction of these dangerous toxicants can be considered an important means of removing them from drinking water. Also emphasized is that photochemical processes in surface water will likely intensify in the future amid the recent climate changes, also affecting the chemical composition of water.

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Section: Photodegradation Of Xenobiotics In Surface Watermentioning

confidence: 99%

Photochemical processes in surface water bodies and their potential impacts on the chemical composition of water: A review

2023

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“…ZnO NPs and their nanocomposites were explored to adsorb various industrial dyes in addition to other water pollutants, and previous studies showed that zinc oxide is an effective adsorbent for removing many pollutants (Bharti et al 2022;Zafar et al 2019). ZnO is biocompatible and facile in synthesis, while environmental situations do not alter its structural properties (Mohd et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Green Synthesis of ZnO Coated Porous Activated Carbon Prepared from Pontederia crassipe Leaves for the Adsorptive Removal of Toxic Organic Dyes

Allah¹,

Alshamsi

2023

Preprint

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In the current study, new zinc oxide/activated carbon (ZnO/AC) nanocomposites were successfully synthesized, using Pontederia crassipes leaves as a carbon source for synthesis of activated carbon. In addition, the extract of Pontederia crassipes leaves was obtained as reducing and capping agent in the synthesis of ZnO. The synthesized materials were investigated using various characterization techniques including XRD, FTIR, FE-SEM, EDX, BET-BJH, TEM and Raman, which proved the successful synthesis. The synthesized samples were applied as new nanoadsorbents for the uptake of Malachite Green (MG) and Congo Red (CR) dyes from aquatic media. The thermodynamic, adsorption isotherm and kinetic studies were conducted adopting the batch experiment method. The results showed that the optimum efficiency of removal of both dyes was achieved with ZnO/AC (10%) nanocomposite, which was found to be 98.87% for CR dye and 99.23% for MG dye. The thermodynamic analysis exhibited that adsorption process for both dyes is spontaneous. In addition, the results exhibited that the removal of CR onto ZnO/AC(10%) was exothermic, while that of MG was an endothermic. In the case of adsorption isotherms, the Freundlich model showed the best fit for both dyes with a high correlation coefficient (R2) of 0.99, suggesting heterogeneous surface of the synthesized nanoparticles. The kinetic analysis indicated that both dyes followed a pseudo-second-order kinetic model.

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“…As a result, various studies on the adsorption of heavy metals and radionuclides onto ZnONPs have been conducted (Kumar et al 2013;Kaynar et al 2014;Azizi et al 2017;Lagashetty et al 2020;Gu et al 2020;Alqahtany and Khalil 2021;Davarnejad and Nikandam 2022). Due to the importance of ZnONPs in water treatment, a review of their capability as a water decontaminating agent via adsorption and photocatalysis was written (Bharti et al 2022). Another review recorded the synthetic parameters influencing the characteristics of ZnONPs and their use in wastewater treatment (Shaba et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Adsorption mechanism and modeling of radionuclides and heavy metals onto ZnO nanoparticles: a review

et al. 2022

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The contamination of environmental waters with heavy metals and radionuclides is increasing because of rapid industrial and population growth. The removal of these contaminants from water via adsorption onto metal nanoparticles is an efficient and promising technique to abate the toxic effects associated with these pollutants. Among metal nanoparticle adsorbents, zinc oxide nanoparticles (ZnONPs) have received tremendous attention owing to their biocompatibility, affordability, long-term stability, surface characteristics, nontoxicity, and powerful antibacterial activity against microbes found in water. In this review, we considered the adsorption of heavy metals and radionuclides onto ZnONPs. We examined the isotherm, kinetic, and thermodynamic modeling of the process as well as the adsorption mechanism to provide significant insights into the interactions between the pollutants and the nanoparticles. The ZnONPs with surface areas (3.93 to 58.0 m2/g) synthesized by different methods exhibited different adsorption capacities (0.30 to 1500 mg/g) for the pollutants. The Langmuir and Freundlich isotherms were most suitable for the adsorption process. The Langmuir separation factor indicated favorable adsorption of all the pollutants on ZnONPs. The pseudo-second-order kinetics presented the best for the adsorption of the adsorbates with regression values in the range of 0.986–1.000. Spontaneous adsorption was obtained in most of the studies involving endothermic and exothermic processes. The complexation, precipitation, ion exchange, and electrostatic interactions are the probable mechanisms in the adsorption onto ZnONPs with a predominance of complexation. The desorption process, reusability of ZnONPs as well as direction for future investigations were also presented.

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A review on the capability of zinc oxide and iron oxides nanomaterials, as a water decontaminating agent: adsorption and photocatalysis

Cited by 26 publications

References 109 publications

Photochemical processes in surface water bodies and their potential impacts on the chemical composition of water: A review

Photochemical processes in surface water bodies and their potential impacts on the chemical composition of water: A review

Green Synthesis of ZnO Coated Porous Activated Carbon Prepared from Pontederia crassipe Leaves for the Adsorptive Removal of Toxic Organic Dyes

Adsorption mechanism and modeling of radionuclides and heavy metals onto ZnO nanoparticles: a review

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