Adsorption of hydrogen sulphide from aqueous solutions using modified nano/micro fibrillated cellulose
2014
Hokkanen, Sanna | Repo, Eveliina | Bhatnagar, Amit | Tang, Walter Zhonghong | Sillanpää, Mika
In the present study, microfibrillated cellulose (MFC) was modified by aminopropyltriethoxysilane (APS), hydroxy-carbonated apatite (HAP), or epoxy in order to produce novel nanostructured adsorbents for the removal of hydrogen sulphide (H ₂S) from the aqueous solutions. Structural properties of the modified MFC materials were examined using a scanning electron microscope, Fourier transform infrared spectroscopy and acid/base titration. These methods were used to verify the presence of nanostructures on the adsorbents surfaces as well as functionalities suitable for H ₂S adsorption. Adsorption of H ₂S by prepared adsorbents was investigated in batch mode under different experimental conditions, i.e. varying pH and H ₂S concentrations. H ₂S uptake was found to be 103.95, 13.38 and 12.73 mg/g by APS/MFC, HAP/MFC and epoxy/MFC, respectively from 80 mg/L H ₂S solution. The equilibrium data were best described by the Langmuir isotherm for HAP/MFC and APS/MFC and the Sips isotherm for epoxy/MFC.
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