Simultaneous valorization of polyvinyl chloride and eggshell wastes by a semi-industrial mechanochemical approach

Baláž, Matěj; Bujňáková, Zdenka; Achimovičová, Marcela; Tešinský, Matej; Baláž, Peter

doi:10.1016/j.envres.2018.12.005

Cited by 29 publications

(18 citation statements)

References 44 publications

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“…Different types of mill, producing a different nature and intensity of mechanical energy, which is applied to the mechanochemical synthesis, can determine its course, and the formation of centers responsible for a solid-state reaction [ 33 ]. The products of the same mechanochemical reaction obtained using different types of mills may differ in crystal structure, morphology, and properties, as has already been demonstrated in a couple of papers by our research group [ 27 , 34 ]. The planetary and vibratory mills differ in several aspects of the working regime.…”

Section: Introductionmentioning

confidence: 73%

“…Higher content of the orthorhombic phase, in the case of planetary ball milling, most probably points to a more pronounced first-order transition of α-CuSe to β-CuSe. This is most probably a result of the fact that the local temperatures in the planetary ball mill are higher than in the case of the vibratory mill, as more pronounced reaction progress has been found when comparing the two types of mills in the past [ 27 , 34 ].…”

Section: Resultsmentioning

confidence: 99%

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Comparative Study of Nanostructured CuSe Semiconductor Synthesized in a Planetary and Vibratory Mill

et al. 2020

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Copper(II) selenide, CuSe was prepared from Cu and Se powders in a stoichiometric ratio by a rapid, and convenient one-step mechanochemical synthesis, after 5 and 10 min of milling in a planetary, and an industrial vibratory, mill. The kinetics of the synthesis, and the structural, morphological, optical, and electrical properties of CuSe products prepared in the two types of mill were studied. Their crystal structure, physical properties, and morphology were characterized by X-ray diffraction, specific surface area measurements, particle size distribution, scanning, and transmission electron microscopy. The products crystallized in a hexagonal crystal structure. However, a small amount of orthorhombic phase was also identified. The scanning electron microscopy revealed that both products consist of agglomerated particles of irregular shape, forming clusters with a size ~50 mm. Transmission electron microscopy proved the nanocrystalline character of the CuSe particles. The optical properties were studied using UV–Vis and photoluminescence spectroscopy. The determined band gap energies of 1.6 and 1.8 eV for the planetary- and vibratory-milled product, respectively, were blue-shifted relative to the bulk CuSe. CuSe prepared in the vibratory mill had lower resistivity and higher conductivity, which corresponds to its larger crystallite size in comparison with CuSe prepared in the planetary mill.

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Section: Introductionmentioning

confidence: 73%

Section: Resultsmentioning

confidence: 99%

Comparative Study of Nanostructured CuSe Semiconductor Synthesized in a Planetary and Vibratory Mill

et al. 2020

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“…On the one hand, mechanical treatment of chicken eggshell has enabled to retrieve valuable calcium carbonate (CaCO 3 ) from this biowaste [160] . Complementarily, CaCO 3 contained in eggshell has also been used to mechanochemically dechlorinate industrial polyvinyl chloride, thus simultaneously valorizing two types of waste [161] …”

Section: Mechanochemistry and The Twelve Principles Of Green Chemistrymentioning

confidence: 99%

Sustainability Assessment of Mechanochemistry by Using the Twelve Principles of Green Chemistry

2021

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In recent years, mechanochemistry has been growing into a widely accepted alternative for chemical synthesis. In addition to their efficiency and practicality, mechanochemical reactions are also recognized for their sustainability. The association between mechanochemistry and Green Chemistry often originates from the solvent-free nature of most mechanochemical protocols, which can reduce waste production. However, mechanochemistry satisfies more than one of the Principles of Green Chemistry. In this Review we will present a series of examples that will clearly illustrate how mechanochemistry can significantly contribute to the fulfillment of Green Chemistry in a more holistic manner.

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“…Several ways have been reported to manage eggshells waste typically destined for landfill and some others such as soil conditioner, fertilizer, animal feed, additive food, adsorbent, calcium supplement, paper manufacture, and material re-used through recycling, all having the potential to be more sustainable methods 3 , 14 , 15 . Recently, researches have studied on using eggshells for removing dyes 16 , 17 and heavy metals 18 – 24 from wastewater, adsorbing of phosphorus or phosphate 25 , 26 , recycling of polyvinyl chloride 27 , synthesis of PbS/CaCO 3 nanocomposites for degradation of tetracycline 28 , and preparing bio-adsorbent 29 and composites as catalyst for some reactions 30 , 31 . Eggshell membrane has also been used to produce biochar-supported Cu 2+ /Cu + composite for ractopamine detection 32 , CuO–ZnO nanocomposites for water purification 33 , and nano-silver-decorated microfibrous eggshell membrane for wound healing and preventing bacterial infection 34 .…”

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confidence: 99%

Simple recycling of biowaste eggshells to various calcium phosphates for specific industries

Laohavisuti

Boonchom

Boonmee

et al. 2021

Sci Rep

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Egg consumption is very high throughout the world and with it comes enormous amount of waste eggshells. To reduce and utilize these wastes, eggshell wastes were simply transformed to low- or high-purity calcium carbonate grades by washing, crushing, and drying to use as raw materials for producing highly valuable calcium phosphate products. Low-purity calcium carbonate grade was used to prepare triple superphosphate for using in fertilizer industry, whereas high-purity calcium carbonate grade was used to produce dicalcium phosphate dihydrate, monocalcium phosphate monohydrate, and tricalcium phosphate for using in mineral feed and food additive industries. All calcium phosphate samples obtained by simple, rapid, cheap, and environmentally safe method using eggshells and phosphoric acid were identified and their structural phases and impurities were determined by XRF, XRD and FTIR techniques. Thermal behaviors of raw materials and the prepared calcium phosphates excepted tricalcium phosphate were investigated by TG/DTG techniques. The methodologies described here will be useful to manage eggshells by converting them to highly valuable products, which can solve eggshell wastes problem from industries and communities. This finding supports the viewpoint of zero waste operation to produce value-added products for obtaining sustainable development, which may be selected as an alternative way for material recycling and waste management in the future.

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Simultaneous valorization of polyvinyl chloride and eggshell wastes by a semi-industrial mechanochemical approach

Cited by 29 publications

References 44 publications

Comparative Study of Nanostructured CuSe Semiconductor Synthesized in a Planetary and Vibratory Mill

Comparative Study of Nanostructured CuSe Semiconductor Synthesized in a Planetary and Vibratory Mill

Sustainability Assessment of Mechanochemistry by Using the Twelve Principles of Green Chemistry

Simple recycling of biowaste eggshells to various calcium phosphates for specific industries

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