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Brazilian natural fiber (jute) as raw material for activated carbon production Anais da ABC (AABC)
ROMBALDO,CARLA F.S.; LISBOA,ANTONIO C.L.; MENDEZ,MANOEL O.A.; COUTINHO,APARECIDO R..
Jute fiber is the second most common natural cellulose fiber worldwide, especially in recent years, due to its excellent physical, chemical and structural properties. The objective of this paper was to investigate: the thermal degradation of in natura jute fiber, and the production and characterization of the generated activated carbon. The production consisted of carbonization of the jute fiber and activation with steam. During the activation step the amorphous carbon produced in the initial carbonization step reacted with oxidizing gas, forming new pores and opening closed pores, which enhanced the adsorptive capacity of the activated carbon. N2 gas adsorption at 77K was used in order to evaluate the effect of the carbonization and activation steps. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Activation; Adsorption; Carbonization; Jute fiber; Thermogravimetry.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000402137
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Crystal-chemistry of interstratified Mg/Fe-clay minerals from seafloor hydrothermal sites ArchiMer
Cuadros, Javier; Michalski, Joseph R.; Dekov, Vesselin; Bishop, Janice; Fiore, Saverio; Dyar, M. Darby.
Seafloor hydrothermal sites generate abundant Mg- and Fe-rich clays. These clays are structurally and compositionally interesting because these environments are characterized by large, dynamic temperature and chemical gradients in their deposition environment, which promote the formation of chemically and structurally complex clays, including interstratified phases. The system is also interesting as a proxy for the study of the large Mg- and Fe-rich phyllosilicate deposits on Mars, which are broadly characterized as smectitic clay of hydrothermal, volcanic or sedimentary origin. Thirty submarine samples and four terrestrial ones, for comparison, were studied by means of X-ray diffraction (XRD), thermogravimetry (TG), mid-IR and Mössbauer spectroscopies and...
Tipo: Text Palavras-chave: Interstratified clays; Martian clays; Submarine hydrothermal sites; Thermogravimetry; XRD.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00160/27131/25329.pdf
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Gravimetric determination of soil organic matter BABT
Miyazawa,M.; Pavan,M.A.; Oliveira,E.L. de; Ionashiro,M.; Silva,A.K..
Studies were carried out to evaluate a gravimetric method for the determination of soil organic matter by the mass loss at 300ºC. The gravimetric method was compared with Walkley-Black, using several brazilian soils with variable chemical and physical properties. Gravimetric method was positively correlated with Walkley-Black method with the following linear regression equation: y = 3.72x + 0.29, r = 0.94. The angular coefficient 3.72 for tropical soils was greater than those reported in the literature for temperate soils (from 1.68 to 2.13). The difference was due to greater oxidation degree of the organic matter. When compared with Walkley-Black method, gravimetric technique showed certain distinct advantages such as no environmental contamination with...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Organic carbon; Thermogravimetry; Soil analysis.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000500005
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Tacinga inamoena vegetal drug characterization using phytochemistry, pharmacopoeial methods and thermoanalytical techniques BJPS
Silva,Joanda Paolla Raimundo e; Reis,Malu Maria Lucas dos; Santana,Cleildo Pereira; Medeiros,Ana Cláudia Dantas de; Alves,Harley da Silva.
Tacinga inamoena (K. Schum.) N.P. Taylor & Stuppy, also known as quipá, is a native cactus of the Caatinga used in traditional medicine to treat urethral infections and inflammation. This study aimed to determine the physicochemical characteristics of vegetal drug obtained from the roots of T. inamoena. Analytical techniques and phytochemical tests were used, such as thermal analysis, qualitative and semiquantitative determination of secondary metabolites and spectroscopy at the infrared region. The powder of the vegetal drug met the parameters established by the Brazilian Pharmacopoeia, except for compressibility, which was low. On the thermogravimetric curve, three events related to the mass loss were verified, which correlate with the vegetal drug...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cactaceae; Quality control; Herbal medicine; Secondary metabolites; Thermogravimetry.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502020000100602
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Thermal and spectroscopic analyses on the molecular interaction between eucalyptus kraft pulp components and offset printing inks BABT
Alves,Ericka Figueiredo; Oliveira,Rubens Chaves de; Silva,Luis Henrique Mendes da; Colodette,Jorge Luiz.
Thermal and infrared spectroscopic analyzes were carried out in order to study the kind of interaction between the anatomical components of the bleached eucalyptus kraft pulp with offset inks. A Bauer-McNett fiber classifier was used in order to obtain the anatomical components of the pulp, separately. The determinations of the enthalpy of the processes occurring in the samples of inks and pulp, as well as the enthalpy of these components interactions were obtained by Differential Scanning Calorimetry. In the interaction between pulp and offset ink, the reduced enthalpy values of the endothermic peak were interpreted as due to the released energy for adhesion of the ink pigment to the substratum. The low enthalpy value, 58 to 121 cal.g -, ¹indicated that...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Differential scanning calorimetry; Thermogravimetry; Kraft pulping; Cellulose; Interaction; Eucalyptus sp.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000300021
Registros recuperados: 5
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