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Removal of Acid Orange 7 Dye from Synthetic Textile Wastewater by Single-Walled Carbon Nanotubes: Adsorption Studies, Isotherms and Kinetics
S.p. Moussavi, M.m. Emamjomeh, M.h. Ehrampoush, M. Dehvari, S. Jamshidi,
Volume 12, Issue 11 (2-2014)
Abstract

  Background and Objective: Colors can cause major environmental pollutions and are responsible for the carcinogenic and mutagenic risks. In this study, single-walled carbon nanotubes have been carried out to determine the efficiency of removal of Acid Orange 7 ( AO7 ) dye from synthetic textile wastewater.

  Materials and Methods : In the laboratory study , the color was determined in 484 nm using spectrophotometer. Batch flow laboratory study was designed to investigate the effects of the different parameters including adsorbent dose (0.05 to 0.4 g/ l ), contact time (30 to 180 minutes ), the initial concentration of the dye (25 , 50, 75 and 100 mg/l ), pH (3 to 11) and mixing intensity (40, 60 , 80, 100 and 120 rpm) on the dye removal efficiency by single-walled carbon nanotubes. All sample test s were repeated three times and then, in order to compare the effect of different parameters , the collected data was analyzed by one-way ANOVA test.

  Results : The results showed that the dye removal efficiency could be increased when the different parameters including adsorbent dose , contact time and mixing intensity are increased in this process. The results also showed that the decolourization of dye solution is inversely related to the initial dye concentration and the pH solution. The maximum dye removal efficiency was obtained while the adsorbent dose and pH were found to be 0.3 g and 3, respectively. Time of color removal was obtained by 180 min in equilibrium. AO7 adsorption isotherm follows Langmuir model (R2= 99.4%) , and the pseudo second-order kinetics.

  Conclusion : The results showed that the single-walled carbon nanotubes are effective adsorbents for the dye removal from textile wastewater , especially AO7 dye.

  Key words : Acid Orange 7 dye removal , Single-walled carbon nanotubes, Adsorption, Isotherms and kinetics, Textile

 

  Funding : This study was funded by research deputy of Yazd University of Medical Sciences.

  Conflict of interest : None declared.

  Ethical approval : The Ethics Committee of Yazd University of Medical Sciences approval the study. .

  

 How to cite this article : Moussavi SP, Emamjomeh MM , Ehrampoush MH . Removal of Acid Orange 7 dye from synthetic textile wastewater by single-walled carbon nanotubes : adsorption studies , isotherms and kinetics . J Rafsanjan Univ Med Sci 2014 12(11): 907-18. [Farsi]

 


Identification and Quantification of the Environmental Health Indicators of Hospital Kitchens in Qazvin in 2022: A Descriptive Study
Saeid Soleymani, Mahdi Ranjbaran, Hamzeh Ali Jamali, Mohammad Mahdi Emamjomeh,
Volume 21, Issue 11 (2-2023)
Abstract
Background and Objectives: Hospital foodservices are fundamental to the care provided to patients throughout their healing processes. Therefore, this study was designed to identify and evaluate the environmental health indicators in hospital kitchens in Qazvin.
Materials and Methods: This descriptive study was conducted in five different government hospitals, two private hospitals, and the Social Security Hospital of Qazvin in 2022. Data were collected by a standard structured checklist followed by observing, interviewing, and using available documents. Also, the study included 70 available food service staff that completed a standard questionnaire to assess their food safety KAP (knowledge, attitude, performance). Data were analyzed using independent t-test, one-way ANOVA, Spearman’s correlation coefficient, and non-parametric Wilcoxon test.
Results: In terms of environmental health indicators, 50% of kitchens were in good condition, 25% in average condition, and 25% in poor condition. A significant positive correlation was found between the number of employees and the status of environmental health indicators (rs=0.982, p<0.001). Moreover, only 14.3% of personnel of kitchens (10 subjects) had good food safety knowledge. Knowledge was significantly associated with work experience and level of health education (p<0.05).
Conclusion: It has been observed that the knowledge of the staff on hygiene and food safety is low, and kitchens are in average condition in terms of environmental health indicators. So, it is suggested to have more interventional training, control, and surveillance.
Key words: Environmental health indicators, Hospital food services, Staff, Questionnaire, Qazvin

Funding: This study did not have any funds.
Conflict of interest: None declared.
Ethical approval: The Ethics Committee of Qazvin University of Medical Sciences approved the study (IR.QUMS.REC.1400.505).

How to cite this article: Soleymani Saeid, Ranjbaran Mahdi, Jamali Hamzeh Ali, Emamjomeh Mohammad Mahdi. Identification and Quantification of the Environmental Health Indicators of Hospital Kitchens in Qazvin in 2022: A Descriptive Study. J Rafsanjan Univ Med Sci 2023; 21 (11): 1153-1170. [Farsi]
 
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