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EDIÇÃO ATUAL vol. 47, No. 8, 2024



Artigo de Capa
Quim. Nova 2024, 47(8), e-20240033, 1-10

Biofuel production from solid and liquid fractions of hydrothermally pretreated sugarcane bagasse in a continuous compartmentalized reactor and potential metabolic pathways

Laís A. SoaresI; Lucas T. FuessI,*; Tiago P. DelfornoII; Valéria M. OliveiraIII; Edson L. SilvaIV; Maria B. A. VarescheI

An innovative bioH2-producing biofilm reactor was fed with hydrolysate from sugarcane bagasse hydrothermal pretreatment. Bagasse fibers were used as support media for biomass growth. Best fermentation performance was obtained at a 28-h hydraulic retention time.

http://dx.doi.org/10.21577/0100-4042.20240033

Publicado online: março 20, 2024
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Total access: 428

Artigo de Contra Capa
Quim. Nova 2024, 47(8), e-20240034, 1-8

Green synthesis of FexOy structures using Euterpe oleracea mart extract from the legal Amazon, Brazil

Simara F. BorgesI; Karollyne S. AndradeI; Evilly C. VazI; Manoel D. Morais NetoI; Aluisio A. CabralII; Eledir V. SobrinhoIII; Cláudia Q. da RochaIV; Gilvan P. de FigueredoI,*

The aqueous açaí extract (Euterpe oleracea Mart) was used as a natural organic precursor in the synthesis of α-Fe2O3 and Fe3O4 oxides. It was possible to investigate the microstructural parameters of hematite and magnetite phase.

http://dx.doi.org/10.21577/0100-4042.20240034

Publicado online: março 20, 2024
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Total access: 398

Artigo Quim. Nova 2024, 47(8), e-20240029, 1-5

 

Improved acidity of mesoporous ZrO2-WO3 through NH3-AIR subsection-calcination treatment

Chengwei Jin; Bonan Xu; Biao Xu; Jianzhong Guo; Sha Li*


NH3-Air subsection-calcination can induce the formation of WOx clusters that act as strong Brønsted acid sites.

http://dx.doi.org/10.21577/0100-4042.20240029

Publicado online: março 18, 2024
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Total access: 321

Quim. Nova 2024, 47(8), e-20240030, 1-5

 

The powder of Co64Nb30B6 obtained by mechanical alloying

Luciano NascimentoI,*; Ítallo Campos Gonçalves de MoraisI; Adriano Lima da SilvaI, João Baptista da Costa Agra de MeloII; Danyelle Garcia GuedesI; Lincoln Rodrigues Sampaio de AraújoIII; Suédina Maria de Lima SilvaI; Ana Cristina Figueiredo de Melo CostaI


The hysteresis loop displays a typical behavior of ferromagnetic materials, that exhibit soft magnetic properties for Co64Nb30B6 alloy.

http://dx.doi.org/10.21577/0100-4042.20240030

Publicado online: março 18, 2024
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Total access: 297

Quim. Nova 2024, 47(8), e-20240031, 1-9

 

Sequential determination of Zn, Fe, Mg, Ca, Na and K in synthetized babassu fame by high resolution continuum source flame atomic absorption spectrometry

Ana Carla S. BoeiraI; Leandro KollingI; Samuel J. SantosII; Luiz A. M. FontouraII,*; Márcia Messias da SilvaI,III,*


A sequential multi-element method for determination of Zn, Fe, Mg, Ca, Na and K in synthesized babassu FAME by high resolution continuum source flame atomic absorption spectrometry (HR-CS FAAS), using microemulsion as sample preparation, was developed.

http://dx.doi.org/10.21577/0100-4042.20240031

Publicado online: março 18, 2024
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Total access: 341

Quim. Nova 2024, 47(8), e-20240035, 1-10

 

Immobilizing microalgae in hybrid matrices as a green technology for natural gas sweetening using novel static system

Julia da Costa MoraesI; Fabio RoseletII; Leonardo Moreira dos SantosI; Bárbara PolessoI; Sandra EinlofI,*


Microalgae immobilized in hybrid silica/alginate matrices applied for natural gas sweetening process.

http://dx.doi.org/10.21577/0100-4042.20240035

Publicado online: março 20, 2024
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Total access: 333

Quim. Nova 2024, 47(8), e-20240036, 1-7

 

Influência do procedimento de ajuste granulométrico de amostras de cerâmica vermelha agregada com resíduos de rochas ornamentais para classificação conforme critérios da ABNT

Alcione Alves de FreitasI,*; Mirna Aparecida NevesII; Damaris GuimarãesI; Simone Pereira TaguchiIII


