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Isotherm, kinetic, and thermodynamic studies on Hg(II) adsorption from aqueous solution by silica- multiwall carbon nanotubes

Saleh, Tawfik A.

Environmental science and pollution research international, 2015-11, Vol.22 (21), p.16721-16731 [Periódico revisado por pares]

Berlin/Heidelberg: Springer Berlin Heidelberg

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Título:
Isotherm, kinetic, and thermodynamic studies on Hg(II) adsorption from aqueous solution by silica- multiwall carbon nanotubes
Autor: Saleh, Tawfik A.
Assuntos: Activated carbon ; Adsorbents ; Adsorption ; Aquatic Pollution ; Aqueous solutions ; Atmospheric Protection/Air Quality Control/Air Pollution ; Diffusion ; Earth and Environmental Science ; Ecotoxicology ; Environment ; Environmental Chemistry ; Environmental Health ; Environmental Pollutants - chemistry ; Environmental Pollutants - isolation & purification ; Environmental science ; Equilibrium ; Industrial wastes ; Investigations ; Kinetics ; Mechanical properties ; Mercury ; Mercury - chemistry ; Mercury - isolation & purification ; Morphology ; Nanoparticles ; Nanotubes, Carbon - chemistry ; Pollutants ; Research Article ; Silicon Dioxide - chemistry ; Solutions ; Studies ; Temperature ; Waste Water - chemistry ; Waste Water Technology ; Water - chemistry ; Water Management ; Water Pollution Control ; Water treatment
É parte de: Environmental science and pollution research international, 2015-11, Vol.22 (21), p.16721-16731
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: Silica combined with 2 % multiwall carbon nanotubes (SiO 2 -CNT) was synthesized and characterized. Its sorption efficacy was investigated for the Hg(II) removal from an aqueous solution. The effect of pH on the percentage removal by the prepared material was examined in the range from 3 to 7. The adsorption kinetics were well fitted by using a pseudo-second-order model at various initial Hg(II) concentrations with R 2 of >0.99. The experimental data were plotted using the interparticle diffusion model, which indicated that the interparticle diffusion is not the only rate-limiting step. The data is well described by the Freundlich isotherm equation. The activation energy (Ea) for adsorption was 12.7 kJ mol −1 , indicating the process is to be physisorption. Consistent with an endothermic process, an increase in the temperature resulted in increasing mercury removal with a ∆H o of 13.3 kJ/mol and a ∆S o 67.5 J/mol K. The experimental results demonstrate that the combining of silica and nanotubes is a promising alternative material, which can be used to remove the mercury from wastewaters.
Editor: Berlin/Heidelberg: Springer Berlin Heidelberg
Idioma: Inglês

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Isotherm, kinetic, and thermodynamic studies on Hg(II) adsorption from aqueous solution by silica- multiwall carbon nanotubes

Saleh, Tawfik A.

Berlin/Heidelberg: Springer Berlin Heidelberg

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