Adsorção De Cobre Presente Em Solução Aquosa Por Adsorvente De Casca De Laranja Seco E Modificado Com Hcl. / Copper Adsorption Present in Aqueous Solution by Dry Orange Shell Adsorbent and Modified With HCL

Farias, Cíntia Kelly de Lima; Nascimento, Ketyla Karla Rodrigues do; Vieira, Fernando Fernandes; Almeida, Marcello Maia de

doi:10.34117/bjdv6n12-653

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“…It was observed, in the variance analysis, that the regression models obtained excellent adjustment to the experimental data, presenting very expressive determination coefficients, in which the models can explain more than 99% of the variations in the answers. According to [25], a mathematical model can be considered statistically significant if F cal > F tab and predictive if this relationship is greater than 10. So, for the variable Q t with the samples investigated, the model can be considered statistically significant at the 0.05 confidence interval.…”

Section: Experimental Design Of the Factorial Type Of Functionalized ...mentioning

confidence: 99%

“…Among them are nanofiltration, photocatalysis, coagulation/flocculation, membrane filtration, electrochemical methods, and adsorption [14][15][16][17][18][19][20][21][22][23][24]. Adsorption is an excellent technique because it is easy to operate, has adsorbate selectivity, has a good efficiency in removing pollutants, and has adsorbent reusing potential [25,26]. At the moment, some adsorbents (such as carbon nanotubes, activated carbon), despite having high porosity and surface area, usually have increased production and regeneration costs, which can make them economically unfeasible, in addition to being from the burning of natural resources [27].…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of Sodium Diclofenac in Functionalized Palygoskite Clays

et al. 2022

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The effects of acid and organo-functionalizations on the surface of Brazilian palygorskite clay was investigated, evaluating its potential in the adsorptive capacity of the drug sodium diclofenac present in wastewaters. The modifications on the clay structure were investigated by X-ray diffraction, X-ray fluorescence, thermogravimetric, differential thermal analysis, Fourier transform infrared spectroscopy, surface area by N2 adsorption (77.5 K) and Zeta potential. The experimental design was carried out to find the best conditions for the adsorption tests, in which concentration, mass and pH were significant. In the kinetic study, the pseudo-second-order model better described the adsorption process for acid and organo-functionalized samples. Such results indicate that the adsorption behavior probably occurs due to the phenomenon of chemisorption. Regarding the adsorption isotherms, the Langmuir model was the one that best adjusted both the experimental data of acid and the organo-functionalized samples, whose maximum adsorption capacity were 179.88 and 253.34 mg/g, respectively. This model also indicates that the sodium diclofenac is adsorbed to monolayers homogeneously through chemisorption. In general, the studied clays proved to be suitable adsorbents for the removal of sodium diclofenac.

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Section: Experimental Design Of the Factorial Type Of Functionalized ...mentioning

confidence: 99%