Synthesis, properties and applications of silica-immobilized 8-quinolinol

Lan, Chi-Ren; Yang, Mo‐Hsiung

doi:10.1016/0003-2670(94)85108-5

Cited by 24 publications

(5 citation statements)

References 22 publications

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“…2a) can reveal successful reaction between G and HQ. As seen, G-HQ displayed a broad band at about 3355 cm À1 corresponding to the stretching vibration of NAH and OAH, as well as the combined absorption peak of NAH bending and CAN stretching vibration at 1635 cm À1 indicated the amide I band from G, and meanwhile, the benzene ring skeleton vibration at 1574/1504 cm À1 and CAH bending vibration at 1462 cm À1 suggested the phenyl/pyridine hydroxyl group from the HQ [40,41]. Characteristic peaks observed at 1273 and 1157 cm À1 were possibly due to the asymmetric and symmetrical stretching vibrations of etheroxy groups (CAOAC) in ester groups, while peak at 1115 cm À1 quite resulted from the stretching vibration of CAO.…”

Section: Preparation and Characterizations Of G-hq-c Iipsmentioning

confidence: 86%

Green multi-functional monomer based ion imprinted polymers for selective removal of copper ions from aqueous solution

Wang

et al. 2019

Journal of Colloid and Interface Science

122

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Section: Preparation and Characterizations Of G-hq-c Iipsmentioning

confidence: 86%

Green multi-functional monomer based ion imprinted polymers for selective removal of copper ions from aqueous solution

Wang

et al. 2019

Journal of Colloid and Interface Science

122

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“…Contudo apesar desta lacuna, estes materiais têm sido aplicados com sucesso nos mais diversos sistemas de pré-concentração ou separação em linha 18,19 , acoplados com vários tipos de detecção, para determinação de íons metálicos presentes em baixas concentrações.…”

Section: Estabilidade Da Hqsgunclassified

Imobilização de 8-hidroxiquinoleína em sílica gel. Melhorias na tradicional rota de diazotação

Vaz¹,

Pitombo²

1999

Quím. Nova

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IMMOBILIZATION OF 8-HYDROXIQUINOLEIN IN SILICA GEL. IMPROVEMENTS IN THETRADITIONAL DIAZOTATION ROUTE. Some modifications made at silanization step and the introduction of ρ-nitrobenzil bromide as an alternative reagent to the 8-hydroxiquinolein immobilization in silica gel were important points that brought up the reduction of synthesis time, efficency improvement of the immobilization process and better hydrolysis stabilization to the final materials. The caracterization was made by infrared spectroscopy, elementary analysis, complexing capacity and acid-base properties.Keywords: immobilized 8-hydroxiquinoleine; silica gel. ARTIGO INTRODUÇÃOA elaboração de novos materiais a partir da modificação química de suas superfícies tem-se mostrado extremamente atraente, seja no desenvolvimento de novas tecnologias ou seja na aplicação destes materiais. Pode-se encontrar aplicações na indústria têxtil, no preparo de cerâmicas supercondutoras, na construção de eletrodos modificados 1 , em catálise heterogênea, no preparo de fases estacionárias para aplicações cromatográ-ficas, em sistemas separação e pré-concentração de alguns íons metálicos ou ânions entre outras.Entretanto, apesar das várias áreas em que estes materiais possam ser aplicados, alguns aspectos que regem os mecanismos de modificação das superfícies ainda permanecem obscuros. Fatores que envolvem a ligação química dos agentes modificadores à superfície do suporte ainda estão sendo caracterizados de forma empírica e restritos a determinadas situações.Dentre os suportes disponíveis para emprego em cromatografia, a sílica gel tem sido a mais utilizada por apresentar boa resistência mecânica, estabilidade e alta velocidade de transferência de massa, necessários a estes sistemas de separação. Diversas rotas foram desenvolvidas para a modificação quími-ca da superfície da sílica gel, existindo considerável quantidade de informação sobre a ligação de cadeias alquílicas, grupamentos aromáticos, grupamentos amino e diversos grupamentos quelantes 2 .A modificação química da superfície da sílica gel envolve basicamente dois processos. Inicialmente, o suporte deve ser quimicamente alterado para ter sua reatividade aumentada. E no caso de sílica gel, usualmente, esta etapa é efetuada empregando-se um aminoalquilalcoxissilano, que ancora grupamentos amina na superfície da sílica gel. Posteriormente, nesta nova superfície mais reativa inserem-se, se necessário, outros grupamentos antes de se efetuar a ligação do grupo de interesse.Diversos grupos funcionais podem ser ancorados na superfície da sílica gel, sendo a escolha destes direcionada em função da aplicação pretendida para o material. Quando desejase efetuar separações ou pré-concentração de íons metálicos em baixas concentrações a 8-hidroxiquinoleína (HOX) tem sido ostensivamente empregada. Suas propriedades como agente quelante estão bem caracterizadas 3 , formando complexos com cerca de 60 íons metálicos. Também existem indíci-os que algumas destas propriedades possam ser transpostas 4 , do meio homogêneo para o me...

