CO<sub>2</sub>-switchable polymer-hybrid silver nanoparticles and their gas-tunable catalytic activity

Guo, Zanru; Gu, Hongjian; Ma, Wei; Chen, Qiang; He, Zhanfeng; Zhang, Jiali; Liu, Yongxin; Zheng, Li; Feng, Yujun

doi:10.1039/c7ra09233d

Cited by 6 publications

(9 citation statements)

References 60 publications

(110 reference statements)

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“…The fascinating influence of CO 2 to control hydrophobicity/ hydrophilicity balance was also explored by Guo et al using trithioester terminated poly(N,N-diethylamino-2-ethylmethacrylate) (PDEAEMA) to place the polymer on the surface of growing Ag NPs. 192 However, the 4-NP reduction with this catalyst was so inefficient that it is unclear why these hydrogel changes matter. The tunability of catalytic properties in the temperature range of 25−70 °C in the same reaction has been studied for P(NIPAM-AAm-MAA) microgels with Ag NPs, but again rate constants were unremarkable.…”

Section: Chemical Reviewsmentioning

confidence: 99%

Section: Stimuli Responsive Polymers and Hydrogelsmentioning

confidence: 99%

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Role of Polymer Structures in Catalysis by Transition Metal and Metal Oxide Nanoparticle Composites

2019

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Nanoparticle (NP)/polymer nanocomposites received considerable attention because of their important applications including catalysis. Metal and metal oxide NPs may impart catalytic properties to polymer nanocomposites, while polymers with a different structure, functionality, and architecture control the NP formation (size, shape, location, composition, etc.) and in this way, govern catalytic properties of nanocomposites. In this review we will discuss the influence of the polymer nanostructure (thin or grafted layers, polymer ordering, polymer nanopores), architecture (branched vs linear), functional groups (coordinating or ionic), specific properties (reducing, stimuli responsive, conductive), etc. on the formation of metal or metal oxide NPs and the catalytic behavior of the nanocomposites. The development of novel and efficient catalysts is crucial for progress in chemical sciences, and this explains a huge number of publications in this area in recent years. Taking into consideration previous review articles on NP/polymer catalysts, we limited this review to a discussion of a narrow temporal scope (2017–April 2019), while embracing a broad subject scope, i.e., considering any polymers and NPs which form catalytic nanocomposites. This gives us a unique view of the field of catalytic polymer nanocomposites and allows understanding of where the field is going.

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Section: Chemical Reviewsmentioning

confidence: 99%

Section: Stimuli Responsive Polymers and Hydrogelsmentioning

confidence: 99%

Role of Polymer Structures in Catalysis by Transition Metal and Metal Oxide Nanoparticle Composites

2019

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“…Through manipulating CO 2 -bubbling time and changing the protonation degree of the polymer chains, the activity of the anchored nanocatalysts can be precisely tuned on demand. For example, PDEAEMA chains were reported to have fast response and good cycling performance, and the CO 2 -triggered change of their hydrophilicity has a great influence on the segmental stretch, degree of swelling, , and catalyst solubility in different polymer systems, which can regulate the transfer of the substrates to the active area of catalysts and thus the catalytic process. For example, using CO 2 stimuli-responsive polymer microgels as carriers of metal nanocatalysts and stabilizers to emulsify liquid organic hydrogen carriers can achieve a durable (recyclable) catalysis and programmable hydrogen generation …”

Section: Green Chemistry and Processes Based On Co2-responsive Polyme...mentioning

confidence: 99%

Tailoring CO₂-Responsive Polymers and Nanohybrids for Green Chemistry and Processes

Jiang

Zhang

Huang

et al. 2019

Ind. Eng. Chem. Res.

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Stimuli-responsive materials are functional materials that can change their physical and chemical properties or perform specific functions in response to external stimuli. The use of these materials in chemical reactions and processes can make the production or operations controllable and repeatable (or recyclable), which may allow green chemistry and technologies with lower consumption of matter and energy. Among various stimuli-responsive materials, CO2-responsive polymer materials are highly attractive because of their unique advantages of using CO2 as a trigger in aspects of responding speed, contamination accumulation, operation scale, cost, and environmental friendliness, in addition to the characteristic capability to precisely regulate the response performance of polymers through manipulating their chain structures. In this review, we discuss the development of CO2-responsive polymers and nanocomposites with designed performance from tailoring the polymer chain structures including functionalities, compositions, and topologies, as well as hybridizing with inorganic nanomaterials. Applications of these materials in fields of catalysis, nanoreactors, switchable surfactant/stabilizers, and separation are also summarized in detail. Our focus is on how the CO2-responsive polymer materials with specific properties can be designed to reduce energy consumption and waste production. We believe that by tailoring the chain structures of CO2-responsive polymer materials, customizing their properties, and hybridizing them with functional nanomaterials, they could be utilized in the fields of catalysis, colloids, separations, and others to enable greener and more energy-efficient processes.

