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Acidic content in wastewaters poses greater difficulty in lead removal from most adsorbents as their removal efficiency significantly decreases in acidic media. Nano-nickel coated carbon (Ni/C), compared with uncoated carbon (C), has shown a much enhanced (almost 80% higher) tendency of Pb(II) removal from solutions having different acid concentrations. All of the characterization results show the creation of more active sites and functional groups on Ni/C. The pertinent kinetic models and thermodynamics of Pb(II) adsorption have demonstrated much improved efficiency by Ni/C. Various isotherms subjected to the sorption data revealed significant increase in the sorption capacities for Ni/C. The adsorption (evidently chemisorption) kinetics are best represented by a pseudo-second-order equation. The adsorption rates in acidic solutions were much higher for Ni/C. The temperature-dependent study enabled thermodynamic parameters to be worked out for C and Ni/C; for C the values are Δ
19.4 ± 0.5 kJ·mol, Δ
76.1 ± 2.1 J·mol·K, Δ
-0.37 ± 0.01 kJ·mol while for Ni/C the values are Δ
30 ± 1 kJ·mol, Δ
114 ± 4 J·mol·K, Δ
-4.56 ± 0.02 kJ·mol. Both cases indicate endothermic, spontaneous and entropy-driven processes.
This article was published in the following journal.
Name: Water science and technology : a journal of the International Association on Water Pollution Research
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FATTY ACIDS in which the carbon chain contains one or more double or triple carbon-carbon bonds.
A group of fatty acids that contain 18 carbon atoms and a double bond at the omega 9 carbon.
Inorganic acids with a non metal, other than carbon, attached to hydrogen, or an acid radical containing no carbon.