Mongolian sheep wool was modified by maleic anhydride at different temperatures to obtain new adsorbent for the removal of Cr(III). Adsorption of Cr(III) from aqueous solution onto the modified wool was investigated i...Mongolian sheep wool was modified by maleic anhydride at different temperatures to obtain new adsorbent for the removal of Cr(III). Adsorption of Cr(III) from aqueous solution onto the modified wool was investigated in batch system. In this work, the effect of various parameters such as pH, contact time, temperature and initial concentration on the adsorption capacity was determined by ICP-OES (Inductively Coupled Plasma-Optical Emission Spectrometry). Modified wool was characterized by SEM (scanning electron microscopy) and FT-IR (Fourier transform infrared spectrometer). The thermodynamic and kinetic studies were carried out and the results confirmed that the adsorption process was spontaneous in nature, thermodynamically favourable and endothermic. Kinetically, the adsorption process obeys the pseudo-second order model. The modified wool can be an effective adsorbent for the removal of Cr(III) from aqueous solution.展开更多
This study is to prepare chitosan beads modified with sodium dodecyl sulfate (SDS) to effectively remove Cr(III) from an aqueous solution. The characterizations of SDS-chitosan by scanning electron microscopy-energy d...This study is to prepare chitosan beads modified with sodium dodecyl sulfate (SDS) to effectively remove Cr(III) from an aqueous solution. The characterizations of SDS-chitosan by scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), Fourier transform-infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) proved the successful synthesis of the adsorbent. The adsorption of Cr(III) on the SDS material was investigated by varying experimental conditions such as pH, contact time and adsorbent dosage. The maximum adsorption capacity of SDS-chitosan for Cr(III) was estimated to be 3.42 mg?g<sup>-1</sup>. The results of adsorption kinetics and isothermal models show that the adsorption process conforms to the pseudo-second-order and Langmuir isotherm models, indicating that the adsorption is single-layer chemical adsorption. Thermodynamic analyses indicate that the adsorption of Cr(III) is an endothermic reaction. These results show that the new adsorbent has obvious application prospect to eliminate Cr(III).展开更多
文摘Mongolian sheep wool was modified by maleic anhydride at different temperatures to obtain new adsorbent for the removal of Cr(III). Adsorption of Cr(III) from aqueous solution onto the modified wool was investigated in batch system. In this work, the effect of various parameters such as pH, contact time, temperature and initial concentration on the adsorption capacity was determined by ICP-OES (Inductively Coupled Plasma-Optical Emission Spectrometry). Modified wool was characterized by SEM (scanning electron microscopy) and FT-IR (Fourier transform infrared spectrometer). The thermodynamic and kinetic studies were carried out and the results confirmed that the adsorption process was spontaneous in nature, thermodynamically favourable and endothermic. Kinetically, the adsorption process obeys the pseudo-second order model. The modified wool can be an effective adsorbent for the removal of Cr(III) from aqueous solution.
文摘This study is to prepare chitosan beads modified with sodium dodecyl sulfate (SDS) to effectively remove Cr(III) from an aqueous solution. The characterizations of SDS-chitosan by scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), Fourier transform-infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) proved the successful synthesis of the adsorbent. The adsorption of Cr(III) on the SDS material was investigated by varying experimental conditions such as pH, contact time and adsorbent dosage. The maximum adsorption capacity of SDS-chitosan for Cr(III) was estimated to be 3.42 mg?g<sup>-1</sup>. The results of adsorption kinetics and isothermal models show that the adsorption process conforms to the pseudo-second-order and Langmuir isotherm models, indicating that the adsorption is single-layer chemical adsorption. Thermodynamic analyses indicate that the adsorption of Cr(III) is an endothermic reaction. These results show that the new adsorbent has obvious application prospect to eliminate Cr(III).
