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Kinetic and isotherm analysis of Cu(II) adsorption onto almond shell (Prunus Dulcis)

Yildiz S.

Ecological Chemistry and Engineering. S

2017

Vol. 24, nr 1

87--106

In the work, adsorption of Cu2+ ions onto almond shell were investigated under different operational conditions. Almond shell was used without any pretreatment prior to the tests. The optimum conditions for adsorption of Cu2+ ions through almond shell were determined to be; pH 5.0, temperature 20°C, shaking rate 125 rpm, sorbent dose 0.3 g and initial Cu2+ ion concentration 50 mg/dm3. The equilibrium duration of the system was 60 minutes. The sorption capacities of the sorbents were predicted with the aid of equilibrium and kinetic models. The interactions of peanut shell with metal ions were constituted by SEM, EDX, FT-IR, XRD and AFM. The pseudo-first-order, pseudo-second-order, Weber-Morris, Elovich model and Bangham kinetic models were applied to test the experimental data. The Cu+2 ions adsorption onto almond shell was better defined by the pseudo-second-order kinetic model, for initial pH. The equilibrium data were evaluated using Langmuir, Freundlich, Temkin, D-R and Harkins Jura isotherms. The highest R2 value in isotherm studies was obtained from Langmiur isotherm (R2 = 0.98) for the inlet concentration.

Szybka wielowariantowa analiza izoterm adsorpcji ditlenku węgla i metanu

Kwiatkowski M., Duda J. T.

Przemysł Chemiczny

2014

T. 93, nr 6

878-881

Przedstawiono wyniki analiz komputerowych pojedynczych, podwójnych i poczwórnej izotermy adsorpcji ditlenku węgla i metanu na węglu aktywnym Norit RB2 wyznaczonych w dwóch temperaturach. W obliczeniach wykorzystano szybką wielowariantową metodę dopasowywania modeli teoretycznych klasy LBET do danych empirycznych.

New adsorption models with the fast multivariant procedure for fitting the theor. LBET models to the empirical data were used as a tool to anal. of the microporous structure of the Norit RB2 active C on the basis high-temp. multiple adsorption isotherms. The used fast multivariant identification procedure of adsorption systems was found very useful in describing microporous structures of carbonaceous materials.