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“…Modification of the surface of porous inorganic matrices of different chemical nature with 8-oxyquinoline and its derivatives allows obtaining sorbents for ions of many transition metals, which are widely used in chromatography, hybrid and combined methods of analysis, etc. [15][16][17][18][19][20][21] Polymers with oxyquinoline groups also show complex-forming activity with transition metal ions due to their coordination to nitrogen and quinoline oxygen atoms. 22 We performed in situ immobilization of poly[8oxyquinoline methacrylate] on the surface of silica gel 23 and found that the sorption capacity of silica gel after in situ modification of poly[8-oxyquinoline methacrylate] increases relative to Cu (II), Cd (II), Fe (III) and Mn (II) ions.…”

Section: Introductionmentioning

confidence: 99%

Wood Polymer Composite Based on a Styrene and Triethoxy(Vinylphenethyl)silane

Mukbaniani¹,

Aneli²,

Tatrishvili³

et al. 2023

ChChT

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Today obtaining environmentally friendly wood composite materials is one of the main tasks. The urea-, phenol-, and melamine-formaldehyde resins used today are harmful to the human body and have a long-lasting effect. Therefore, replacing these and other resins with safe binders is one of the major problems. The aim of the work was to obtain and research ecologically safe wood polymer composites-deckings based on a new environmentally safe binder and a reinforcing agent triethoxy(vinylphenethyl)silane and styrene (in-situ polymerization) with a pine sawdust filler and aluminum hydroxide as an antioxidant. On the basis of triethoxy(vinylphenethyl)silane, styrene, and sawdust, the wood polymer composites – deckings have been obtained by hot pressing method at different temperatures and ratios of used components in the presence of antioxidant. For deckings surface, a morphological examination using optical microscopy, scanning electron microscopic (SEM), and energy-dispersive X-ray roentgenographic microanalysis were performed. Water absorption, softening temperature (Vicat), strength on bending, and impact viscosity were determined. Besides, using sawdust as coupling and reinforcement agents, and aluminum hydroxide as an antioxidant, wood polymer composites (WPC) were obtained by hot pressing at different tempe¬ratures. For the obtained composites, the morphological study of the surface was carried out using optical micro¬scopy and scanning electron microscopy, energy disper¬sive X-ray microanalysis. Water absorption of compo¬sites, bending yield stress, impact strength, and softening temperature were determined by the Vicat method. The obtained composites were characterized by higher phy-sicomechanical properties and water absorption.

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Synthesis, properties and applications of silica-immobilized 8-quinolinol

Cited by 24 publications

References 22 publications

Green multi-functional monomer based ion imprinted polymers for selective removal of copper ions from aqueous solution

Green multi-functional monomer based ion imprinted polymers for selective removal of copper ions from aqueous solution

Imobilização de 8-hidroxiquinoleína em sílica gel. Melhorias na tradicional rota de diazotação

Wood Polymer Composite Based on a Styrene and Triethoxy(Vinylphenethyl)silane

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