H＋-rectorite clay,which was prepared by modifying the raw rectorite with 10% hydrochloric acid at 60 °C for 24 h,was used as an absorbent for removal of methyl blue （MB） from aqueous solutions.The morphology a...H＋-rectorite clay,which was prepared by modifying the raw rectorite with 10% hydrochloric acid at 60 °C for 24 h,was used as an absorbent for removal of methyl blue （MB） from aqueous solutions.The morphology and the structure and crystallinity of the pristine rectorite and the H＋-rectorite were characterized by scanning electron microscopy （SEM） technique and X-ray diffraction （XRD） technique,respectively.The results showed that the H＋-rectorite exhibited high adsorption ability than the raw rectorite,and it was found that the removal percentage of MB increased with increasing in adsorbents dose,whereas the adsorption amount qe （mg/g） decreased.The equilibrium was attained within 30 min in adsorption process,and the maximum adsorption capacity of H＋-rectorite for methylene blue reached as high as 37 mg/g.Besides,the effect of temperature on the adsorption of MB with H＋-rectorite was investigated and the equilibrium data were well fitted to Freundlich equations.The H＋-rectorite absorbent saturated with MB can be regenerated by calcinating at 400 °C for 2 h and the regenerated absorbent still showed higher percentage removal of MB.展开更多
采用HDTMA(十六烷基三甲基溴化铵)对累托石原土进行有机覆盖改性,考察了HDTMA改性累托石对水中染料酸性橙Ⅱ的吸附热力学和动力学。结果表明,与累托石原土相比,HDTMA改性累托石对水中酸性橙Ⅱ的吸附效率显著提高。在最适吸附条件下,HDTM...采用HDTMA(十六烷基三甲基溴化铵)对累托石原土进行有机覆盖改性,考察了HDTMA改性累托石对水中染料酸性橙Ⅱ的吸附热力学和动力学。结果表明,与累托石原土相比,HDTMA改性累托石对水中酸性橙Ⅱ的吸附效率显著提高。在最适吸附条件下,HDTMA改性累托石对水中酸性橙Ⅱ的吸附经过60 m in可达平衡。等温吸附规律可用Freun-d lich模式较好地模拟。吸附热小于零,吸附是放热反应。吸附动力学规律遵循Bangham模式,内扩散过程是吸附速度的控制步骤。展开更多
基金Funded by the National Key Technology R&D Program of China (Nos.2006BAJ08B10-04 and 2008BAJ08B13-04)
文摘H＋-rectorite clay,which was prepared by modifying the raw rectorite with 10% hydrochloric acid at 60 °C for 24 h,was used as an absorbent for removal of methyl blue （MB） from aqueous solutions.The morphology and the structure and crystallinity of the pristine rectorite and the H＋-rectorite were characterized by scanning electron microscopy （SEM） technique and X-ray diffraction （XRD） technique,respectively.The results showed that the H＋-rectorite exhibited high adsorption ability than the raw rectorite,and it was found that the removal percentage of MB increased with increasing in adsorbents dose,whereas the adsorption amount qe （mg/g） decreased.The equilibrium was attained within 30 min in adsorption process,and the maximum adsorption capacity of H＋-rectorite for methylene blue reached as high as 37 mg/g.Besides,the effect of temperature on the adsorption of MB with H＋-rectorite was investigated and the equilibrium data were well fitted to Freundlich equations.The H＋-rectorite absorbent saturated with MB can be regenerated by calcinating at 400 °C for 2 h and the regenerated absorbent still showed higher percentage removal of MB.
文摘采用HDTMA(十六烷基三甲基溴化铵)对累托石原土进行有机覆盖改性,考察了HDTMA改性累托石对水中染料酸性橙Ⅱ的吸附热力学和动力学。结果表明,与累托石原土相比,HDTMA改性累托石对水中酸性橙Ⅱ的吸附效率显著提高。在最适吸附条件下,HDTMA改性累托石对水中酸性橙Ⅱ的吸附经过60 m in可达平衡。等温吸附规律可用Freun-d lich模式较好地模拟。吸附热小于零,吸附是放热反应。吸附动力学规律遵循Bangham模式,内扩散过程是吸附速度的控制步骤。
