Dendrimer encapsulated Silver nanoparticles as novel catalysts for reduction of aromatic nitro compounds

Asharani, Indira Viswambaran; Thirumalai, Dhakshanamurthy; Sivakumar, A.

doi:10.1088/1757-899x/263/2/022010

Cited by 6 publications

(7 citation statements)

References 22 publications

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“…Therefore, the development of effective catalysts for the decomposition of nitrophenols is an urgent and necessary task. To date, many papers have dealt with the reaction of liquid phase hydrogenation of aromatic nitro compounds by using nanoscale heterogeneous catalysts (Figure 7) [69][70][71][72][73][74]. The influence of various factors such as deposition temperature, testing mode, template modification, etc.…”

Section: Assessment Of Catalytic Activitymentioning

confidence: 99%

Cu/CuO Composite Track-Etched Membranes for Catalytic Decomposition of Nitrophenols and Removal of As(III)

et al. 2020

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One of the promising applications of nanomaterials is to use them as catalysts and sorbents to remove toxic pollutants such as nitroaromatic compounds and heavy metal ions for environmental protection. This work reports the synthesis of Cu/CuO-deposited composite track-etched membranes through low-temperature annealing and their application in catalysis and sorption. The synthesized Cu/CuO/poly(ethylene terephthalate) (PET) composites presented efficient catalytic activity with high conversion yield in the reduction of nitro aryl compounds to their corresponding amino derivatives. It has been found that increasing the time of annealing raises the ratio of the copper(II) oxide (CuO) tenorite phase in the structure, which leads to a significant increase in the catalytic activity of the composites. The samples presented maximum catalytic activity after 5 h of annealing, where the ratio of CuO phase and the degree of crystallinity were 64.3% and 62.7%, respectively. The catalytic activity of pristine and annealed composites was tested in the reduction of 4-nitroaniline and was shown to remain practically unchanged for five consecutive test cycles. Composites annealed at 140 °C were also tested for their capacity to absorb arsenic(III) ions in cross-flow mode. It was observed that the sorption capacity of composite membranes increased by 48.7% compared to the pristine sample and reached its maximum after 10 h of annealing, then gradually decreased by 24% with further annealing.

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Section: Assessment Of Catalytic Activitymentioning

confidence: 99%

Cu/CuO Composite Track-Etched Membranes for Catalytic Decomposition of Nitrophenols and Removal of As(III)

et al. 2020

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“…When the hydrogels were stretched, hydrophobic interactions caused the hydrophobic monomers to associate with the ILs-LPs, as the first network can effectively dissipate a great deal of energy and rebuild the network via disentanglement from the hydrophobic segment; in the meantime, the ionic cross-linking between ILs-LPs and hydrophobic monomer can dissipate some energy via unzipping of the charge interaction, overcoming the frangibility of traditional hydrogels. The merit of gel strength was vital to the catalytic reduction in the practical cyclic use. ,, …”

Section: Results and Discussionmentioning

confidence: 99%

“…Therefore, various carriers have been used for sheltering and stabilization of NPs . Hollow porous polystyrene and dendrimer encapsulated Ag-NPs have been fabricated to stabilize Pd nanoparticles with high catalytic efficiency . A facile manner for synthesis of Au NPs is developed to reduce various aromatic nitro compounds .…”

Section: Introductionmentioning

confidence: 99%

Tailored Ionic Liquids Encapsulation Method Endowing Hydrogels with Excellent Mechanical and Catalytic Activity

Liu

LIU

Shao

et al. 2020

ACS Sustainable Chem. Eng.

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Ionic liquids (ILs) hydrogels as an appropriate candidate for the absorption of nanoparticles have gained immense interest because of its environmental friendliness, low cost, high efficiency, and insensitivity to toxic substances. However, conventional ILs hydrogels usually suffer from brittleness and mechanical defects. Herein, a novel entrapped pattern and structural transformation of ILs within a copolymer of acrylamide/N,N-dimethylaminoethyl methacrylate bromododecane hydrophobic monomers p(AM/DMLB)-based hydrogels were prepared through changing the filling pattern of ILs to form toughened hydrophobic association hydrogels. After the ionic liquids latex sphere particles (ILs-LPs) were added, both the ionically cross-linked network and hydrophobic association network were fabricated, which could effectively reconstruct the structure and dissipate energy. It was found that the p(AM/DMLB)/ILs-LPs hydrogels possessed high mechanical properties, and the tensile strength, elongation, and toughness reached 0.49 MPa, 2300%, and 4.9 MJ/m 3 , respectively. Without the addition of other additives and cross-linking agents, the hydrogel could act as a template for in situ and stable Pd nanoparticles. More importantly, the excellent biocompatibility, remoldability, and fatigue resistance endowed the p(AM/DMLB)/ILs-LPs hydrogels/Pd with recycled and reused performances, which was possible for bestowing samples with any desired shape and even giving them the ability to serve as catalysts for promising practical applications. Therefore, the innovative design strategy for ionic liquids' latex sphere particles as the sole joint center of a dual physically cross-linked network could be used to develop robust and stretchable hydrogel materials for catalytic use in the sewage disposal industry.

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“…The first such example is reported lately by Asharani. Polyethylene glycol (PEG) core dendrimer reduced encapsulated silver ions to Ag NPs and effectively catalyzed a wide range of substituted nitroaromatics under the following reduction rate order 4-nitrobenzaldehyde > nitrobenzene > 4-nitrocatechol > 4-nitroaniline > 5-hydroxy-2-nitrobenzaldehyde > 4-nitro anisole > 2-hydroxy-5-nitrobenzylbromide [109]. Functionalization of PAMAM G3 terminal amino groups with long linear PEG chains also permitted the assembly of Cu [110] (Figure 10b) and Au NPs [111] (Figure 10c).…”

Section: Aromatic Nitro-derivates In Generalmentioning

confidence: 99%

Catalytic Neutralization of Water Pollutants Mediated by Dendritic Polymers

et al. 2022

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Radially polymerized dendritic compounds are nowadays an established polymer category next to their linear, branched, and cross-linked counterparts. Their uncommon tree-like architecture is characterized by adjustable internal cavities and external groups. They are therefore exceptional absorbents and this attainment of high concentrations in their interior renders them ideal reaction media. In this framework, they are applied in many environmentally benign implementations. One of the most important among them is water purification through pollutant decomposition. Simple and composite catalysts and photo-catalysts containing dendritic polymers and applied in water remediation will be discussed jointly with some unconventional solutions and prospects.

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Dendrimer encapsulated Silver nanoparticles as novel catalysts for reduction of aromatic nitro compounds

Cited by 6 publications

References 22 publications

Cu/CuO Composite Track-Etched Membranes for Catalytic Decomposition of Nitrophenols and Removal of As(III)

Cu/CuO Composite Track-Etched Membranes for Catalytic Decomposition of Nitrophenols and Removal of As(III)

Tailored Ionic Liquids Encapsulation Method Endowing Hydrogels with Excellent Mechanical and Catalytic Activity

Catalytic Neutralization of Water Pollutants Mediated by Dendritic Polymers

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