The graphical abstract represents the final state of the red ceramic samples produced with clay and ornamental rocks residue, which were crushed and ground for the waste classification test according to the ABNT criteria.

http://dx.doi.org/10.21577/0100-4042.20240036

Publicado online: março 20, 2024
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Total access: 347

Quim. Nova 2024, 47(8), e-20240037, 1-6

 

Microwave assisted lactide-glycolide homo and copolymerization initiated by magnesium lactate

Matheus Alves Coelho; Marcos L. Dias*


Lactide and glycolide homo and copolymers were successfully synthesized by microwave assisted initiation with magnesium lactate.

http://dx.doi.org/10.21577/0100-4042.20240037

Publicado online: abril 4, 2024
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Total access: 278

Quim. Nova 2024, 47(8), e-20240044, 1-7

 

Preparation and application properties of Ti-Si glycol salt catalysts for polyesters

Yang Yu; Guoliang Shen*; Tie jun Xu; Ruiyang Wen; Yong jie Wang; Yue Huo; Shi jie Xu


In this paper, Ti-EG and Si-EG were synthesized and characterized separately, and their catalytic effect in polyester (PET) was also investigated in the case of their co-use.

http://dx.doi.org/10.21577/0100-4042.20240044

Publicado online: abril 16, 2024
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Total access: 245

Quim. Nova 2024, 47(8), e-20240045, 1-10

 

Pré-tratamento e caracterização de placas de circuito impresso de computadores com ênfase no conteúdo metálico

Matheus M. PereiraI,II,*; Rodrigo F. GomesIII; Fabio O. CostaIII; Michael L. M. RodriguesII; Versiane A. LeãoIII


The flowchart elucidates the processing steps performed on the printed circuit boards (PCB). Furthermore, the tests of physical and chemical characterizations showed satisfactory and promising results.

http://dx.doi.org/10.21577/0100-4042.20240045

Publicado online: abril 16, 2024
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Total access: 296

Quim. Nova 2024, 47(8), e-20240047, 1-11

 

Precision design of proton exchange membrane fuel cell flow field based on water and heat transfer mechanism

Liao XiangrongI; Jianbin SuII; Chonlatee PhotongIII,*


The three-dimensional proton exchange membrane fuel cell model is established to explore the influence of flow field precision design on the electrochemical characteristics, water heat transfer characteristics and phase change characteristics of the fuel cell.

http://dx.doi.org/10.21577/0100-4042.20240047

Publicado online: abril 18, 2024
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Total access: 264

Educação Quim. Nova 2024, 47(8), e-20240032, 1-8

 

Modelo de avaliação de aplicativos educacionais: avaliando aplicativos de química orgânica da Google Play®

Vanessa S. de OliveiraI; Bruno S. LeiteII,*


The evaluation model of educational applications is composed of categories that have technical and pedagogical dimensions, aiming to evaluate the applications based on the balance between them.

http://dx.doi.org/10.21577/0100-4042.20240032

Publicado online: março 18, 2024
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Total access: 476

Assuntos Gerais Quim. Nova 2024, 47(8), e-20240038, 1-7

 

A history of carbonic acid and the central role of bicarbonate in the CO2/H2O system

Claudimir Lucio do Lago*


Same fact, two readings: In aqueous media, the transition from CO2 to H2CO3 involves the formation of the bicarbonate ion. Alternatively, the protonation of bicarbonate is regulated by both kinetic and thermodynamic factors.

http://dx.doi.org/10.21577/0100-4042.20240038

Publicado online: abril 5, 2024
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Total access: 328

Quim. Nova 2024, 47(8), e-20240043, 1-3

 

Como os novos resultados de simulação da formação da lua afetam a probabilidade de surgimento de vida em planetas assemelhados à terra

Roberto B. Faria*


Theia's remains were deposited over the proto-Earth when the Moon was formed by the collision of these proto-planets. As consequence, significant amounts of heavier essential elements became available and allowed the evolution of live in the Earth.

http://dx.doi.org/10.21577/0100-4042.20240043

Publicado online: abril 12, 2024
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Total access: 336

Quim. Nova 2024, 47(8), e-20240046, 1-7

 

Desvendando a percepção pública da química: uma análise da literatura acadêmica

Marcela AlvaroI,*; Luisa MassaraniII


When studying the perception of chemistry, some terms are more recurrent, chemistry seems to be the central element, but words like students are also highlighted, giving us clues as to how the perception of this science has been investigated in scientific articles.

http://dx.doi.org/10.21577/0100-4042.20240046

Publicado online: abril 16, 2024
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Total access: 338

On-line version ISSN 1678-7064 Printed version ISSN 0100-4042
Química Nova
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