New strategies for synthesis and immobilization of methalophtalocyanines onto kaolinite: Preparation, characterization and chemical stability evaluation

Silva, Tiago Honorato da; Souza, Thalita F.M. de; Ribeiro, Anderson Orzari; Calefi, Paulo S.; Ciuffi, Kátia J.; Nassar, Eduardo J.; Molina, Eduardo F.; Hammer, Peter; Faria, Emerson H. de

doi:10.1016/j.dyepig.2016.06.044

Cited by 10 publications

(6 citation statements)

References 27 publications

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“…Additional evidence for the reaction of nitrile groups was provided by the analysis of XPS N1s spectrum for BPFCN‐325, as illustrated in Figure 2. The sample contains nitrogen mainly in the form of nitrile group (399.3 eV) and pyrrole‐like bonds (CNC) (398.8 eV) 30 . And the peak of CNC around 398.8 eV may be attributed to the crosslinking structures generated by the reaction of nitrile.…”

Section: Resultsmentioning

confidence: 99%

Crosslinking modification of poly(arylene ether nitriles) (PEN) based on the synergistic polymerization of aromatic methylene and mono‐cyano

Hong

Zhu

et al. 2022

Journal of Polymer Science

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In order to improve the heat‐resistance of poly(arylene ether nitriles) (PEN), a novel mono‐cyano crosslinking strategy—heat‐induced synergistic polymerization of aromatic methylene and mono‐cyano is proposed and applied in the PEN system. A self‐crosslinkable PEN containing aromatic methylene moieties (PEN‐F) is synthesized by a simple solution polycondensation. PEN‐F can significantly crosslink during relatively mild heat treatment at 300–325°C without any catalyst, transferring from thermoplastic polymers to thermosetting polymers. XRD, FTIR, TGA, DSC and DMA are applied to evaluate the crystallinity, structural evolution and thermal properties of PEN‐F before and after crosslinking. The results suggest that the uncured PEN‐F is amorphous and soluble in some common solvents (THF, DMAc, NMP, etc.). After curing, the heat and solvent resistance of PEN‐F improve remarkably. Especially, the resulting crosslinked product PEN‐F‐325 exhibits a high glass transition temperature (Tg) value of 320°C measured by DMA, increased by 148°C compared to uncured PEN‐F (Tg = 172°C), potentially applicable for high temperature services.

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Section: Resultsmentioning

confidence: 99%

Crosslinking modification of poly(arylene ether nitriles) (PEN) based on the synergistic polymerization of aromatic methylene and mono‐cyano

Hong

Zhu

et al. 2022

Journal of Polymer Science

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“…The amount of APTES involved in the intercalation/functionalization of Kao or Sap was determined from the thermal decomposition of the treated solid. 46 The experimental ratio between the number of moles of APTES per mole of Kao or Sap, X T , was calculated in three stages, by assuming that water was lost by condensation in different steps along the functionalization process. On the basis of the ideal formula, X T was 0.084 mol of APTES/(mol of Kao).…”

Section: Acs Applied Nano Materialsmentioning

confidence: 99%

Adsorption-Based Synthesis of Environmentally Friendly Heterogeneous Chromium(III) Catalysts for Oxidation Reactions into Kaolinite, Saponite, and Their Amine-Modified Derivatives

Vieira

Ferreira

Silva

et al. 2018

ACS Appl. Nano Mater.

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Batch experiments were used to evaluate the Brazilian São Simão kaolinite (Kao), the Spanish Yuncillos saponite (Sa), and their derivatives organofunctionalized with 3-aminopropyltriethoxysilane (Kao-APTES and Sap-APTES) as Cr(III) adsorbents in aqueous medium. Cr(III) concentration and interaction time affected Cr(III) adsorption, which depended strongly on surface charge. The adsorption capacities of Kao and Sap increased after functionalization. Cr(III) adsorption reached equilibrium within 30 min for kaolinite solids and within 120 min for saponite solids. Kinetics tests showed that Cr(III)–adsorbent interactions did not follow a single model, and all the samples fitted the pseudo-second-order model satisfactorily. Equilibrium studies showed that adsorption correctly fits the Langmuir model, but adsorption onto Kao and Sap-APTES fits the Freündlich model better. Desorption experiments showed that Kao-APTES desorbed only 9.7% of Cr(III) cations under different stressing conditions as compared to 47.8% desorption in the case of Sap-APTES. The solids obtained after Cr(III) adsorption were used as heterogeneous catalysts for cis-cyclooctene oxidation reaction, being promising catalysts (conversion higher than 50%) and not showing leaching of Cr(III).

