Cu2O-CuO@biochar composite: Synthesis, characterization and its efficient photocatalytic performance

Khataee, Alireza; Kalderis, Dimitrios; Gholami, Peyman; Fazli, Arezoo; Moschogiannaki, Marilena; Binas, Vassiliοs; Lykaki, Maria; Konsolakis, Michalis

doi:10.1016/j.apsusc.2019.143846

Cited by 87 publications

(23 citation statements)

References 78 publications

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“…Macroalgae are rich in bioactive amines, sulfates, carboxyl, and hydroxyl compounds, properties that facilitate the binding of dye molecules on the surface of macroalgae-derived biochar (Ahmed et al 2019;Gokulan et al 2019). Another attractive method for the removal of dyes was photodegradation (Chen et al 2019e;Khataee et al 2019;Sharma et al 2019;Zhai et al 2019).…”

Section: Organic Pollutants Removalmentioning

confidence: 99%

Visualizing the emerging trends of biochar research and applications in 2019: a scientometric analysis and review

Wang

et al. 2020

Biochar

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Biochar, derived from thermal pyrolysis of biomass, has been regarded as a low-cost, sustainable and beneficial material and widely applied in agriculture, environment and energy during the last two decades. To elucidate the research status timely and future trends in biochar field, CiteSpace is used to systematically analyze the related literature retrieved from the Web of Science core collection in 2019. Based on the keywords clustering analysis, it was found that "biochar production", "organic pollutants removal", "heavy metals immobilization", "bioremediation" were the main hotspots in research covering biochar. "Bioremediation" is an emerging topic and deserves extensive attention due to its highly effective and environmentally friendly treatment of pollutants. Improving the phytoremediation effect, immobilizing functional microorganisms on biochar, and using microorganisms as raw materials to produce biochar were the common methods of biochar-assisted bioremediation. While studies focused on "soil quality and plant growth" and "biochar and global climate change" decreased, investigations concentrated in the toxicity of biochar to soil biota and ruminants are sustainably growing. Research on direct and catalytic thermal pyrolysis of green waste (mainly microalgae) for biofuels (bio-oil, biodiesel, syngas, etc.) and biochar production is increasing. Converting municipal wastes (e.g., sewage sludge, fallen leaves) into biochar through pyrolysis was a suitable treatment for municipal waste and became a popular topic in recent time. Moreover, the biochar produced from these municipal wastes exhibited excellent performance in the removal of pollutants from wastewater and soil. This review may help to identify future directions in biochar research and applications.

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Section: Organic Pollutants Removalmentioning

confidence: 99%

Visualizing the emerging trends of biochar research and applications in 2019: a scientometric analysis and review

Wang

et al. 2020

Biochar

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“…CuO has high heat of conductivity, electron correlation effects, and spin dynamics [ 21 ]. These properties have led to a wide range of applications in drug delivery [ 22 ], bioimaging [ 23 ], photocatalysis [ 24 , 25 ], and antioxidant agents [ 26 ]. It was also used as an antimicrobial agent against bacterial and fungi [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Biogenic Synthesis of CuO, ZnO, and CuO–ZnO Nanoparticles Using Leaf Extracts of Dovyalis caffra and Their Biological Properties

2022

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Biogenic metal oxide nanoparticles (NPs) have emerged as a useful tool in biology due to their biocompatibility properties with most biological systems. In this study, we report the synthesis of copper oxide (CuO), zinc oxide (ZnO) nanoparticles (NPs), and their nanocomposite (CuO–ZnO) prepared using the phytochemical extracts from the leaves of Dovyalis caffra (kei apple). The physicochemical properties of these nanomaterials were established using some characterization techniques including X-ray diffraction analysis (XRD), ultraviolet-visible spectroscopy (UV-vis), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDX). The XRD result confirmed the presence of a monoclinic CuO (Tenorite), and a hexagonal ZnO (Zincite) nanoparticles phase, which were both confirmed in the CuO–ZnO composite. The electron microscopy of the CuO–ZnO, CuO, and ZnO NPs showed a mixture of nano-scale sizes and spherical/short-rod morphologies, with some agglomeration. In the constituent’s analysis (EDX), no unwanted peak was found, which showed the absence of impurities. Antioxidant properties of the nanoparticles was studied, which confirmed that CuO–ZnO nanocomposite exhibited better scavenging potential than the individual metal oxide nanoparticles (CuO, and ZnO), and ascorbic acid with respect to their minimum inhibitory concentration (IC50) values. Similarly, the in vitro anticancer studies using MCF7 breast cancer cell lines indicated a concentration-dependent profile with the CuO–ZnO nanocomposite having the best activity over the respective metal oxides, but slightly lower than the standard 5-Fluorouracil drug.

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“…, and •OH active species. Khataee et al (2019) prepared Cu 2 O-CuO@biochar and applied it for the photodegradation of reactive orange 29 (RO29). 94% RO29 (20 mg/L) was degraded at pH 8.9 in 90 min.…”

Section: Mixed Metal-based Biocharmentioning

confidence: 99%

Application of biochar-based photocatalysts for adsorption-(photo)degradation/reduction of environmental contaminants: mechanism, challenges and perspective

Cai

Zhang

et al. 2022

Biochar

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The fast increase of population results in the quick development of industry and agriculture. Large amounts of contaminants such as metal ions and organic contaminants are released into the natural environment, posing a risk to human health and causing environment ecosystem problems. The efficient elimination of contaminants from aqueous solutions, photocatalytic degradation of organic pollutants or the in-situ solidification/immobilization of heavy metal ions in solid phases are the most suitable strategies to decontaminate the pollution. Biochar and biochar-based composites have attracted multidisciplinary interests especially in environmental pollution management because of their porous structures, large amounts of functional groups, high adsorption capacities and photocatalysis performance. In this review, the application of biochar and biochar-based composites as adsorbents and/or catalysts for the adsorption of different contaminants, adsorption-photodegradation of organic pollutants, and adsorption-(photo)reduction of metal ions are summarized, and the mechanism was discussed from advanced spectroscopy analysis and DFT calculation in detail. The doping of metal or metal oxides is the main strategy to narrow the band gap, to increase the generation and separation of photogenerated e−-h+ pairs, to produce more superoxide radicals (·O2−) and hydroxyl radicals (·OH), to enhance the visible light absorption and to increase photocatalysis performance, which dominate the photocatalytic degradation of organic pollutants and (photo)reduction of high valent metals to low valent metals. The biochar-based composites are environmentally friendly materials, which are promising candidates in environmental pollution cleanup. The challenge and perspective for biochar-based catalysts are provided in the end. Graphical Abstract

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Cu2O-CuO@biochar composite: Synthesis, characterization and its efficient photocatalytic performance

Cited by 87 publications

References 78 publications

Visualizing the emerging trends of biochar research and applications in 2019: a scientometric analysis and review

Visualizing the emerging trends of biochar research and applications in 2019: a scientometric analysis and review

Biogenic Synthesis of CuO, ZnO, and CuO–ZnO Nanoparticles Using Leaf Extracts of Dovyalis caffra and Their Biological Properties

Application of biochar-based photocatalysts for adsorption-(photo)degradation/reduction of environmental contaminants: mechanism, challenges and perspective

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