One-pot synthesis of ZnO nanoparticles supported on halloysite nanotubes for catalytic applications

Massaro, Marina; Casiello, Michele; D’Accolti, Lucia; Lazzara, Giuseppe; Nacci, Angelo; Nicotra, Giuseppe; Noto, Renato; Pettignano, Alberto; Spinella, C.; Riela, Serena

doi:10.1016/j.clay.2020.105527

Cited by 72 publications

(41 citation statements)

References 60 publications

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“…Recently, ZnO nanoparticles (ZnONPs) were immobilized onto HNTs’ surface by a one-pot synthesis (HNTs@ZnO) using, for the first time as Zn 2+ precursor, the commercially available ZnONPs (possessing dimensions of ca. 100 nm) [ 55 ]. By adopting this procedure, supported ZnONPs with smaller dimensions (2.4 nm) than pristine ZnONPs were obtained.…”

Section: Supramolecular Functionalizationmentioning

confidence: 99%

Past, Present and Future Perspectives on Halloysite Clay Minerals

2020

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Halloysite nanotubes (HNTs), clay minerals belonging to the kaolin groups, are emerging nanomaterials which have attracted the attention of the scientific community due to their interesting features, such as low-cost, availability and biocompatibility. In addition, their large surface area and tubular structure have led to HNTs’ application in different industrial purposes. This review reports a comprehensive overview of the historical background of HNT utilization in the last 20 years. In particular it will focus on the functionalization of the surfaces, both supramolecular and covalent, following applications in several fields, including biomedicine, environmental science and catalysis.

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Section: Supramolecular Functionalizationmentioning

confidence: 99%

Past, Present and Future Perspectives on Halloysite Clay Minerals

2020

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“…Important examples of biomass are wood and energy crops, such as for example soy, useful for producing biofuels but also bio-based chemicals and polymers 2 . Recent years have witnessed a rapid growth in the production of fuels 3 and materials entirely deriving from biomasses 4 . However, this has led to many troubles such as improper exploitation of soils (non-food applications), increase of raw materials price (especially in Third World countries), biodiversity reduction, soil erosion and increased risk of insects and bacteria that destroy crops 1 .…”

Section: Introductionmentioning

confidence: 99%

Valorization of cigarette butts for synthesis of levulinic acid as top value-added chemicals

Laurenza¹,

Losito

Casiello

et al. 2021

Sci Rep

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Unprecedented in the literature, levulinic acid (LA), one of the top value-added intermediates of chemical industry, is obtained from cigarette butts as cellulose feedstock by means of a one-pot hydrothermal process carried out at 200 °C for 2 h and catalysed by phosphoric acid. The protocol avoids the use of more aggressive and toxic H2SO4 and HCl, that are generally employed on several cellulose sources (e.g. sludge paper), thus minimizing corrosion phenomena of plants. Neither chemical pre-treatment of butts nor specific purification procedure of LA are required. Notably, by simply modifying acid catalyst (e.g. using CH3COOH), another top value-added fine chemical such as 5-hydroxymethylfuraldehyde (HMF) is obtained, thus widening the scope of the method. Being cigarette filters a waste available in quantities of megatonnes per year, they represent an unlimited at no cost source of cellulose, thus enabling the up-scale to an industrial level of LA production.

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“…as a drug carrier and in drug delivery, as a catalyst support, as a filler for hydrogels and polymers, as an adsorbent of pollutants, etc. (Abdullayev et al 2010;Dong et al 2012;Kamble et al 2012;Wei et al 2013;Owoseni et al 2014;Cataldo et al 2018;Massaro et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Functionalized Halloysite Nanotubes for Enhanced Removal of Hg²⁺ Ions From Aqueous Solutions

Cataldo

Lazzara

Massaro

et al. 2021

Clays and clay miner.

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Water is essential for humans, animals, and plants; pollutants, usually derived from anthropogenic activities, can have a serious effect on its quality. Heavy metals are significant pollutants and are often highly toxic to living organisms, even at very low concentrations. Among the numerous removal techniques proposed, adsorption onto suitable adsorbent materials is considered to be one of the most promising. The objective of the current study was to determine the effectiveness of halloysite nanotubes (HNT) functionalized with organic amino or thiol groups as adsorbent materials to decontaminate polluted waters, using the removal of Hg2+ ions, one of the most dangerous heavy metals, as the test case. The effects of pH, ionic strength (I), and temperature of the metal ion solution on the adsorption ability and affinity of both materials were evaluated. To this end, adsorption experiments were carried out with no ionic medium and in NaNO3 and NaCl at I = 0.1 mol L−1, in the pH range 3–5 and in the temperature range 283.15–313.15 K. Kinetic and thermodynamic aspects of adsorption were considered by measuring the metal ion concentrations in aqueous solution. Various equations were used to fit experimental data, and the results obtained were explained on the basis of both the adsorbent’s characterization and the Hg2+ speciation under the given experimental conditions. Thiol and amino groups enhanced the adsorption capability of halloysite for Hg2+ ions in the pH range 3–5. The pH, the ionic medium, and the ionic strength of aqueous solution all play an important role in the adsorption process. A physical adsorption mechanism enhanced by ion exchange is proposed for both functionalized materials.

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One-pot synthesis of ZnO nanoparticles supported on halloysite nanotubes for catalytic applications

Cited by 72 publications

References 60 publications

Past, Present and Future Perspectives on Halloysite Clay Minerals

Past, Present and Future Perspectives on Halloysite Clay Minerals

Valorization of cigarette butts for synthesis of levulinic acid as top value-added chemicals

Functionalized Halloysite Nanotubes for Enhanced Removal of Hg²⁺ Ions From Aqueous Solutions

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One-pot synthesis of ZnO nanoparticles supported on halloysite nanotubes for catalytic applications

Cited by 72 publications

References 60 publications

Past, Present and Future Perspectives on Halloysite Clay Minerals

Past, Present and Future Perspectives on Halloysite Clay Minerals

Valorization of cigarette butts for synthesis of levulinic acid as top value-added chemicals

Functionalized Halloysite Nanotubes for Enhanced Removal of Hg2+ Ions From Aqueous Solutions

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Product

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Functionalized Halloysite Nanotubes for Enhanced Removal of Hg²⁺ Ions From Aqueous Solutions