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“…Thanks to their structural similarity with the naturally occurring metal porphyrin, metal phthalocyanine (Pc) complexes, a class of versatile functional molecules, were employed as bio-inspired catalysts, and the application of Pc as a Fenton-like catalyst was also frequently reported [ 27 , 28 , 29 ]. In practical applications, Pc was often prepared in the heterogeneous form for the prevention of the formation of inactive aggregates and the easy recovery of reaction media for recycling purposes [ 28 , 30 , 31 , 32 , 33 ]. Since the heterogeneous catalysis reaction often involves the diffusion of the reactants from the bulk phase to the external surface of the catalyst, adsorption of the reactants onto the catalyst, and catalytic reaction at specific active sites, the catalytic efficiency of the heterogeneous catalyst relies extensively on the adsorption process [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

Efficient Catalytic Degradation of Phenol with Phthalocyanine-Immobilized Reduced Graphene–Bacterial Cellulose Nanocomposite

Sun

Fan

et al. 2021

Nanomaterials

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In this report, phthalocyanine (Pc)/reduced graphene (rG)/bacterial cellulose (BC) ternary nanocomposite, Pc-rGBC, was developed through the immobilization of Pc onto a reduced graphene–bacterial cellulose (rGBC) nanohybrid after the reduction of biosynthesized graphene oxide-bacterial cellulose (GOBC) with N2H4. Field emission scanning electron microscopy (FESEM) and Fourier transform infrared spectroscopy (FT-IR) were employed to monitor all of the functionalization processes. The Pc-rGBC nanocomposite was applied for the treatment of phenol wastewater. Thanks to the synergistic effect of BC and rG, Pc-rGBC had good adsorption capacity to phenol molecules, and the equilibrium adsorption data fitted well with the Freundlich model. When H2O2 was presented as an oxidant, phenol could rapidly be catalytically decomposed by the Pc-rGBC nanocomposite; the phenol degradation ratio was more than 90% within 90 min of catalytic oxidation, and the recycling experiment showed that the Pc-rGBC nanocomposite had excellent recycling performance in the consecutive treatment of phenol wastewater. The HPLC result showed that several organic acids, such as oxalic acid, maleic acid, fumaric acid, glutaric acid, and adipic acid, were formed during the reaction. The chemical oxygen demand (COD) result indicated that the formed organic acids could be further mineralized to CO2 and H2O, and the mineralization ratio was more than 80% when the catalytic reaction time was prolonged to 4 h. This work is of vital importance, in terms of both academic research and industrial practice, to the design of Pc-based functional materials and their application in environmental purification.

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New strategies for synthesis and immobilization of methalophtalocyanines onto kaolinite: Preparation, characterization and chemical stability evaluation

Cited by 10 publications

References 27 publications

Crosslinking modification of poly(arylene ether nitriles) (PEN) based on the synergistic polymerization of aromatic methylene and mono‐cyano

Crosslinking modification of poly(arylene ether nitriles) (PEN) based on the synergistic polymerization of aromatic methylene and mono‐cyano

Adsorption-Based Synthesis of Environmentally Friendly Heterogeneous Chromium(III) Catalysts for Oxidation Reactions into Kaolinite, Saponite, and Their Amine-Modified Derivatives

Efficient Catalytic Degradation of Phenol with Phthalocyanine-Immobilized Reduced Graphene–Bacterial Cellulose Nanocomposite

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