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- W2912368163 abstract "The adsorption of annatto dye was analysed using kaolin clay as the adsorbent. In this work, the influence of the adsorbent particle size, agitation (0 and 100 rpm), temperature (25, 40, and 60°C), and salt presence (sodium chloride and sodium sulphate at 1, 2 and 3 wt%) on the adsorption process was studied. The adsorption increased 14.21% for particles smaller than 45 µm and the agitation (100 rpm) led to an increase of 22.41% compared to the system without agitation. The ΔG° (237.711 kJmol-1) indicated that the adsorption process was spontaneous. The negative value of ΔS° (-408.999 Jmol-1K-1) and ΔH° (-115.829 kJmol-1) showed an exothermic physisorption process. The adsorption kinetics follows the pseudo-second-order model. In the adsorption equilibrium, the tested models provided good correlation coefficients ranging from 0.744 to 0.999 with the best fit observed for the Langmuir model. The maximum adsorption capacity of the kaolin clay for the annatto dye was obtained at 25°C with 1% of sodium sulphate (qmax = 59.88 mgg-1)." @default.
- W2912368163 created "2019-02-21" @default.
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- W2912368163 date "2019-02-14" @default.
- W2912368163 modified "2023-10-01" @default.
- W2912368163 title "Adsorption of natural annatto dye by kaolin: kinetic and equilibrium" @default.
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- W2912368163 doi "https://doi.org/10.1080/09593330.2019.1578418" @default.
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