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
The objective of this work is to study the efficiency of some surface modified phyllosilicate minerals （bentonite and glauconite） in the removal of dyes from textile waste water. It is found that complete dye remova...The objective of this work is to study the efficiency of some surface modified phyllosilicate minerals （bentonite and glauconite） in the removal of dyes from textile waste water. It is found that complete dye removal was achieved by using 10-25g modified glauconite from solutions having a dye concentration of 10-50 mg/L. Adsorption data were modeled using Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherms. Adsorption capacities and optimum adsorption isotherms were predicted by linear regression method. The analysis of experimental isotherms showed that Langmuir isotherm reasonably fit the experimental data in the studied concentration range for the adsorption of dye onto glauconite mineral surface where Freundlich isotherm fit the experimental data for the adsorption of dve onto bentonite mineral surface.展开更多
In this paper morphology of APP modified bitumen (APP MB) and SBS modified bitumen (SBS MB) was studied by scanning elecron microscopy (SEM) and the morphology property relationship of these two modified bitumen (MB) ...In this paper morphology of APP modified bitumen (APP MB) and SBS modified bitumen (SBS MB) was studied by scanning elecron microscopy (SEM) and the morphology property relationship of these two modified bitumen (MB) was discussed. The results indicate that the APP MB systems is in a homogeneous phase structure and the SBS MB system is in a heterogeneous phase structure. Improvement of bituminous physical properties by APP and SBS is closely related with the microstructure of APP and SBS MB.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The objective of this work is to study the efficiency of some surface modified phyllosilicate minerals （bentonite and glauconite） in the removal of dyes from textile waste water. It is found that complete dye removal was achieved by using 10-25g modified glauconite from solutions having a dye concentration of 10-50 mg/L. Adsorption data were modeled using Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherms. Adsorption capacities and optimum adsorption isotherms were predicted by linear regression method. The analysis of experimental isotherms showed that Langmuir isotherm reasonably fit the experimental data in the studied concentration range for the adsorption of dye onto glauconite mineral surface where Freundlich isotherm fit the experimental data for the adsorption of dve onto bentonite mineral surface.
文摘In this paper morphology of APP modified bitumen (APP MB) and SBS modified bitumen (SBS MB) was studied by scanning elecron microscopy (SEM) and the morphology property relationship of these two modified bitumen (MB) was discussed. The results indicate that the APP MB systems is in a homogeneous phase structure and the SBS MB system is in a heterogeneous phase structure. Improvement of bituminous physical properties by APP and SBS is closely related with the microstructure of APP and SBS MB.
