جستجوی مقالات مرتبط با کلیدواژه "مونت موریلونیت سبز" در نشریات گروه "پزشکی"

Nitrate is used as a chemical water quality indicator. Therefore, nitrate removal from contaminated water is considered as an important health and environment issue. The aim of this work was investigation of nitrate adsorption from aqueous solution by Local Green Montmorillonite (LGM) as a novel adsorbent.
This study was conducted in a laboratory batch reactor. The most important variables affecting adsorption process were investigated and adsorption kinetic and isotherms were determined. Spectrophotometer was used for nitrate measurement and adsorbent characteristics were determined by BET, SEM and FTIR examimations. Data analysis was performed by excel software.
The results showed the optimum pH=1.5 and nitrate adsorption increased by increasing contact time and adsorbent dosage. The adsorbent specific surface area of 13m2/g was obtained and FTIR test revealed the functional groups existing on adsorbent surface to have important role in nitrate adsorption. Experimental data was well fitted by pseudo second-order kinetic model. Langmuir isotherm model best represented the experimental data to describe adsorption process and the maximum nitrate adsorption capacity was 89 mg/g.
Overall, data showed that the Local Green Montmorillonite can efficiently remove nitrate from aqueous solution.

Because of the disadvantages of antibiotics in the ecosystem, it must remove before discharging wastewater containing them into the environment by an effective process. The aim of this study was cephalexin removal by local green montmorillonite loaded with TiO2 nanoparticles (TiO2/GLM) in the presence of potassium permanganate.
This experimental study was performed in batch. In this study, green montmorillonite found in the area of Ardabil sarcham used as base absorbent and to improve the efficiency of cephalexin removal stabilized TiO2 nanoparticles on it using potassium permanganate. Then, the most important variables affecting the process have been investigated. Scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR) tests used to investigate absorbent surface morphology and functional groups on the adsorbent respectively. The samples were analyzed by a spectrophotometer and data analysis was performed using Excel software.
SEM images showed that the absorbent surface has a high roughness and FTIR test showed change the functional groups because loading of TiO2 nanoparticles.the optimal condition was pH = 5, detention time= 60 min and adsorbent dose = 4 g/l for initial Cephalexin concentration of 25 mg/l. Also the results showed by decreasing temperature, removal efficiency was increased.
Due to the high efficiency of TiO2/GLM in the absorption of cephalexin as well as its morphology did not change after adsorption process, we can say that this adsorbent can be used as a cheap and efficient absorbent for the removal of cephalexin used