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“…However, as for amidine-based CO 2 -responsive polymers, heating is usually needed to expel the captured CO 2 . In contrast, polymer containing tertiary amine groups could realize reversible responsiveness in the same condition upon alternate treatment of CO 2 and N 2 . DEA was an inexpensive, commercially available, and typical monomer with tertiary amine group and was selected as the monomer.…”

Section: Resultsmentioning

confidence: 99%

“…We found previously that the PDEA itself can undergo a hydrophobic–hydrophilic transition by the stimulation of CO 2 , and reported that microgels containing PDEA exhibited size expansion and collapse upon cyclic purging with CO 2 /N 2 . − It was anticipated that the as-fabricated giant microgels are still gas-sensitive. To confirm this speculation, CO 2 gas was introduced into the suspensions of giant microgels.…”

Section: Resultsmentioning

confidence: 99%

Giant Microgels with CO₂-Induced On–Off, Selective, and Recyclable Adsorption for Anionic Dyes

Guo

Chen

et al. 2018

ACS Appl. Mater. Interfaces

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Adsorbents that are capable of controllable pollutants adsorption and release without secondary pollution are attractive in water treatment. Here, we propose eco-friendly CO2 as a trigger to switch the charge states and collapse–expansion transition of giant microgels consisting of hydrophilic acrylamide and hydrophobic 2-(diethylamino)ethyl methacrylate and demonstrated the on–off, selective, and recyclable adsorption of anionic dyes on microgels under CO2 stimulation. Apart from easy-handling separation from the water by a simple filtration process, the maximum adsorption capacity is as high as 821 mg g–1, and the adsorption isotherms and kinetics obeyed Langmuir isotherm and the pseudo-second-order kinetics models, respectively. The anionic dye can also be separated from the mixture solution using CO2-treated microgels. Moreover, a wastewater treatment prototype with microgel-packed column was fabricated. Under continuous flow condition, the dye was removed and recovered by alternative bubbling CO2 and flushing with aqueous alkali (pH 12). Thus, this type of microgels with CO2-induced protonation–deprotonation transition can serve as a cost-effective, environmentally friendly, and efficient adsorbent for water purification applications.

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CO₂-switchable polymer-hybrid silver nanoparticles and their gas-tunable catalytic activity

Abstract: A new type CO2-switchable AgNPs hybrids show switchable and monotonous tunable catalytic activity for the reduction of 4-nitrophenol by varying the flow rate of CO2purged into the reaction system.

Cited by 6 publications

References 60 publications

Role of Polymer Structures in Catalysis by Transition Metal and Metal Oxide Nanoparticle Composites

Role of Polymer Structures in Catalysis by Transition Metal and Metal Oxide Nanoparticle Composites

Tailoring CO₂-Responsive Polymers and Nanohybrids for Green Chemistry and Processes

Giant Microgels with CO₂-Induced On–Off, Selective, and Recyclable Adsorption for Anionic Dyes

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CO2-switchable polymer-hybrid silver nanoparticles and their gas-tunable catalytic activity

Abstract: A new type CO2-switchable AgNPs hybrids show switchable and monotonous tunable catalytic activity for the reduction of 4-nitrophenol by varying the flow rate of CO2purged into the reaction system.

Cited by 6 publications

References 60 publications

Role of Polymer Structures in Catalysis by Transition Metal and Metal Oxide Nanoparticle Composites

Role of Polymer Structures in Catalysis by Transition Metal and Metal Oxide Nanoparticle Composites

Tailoring CO2-Responsive Polymers and Nanohybrids for Green Chemistry and Processes

Giant Microgels with CO2-Induced On–Off, Selective, and Recyclable Adsorption for Anionic Dyes

Contact Info

Product

Resources

About

CO₂-switchable polymer-hybrid silver nanoparticles and their gas-tunable catalytic activity

Tailoring CO₂-Responsive Polymers and Nanohybrids for Green Chemistry and Processes

Giant Microgels with CO₂-Induced On–Off, Selective, and Recyclable Adsorption for Anionic Dyes